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Instruction Book

M-2001B

Tapchanger Control


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M-2001B Digital Tapchanger Control

Features

Bandcenter: Adjustable from 100 V to 135 V in 0.1 V increments.

Bandwidth: Adjustable from 1 V to 6 V in 0.1 V increments.

Line Drop Compensation: R and X compensation. Adjustable from –24 V to +24 V in 1 V increments.Z compensation available with adjustment of voltage raise from 0 V to +24 V, in increments of 1 V.

Time Delay: Definite; adjustable from 1 second to 120 seconds, in 1 second increments. Inverse; adjustablefrom 1 second to 120 seconds, in 1 second increments.

InterTap Time Delay: Used to introduce time delay between tap operations when control is in sequential mode;adjustable from 0 to 60 seconds in 1.0 second increments. Counter input required.

Selectable Outputs: Continuous or pulsed. Normally, an output (raise or lower) signal is maintained when thevoltage remains outside the band. A pulsed output is programmable from 0.2 to 12 seconds, in increments of 0.1second.

Reverse Power Operation:

Transformer LTC Application: Can be set to ignore, block, regulate rev, or return to neutral operation with reversepower.

Single-Phase Regulators : If "keep track" tap position indication is applicable, unit may be set to "Return toNeutral" or "Regulate Reverse". The Regulate Reverse feature allows separate setpoints and regulation in thereverse direction without the installation of source-side VTs.

CT to VT Phasing Correction: Adjustable from 0° to +330° in 30° increments.

Real-Time Metering: The following measured and calculated values are available in real-time:

• Local Voltage

• Load kVA, or MVA

• Load Center Voltage

• Load kW, or MW

• Line Current

• Load kVAr, or MVAr

• Power Factor

• Line Frequency

Demand Metering: Time interval selected as 15, 30, or 60 minutes.

Drag Hands Operation:

The following “drag-hand” values are stored with date and time stamping and are averaged over 32 seconds:

• Minimum Local Voltage

• Maximum Local Voltage

The following “drag-hand” values are stored with date and time stamping and are calculated over the demandtime interval (15, 30, or 60 minutes) as selected by the user:

• Maximum Primary Line Current

• Maximum Load kW, or MW

• Maximum Load kVAr, or MVAr

• Maximum Load kVA, or MVA (and Power Factor at time of Maximum Load kVA, or MVA)

Line Overcurrent Tapchange Inhibit: Adjustable from 200 mA to 640 mA of line current for 200 mA CT or 1.0A to 3.2 A for 1 A CT display and 5.0 A to 16.0 A for 5 A CT display. External auxiliary CT required for 1.0 A and5 A CT inputs.

Voltage Limits, Tap Position Limits, and Runback : Overvoltage and Undervoltage limits are independentlyadjustable from 95 V to 135 V in 0.1 V increments. Upper and lower tap position limits may be set by user, withtap position knowledge active. An adjustable deadband (above the overvoltage limit) of 1 V to 4 V is available,which can be used to set the runback limit.

Voltage Reduction: Three independent steps, each adjustable from 0% to 10% in 0.1% increments of thebandcenter setpoint.


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External Inhibit of Auto Tapchange: Blocks automatic tapchanger operation in response to external contactclosure.

Sequential or Non-Sequential Operation: Non-sequential operation resets the time delay upon momentaryexternal contact closure at the non-sequential input.

Paralleling Methods:

Circulating Current: The circulating current method is standard, and may be implemented using separatebalancing equipment such as the Beckwith Electric M-0115A Parallel Balancing Module or with external

master-follower circuitry.

∆∆∆∆∆VAR™: When specified, the ∆VAR1 method may be implemented by using separate balancing equipment suchas the M-0115A Balancing Module. The ∆VAR2 method does not require the use of the M-0115A BalancingModule.

For all methods of paralleling except ∆VAR2, overcurrent protection, such as that provided by the M-0127Overcurrent Relay, is recommended.

VT Ratio Correction: VT correction from –15 V to +15 V in 0.1 V increments.

Self-Test Alarm Output Contacts: Alerts operator to loss of power or malfunction of control.

User-Programmable Alarm Contacts: Alerts operator to one or more of the following system conditions:Communications Block Invoked, Block Raise Voltage Limit Exceeded, Block Lower Voltage Limit Exceeded,Voltage Reduction (any step) Invoked, Reverse Power Flow Condition Detected, Line Current Limit Exceeded,

Tap Block Raise in Effect, and Tap Block Lower in Effect.Tap Position KnowledgeTransformer LTC : The optional M-2025B Current Loop Interface Module receives a signal from a positiontransducer and outputs to the M-2001B through a bottom port.

Single-Phase Regulators : In most applications, tap position information can be maintained by means of aninternal "keep track" logic.

Operations Counter: A software counter increments by one or two counts (user-selected) per close/open camswitch operation, and may be preset by the user.

Resettable Operations Counter: A second software counter, similar to the operations counter, which may bereset by the user.

Harmonic Analysis: Provides the total harmonic distortion and the harmonic content of the load voltage and

current up to the 31st harmonic (using TapTalk with BECO 2200 protocol).Tap Position Record: Provides a record of the number of times each tap position has been passed through(using TapTalk with BECO 2200 protocol). The tap position record can be reset by the user.

AUTO/OFF/MANUAL Switch Status: Provides the user feedback on the position of the Auto/Off/Manual switch.When the M-2001B is configured for a switch status input, the switch status is read using the seal-in input on thecontrol.

Inputs

Control Voltage Input: Nominal 120 V ac, 60 Hz (50 Hz optional); operates properly from 90 V ac to 140 V ac.If set at 60 Hz, the operating system frequency is from 55 to 65 Hz; if set at 50 Hz, the operating systemfrequency is from 45 to 55 Hz. The burden imposed on the input is 8 VA or less. The unit should be poweredfrom a voltage transformer connected at the controlled voltage bus. The unit will withstand twice the voltage

input for one second and four times the voltage input for one cycle.

Motor Power Input: Nominal 120 V ac to 240 V ac, at up to 6 A as required by the load, with no wiring changesrequired.

Line Current Input: Line drop compensation is provided by a current transformer input with a 0.2 A full scalerating. A Beckwith Electric model M-0121 (5 A to 0.2 A) or M-0169 (5 A or 8.66 A to 0.2 A) Auxiliary CurrentTransformer is available when required. The burden imposed on the current source is 0.03 VA or less at200 mA. The input will withstand 400 mA for two hours and 4 A for 1 second.

Circulating Current Input: Parallel operation of regulators or transformers is accommodated by a currenttransformer input with a 0.2 A full scale rating. The burden imposed on the current source is 0.03 VA or less at200 mA. The input will withstand 400 mA for two hours and 4 A for 1 second.


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Outputs

Raise Output: capable of switching 6 A at 120 Vac to 240 V ac motor power.

Lower Output: capable of switching 6 A at 120 Vac to 240 V ac motor power.

Front Panel Controls

Menu-driven access to all functions by way of three buttons and a two-line alphanumeric display. There are twoprogrammable passwords available to provide various levels of access to the control functions.

LED Indicators

Front panel LED indicators show the following control conditions: Out-of-Band RAISE, Out-of-Band LOWER,Reverse Power Flow REV PWR detected, and CPU OK.

Output Contacts

Alarm Contact Outputs (2): One normally open programmable contact and one normally closed self-testalarm contact; capable of switching 3 A at 120 V ac.

Voltage Measurement Accuracy

Voltage accuracy of

0.7% in accordance with ANSI/IEEE C57.15-1986 defining control accuracy of operation.

Communications

The communication ports provide access to all features, including metering, software updates, and program-ming of all functions. This is accomplished using a modem or direct serial connection from any IBM PC-compatible personal computer running the M-2029A TapTalk ® Communications Software package or SCADAcommunications software. COM1 (top) is available with RS-232, RS-485, or Fiber Optics. COM2 is an RS-232front port for local communications with TapTalk BECO 2200 and for software updates.

Protocols: The following standard protocols are included in COM1: BECO 2200, BECO 2179, Cooper 2179,GP2179, DNP3.0, MODBUS, and UCA2.0. COM2 uses BECO 2200 for local communications.

Communication Ports and Format: The control comes with two RS-232 communications ports, COM1 andCOM2. COM2 is located in the front of the unit. COM1 is located on top of the unit, and, as an option, can havetwo additional interfaces: RS-485, and fiber optic communications. Only one COMM port is active at a time.

Communications Via Direct Connection: TapTalk ® supports direct communication with a Beckwith ElectricM-2001B Digital Tapchanger Control via a serial “null modem” cable with a 9-pin connector (DB9P) for thecontrol, and the applicable connector (usually DB9S or DB25S) for the PC, or Fiber Optic communication usingST standard or two-wire RS-485.


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Beckwith2001BDigital

TapchangerControl

RS-232 Null modem (M-0423), RS-485(2wire), or Fiber Optic (ST) Cable

Printer

IBM PC - CompatibleRunning Windows™ 95,

NT 3.5, or later

To Transformer / Regulator

Max 50' (RS-232)

Figure 1 Direct Connection

Communications Via Modem: TapTalk ® supports remote (modem) communications with a BeckwithElectric M-2001B Digital Tapchanger Control. A Hayes-compatible modem and proper cabling is required.

Beckwith2001BDigital

TapchangerControl

IBM PC-Compatible

Running Windows 95,NT 3.5, or later

Figure 2 Modem Connection

Communications Using Networking: The addressing capability of TapTalk allows networking of multipleBeckwith Electric digital tapchanger controls. Each tapchanger control can be assigned an address rangingfrom 1 to 200. Selected commands may be broadcast to all controls on the network. Figures 3, 4, and 5illustrate typical network configurations.


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Communications-LineSplitter

Null ModemCable

“Str aight-Thr ough”Modem Cables Master Por t

Modem

Direct RS-232CConnection to PC

To Phone Line

M-2001BAddress 1

M-2001BAddress 2

M-2001BAddress 3

U p t o t

h r e e a

d d i t i o n

a l c o n t

r o l sD

DOWN

U

UP

EENTER

• RAISE• LOWER• REV

PWR•

OK

Made in U.S.A.

© 1992 BECKWITH ELECTRICD

DOWN

U

UP

EENTER


PWR•

OK

Madein U.S.A.

© 1992 BECKWITH ELECTRIC

DDOWN

U

UP

EENTER


PWR•

OK

Made in U.S.A.

© 1992 BECKWITHELECTRIC

Figure 3 Network Connection

Connect to PC

Dymec Model No. 5843

DDOWN

UUP

EENTER

• RAISE

• LOWER• REV

PWR•

OK

Made in U.S.A.


DDOWN

UUP

EENTER


PWR•

OK

Made in U.S.A.


DDOWN

UUP

EENTER

• RAISE

• LOWER• REV

PWR•

OK

Made in U.S.A.


TX

RX

Straight DB25

Connection toPC RS-232COM Port

ST Multi-mode 62/125 Optical Fiber

IBM-Compatible PCRunning M-2029A TapTalk

Communications Software

Figure 4 Fiber Optic Connection Loop


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Connect to PC

Model No. 485 LP9TBB & B ElectronicsRS-232/RS-485

DDOWN

UUP

EENTER


PWR•

OK

Made in U.S.A.


DDOWN

UUP

EENTER


PWR•

OK

Made in U.S.A.


DDOWN

UUP

EENTER


PWR•

OK

Made in U.S.A.


120 Ω

120 Ω

A

B

Straight DB9Connection toPC RS-232COM Port

IBM-Compatible PCRunning M-2029A TapTalk

Communications Software

Figure 5 RS-485 Network Connection

Application: Using a PC, the operator has real-time, remote access to all functions of the M-2001B DigitalTapchanger Control. The control can act as the monitoring point for all voltage, current, and related powerquantities, thereby simplifying operation while avoiding transducers and multiple Remote Terminal Unit (RTU)analog inputs. The protocols implement half-duplex, two-way communications. This allows all functions, whichwould otherwise require the presence of an operator at the control, to be performed remotely. Capabilities of thecontrol include:

• Interrogation and modification of setpoints

• Broadcast of commands, such as tap change inhibit and voltage reduction (up to three steps) tonetworked controls

• Recognition of alarm conditions, such as voltage extremes and excessive load

• Selective control of raise and lower tap change operations

• Re-configuration of the control, such as a change to the demand integration time period or aselection of different alarm parameters

Unit Identifier: A 2-row by 16-character alphanumeric sequence, set by the user, can be used for unitidentification.

EnvironmentalTemperature: stated accuracies maintained from –40° C to + 80° C.

Humidity: stated accuracies are maintained up to 95% relative humidity (non-condensing).

Fungus Resistance: a conformal coating is used on the printed circuit board to inhibit fungus growth.


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BECKWITH ELECTRIC CO., INC.6190 - 118th Avenue North • Largo, Florida 33773-3724 U.S.A.

PHONE (727) 544-2326 • FAX (727) 546-0121E-MAIL [email protected]

WEB PAGE www.beckwithelectric.com 800-2001B-SP-07MC1 09/03 © 1999 Beckwith ElectricPrinted in U.S.A. (09.24.02)

Transient Protection

High Voltage

All input and output terminals will withstand 1500 V ac rms to chassis or instrument ground for one minute witha leakage current not to exceed 25 mA, for all terminals to ground. Input and output circuits are electricallyisolated from each other, from other circuits and from ground.

■ NOTE: RS-232 and RS-485 communications ports are excluded.

Surge Withstand Capability

All input and output circuits are protected against system transients. Units pass all requirements of ANSI/IEEEC.37.90.1-1989 defining surge withstand capability.

■ NOTE: RS-232 communications port is excluded.

Radiated Electromagnetic Withstand Capability

All units are protected against electromagnetic radiated interference from portable communications transceivers.

■ NOTE: RS-232 and RS-485 communications ports are excluded.

ESD

Conforms to IEC 1000-4-2 Standard.■ NOTE: RS-232 and RS-485 communications ports are excluded.

Industrial Certifications

UL Listed

Physical

Size: 5 13/16" wide x 8 1/2" high x 3" deep (10.81 cm x 21.6 cm x 7.62 cm)

Mounting: Unit mounts directly to adapter or conversion front panels sized to replace popular industrytapchanger controls.

Approximate Weight: 3 lbs, 11 oz (1.67 kg)Approximate Shipping Weight: 6 lbs, 11 oz (3.03 kg)

Patent & Warranty

The M-2001B Tapchanger Control is covered by U.S. Patents 5,315,527 and 5,581,173.

The M-2001B Tapchanger Control is covered by a five year warranty from date of shipment.

Specification subject to change without notice.


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PRODUCT CAUTIONS

Before attempting any test, calibration, or maintenance procedure, personnel must be completely familiar with the particular circuitry of this unit, and have an adequate understanding of field effect devices. If a component is found to be defective, always follow replacement procedures carefully to that assure safety features are maintained. Always replace components with those of equal or better quality as shown in the Parts List of the Instruction Book.

Avoid static chargeThis unit contains MOS circuitry, which can be damaged by improper test or rework procedures. Careshould be taken to avoid static charge on work surfaces and service personnel.

Use caution when measuring resistancesAny attempt to measure resistances between points on the printed circuit board, unless otherwisenoted in the Instruction Book, is likely to cause damage to the unit.


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i

TTABLE OF CONTENTSM-2001B Instruction Book

Chapter 1 Introduction

1.0 Description ..........................................................................................1–1

1.1 Adapter Panel/Surface Mounting Kit .................................................1–1

1.2 Accessories ........................................................................................1–2

M-2029A TapTalk ®

Communications Software .................................1–2

Additional Communications Ports ......................................................1–3

M-2025B Current Loop Interface Module ...........................................1–3

Chapter 2 Front Panel Controls

2.0 Introduction .........................................................................................2–1

2.1 Display ................................................................................................2–1

2.2 User Interface Controls ......................................................................2–2

2.3 Status Indicators ................................................................................2–2

Chapter 3 Setting the Control

3.0 Introduction .........................................................................................3–1

3.1 Passwords ..........................................................................................3–1

3.2 Voltage Regulation .............................................................................3–2

Standard Control Settings..................................................................3–2

Voltage Regulation Without LDC ......................................................3–2

Bandcenter (BC) .................................................................................3–2

Bandwidth (BW) ..................................................................................3–2

Time Delay (TD) .................................................................................3–2

Voltage Regulation With LDC .............................................................3–4

LDC X/R ..............................................................................................3–4

LDC-Z ..................................................................................................3–4

3.3 Voltage Reduction...............................................................................3–5

3.4 Regulation Limits ................................................................................3–5

Overvoltage Limit & Voltage Runback ...............................................3–5

Undervoltage Block.............................................................................3–6

Coordination with Backup Relay ........................................................3–6

Tap Posit ion Block .............................................................................3–6

Overcurrent Block Operation ..............................................................3–6


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M-2001B Instruction Book

ii

3.5 Pulsed Output ..................................................................................... 3-6

3.6 Application Considerations ................................................................. 3–7

Chapter 4 Configuration

4.0 Introduction ......................................................................................... 4–1

4.1 Passwords ........................................................................................... 4–1

Initializing Passwords ......................................................................... 4–1

Configuring Passwords .......................................................................4–2

Disabling Passwords ..........................................................................4–2

Configuration Changes ........................................................................ 4–2

4.2 User Identification ............................................................................... 4–2

4.3 Alarm Relays ...................................................................................... 4–2

4.4 Counters ..............................................................................................4–3

4.5 Correction Factors .............................................................................. 4–3

4.6 Ratio Multipliers .................................................................................. 4–4

4.7 Tap Information...................................................................................4–4

Tap Position By Keep Track.............................................................. 4–5

Tap Position By Positive Knowledge (Current Loop) ........................ 4–5

Voltage Divider .................................................................................... 4–6

4.8 Reverse Power Operation................................................................... 4–6

4.9 Parallel Operation ...............................................................................4–7

4.10 Output Selection ............................................................................... 4–10

4.11 Protocols/Communication ................................................................. 4–10

4.12 Basic Timer Types ........................................................................... 4–10

4.13 Data Logging ..................................................................................... 4–10

4.14 Current Display/Scaling ....................................................................4–11

Chapter 5 Status

5.0 Introduction .........................................................................................5–1

5.1 Metering ..............................................................................................5–1

Secondary ...........................................................................................5–1

Primary ................................................................................................5–1

Demand Metering ................................................................................ 5–3Quantitative Metering .......................................................................... 5–3

5.2 Drag-Hand Display Quantities ............................................................5–3

5.3 Real-Time Clock .................................................................................5–3

5.4 Line Frequency....................................................................................5–3

5.5 Voltage Reduction Status ................................................................... 5–4


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iii

Chapter 6 Connections

6.0 Installation ...........................................................................................6–1

6.1 External Connections ..........................................................................6–1

6.2 Non-Sequential Operation ................................................................... 6–4

6.3 Multi-Step Voltage Reduction ............................................................. 6–4

6.4 LTC Backup Control ........................................................................... 6–5

6.5 Communication Ports .........................................................................6–5

Fiber Optic Interface (Additional Communications Port) ..................6–5

RS-485 Interface (Additional Communication Port) ...........................6–6

6.6 Grounding ............................................................................................6–7

6.7 Typical LTC Connection .....................................................................6–7

6.8 Typical Regulator Connection ............................................................6–7

Chapter 7 Test Procedure

7.0 Set-up Procedure ................................................................................ 7–1

7.1 Bench Test .......................................................................................... 7–3

Resistance .......................................................................................... 7–3

Reactance ........................................................................................... 7–3

Voltage Reduction ............................................................................... 7–3

Paralleling............................................................................................7–4

Counter ................................................................................................7–4

Block Raise/Block Lower/Deadband ..................................................7–4

7.2 Check-out Procedure ..........................................................................7–4

7.3 Operational Test .................................................................................7–6

7.4 In-Service Test ...................................................................................7–6

Chapter 8 Design Changes

8.0 Design Changes .................................................................................8–1

Chapter 9 TapTalk ®

9.0 Availability ...........................................................................................9–2

9.1 Hardware Requirements ......................................................................9–2

9.2 Installing TapTalk ...............................................................................9–2Starting TapTalk .................................................................................9–3

9.3 Communications using a Modem .......................................................9–3

Configuring the Control for Communication using a Modem ............9–3

Configuring TapTalk® for Communication using a Modem ..............9–4


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iv


(cont)

9.4 Communications using a Direct Serial Connection ...........................9–5

Configuring the Control for Communication

using a Direct Serial Connection .......................................................9–5

Configuring TapTalk for Commmunication

using a Direct Serial Connection .......................................................9–6

9.5 Communications with Multiple Controls .............................................9–6

9.6 Cautions ..............................................................................................9–7

9.7 Overview of Operation ...................................................................... 9–11

File ..................................................................................................... 9–11

Window .............................................................................................. 9–12

Communication Access ....................................................................9–12

Multiple Control Addressing ............................................................. 9–13

Control Access.................................................................................. 9–13

Control Access/Setpoints ................................................................. 9–14

Control Access/Configuration ........................................................... 9–16

Control Access/DNP Configurations ................................................ 9–18

Control Monitor.................................................................................. 9–20

Control Monitor/Status ...................................................................... 9–22

Control Monitor/Demand Metering .................................................... 9–24

Control Monitor/Energy Metering...................................................... 9–26

Control Monitor/Harmonic Analysis .................................................. 9–27

Control Monitor/Tap Changed Statistic ............................................ 9–28

Remote Control ................................................................................. 9–30

Data Logging ..................................................................................... 9–32

Data Logging to Control.................................................................... 9–32

Data Logging to PC .......................................................................... 9–33

Utili ties .............................................................................................. 9–34

Utilities/Control Information .............................................................. 9–34

Utilities/Communication Setup ......................................................... 9–34

Utilities/Set Control Date and Time ................................................. 9–35

Utilities/Set User Lines ..................................................................... 9–35

Utilities/Set New User Passwords ................................................... 9–36

Utilities/Set Communication Timer ................................................... 9–37

Utilities/Control Fiber Repeat ........................................................... 9–37

Help ................................................................................................... 9–37

9.9 Communication Cables ..................................................................... 9–38

Appendix A

A.0 Summary of Specifications ............................................................... A–1

A.1 External Connections......................................................................... A–1

A.2 Field Checkout Procedure ................................................................. A–1

A.3 Screen Review ................................................................................... A–3

A.4 Setpoint and Configuration Worksheets ......................................... A–15

Appendix B ........................................................................................................... B–1


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v

Figures Page

Chapter 1 Introduction

1-1 Functional Diagram .............................................................................1–2

1-2 Typical Adapter Panel Mounting ........................................................1–3

Chapter 2 Front Panel Controls

2-1 M-2001B Front Panel..........................................................................2–2


3-1 Inverse Time Delay Curve..................................................................3–3

3-2 Local Voltage as Function of Load Current When Using

Line Drop Compensation/Action of Overvoltage and

Overvoltage Runback Control ............................................................3–8


4-1 Paralleling Scheme for Two Transformers

using the Circulating Current Method ................................................4–9

Chapter 5 Status

5-1 Secondary Quantity Metering and Primary Quantity

Calculations for Regulator Applications ............................................5–2

5-2 Secondary Quantity Metering and Primary Quantity

Calculations for Transformer Applications .........................................5–2


6-1 Typical External Connections ............................................................6–2

6-2 Communication Connections ..............................................................6–6

6-3 M-2001B and LTC Transformer Control Typical Connections ..........6–8

6-4 M-2001B and Regulator Control Typical Connections ...................... 6–9


7-1 External Connections for Test Procedure .........................................7–27-2 Setup For Current Checkout Procedure............................................. 7–5


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vi


9-1 TapTalk Program-Item Icon................................................................9–3

9-2 Modem Plug and Play Properties Dialog Screen .............................. 9–5

9-3 Modem Plug and Play Connection Dialog Screen ............................9–5

9-4 Multiple Control Addressing Using

Communications Line Splitter ............................................................ 9–8

9-5 RS-485 Connection Tree .................................................................... 9–9

9-6 Fiber Optic Connection Loop............................................................ 9–10

9-7 TapTalk Menu Selections................................................................. 9–11

9-8 Communication Access (Serial) Dialog ........................................... 9–12

9-9 Communication Access (Modem) Dialog.........................................9–12

9-10 Modem Communication Setup ......................................................... 9–13

9-11 Edit Phone Book Dialog Screen ...................................................... 9–13

9-12 Setpoints Dialog Screen................................................................... 9–14

9-13 Configuration Dialog Screen ............................................................. 9–16

9-14 DNP Configuration 0–31 Dialog Screen ........................................... 9–18

9-15 DNP Configuration 32–63 Dialog Screen ......................................... 9–18

9-16 DNP Configuration 64–95 Dialog Screen ......................................... 9–18

9-17 DNP Configuration 96–127 Dialog Screen ....................................... 9–19

9-18 DNP Configuration 128–159 Dialog Screen ..................................... 9–19





9-23 Control Status Monitoring Screen .................................................... 9–22

9-24 Demand Metering Dialog .................................................................. 9–24

9-25 Energy Metering Screen ................................................................... 9–26

9-26 Harmonic Analysis Dialog Screen.................................................... 9–27

9-27 Tap Changes Statistic Screen ......................................................... 9–28

9-28 Remote Control ................................................................................. 9–30

9-29 Data Logging to Control Dialog Screen ........................................... 9–32

9-30 Data Logging to PC Dialog Screen .................................................. 9–34

9-31 Control Information Screen ..............................................................9–34

9-32 Control Communication Setup Dialog Screen ................................. 9–35


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vii

Figures (cont) Page


(cont )

9-33 Set Control Date and Time Dialog Screen ...................................... 9–35

9-34 Set User Lines Dialog Screen .......................................................... 9–35

9-35 New Passwords Setup Dialog Screen ............................................. 9–36

9-36 New User Level Password Confirmation Screen............................. 9–36

9-37 Communication Timer Screen .......................................................... 9–37

9-38 Null Modem Cable 9-Pin to 9-Pin .................................................... 9–38

9-39 Null Modem Cable 9-Pin to 25-Pin .................................................. 9–38

9-40 Modem Cable 9-Pin to 25-Pin .......................................................... 9–39

Appendix AA-1 Software Menu Flow ......................................................................... A–3

A-2 Status Screens .................................................................................. A–4

A-3 Bias Test Voltage Screen ................................................................. A–7

A-4 Setpoint Screens ............................................................................... A–8

A-5 Configuration Screens...................................................................... A–10

A-6 Programmable Alarm Function Screen ........................................... A–14

A-7 Setpoint Worksheet ......................................................................... A–15

A-8 Configuration Worksheet.................................................................. A–16

Appendix B

B-1 Data Output ........................................................................................ B–1


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Tables Page


3-1 Bandcenter, Bandwidth, Time Delay and

Line Drop Compensation Setpoint Ranges ......................................3–3

3-2 Approximate Ratio of Line Reactance to Resistance

(X/R) of Typical Distribution Circuits ................................................. 3–4

3-3 Intertap Time Delay Setpoint Range ................................................. 3–8


4-1 Tap Information Screen Selections ....................................................4–4


6-1 Multi-Step Voltage Reduction External Connections ........................6–56-2 B-0777 Adapter Cable Assembly .......................................................6–7


7-1 Initial Settings ..................................................................................... 7–3

800-2001B-IB-07MC3 03 /14 © 1999 Beckwith Electric Co.

Printed in U.S.A. (02.21.03)


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Introduction – 1

1–1

1Introduction

1.0 Description ................................................................................ 1–1

1.1 Adapter Panels/Surface Mounting Kit ..................................... 1–1

1.2 Accessories ............................................................................... 1–2

1.0 Description

The M-2001B Digital Tapchanger Control is amicrocontroller-based transformer and step-voltageregulator load tapchanger control.

The control is normally supplied with a separateadapter panel that is designed for initial OEM

installation on new transformers or to replace aparticular manufacturer’s tapchanger control. Thepanel is designed to mechanically and electricallyreplace an old control, with matching mountinghardware to facilitate the replacement. See Figure1-2, Typical Adapter Panel Mounting.

Interrogation of the control and setting changes aremade via the user interface, or through thecommunications ports. User interface consists of a16-character by 2-line display and threepushbuttons. Two passwords available to the userare accessed by the buttons and a third is accessedthrough the communications port. All setpoints are

stored in non-volatile memory which is unaffectedby control voltage disturbances.

Two operation counters are provided. One countermay be reset; the other may be pre-set by user.

Four LEDs are used to indicate Tapchanger Raiseand Lower command status, Reverse Powerdetection, and CPU OK.

The control uses a Motorola microcontroller whichhas a self-testing watchdog system. Refer to Figure1-1 for the functional diagram. The alphanumericdisplay and three-button interface providescomplete front panel access to the scrolling menuprogram shown in the Appendix, Figure A-1. The

control applies to tapchanger designs with manyconfigurations of taps (e.g., E16 taps,1 to 17 taps,0 to 33 taps, etc.).

1.1 Adapter Panel/ Surface Mounting Kit

An adapter panel or an M-2050 or M-2054 SurfaceMounting Kit must be used with the M-2001BTapchanger Control. Each panel adapts theM-2001B as a transformer and regulator controlreplacement and provides the external connections

necessary for operation via terminal blocks on therear of the adapter panel. Contact Beckwith Electricfor a list of adapter panels that are currentlyavailable. Refer to the Application Guides of thespecific adapter panel for the mounting details.See Figure 1-2 for a typical adapter panel mounting.


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1–2


The M-2050 is an adapter kit which permits surfacemounting of the control using two right angle mountingbrackets, four screws and a 24-pin connector withsix-foot pigtails on each pin. The M-2050 does not

include features available on adapter panels. Thesefeatures include mechanical configurations and wiringconnections for direct replacement, CT shorting orfront panel switches, fuses or test points. Refer tothe Instruction Manual of the M-2050 for the mountingdetails.

The M-2054 is an adapter kit which permits surfacemounting of the control using two right angle mountingbrackets, four screws and a 24-pin connector withsix-foot pigtails on each pin. Refer to the InstructionManual of the M-2054 for the mounting details andadditional information.

1.2 Accessories

M-2029A TapTalk ® Communications Software

TapTalk is a Windows-based communicationssoftware package available for remote control andmetering of the M-2001B Tapchanger Control. It isdesigned to interface with the microcontroller of thecontrol through an RS-232, RS-485, or fiber opticsport, at up to 19200 baud. The TapTalk softwaredisplays all pertinent operating information. Alloperations that can be performed from the frontpanel user interface of the control can be duplicatedremotely, through TapTalk. These operations include:

• Changing setpoint values. (This includesthose values for normal tapchanger controloperation, as well as custom configuration

to the site.)• Observ ing values. (This inc ludes

measured and calculated values of real-time operating parameters.)

• Data logging. The control can internallystore various parameters at selectedintervals. The Taptalk program candownload this data into an Excel ®

spreadsheet and display. Alternatively, thePC can be programmed to poll the controland obtain a pre-selected list of parametersat selected intervals.

Microcontroller

A/D

I

nputs

DigitalInputs

Outputs

Bus

I/O

EPROM

RAM

VacuumFluorescentDisplay

RAISE &LOWEROutputs

AlarmOutputs

SerialInterface

RS-232Port

PowerMonitoring

Circuits

Real-TimeClock

PowerSupply

InputVoltage

Line

Current

CircCurrent

TapPosInput

DigitalInputs

(6)

VT

CT

CT

LinearOpto-

Isolator

Opto-Isolator

6 6

StatusLEDs

Push-buttons

WatchdogTimer

SerialInterface

COM1

RS-232Port

RS-485Port

Fiber OpticPort

COM2

Figure 1-1 Functional Diagram


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Introduction – 1

1–3

Additional Communications Ports

The standard M-2001B Digital Tapchanger Controlcomes with two RS-232 communication ports, COM1and COM2. COM2 is located in the front of the unit.COM1 is located on the top of the unit. COM1standard is RS-232, and optional for RS-485 and

fiber optics. COM1, therefore, can have three differentinterfaces: RS-232, RS-485, and fiber opticcommunications.

M-2025B Current Loop Interface Module

The M-2025B is an external self-contained interfacedesigned to operate with the tapchanger control fortap position by positive knowledge, for LTCtransformer applications. The module connects tothe current loop output of a tap position monitor suchas the 1250-series INCON Programmable PositionMonitors. The tap position monitor has current loopoutputs whose level corresponds linearly to any of a

pre-programmed number of tap positions dependingon the tapchanger mechanism being monitored. Themodule accepts current loop ranges of:

• 0 to 1 mA

• 0 to 2 mA

• –1 to +1 mA

• 4 to 20 mA

The Tap Information screen is provided in theTapchanger's Configuration Menu to select whetherthe control uses the current loop method or the“keep-track” method for tap position knowledge.The M-2025B Current Loop Interface module isnot used with the “keep-track” method. The keep-track method is used with single-phase line

regulators having a counter contact and a neutralcontact. The M-2025B module easily connects tothe Tapchanger control through a six-pin connectorlocated on the bottom of the control. For moreinformation, refer to the Tap Position section ofthe Configuration chapter.

For parallel operation using the circulating currentmethod, the following accessories are needed: theM-0115 Parallel Balancing Module, the M-0127AC Current Relay and the M-0169 Auxiliary CurrentTransformer. For more information, refer to theParallel Operation section of the Configuration

chapter.The M-0329 Backup Relay is available to provideprotection against failure of the primary control.

Figure 1-2 Typical Adapter Panel Mounting


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1–4


This Page Left Intentionally Blank


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1

2–1

Front Panel Controls – 2

2Front Panel Controls

2.0 Introduction ............................................................................... 2–1

2.1 Display ....................................................................................... 2–1

2.2 User Interface Controls ............................................................ 2–2

2.3 Status Indicators ....................................................................... 2–2

Screen Blanking

The display automatically goes blank after exitingfrom any menu, or from any screen after 5 minutesof unattended operation. Manual screen blanking is

accomplished by pressing and holding the UPpushbutton and then the DOWN pushbutton, or viceversa.

Flashing C “CHANGE” Prompt

This prompt, in the bottom right corner of a screen,is enabled by initially pressing ENTER. This promptindicates that the user can change a setting usingthe UP or DOWN buttons to increment or decrementthe settings. Values have factory preset increments,such as 0.1 volt or 1 second. Press ENTER thesecond time to execute the setting change.

“ENTER” Prompt

When the “E” prompt appears in the top rightcorner of the drag-hand parameter screens andthe operation counter reset screen, it indicates thatthe value of display will reset if the ENTER button ispushed.

2.0 Introduction

The front-panel user interface consists of a vacuumfluorescent display and the UP, DOWN, andENTER buttons, and the status indicators as shownin Figure 2-1, M-2001B Front Panel.

2.1 Display

The display shows the desired function and itscurrent status or setpoint value. The function isdisplayed on the top line, and the bottom line showsits current status. The display is normally blankand remains so until one of the three buttons ispushed. Pressing any button will display the User

Lines screen, and then the Local Voltage screen.

Power Up Screens

Each time the control is powered up, it will briefly

display a series of screens that include model

number, serial number of the unit, software version

number, date and time, and user two-line

identification before blanking out.


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2–2


2.2 User Interface Controls

UP and DOWN Buttons

The UP and DOWN buttons have two functions.First, they are used to change screens and scroll

through selections. Second, they are used to enternew values by incrementing or decrementing thedisplayed value. The new value is not stored untilthe ENTER button is pressed a second time.

Pressing the UP or DOWN button for longer thanone second will cause faster scrolling, either whenselecting screens or when selecting setpoint values.

ENTER Button

The ENTER button is used to perform the followingfunctions:

• enter the change mode of a screen

• store a setpoint or condit ion inmemory

• enter an access code

• reset certain status screens

When entering an access code, the ENTER buttonwill move the cursor (an underline) to the selecteddigit location and the UP or DOWN button willchange the value. When the final digit is selected,and “C” is flashing, the new access code is enteredusing the ENTER button.

Sometimes it is desirable to leave a screen withoutmaking a change. In selecting setpoints or settings,wait 20 seconds without pressing the ENTER buttonand the “C” will stop flashing. At that point, the UPand DOWN buttons will again change screensrather than scroll the previous setpoint number orsetting choice. The previous changes of that screenwill not be recorded and the older setpoints orconfiguration choices will still be in effect.

When setting passwords, programmable alarmfunction or user lines in the Configuration Menu,the 20-second time-out is not functional and usercannot cancel once a new entry has been started.

2.3 Status Indicators

RAISE LED

The red LED indicates when the voltage is below theband edge and the timer has started timing for a

tapchanger raise operation.

LOWER LED

The red LED indicates that the voltage is above theband and the timer has started timing for atapchanger lower operation.

REV PWR LED

The red LED will light to indicate when the unitdetects reverse power flow.

OK LED

The green LED light will remain lit whenever poweris applied to the unit and the watchdog circuitindicates the microcontroller is working properly.

REV PWR

LOWER

RAISE

OK

Made in U.S.A.

CO. INC.BECKWITH

ELECTRIC

ENTER

UP

DOWN

E

U

D

VacuumFluorescent

Display

UserInterface

Controls

StatusIndicators

Current LoopConnector

24-PinConnector

RS-232 Port

GroundingStud

COM2

Fiber Optic Port RS-485 Port

Figure 2-1 M-2001B Front Panel


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Setting The Control – 3

3–1

3Setting The Control

3.0 Introduction .................................................................................3–1

3.1 Passwords .................................................................................. 3–1

3.2 Voltage Regulation .....................................................................3–2

3.3 Voltage Reduction ...................................................................... 3–5

3.4 Regulation Limits ........................................................................3–5

3.5 Pulsed Output.............................................................................3–6

3.6 Application Considerations ........................................................3–7

3.0 Introduction

NOTE: If the control is unresponsive to frontpanel entries due to remote blocking

using the TapTalk ® CommunicationsSoftware, front panel operation can berestored by using TapTalk’s RemoteControl screen to remove the block, ormomentarily removing power from thecontrol.

Local and remote control may be used at the sametime by designating “Local Mode” disabled.

Settings Entry

Use the UP and DOWN buttons to scroll to thedesired setpoint entry screen and press ENTER to

get into the change mode. Password is requiredfor entry into change mode, unless the Level 1password has been disabled. Use the UP, DOWNand ENTER buttons to change the setting.

3.1 Passwords

Password Access Screens

To prevent unauthorized access to the control

functions, there are provisions in the software forassigning up to three passwords. Two are for usewith the front panel controls and one is for use withthe communication interface. The passwords canbe set in the Configuration Menu. For moreinformation, refer to the Passwords section of theConfiguration chapter.

Access Levels

General access to read setpoints, to monitor status,to reset drag-hand parameters and the resettableoperations counter do not require a password.

The Level 1 password, if enabled, is required tomake local setting changes including the date andtime of day. If the Level 1 password is set to allzeros, this request for a password will not be seenand changes can be made without a password.

The Level 2 password, if enabled, is required tomake changes to the configuration, passwords,and user identification. If the Level 2 password isset to all zeros, this request for a password will notbe seen and changes can be made without apassword.


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28/130


3–3

NOITCNUF EGNAR TNIOPTES TNEMER CNI TLUAFED

GNITTES

r etnecdnaB V0.531otV0.001 V1.0 V0.021

htdiwdnaB V0.6otV0.1 V1.0 V0.2

yaleDemiT sdnoces021otdnoces1 dnoces1 sdnoces03

yaleDemiTesr evnI sdnoces021otdnoces1 dnoces1 sdnoces03

ecnatsiseR CDL V42+otV42- V1 V0

ecnatcaeR CDL V42+otV42- V1 V0

Z-CDL V42otV0 V1 V0

Table 3-1 Bandcenter, Bandwidth, Time Delay &

Line Drop Compensation Setpoint Ranges

Figure 3-1 Inverse Time Delay Curve


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3–4

Voltage Regulation with LDC

When it is desirable to regulate the voltage at somedistance from the transformer or voltage regulator,or in general to raise the voltage during high loadconditions, the Line Drop Compensation (LDC)feature is used.

Two different LDC methods are available in theM-2001B Digital Tapchanger Control. A configurationsetpoint called LDC Selection allows the user toselect from either of these methods.

The Bandcenter, Bandwidth, and Time Delayfunctions are set the same as if LDC were not used.

LDC X/R

A classical approach can be used to determine theX/R settings for the LDC, however this assumes aload center point and is usually not applicable to thetypical distribution feeder. For more information,contact Beckwith Electric for Application Note #17.

A simpler method, which will work for mostapplications, is recommended. This involves lookingat the lines leaving the station and determining thereactance/resistance (X/R) ratio for the main line.The reactive and resistive line drop compensationsetpoints should then be entered in this same X/Rratio.

If the CT and VT phasing corrections have beenmade, only positive values of R and X compensationneed to be used.

Table 3-2 gives the X/R ratio for various wire sizesand typical conductor spacings.

By knowing the ratio of the maximum expected loadto the present load, the amount of voltagecompensation needed is found as shown in thefollowing example.

Example

Desiredlocal voltage @ min load = 120 volts

local voltage @ max load = 124 volts

Using the following assumptions:Desired Bandcenter = 120 volts

Desired Bandwidth = 2 volts

The device being controlled is 50%

loaded

Setting

Start with R=0 and X=0 and increase both valuesusing the ratio shown in the table for the feeder

conductor. Keeping the X/R ratio, increase Rset

andX

set until the difference between the compensated

voltage and the local voltage is 2.0 volts.

This example would let the voltage vary from 119 Vat no load to 125 V at maximum load taking intoaccount the bandwidth.

With this simplified method of LDC setting, the firstcustomer’s voltage will be limited by the uppervoltage limit at the highest daily load, dependingon the accuracy of the daily load projection. At thesame time, the furthest customer will receive thehighest voltage possible under the line and loadingconditions. The first customer protection can beset on the control. Refer to the Regulation Limitssection of this chapter.

Since the daily load projections will likely have aseasonal variation, the best balance of firstcustomer to furthest customer voltage may require

seasonal adjustment of the LDC settings. Notethat the settings of R and X compensation areproportional to the peak load projection and thatnew settings can be scaled from the first settingobtained by the experimental process justdescribed.

RSCA REPPOC

MCM R / X MCM R / X

597 0.4 057 0.6

774 5.2 005 5.4

633 0.2 053 3.3

662 5.1 052 4.2

GWA R / X GWA R / X

0 / 4 2.1 0 / 4 0.2

0 / 2 0.1 0 / 2 5.1

2 5.0 2 7.0

6 2.0 6 3.0

Table 3-2 Approximate Ratio of Line Reactance

to Resistance (X/R) of Typical Distribution

Circuits

LDC-Z

The second available compensation method is calledZ-compensation (LDC-Z). LDC-Z must be selectedin the control configuration portion of the menu orsoftware and the VOLTAGE RAISE (V

R) setpoint

must be set in order for this feature to beimplemented. The LDC-Z application is especiallyuseful on systems where several lines exist withdifferent load centers where the proper compensation


30/130


3–5

is not related to any single R & X values as set in R& X compensation.

Basically, LDC-Z compensation consists ofdesignating a target bus voltage increase (line dropcompensation) that correlates to the magnitude ofthe control current rather than to the calculation of

input R & X line drop at control current magnitudeand angle values.

The setting, (VR), is the calculated line voltage

drop (at maximum load) in the circuit or line thathas the highest voltage drop at maximum loadcondition - ratio’d to the rated CT output (200 ma).

VR

= 0 to 24 volts in increments of 1 volt.

Example:

• Calculated voltage drop = 5 volts at loadlevel of 150 ma control current.

• VR

setting = 200/150 X 5 = 6.7 volts(rounded) = 7 volts

To calculate the line drop compensation at anygiven control current level (I):

• V = I/200 X 7 (setting):

If I = 50 ma; V = 50/200 X 7 = 1.75 volts

As with R & X compensation applications, the “blockraise” and “deadband” settings are used for firsthouse protection on all circuits or lines.

3.3 Voltage Reduction

Refer to the Appendix, Figure A-4. The controlallows three steps of voltage reduction via externaldry contacts or by serial port connection. Thepercentage voltage reduction at each step isadjustable from 0 to 10% in 0.1% increments. Whenone or more contacts are closed, the effect is toshift the bandcenter setpoint lower thus causingthe LTC to lower the voltage.

Recognize that the “effective” bandcenter may havebeen raised by line drop compensator action whenthe voltage reduction is initiated and that theresultant voltage setting will be the combination ofthe two effects. Note also that the undervoltageblock setting may limit the lowering of voltage,especially if there is little raising of the local voltagedue to LDC action.

When first initiated, or when a subsequent step ofvoltage reduction is needed, the control will respondimmediately to the voltage reduction command

without regard to either the intertap time delay settingor the control time delay setting. After the desiredvoltage reduction, operation will revert back to normaloperation with the time delay. Refer to the ApplicationGuide of the appropriate adapter panel for contactconnections.

Wired SCADA dry contacts or serial port connectioncan be used to provide stepped voltage reductionas described earlier. However, these should not be used together, since the resulting reductionwould be the "or" combination of the inputs.

3.4 Regulation Limits

Overvoltage Limit & Voltage Runback

Refer to the Appendix, Figure A-4. Setpoints areavailable to establish a block raise limit and voltagerunback. The overvoltage limit is adjustable from95.0 V to 135.0 V in 0.1 V increments. Theovervoltage limit must be set above the uppercontrol band limit. This limit is equivalent to a FirstCustomer Protector to limit overvoltage from linedrop compensation action during heavy loading.

The voltage runback level is the Block Raise settingplus the Dead Band setting. This deadband shouldnot be confused with the control deadband aboveand below the center voltage setpoint, which isgenerally called the control “bandwidth”.

The voltage runback deadband is used to assure

that the runback setting is above the upper voltagelimit setting. It is adjustable from 1.0 to 4.0 V in0.1 V increments.

If the voltage exceeds the runback limit, as mightbe caused by combinations of LDC action and loadshifts or by a system disturbance without LDCaction, the control will immediately call for an“automatic” lower without any time delay. The lowercommand will continue until the voltage is within thenormal control band.

Overvoltage block can be effectively disabled bysetting it to 135 V. By setting the runback deadband

to 4 V, the runback voltage becomes 139 V whicheffectively disables the feature.


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3–7

3.6 Application Considerations

Sequential/Non-Sequential/Blocking

The control normally operates in Sequential Mode.In this mode, the tap change output is initiated after

the time delay timer has timed out. The tap changeoutput will remain “on” until the control senses thatthe voltage has returned in-band. This permitssuccessive tap changes to be made in a “sequential”mode with no delay between tap changes.

If a delay between successive tap changes isdesired, an intertap time delay may be used. Thisvalue is set at the Intertap Delay screen in theConfiguration Menu. The value is set from 0 to 10seconds and will interrupt tap change outputs forthe preset time after a counter-contact closure isdetected by the control's operations counter input #1.

If the full initial time delay is desired, the controlmay be used in the “non-sequential” mode. Thismode is selected by applying a momentary contactclosure to the control's non-sequential operation/ auto tapchanger inhibit input from the counter-contact circuit or an auxiliary relay contact. Referto the Application Guide of the appropriate adapterpanel for details on implementation of non-sequential contacts.

If the closed contact supplied to the non-sequentialinput is maintained, instead of momentary, theinitial timer will not time out for the duration of themaintained contact, and the outputs of the control

will be effectively blocked.

Intertap Time Delay

The intertap time delay may be used in conjunctionwith sequential operation or pulsed output. Thenormal operation of this delay timer is as follows:once a tapchange command is initiated, whenthere would normally be a continuous command(raise or lower) to run the tapchanger until thevoltage has returned to within the band setting,there is now an intertap time delay initiated betweentapchanges. When the intertap time delay is set to

zero, it is disabled.

When invoked by a user who possesses Level 2security access (or above), the intertap time delaywill:

1. Recognize that a tapchange hasoccurred, indicated by the countercontact input.

2. Remove the output signal and wait forthe intertap time delay, even though thevoltage remains outside the designatedvoltage band.

3. Command another tapchange after theintertap time delay has expired, withoutregard to the basic timedelay setting, if the voltage remains outof band in the same direction as theprevious tapchange.

If the intertap time delay is enabled on a controlwhere non-sequential operation is enabled, theintertap time delay setpoint is disregarded. Thebasic time delay setting prevails for subsequenttapchange commands in the non-sequential mode.

NOTE: The intertap time delay is similar inoperation to non-sequential operation,but the two should not be confused.The intertap time delay applies a shortdelay after every tapchange, for theuser-selected time delay (0 to 60seconds). It is enabled via a menuscreen. The non-sequential operationtime delay will be the same as that of

the basic user-selected Time Delay asdescribed at the beginning of thischapter. For application with pulsedoutput, see Section 3.5, Pulsed Output.

Test Mode/Status Screen

This convenient screen permits entering a biasvoltage for simulating the raising or lowering of thesensed input voltage. This exercises the control asif the input voltage were being changed. The contactsactually operate.

The Test Mode/Status screen displays control status

information that includes:• Output Status

• Compensated Voltage

• Band Status

• Runback/Blocking Status

• Voltage Reduction Status

This screen automatically resets on exit or in fiveminutes if not exited. Refer to Appendix A, FiguresA-2 and A-3.


33/130


3–8

NOITCNUF EGNARTNIOPTES TNEMERCNI GNITTESLAITINI

yaleDemiTpatretnI sdnoces01ot0 dnoces1 sdnocess0

Table 3-3 Intertap Time Delay Setpoint Range

Load growsRaise operation blocked at

t = T1

Voltage increases furtherdue to system switching

Lower command issued att = T2

t t t

130

128

120

114

V L O C A L

Low LoadNo action on part ofvoltage limit control

T1 T1 T2

OvervoltageRunback

Block Raise

Bandcenter

Block Lower

Local voltage Raised Due to LDC

Figure 3-2 Local Voltage as Function of Load Current When Using Line Drop Compensation/

Action of Overvoltage and Overvoltage Runback Control


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Configuration – 4

4–1

4Configuration

4.0 Introduction .................................................................................4–1

4.1 Passwords .................................................................................. 4–1

4.2 User Identification ...................................................................... 4–2

4.3 Alarm Relays ..............................................................................4–2

4.4 Counters ..................................................................................... 4–3

4.5 Correction Factors ...................................................................... 4–3

4.6 Ratio Multipliers..........................................................................4–4

4.7 Tap Information ..........................................................................4–4

4.8 Reverse Power Operation ..........................................................4–6

4.9 Parallel Operation....................................................................... 4–7

4.10 Output Selection ....................................................................... 4–10

4.11 Protocols/Communication ........................................................ 4–10

4.12 Basic Timer Types ................................................................... 4–10

4.13 Data Logging ............................................................................ 4–104.14 Current Display/Scaling............................................................ 4–11

4.1 Passwords

Initializing Passwords (Control)

Refer to the Appendix, Figure A-5. The Level 1 andthe communications passwords are set to all 0000at the factory. The Level 2 password is set to 2222

at the factory and that password must initially beused to access the Configuration Menu. See Chapter9, M-2029A TapTalk ® , Utilities/Set New Passwordssection, for TapTalk passwords.

New passwords may be entered from the screenwithin the Configuration Menu as described below.As soon as new passwords are entered, they will berequired. Changing any setpoint or configuration willrequire the password, if enabled. Enter passwords with care and record them for future use!

4.0 Introduction

This section describes the Configuration Menu ofthe software flow. Refer to Appendix A, Figures A-5and A-8.

NOTE: Panel display for configured items do not

refresh. In order to reflect the change,user must scroll past the screens andthen return.


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4–2

88888 WARNING: Please record all passwords in asecure location. If the password is lost orforgotten, please contact the factory.

Configuring Passwords

The user who possesses the current Level 2

password may change any password using four newnumbers. No password is required if the Level 2 password has been set to 0000.

When ENTER is pressed while viewing the passwordat its screen within the Configuration menu, anunderline cursor is displayed under the digit furthestto the right of the password.

Each digit is changed by using the UP and DOWNbuttons to select the number. Use the ENTER buttonto move the underline to the left. When the underlineis on the far left digit, press ENTER and the newpassword is stored into nonvolatile memory. If a

wrong number has been entered, press ENTER asmany times as necessary and the underline willmove to the digit furthest to the right for entry of thecorrect password. This should be done immediatelyto ensure that an incorrect password is not stored inmemory.

If interrupted for approximately five minutes and thescreen goes dark and the digit furthest to the lefthas not been entered, the password will revert to theprevious one regardless of digits that have beenchanged. After a new Level 2 password has beenentered, the new password must be used to reenterthe Configuration menu. Be sure to record the new password for future use.

When a communication password has beenconfigured at the control, the communicationpassword allows the user to bypass both theconfiguration and setpoint passwords otherwiserequired by a control.

NOTE: The communication password is identifiedas a string #. Therefore, the passwords"001" and "1" are not interchangeable.

Each control can be given a unique, 4-digit passwordranging from 0 to 9999. If the password has beenconfigured at the control as 0000, communication isnot restricted a password does not need to beidentified by TapTalk. The control is shipped withcommunication password disabled (set to 0000).

Disabling Passwords

Any one of the three passwords can be disabledwithin the screens of the Configuration Menu bychanging the password to zero (0000). When apassword is disabled, its access screens will not beseen and the password will not be required.

Configuration Changes

Use the UP and DOWN buttons to display the ToConfiguration Menu prompt and press ENTER. TheLevel 2 password is required for entry, unlessdisabled. Use the UP, DOWN and ENTER buttonsto change the configuration.

4.2 User Identification

Changing User Lines

Refer to the Appendix, Figure A-8. The user stationidentification lines allow the user to uniquely identifythe unit. In normal operation, after five minuteswithout pushing a button on the display, the screenwill be blank. If the screen is blank, any button pushwill reactivate it and display the User Lines screen.Each line of this display can have up to fifteenASCII characters. Both of the lines are factorypreset with asterisks.

When ENTER is pressed at the User Line screen inthe Configuration menu, an underline cursor isdisplayed under the left-most digit. Each digit ischanged by using the UP and DOWN buttons to

select the ASCII character (the ASCII character listbegins with “!”). The ENTER button is used to movethe underline to the next digit. When the ENTERbutton is pressed for the right-hand digit, the newuser line is stored into nonvolatile memory.

4.3 Alarm Relays

Two alarm relays are provided in the control toindicate status. The first is a malfunction or loss-of-power alarm. Upon either of these conditions, a drycontact will close indicating that the control is out of

service. This contact will switch up to 3 amps at120 Vac.


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Configuration – 4

4–3

Refer to the Appendix, Figure A-6. The secondalarm relay is non-latching and is also capable ofswitching 3 A at 120 Vac and is user-programmableto indicate one or more of the following conditions:

• Block-Raise Voltage Limit exceeded

• Block-Lower Voltage Limit exceeded

• Voltage Reduction of any step is invoked

• Reverse Power Flow condition is detected

• Line Current Limit/Delta VAr ReactiveCurrent exceeded

• Tap Block Raise/Lower is in effect

• Communication Block is in effect

If none of the conditions are programmed, then thealarm output is disabled (factory default).

4.4 Counters

Operations Counter

The user must select the method of countingtapchanger operations consistent with thetapchanger.

X1 - operation count will increment by one with anopen-close-open state change on the tapchangercounter switch. The closed state may be present foras little as 20 ms. The open state may be presentindefinitely.

X2 - operation count will increment by one witheither an open-close or a close-open state changeof the tapchanger operation counter switch. Boththe closed and open states may exist indefinitely.

The counter accommodates 999,999 operationcounts and the number of counts stored in memoryis not affected by a loss of supply power. Totaloperation count is displayed in the Status Menu.This counter cannot be reset, but can be preset toany value up to 999,999 in the Configuration menu.

Resettable Operations Counter

A second, resettable, operations counter operates

with the method selected by X1/X2. The userresets this counter to zero by pressing ENTER

while viewing the resettable operation counter

screen within the Status Menu. No password is

required to reset the resettable operations counter.

NOTE: The counter will only increment ordecrement with a connection to thecounter input.

4.5 Correction Factors

VT Ratio Correction

Refer to the Appendix, Figure A-5. The operation ofsome regulators is such that the internal VT does

not provide the desired voltage ratio. In these cases,it is desirable to correct the VT secondary voltage toa 120 Vac reference base. This change is easilymade in software, eliminating the need for a multi-tap sensing transformer.

The correction is derived from information providedby the regulator original equipment manufacturer(OEM). The numerical value of the correction is thevalue, in volts, required to adjust the VT nominalsecondary voltage to 120.0 volts. The correctionrange is ±15 volts in 0.1 volt increments.

NOTE: The maximum allowable continuous VT

secondary voltage is 140 volts. Thecorrection is made only in software. As aresult, the value of V

LOCAL read on the

control display will differ from thatmeasured at the voltmeter test terminalsby the percent of the correction voltage.

CT/VT Phase Shift

Refer to the Appendix, Figure A-5. The control willrecognize forward and reverse power flow to theload. With the CT and VT (reference) signals in-phase for unity power flow to the load, it will properlycalculate line drop compensation. Depending on the

connection of the CT and VT, the phasors may notbe in-phase. If this is the case, the phase shift canbe corrected in software. The usual characteristicsof three phase systems only allow multiples of 30°phase shifts. The control, therefore, has a range of0° to 330° in 30° increments.

By comparing system operating conditions withpower flow direction and power factor as shown onthe M-2001B Tapchanger Control, improper phaseshift can be determined. An incorrect connectionmay be resolved using well-known phasor methods.The following procedure may be useful to check thechoice of correction or even to determine the

correction by trial and error:

1. Put the transformer or regulator onmanual control.

2. Determine the Watts and VArs load onthe transformer or regulator from othermetering.

3. Read the Watts and VArs indicated bythe control, and make certain that theyare of the same sign and ratio ofmagnitudes as obtained from the externalreadings.


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4–4

4. If not, change the correction in 30°increments until the control and externalreadings are in best agreement.

When two single-phase regulators are connected inopen delta, the current signals will be out-of-phasewith the voltage signals. For one regulator, the

current will lead the voltage by 30° and is called the“leading” regulator. For the “lagging” regulator, thecurrent will lag the voltage by 30°.

Contact Beckwith Electric for Application Note #17for more information on VT and CT connections.

4.6 Ratio Multipliers

Voltage & Current Multipliers

Refer to the Appendix, Figure A-5. Primary quantitiesare displayed when voltage and current multipliersare set into the control. The voltage multiplier is:

Vmult

= Vpri /(V

sec + V

corr)

For a VT ratio of 7620/117 V and a voltage correctionof 3 V, the multiplier is:

Vmult

= 7620/(117 + 3) = 63.5

The voltage multiplier setting range is from 0.1 to3260 in 0.1 steps.

The current multiplier is the value of the line CTprimary rating divided by 0.2 A. For a CT primary

rating of 1000 A, the multiplier is:

CTmult

= 1000/0.2 = 5000

The current multiplier setting range is from 1 to32600 in 1.0 steps.

Both multipliers are entered in the Configuration

menu.

8 WARNING: The current input to the control israted at 0.2 A continuous, 0.4 A for two hours,and 4.0 A for 1 second.

NOTE: The current transformer selection in theConfigure menu only changes the scalingfactor for current reading and setting.

4.7 Tap Information

The M-2001B Digital Tapchanger Control tap position

information applies to many different configurationsof tapchangers, e.g.,16 taps, 1 to 17 taps, 10taps, 1 to 33 taps, etc. Two configuration points,Tap Min and Tap Max, are assigned to allow theuser to select the range of a specific tap changer.The Tap Max range is 0 to 33 taps, and the Tap Minrange is –33 to +29 taps. The user is able toprogram the control to select the method of tapposition knowledge or to disable this feature. Table4-1, below, outlines the eight selections availablefor the Tap Information screen.

snoitceleSneercSnoitisoPpaTegdelwonK

dohteM

tnerruCegnaR

delbasiDsneercS

3#LANRETXERMFX pooLtnerruC Am1ot0 egatloVecruoS

2#LANRETXERMFX pooLtnerruC Am02ot4 egatloVecruoS

1#LANRETXERMFX pooLtnerruC ;2ot0;1ot0

ro Am1 egatloVecruoS

3#LANRETXEGER rediviDegatloV elbacilppAtoN enoN

2#LANRETXEGER pooLtnerruC Am02ot4 enoN

1#LANRETXEGER pooLtnerruC ;2ot0;1ot0

ro Am1 enoN

LANRETNIGER k carTpeeK elbacilppAtoN enoN

ELBASID enoN enoN ,egatloVecruoS

noitisoPpaT

Table 4–1 Tap Information Screen Selections


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Configuration – 4

4–5

Tap Position by Keep Track

▲ CAUTION: This feature is applicable to single-phase regulators only.

▲ CAUTION: This feature is only applicable fortap ranges with neutral tap and neutral indicator.The source voltage will only be applicable with a tap

range of16 taps.

This feature allows the control to keep track of thepresent tap position. The “Reg Internal” setting isselected for this method.

88888 WARNING: Do not rely on the tap positionindication on the M-2001B Tapchanger Controldisplay for neutral position when bypassingvoltage regulators.

The motor power source for the manual, automatic,or external (SCADA) initiated tap changes must bethe same as the motor power input to the control.

The operations counter and neutral light circuit shouldbe operational. The counter input and power sourceis required for detecting tap changes and determiningdirection of the tap change. Connecting a regulatorneutral tap position indicating contact to the controlwill reset the tap position to neutral each time thetap goes through the neutral position. It isrecommended that the indicated tap position becompared to the mechanical tap position indicatorat regular intervals, and that the indicated value becorrected, if necessary.

The tap position stored in memory is not affected bya loss of power. The tap position record is checkedand corrected to neutral, if necessary, with theclosure of a neutral contact (when the neutral tapposition contact is connected to the controls).

▲ CAUTION: When the keep-track tap positionmethod is used, it must be calibrated for propervoltage control with reverse power operation.

If desired, the keep-track feature can be disabled inwhich case the screen will indicate “Disabled.”

The user initializes the control at a given, known,tap position upon installation, by selecting RegInternal in the Tap Information screen in the

Configuration Menu and performing the followingsteps:

1. Determine the actual tap position fromthe external tap position indicator on theregulator.

2. Scroll through the display to the TapCalibrate screen in the Configurationmenu. Press ENTER. A flashing “C”indicates that the control is ready toaccept data. Press the UP or DOWN

pushbutton until the correct tap positionis displayed. Press ENTER again. Thetap position is now calibrated to recognizeall subsequent operations so as to “keep-track” of the present tap position.

3. The present tap position is indicated in

the Status Menu at the Tap Positionscreen.

Or, if the neutral tap position contact is connectedto the control, run the regulator to neutral as shownby the tap position indicator on the regulator. Thecontrol will recognize the neutral light signal and setthe tap position accordingly.

The keep-track procedure recognizes tapchangescommanded via manual, automatic or external(SCADA) contacts. The power source for the manual-or SCADA-initiated tapchanges must be the sameas the motor power source used for the automatictapchangers.

The keep-track position knowledge is based on thedetection of a closed switch (manual or automatic),and feedback from the operation counter input.

Tap Position by Positive Knowledge (CurrentLoop)

The control is equipped to receive analog signalsrepresentative of the LTC tap position such asthose provided by a tap position monitor (1250-series INCON Programmable Position Monitors, forexample).

The control accommodates the input signals, usingthe optional M-2025B Current Loop Interface Module.

Connection o

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