INVERTRON DBUDynamic Braking Unit

Instruction Manual

Manual P/N. 899.05.26 User Manual: 491328e (06)Publication INVDBU-UM006F-EN-P

ULC R

.

TABLE OF CONTENTS

49'1328 e DBU I

1. DESCRIPTION 1-1...1-2Operation....................................................................................................................... 1-1Line voltage selection .................................................................................................... 1-2Parameter setting on the inverter................................................................................... 1-2Permissible loading of the electronics ............................................................................ 1-2

2. SPECIFICATIONS 2-1...2-4Electrical specification of the Braking Unit ..................................................................... 2-1Ambient conditions......................................................................................................... 2-1Mechanical specification, dimensions ............................................................................ 2-2Optional Diagnostic Card BUD....................................................................................... 2-3

3. MOUNTING AND CONNECTION 3-1...3-3Mounting of the braking Unit .......................................................................................... 3-1Short circuit protection fuses.......................................................................................... 3-1Protection of braking resistors and conductors .............................................................. 3-1Connection..................................................................................................................... 3-1

4. DESIGN INFORMATION 4-1...4-2Calculation of braking power.......................................................................................... 4-1Calculation of braking resistors ...................................................................................... 4-1Example......................................................................................................................... 4-2

Appendix A CE-Conformity A-1...A-4EMC Directive ................................................................................................................A-1Mounting instruction.......................................................................................................A-1Wiring instruction ...........................................................................................................A-2Cabinet mounted units ...................................................................................................A-2Installation of standalone drives.....................................................................................A-4

Further documentation:Instruction manual for GV3000/SE AC General Purpose and Vector DrivePublication GV3000-UMxxxx-EN

GENERAL NOTES

II DBU 49'1328 e

Safety Instructions

DANGER, WARNING, and CAUTION point out potential trouble areas.

A DANGER alerts a person that high voltage is present which could result in severe bodily injury orloss of life.

A WARNING alerts a person to potential bodily injury if procedures are not followed.

A CAUTION alerts a person that, if procedures are not followed, damage to, or destruction ofequipment could result.

DANGER: Before installing and/or operating this device, this manual must be understood by thequalified electrical maintenance person who is familiar with this type of equipment andthe hazards involved. Failure to observe this precaution could result in bodily injury.

Machinery Directive

CAUTION: This device is a component intended for implementation in machines or systems for thecapital goods industry.

The start-up of this device in the European market is not permitted until it has beenconfirmed that the machine into which the device is built is in conformance with theregulations of the Council Directive Machinery 98/37/EWG.

Electromagnetic Compatibility (EMC-Directive)

CAUTION : The operating of this device in the European market is only permitted if the CouncilDirective Electromagnetic Compatibility 89/336/EWG has been observed.

It is the responsibility of the manufacturer of the machine or system to observe theimmunity and emission limits, requested by the Council Directive EMC in the Europeanmarket. Guidelines for the installation according EMC-regulations - for shielding,grounding, component arrangement as well as wiring instructions - are summarized inAppendix A CE-Conformance of this instruction manual.

DESCRIPTION

49'1328 e DBU 1 - 1

Operation

Frequency converters (Inverters) with DC bus and input diode rectifier bridge are suitable for theoperation of three phase AC-motors in two drive quadrants, motoring in both directions of rotation.

Braking with more than 10% of the rated inverter current is only possible with a braking unit.Without a braking unit, an excessively rapid deceleration causes an increase in the DC bus voltage.The regulator responds by• shut-down due to DC bus overvoltage tripping (e.g. on GV3000: Fault HU)• extending the set deceleration rate or increasing the output frequency depending on parameter

setting.

By the use of a Dynamic Braking Unit (DBU) and braking resistor the energy in the DC bus circuit canbe converted to heat.

The braking unit DBU is available in four sizes and two variants (Part No. in brackets):

DBU Size without Diagnostic card BUD with BUD built-in37 kW DBU-50 (837.02.01) DBU-50-DIS (837.02.02)75 kW DBU-100 (837.02.11) DBU-100-DIS (837.02.12)

150 kW DBU-200 (837.02.21) DBU-200-DIS (837.02.22)300 kW - DBU-400 (837.02.41) *

* The Diagnostic card BUD is always built in on DBU-400 as a standard

NOTE: Until sept.1997 the units DBU-50 (837.02.00), DBU-100 (837.02.10) and DBU-200 (837.02.20)with hysteresis type regulator BUA (813.25.00) have been delivered.The new PWM type regulator BUC (813.01.00) is fully compatible to the BUA regulator.

45

47

48

47

PE

47

45

DBU

+

T

1)

Udc > 50V I > 0

3) Set DBU-DIS 839.25.41

24 V 0 - 20 mA20 mA

24 V

29

101

T

0

115

M 2)

BUC 813.01.00

BU

S

813.

03.0

0

2)

- +

X1 1 2 3 4 5 6

PE

Diagnostic Card BUD

1) If the resistor overheats, this contact operates a disconnect that removes AC power from the drive.2) Fan on DBU-400 only 3) Diagnostic card BUD is built in on DBU-xx-DIS and DBU-400

Figure 1-1: Principle of operation of Inverter with braking unit

DESCRIPTION

1 - 2 DBU 49'1328 e

Line Voltage Selection

After removing the cover plate of the DBU the blue jumper plug with positions 460V / 415V is accessibleat the upper edge of the regulator card (middle on BUC, right on BUA).

This jumper plug defines the DC bus voltage at which the DBU switches the DB resistor to the DC bus.

When delivered from stock the DBU is adjusted for safety reasons to 460 V line voltage.NOTE: If the blue jumper plug is missing, the DBU is set to 415V.

For the Inverters INVERTRON VTI / VCI / VGI type 415 V the blue jumper plug must be changedfrom position 460 to 415.

Reason: On these inverters the max. permissible DC bus voltage is DC 720 V.This fault trip level is fixed and assigned to the power semiconductors. It requests a DBUturn-on voltage of 680 V, corresponding to 415 Vac line voltage selection.

For the GV3000 Inverters on line voltages up to 415 V the blue jumper plug must be set to position 415.

For the GV3000 Inverters on line voltages above 415 V and all the other inverters VTI / VCI / VGI type460 V, GMI, GP2000 and SP500 the jumper must stay in position 460.

Parameter Setting on the Inverter

WARNING!If an inverter drive is equipped with braking unit, the deceleration ramp extension or regenerativetorque limitation must be switched off depending on DC bus voltage. Please refer to the inverterinstruction manual.

Permissible Loading of the Braking Unit

To prevent thermal overload of the Braking Unit, assure that the unit works within the following limits:In a time range of 10 minutes the permissible loading must be limited to the following current-time areaof any shape Imax x 2.5 minutes, with the following exception:

On DBU-400 current loading Imax (400 A) is permitted for 110 seconds every 10 minutes.

Examples:

1) Linear deceleration to zero speed of a drive withhigh inertia connected (e.g. centrifuge)

2) Drive with active load (e.g. crane)

5 min.10 min.

Pmax

5 min.10 min.

Pmax

Pmax 2

Figure 1-2a Figure 1-2b

SPECIFICATIONS

49'1328 e DBU 2 - 1

Electrical Specification

Table 2-1: Power Ratings

DBU-50 DBU-100 DBU-200 DBU-400

Maximum braking current Imax 50 A 100 A 200 A 400 A*

Minimum braking resistor permittedfor max. braking power:

with 415V jumper 12.8 ohms 6.4 ohms 3.2 ohms 1.6 ohms

with 460V jumper 14.4 ohms 7.2 ohms 3.6 ohms 1.8 ohms

Continuous braking power at 460 V 9 kW 18 kW 36 kW 72 kW

Short-time braking powerwith 415V jumperwith 460V jumper

34 kW37.5 kW

68 kW75 kW

135 kW150 kW

270 kW*300 kW*

Power loss (average) 250 W

*On DBU-400 current loading Imax (400 A) is permitted for 110 seconds every 10 minutes.

- Maximum DC bus voltage at terminals 45-47:........................................................................ DC 800 V

- Turn-on and Turn-off voltage of the DBU: ON OFF

a) with BUA: 415V jumper DC 680 V DC 650 V460V jumper (default) DC 750 V DC 720 V

b) with BUC: Pulse width modulation PWM with 1 kHz switching frequency

Pulse width

720 750

100% 95%

0%

650 680

BUC

BUA

BUC

BUA

VDC

jumper 415V jumper 460V

Figure 1-3: DC bus voltage depending on pulse width (on BUC) respectively duty ratio (on BUA)- Power consumption of the control circuits .................................................................................. 27 mA

Fan connection voltage and current consumptiononly on DBU-400, terminals 0, 115. ...................................................................115 V, 50/60 Hz, 0.2 A

Ambient Conditions

- Operation temperature .................................................................................................... 0 - 40 degr C

For temperatures higher than 40 degr C up to max 55 degr C,the nominal continuous current Inom must be derated by ......................................1.5% per degr C

- Storage ........................................................................................................... -25 degr C....+55 degr C- Transportation..................................................... -25 degr C....+70 degr C (+70 during max. 24 hours)- Degree of protection....................................... .............................................................................. IP20

SPECIFICATIONS

2 - 2 DBU 49'1328 e

Mechanical Specification, Dimensions

121.5

ø6.5

220

7 206

206

103

103

206

7

Weight: 3.1 kg

Figure 2-1: Dimensions and fixing holes for the Braking Units DBU-50 and DBU-100

80

8

350

157

PE 48 45 47 47

215

225

55

32

42 36 36 36 25 50

6.5

589

356

PE 47 47 45 48

1)

2)

3)

4)

310

0/115/29/101

29 101

Type Weight: Power connections Control connections PE FanDBU-200 9 kg Terminal block below 1) Terminal block below 1) below withoutDBU-400 10 kg Bus bars above 2) Terminals at fan carrier 3) above with 4)

Figure 2-2: Dimensions and fixing holes for the Braking Units DBU-200 and DBU-400

SPECIFICATIONS

49'1328 e DBU 2 - 3

Optional diagnostic card BUD

The diagnostic card BUD, (part No. 813.02.00) is incorporated on units DBU-xx-DIS and all DBU-400.

On units DBU-xx (with PWM-regulator BUC) the diagnostic card option set DBU-DIS (Part No. 839.25.41)can be built in on site or used as a replacement part.On DBU-400 units the BUD card is always built-in as a standard.

The BUD works independent from the DBU regulator based on separate DC bus voltage feedbackvalues and the voltage across the DB resistor. It replaced the DBU indication card BUB (set 839.25.00)and contains besides the DC bus voltage and braking current indications two additional diagnosticfunctions (available at terminals).

Udc > 50V I > 0

Set DBU-DIS with Diagnostic Card BUD

24 V 0 - 20 mA20 mA

24 V

- +

X1 1 2 3 4 5 6

DBU

Figure 2-3: Block diagram of the diagnostic card BUD (Set DBU-DIS)

Indications

• DC bus voltage: left LED lights when UDC > 50 V• braking current : right LED lights when IB > 0

Switched output S1-2 (UDC > 50V)

Wearless transistor switch between terminals 1 (-) and 2 (+)

• S1-2 is closed, when UDC > 50 V and IB = 0

• S1-2 is open, when UDC > 50V and IB > 0, or when UDC < 50 V.

As shown in figure 2-4, switch S1-2 is closed after charging of the DC bus, at motor stand still or inmotoring operation mode.

motoring regenerativeoperation operation

UDC

0

S1-2

Figure 2-4: Status of switch S1-2 depending on DC bus voltage

This switched output is a monitoring device for the DC bus and the function of the DBU, workingindependent from the frequency converter and the DBU-regulator.

Loading of the transistor switch:........................................................................................ 24 V / 20 mA

SPECIFICATIONS

2 - 4 DBU 49'1328 e

Analog output A5-6

Signal A5-6 at terminals 5 and 6 is depending on the power P dissipated in the DB resistor.

The analog signal is generated through a filter circuit from the modulated voltage across the DB-resistor. The indication range 0% to 100% pulse width (on BUC) respectively duty ratio (on BUA)corresponds with 0 - 20 mA.

The scaling of the analog signal is depending on:

• jumpers 460V / 415V in relation with UDC and pulse width according to Figure 1-3,• DB resistor selection, taking into account the minimum values according to Table 2-1,• pulse width (on BUC) respectively duty ratio (on BUA) ED in %.

Calculation: P = ED x UDC2 / R x 100 with 415V jumper: UDC = 650 V + (1.6 x analog signal [mA] )

with 460V jumper: UDC = 720 V + (1.6 x analog signal [mA] )

Example: jumper 460V, DB resistor 10 ohms4 mA = 20% ED at 726V: 52.7 x 0.2 = 10.6 kW

19 mA = 95% ED at 750V: 55.4 x 0.95 = 53.4 kW (95%, 750 V are maximum values)

The analog output at terminals 5 and 6 must be supplied through an external DC current source atterminals 4 (0 Volts) and 3 (24 V).

MOUNTING AND CONNECTION

49'1328 e DBU 3 - 1

Mounting of the Braking Unit

For free air circulation through the cooling fins of the power section, the braking unit must be screwedonto a vertical panel according to figures 2-1 or 2-2. To prevent overheating due to heat build-up,minimum clearances for air circulation of 100 mm above and below the unit must be observed.Requested cooling air on forced ventilated DBU-400 is 158 m3/h (air flow direction from bottom to top).

Short Circuit Protection Fuses

A defective free wheeling diode will cause discharge of the Inverter-Bus into the braking unit. Thereforethe connections between inverter and braking unit (45-45 and 47-47) must be protected by the followingfuses:

Table 3-1: Short Circuit Protection Fuses

without Fuse Trip Indication with Fuse Trip IndicationUnitType

2 Fuses Type: aR, 660 V

Fuse Holder 2 Fuses Type: aR, 660 V

Fuse Holder

Part No. Type Part No. Part No. Type Part No.

DBU-50 50 A 553.15.00 22 x 58 511.27.13 63 A 553.44.00 27 x 60 512.32.02

DBU-100 100 A 553.18.00 22 x 58 511.27.13 100 A 553.44.02 27 x 60 512.32.02

DBU-200 200 A 553.44.05 27 x 60 512.32.00 200 A 553.44.05 27 x 60 512.32.02

DBU-400 400 A 553.32.15 DIN 80 511.24.00 400 A 553.32.15 DIN 80 511.24.00Switch: 553.26.29

Terminal Protection Cover (Pair) for fuse holder Type 27 x 60: Part No. 512.32-10

Protection of Braking Resistors and Conductors

In case of a failed DBU (IGBT short circuit or constantly ON command) the rectified AC line voltage ispassed to the braking resistor. This fault is not detected with the temperature sensor on the heatsink ofthe DBU, as the IGBT is not switching and therefore its temperature is not increased.

To inhibit possible damages due to overload on braking resistors, leads and input rectifier,it is recommended to install:

• a thermal switch on the braking resistor heatsink or

• the optional indication card BUD with connection of switched output S1-2

The contact of the thermal switch should be wired in series with the thermal switch on the DBU.

Connections

Connect braking unit, fuses and braking resistors according to the wiring diagram in Figure 1-1.

Table 3-2: Control - and Signal Connections

Control terminalThermostatFan supply

29,101 0,115

Cable cross section max. 4 mm2 (AWG11)Tightening torque 0,8 Nm

Press contact typeterminals atBUD-Card

Signal outputs

1, 23, 45, 6

Cable cross section max. 1,5 mm2 (AWG16) Use screenedcable *

* Two cable clamps at the fan carrier (part of the BUD Option) serve as grounding of the shield as wellas pull-relief.

MOUNTING AND CONNECTION

3 - 2 DBU 49'1328 e

Power Connections

Refer also to the installation instructions according EMC regulations in Appendix A.

1. Connection leads between Inverter and DBU

During switching of the braking units IGBT the inductance of the lead between the DC bus capacitors ofthe Inverter and the DBU generates short time (some µs) overvoltage peaks. These overvoltages ∆U,which are damped by RC snubber circuits in the DBU, must not exceed 200 volts. This can be reachedon single motor drives (acc. to connection example a) by the following measures:

• limitation of the total cable length between Inverter and DBU to 1,5 m.This must be strictly followed, specifically on DBU-200 and -400.

• The conductors must be bound together and run separated from other conductors or multi core cable(EMC shielded) to reduce the cable inductance.

If a DBU is connected to several inverters, which are coupled through a common DC bus, ∆U must alsonot exceed 200 volts. The inductance of the DC bus connection leads to the engaged DC bus capacitorsmust be kept low by the following measures:• short leads with low inductance,• placing of the DBU between the biggest DC bus capacitors.

General applies: ∆U = L

C• ∆ I

∆U: local permitted overvoltage on the DBU: 200 VL: effective inductance of the DBU input leads for the switched current ∆IC: effective capacitance of the snubbers on the DBU according to Table 3-3∆I: switched current, depending on jumper 415V / 460V and R.

Connection example

Connection of a DBU 400 to single motor drives

4747

4545

DBUGV3000max. 1.5m

MOUNTING AND CONNECTION

49'1328 e DBU 3 - 3

2. Connection leads between DBU and DB resistor R

Because of the many different types of DB resistor constructions the inductance differs in a wide range.High inductance (e.g. wire wound on ceramic core) at low resistance can limit the permitted lead lengthespecially for DBU-200 and -400.

General applies: τ = L/R including connection lead must be < 20 µs.

The inductance of the conductors can be reduced by bounding together single leads or using multi core(EMC shielded) cable.

To connect the braking resistors, heat-resistant cables and cable sockets are to be used (min. 90°C).For cable cross sections (mm2) depending on max. continuous braking current (rms) and tighteningtorque see Table. 3-3

Table 3-3: Power connections

DBU-50 DBU-100 DBU-200 DBU-400

Max. mean rms braking current [A](Imax, 25% duty ratio) for cable selection 25 50 100 200

Capacitance of the built-in snubber [µF] 1 1 1 5

Connection No.

DC bus, brakingresistance

Terminals up to35

2, bus barswith bolts M10above 352

45, 47,47, 48

Maximum wire size mm2

AWGTightening torque Nm

166

2,5

166

2,5

352

2,5

954/010

Earth protectionTerminals up to35

2, bolts M10above 352

PE Maximum wire size mm2

AWGTightening torque Nm

166

2,5

166

2,5

166

2,5

954/010

DESIGN INFORMATION

49'1328 e DBU 4 - 1

Calculation of braking power

Calculation of the braking power P at linear braking rate tB

P [kW] = J n n

91200 tB

• ••

∆

J [kg m2] : moment of inertia of the drive systems, relative to the motor shaft

n [min-1] : speed before the braking process

∆n [min-1] : difference in speed before and after the braking process during tB

tB [s] : braking time for ∆n

Please note that a linear braking rate at the beginning of the deceleration will require maximum brakingpower (as calculated) and the braking power then decreases linear with speed.The maximum braking power is an essential dimensioning criteria for DBU and DB resistor.

Calculation of the maximum braking power Pmax and minimum braking time tB mindepending on maximum inverter current

Pmax [kW] = Un . Imax . cos ϕ . 3 . η / 1000

Un [V] : nominal motor voltage

Imax [A] : maximum output current of inverter device

cos ϕ : cosine phi of the motor (0.86)

η : efficiency ( ≅ 0.9)

The minimum braking time can then be calculated as follows:

tB min = J n n

91200 Pmax

• ••

∆

If the moment of inertia J is not known, the braking time can be determined from the acceleration time.To do this, accelerate the drive at a fast rate in current limit and measure the acceleration time.The braking time must be selected to be smaller than this acceleration time.

Calculation of resistance value

The resistance value R ≥ Rmin in ohms depending on max. braking power can be calculated as follows:

for 380/415 V: R = 439

P [kW]for 460 V: R =

534

P [kW]

NOTE: When selecting the actual resistance value and the DBU type, make sure that at maximumbraking power the duty ratio of the DBU is as high as possible.

Specification of the braking resistor

Please contact your braking resistor supplier.

The following information is required for specification of the braking resistor:

Duty cycle, braking time - cooling time• maximum braking power, resp. max. braking current and duty ratio• average braking power and duty ratio

- maximum DC bus voltage, see jumper 415/460, depending on inverter type.- time constant of the braking resistor, ratio τ = L/R, specifically on resistors for

DBU-200 and DBU-400 with long resistor connection cables.

DESIGN INFORMATION

4 - 2 DBU 49'1328 e

Example

Roller table with 20 motors:

Each motor: 2.5 kW, 4.5 A, 460 V - 60 Hz120 operations/hBraking time: 1.8sBraking torque = nominal torque150% Overload capability required: 90 x 1.5 = 135 A

Total power: 20 x 2.5 kW = 50 kW / AC 90 A → GV3000 AC140

Braking resistance R =534

50 kW =10 Ω → DBU 75 kW, Part No. 837.02.11 required

Order from qualified supplier a braking resistor with the following specifications:

Resistance value: 10 ohmsBraking power: 50 kWBraking time: 1.8 sCooling time: 28 sMax. DC voltage: 800 V

A - CE CONFORMITY

49'1328 e DBU A - 1

EMC Directive

This device is a component intended for implementation in machines or systems for the capital goodsindustry. The units have been tested to meet Council Directive 89/336 Electromagnetic Compatibility(EMC) and all applicable standards (listed in the technical construction file).

With the measures as described in this guidelines the DBU can be operated CE-conform according toproduct standard EN 61800-3 or generic standards EN 50081-2, EN 50082-2 as follows:

Emission limits:Class A, group 1 in the first environment (public LV supply network) on inverters with RFI filter,Class A, group 2 in the 2nd environment (industrial supply network) on inverters with RFI filter,

group 2* in the 2nd environment (industrial supply network) on inverters with HF filter.

Immunity: Performance criteria A in the 2nd environment (industrial supply network).For information about RFI- and HF-filters refer to the GV3000 Instruction manual.

CAUTION: The conformity of the device to any standard does not guarantee that the entireinstallation will conform. Many other factors can influence the total installation and onlydirect measurements can verify total conformity. It is therefore the responsibility of themachine manufacturer, to ensure, that the EC-conformity is met.

Essential Requirements for Conforming Installation

The following items are required for CE conformance:

1. The complete drive system must be electromagnetically closed (Faraday cage).

2. This can be accomplished either by mounting all drive components (Inverter, RFI-Filter, DBU andbraking resistor) in a common cabinet (see Figure A-2) or in separate metallic enclosures (A-3).

3. Between the different drive components (inside or outside of enclosures) and the protection earthof the line input (PE) an uninterrupted connection (green/yellow conductors) must be provided toensure correct grounding of the equipment.

4. All external power wiring (except line input) must be screened cable or run in a separate steelconduit (e.g. DBU to braking resistor).

5. The braid of screened cables must be connected either to the common cabinet ground bus-bar orto the enclosure by the use of suitable, EMC-tested cable glands.

Mounting Instructions

Cabinet Mounted Drives (see Figure A-2)

If the Drive Components are mounted in a cabinet, the following rules must be observed:

• If located in a common cabinet, all drive components must be screwed directly to a blank (notpainted) panel with good conductivity and the largest possible contact area.

• The support panel for the DBU and inverter with filters must be a conducting steel sheet, with acommon ground busbar at the bottom. This ground busbar, mounted in front of the terminals, mustbe solidly connected to the panel, ensuring good conductivity.

• All cable screens, entering the cabinet must be solidly connected to the control cabinets groundbusbar or to the ground stud of the inverter with a large connection area and good conductivity toensure that the grounding represents a low impedance for HF-signals.

• Galvanized cable brackets as shown in Figure A-1 are recommended.

Standalone Drives in Enclosures (see Figure A-3)

• If the drive components (Inverter, RFI-Filter, DBU and braking resistor) are mounted in separateenclosures, this must be metallic conductive and the diameter of ventilation holes should notexceed 6 mm.

• The spacing between braking resistor assembly and enclosure shall be 100 mm minimum.

A - CE CONFORMITY

A - 2 DBU 49'1328 e

Wiring Instruction

General

• All the leads of a cable connection shall have the same cross section.(earth conductors with cross section >162 : min. 162 or 50% of phase lead)

• The connections between Inverter and DBU should be as short as possible!!

• Signal leads inside the cabinet must be distanced from Power leads.

Screened Cables entering the Control Cabinet (see Fig. A-2)

• The screen must be tinned copper braid or tinned steel braid.

• If screened cables are not available (limited by the obtainable cross sections) the individualconductors and protective conductors must be run in steel conduits or enclosed metal cable ductsalso connected to earth at both ends.

• Signal and control leads (e.g. reference, feedback, relays) must be screened cable as specified inFigure A-1. The individual conductors must be stranded, but twisted pairs are not required.The screen must be grounded at both ends.

• The motor cable shall be 4-wire screened cable (3 phases and earth conductor green/yellow) asspecified in Figure A-1 or run in a separate steel conduit.

Power Connections between IP20 Enclosures (see Fig. A-3)

• The power cables between inverter - DBU enclosure and DBU enclosure - braking resistorenclosure shall be 3-wire screened cable (+, - and earth conductor green/yellow) as specified inFigure A-1 or run in a separate steel conduit.

• Between the different enclosures and the protection earth of the line input (PE) an uninterruptedconnection (green/yellow conductors) must be provided to ensure correct grounding of theequipment.

• The braid of screened cables must be connected to the enclosures by the use of suitable, EMC-tested cable glands.

Stranded copper wire

Plastic insulation

Inner plastic sheath

Compact screen of galvanized (tinned) copper or steel braid

Outer plastic jacket

Figure A-1: Specification for screened cable

Cable Glands• Use suitable EMC-tested cable glands only.

• The conductivity of the screen earth connection is ensured by laying the braid over a plastic conewhich will press it to the inner side of the gland when mounted.

• It is important that the connection area is 360 degree around the cone.

• The cable glands provide pull-relief through the cable jacket.

A - CE CONFORMITY

49'1328 e DBU A - 3

Configuration

U,V,W L1- L3

U,V,W

M

PE

PE

2

1

5

3

4

G

R

DBU

45, 47

Cabinet

Panel

Braking resistor

Inverter

RFI-Filter

AC-Input line reactor

AC-Input contactor

AC-Input fuses

Terminals for 4-wire AC-inputcable (L1,L2,L3, PE)

Cabinet protection groundbusbar

➀ Cable bracket

➁ Shield

➂ Shielded 4-wiremotor cable

➃ Shielded signalconductor cable(feedback, reference)

➄ EMC-tested armoredcable gland at terminal box

Figure A-2: Example for control cabinet configuration

A - CE CONFORMITY

A - 4 DBU 49'1328 e

Installation of Standalone Drives in IP20 Enclosure

U,V,W

R, S, T (L1, L2, L3)

U,V,W

M

PE

5

3

4

RFIFILTER

5

INVERTER

1

G

L1, L2, L3

6

E

L1', L2', L3'E'

45,47R

DBU

45,47 47,48PE

6 6

➀ AC-Line input

➂ Screened 4-wire motor cable

➃ Screened signal conductor cable(feedback, reference)

➄ EMC-tested armored cable gland at inverter and terminal box

! Screened cable with PE-conductor

Figure A-3: Example for standalone drive configuration

.

Publication: INVDBU-UM006F-EN-P 4. 2001 © 2001 Copyright Rockwell International Corporation

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