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Electrical safety...always one step ahead

A-ISOMETERIRDH275, IRDH375, IRDH575

Electrical safety...always one step ahead

A-ISOMETERIRDH275, IRDH375, IRDH575

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IRDH... speak in plain language

All text messages are displayed as plain text on the illumi-

nated display and are emphasized by brightly lit LEDs.

IRDH... inform at the press of a button

Additional information such as system leakage capacitance,

parameter values etc.are immediately available at the pressof a button.

IRDH... simple to operate

The user-friendly menu structure and large keys makes thedevice simple to operate.

Variable installation

The panel-mounting enclosure is easy-to-install into the fascia of a switch-

board. In this way, the entire information is available to the user at aglance.Terminal cover and shock-hazard protected connection termi-nals provide additional protection.The IRDH275 series is designed for

installation into a switchgear cubicle (DIN rail).

T H E N E W D E V I C E F A M I LY A - I S O M E T E R I R D H 27 5 , I R D H 3 7 5 A N D I R D H 5 7 5

Whichever IT system you have,

the A-ISOMETERs IRDH275/375/575 will monitor them all

The use of unearthed power sup-plies (IT systems) is of the essence

in all electrical installations wherehigh operating safety and reliabi-

lity is paramount. IRDH275/375/575- the new family of innovative

A-ISOMETERs is exactly adaptedto the requirements of modern

power supply systems. The newAMPPlus measuring principle allows

exact measuring of the insulation

resistance,even in extended ITsystems and installations includingvariable-speed drives.

A solution that helps

to keep the costs lowComprehensive information and

clear indication via a plain textdisplay and yet simple-to-use

makes this device family standout where safety is important.

Time is gained and expensiveinterruptions can be avoided

thanks to advance information. Front view of the A-ISOMETER IRDH575, IRDH375 and IRDH275

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The modular system

Time gained thanks to flexibility

Basic functionThe A-ISOMETER IRDH275/375measure the insulation resistance

and indicate the measured value

on the display. If the measuredvalue falls below the preset value,

an alarm message is provided.

Monitoring several

interconnected

IT systems

Only one A-ISOMETER may beactive in each IT system.TheA-ISOMETERs IRDH275B/375B

can be configured accordingly sothat this requirement will always

be met when several IT systemsare interconnected.The RS485

interface (BMS protocol) providesthe necessary information exchan-

ge between the A-ISOMETERs.

Insulation monitoring

with automatic fault

location (EDS)If an insulation fault occurs, it mustbe localized and eliminated in order

to guarantee operating safety.Forfast, automatic localization of the

faulty circuit, the IRDH575 and theinsulation fault evaluator EDS47...-

12 with the appropriate measuringcurrent transformers are combined

to provide a complete insulationfault location system.

Basic function of the IRDH275

Monitoring of several interconnected IT systems

Insulation monitoring with automatic fault location (EDS)

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For various application fields

Techniques that convinces

IRDH275 / 375 / 575 series

Monitor the insulation resistance in all IT systems

the functional safety through automatic self monitoring

- System and earth connection - system functions

Signal

a drop in insulation resistance

- prewarning - main alarm

Inform

via plain LC text display- actual insulation resistance - system leakage capacitance

- faulty conductor (DC) - parameter values

IRDH275B / 375B / 575 seriesAdditional functions

Data memory

Historical memory to store alarm text messages with date and time

Communication

RS485 interface (BMS protocol)

Current output 0/4 .. . 20 mA

ISONET function For interconnection of several IT systems

Decoupling relays

IRDH575 seriesThe IRD575 series in combination with EDS47...-12 evaluators and

measuring current transformers can be extended to an automaticinsulation fault location system.

Location

Insulation faults in electrical installations with up to 708 subcircuits

No disconnection of the electrical installation

Information

Indication of the faulty subcircuit

Application fields

Industrial systems with variable-

speed drives

Power generation and distri-bution

Traffic engineering etc.

Technical features

Insulation monitoring with prewarning and

main alarm for universal use in all IT systems

Adjustable response value 1 k ...10 M

AMPPlus measuring principle for AC,DC and

AC/DC IT systems of up to 793 V,extendable via

coupling devices (not for IRDH575)

Monitoring of system functions,system and

earth connection

Automatic adaptation to system leakage

capacitances

Internal and external test and reset button

Illuminated plain text display:

2x 16 characters (IRDH275/375)

4x 16 characters (IRDH575)

Alarm LEDs

- prewarning

- main alarm

- system monitoring

additional features of IRDH575

- insulation fault location

- common alarm,fault located

Separately adjustable alarm relays in N/O and

N/C operation

RS485 interface (BMS protocol)

Panel mounting (optional) in IP 65 (IRDH375)

or in IP 42 (IRDH575)

DIN rail mounting (IRDH275)

Enclosure for installation into standard distri-bution panels

IRDH375 = 72 x 144 mm (H x B)

IRDH575 = 96 x 144 mm (H x B)

Industry Traffic engineering

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F U N C T I O N S A N D C H A R A C T E R I S T I C S A T A G L A N C E

Technical data

Right to modifications reserved!

Series

Type

Application field

Nominal voltage range UnFrequency range fn

System leakage capacitance Ce

Nominal voltage range Un (extendable)

Application

Main circuits AC,3(N) AC/DC

Control circuits AC/DC

Diode-decoupled systems

Interconnected IT systems

Response values/contacts

Number of response valuesResponse value

Contact main alarm

Contact prewarning

Contact (1 changeover contact)

Communication

Measured value display/parameter

Alarm LEDs

Function keys

RS485 interface

Current outputGeneral features

Measuring principle

Test/reset button

Fault memory

Indication faulty conductors L+/L-

Connection monitoring

Historical memory

Isometer disconnecting relays

Insulation fault location

Test current adjustableIndication

Evaluators

IRDH575

3(N)AC/DC 20 ...575 V/340 ...760 VDC 50 ...400 Hz

< 150 (500) F

--

x

x

x

x

21 k ...10 M

1 changeover contact

1 changeover contact

system fault/EDS alarm

four-line LC display

5

4

BMS protocol

0/4 ...20 mA

AMPPLUS

internal/external

x

x

system/PE

x

x

1 ...50 mAfaulty conductors

EDS470/473-12

IRDH375

3(N)AC 0 .. . 793 V, DC 0 ... 650 VDC 0.2 ... 400 Hz

< 150 (500) F

x

x

x

x

x

21 k ...10 M

1 changeover contact

1 changeover contact

system fault

two-line LC display

3

4

BMS protocol (B version)

0 ...400 A(0/4 ...20 mA B version)

AMPPLUS

internal/external

x

x

system/PE

B version

B version

----

--

IRDH275

3(N)AC 0 .. . 793 V, DC 0 ... 650 VDC 0.2 ... 400 Hz

< 150 (500) F

x

x

x

x

x

21 k . . . 10 M

1 changeover contact (or system fault)

1 changeover contact

--

two-line LC display

3

4

BMS protocol (B version)

0 ...400 A(0/4 ...20 mA B version)

AMPPLUS

internal/external

x

x

system/PE

B version

B version

----

--

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A SUMMARYIRDH 375 series

I RD H 3 75 B s eri es

IRDH 575 series

MONITORING insulation resistance in all ungrounded (IT) systems system and earth connection system functions functional safety due to automatic self monitoring

SIGNALLING A drop in insulation resistanceprewarning main alarm

INFORMATION

via LC text displaycurrent insulation resistance faulty conductor (DC polarity)system leakage capacitance parameter settings

DETECTING insulation fault location in electrical installations

with up to 708 sub circuits without disconnection of circuits

INFORMATION indication of the faulty sub circuit

DATA MEMORY historical memory to store alarm text messages with date and time

COMMUNICATION

RS485 interface (BMS protocol) current output 0/420mA

IT SYSTEM MANAGER automatic decoupling of Isometers in interconnected systems

The IRDH575 series in combination with EDS47..-12 evaluators andmeasuring current transformers can be extended to provide an

automatic insulation fault location system.

Additional functions:

OF THE FUNCTIONS

BENDER INC.700 Fox Chase Coatesville, PA 19320- USA

Toll-free:1-800-356-4266 Fax: 610-383-7100

E-Mail: info@benderrelay.com : www.bender r e lay .com

TECHNICALCHARACTERISTICStwo-step insulation monitoring for

universal use in all IT systems

adjustable response value1kOhm10 MOhm

AMPplus measuring principle forAC,DC and AC/DC IT systems up to690 V, extendable via couplingdevices

continuous monitoring of systemfunctions and system and earthconnection

automatic adaptation to systemleakage capacitances

internal and external test andreset button

illuminated LC text display: 2x16 characters (IRDH375)

4x16 characters (IRDH575)

alarm LEDs - IRDH 375- prewarning

main alarm

system monitoring

supplementary functions-IRDH575- insulation fault location

common alarm fault located

separately adjustable alarm relaysin N/O / N/C operation

RS485 interface

shock hazard protected terminalsfront plate mounting optional

cover for IP65

enclosure for installation intostandard distribution panels IRDH 375 =72x144 mm (HxW)

IRDH 575 = 96x144 mm (HxW)

Rights to modification reserved