benderIRDH575 SeriesDigital Ground Fault Monitor / Ground Detector Controller for Ground Fault Location System Ungrounded (Floating) AC/DC Systems

for ground fault location system. AUTO indicates location system is activated automatically when IRDH575 goes into alarm. 

System may also be set manually on or off.

16 - Polarity of the test current pulse. Point = valid BMS traffic,

H = A new entry has been made in the history.

17 - Text indicating state of device

18 - Analog output: 0…20 mA or 4…20 mA (selectable)

19 - External test button (N/D contact)

20 - External reset button (N/E contact or wire jumper). When the 

terminals are open, the device will reset automatically.

21 - STANDBY contacts. When the contacts are closed, the device 

is forced into standby mode and will not send out a measurement signal.

22 - RS-485 termination (120 Ω) with micro switch S1 and connection 

BMS bus; S1 = ON = BMS bus terminated, S2 = unassigned

23 - Alarm relay: Alarm 1 (A-ISOMETER®)

24 - Alarm relay: Alarm 2 (A-ISOMETER®)

25 - Alarm relay: System fault and EDS alarm (Adr.:1)

1 - A-ISOMETER® IRDH575

2 - RS-485/BMS protocol

3 - EDS460/EDS461

4 - EDS3090/EDS3091

Example: IRDH575 with EDS460 (main circuits)

EDS460 system with IRDH575, EDS460 and measuring current 

transformers W… in a three-phase AC system

1 - 3AC/3NAC/AC 20…575 V

2 - US

 see ordering information, 6 A fuse recommended.

3 - Current transformers, W series

4 - Loads

5 - A-ISOMETER® IRDH575

6 - Ground fault location device EDS460

Example: IRDH575 with EDS461 (control circuits)

1 - DC 20 V…308 V

2 - US

 see ordering information, 6 A fuse recommended.

3 - Current transformers, W…/8000 series

4 - Load PLC

5 - A-ISOMETER® IRDH575

6 - Ground fault location device EDS461

Design of an EDS461 system

The above example shows an EDS461 device being fed by a PLC 

in a DC system. Using an EDS461 device is recommended for PLC 

inputs due to the sensitivity required.