benderIRDH575 Series

6 - 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

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

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.