Function
20
IRDH375_D00124_05_M_XXEN/01.2020
3.2 Additional characteristics IRDH375B
Memory with real-time clock to store all alarm messages with date and
time stamp.
BMS interface (BMS protocol) for data exchange with other Bender
devices (RS-485 electrically isolated).
Internal disconnection of the ISOMETER from the IT system to be moni-
tored (using a control signal; terminals F1/F2) , e.g. if several
ISOMETER®s are interconnected.
Current output 0(4)…20 mA (galvanically separated) in relation to the
measured insulation value.
Remote setting of certain parameters via the Internet (option; COM465
additionally required)
3.3 Product description
The ISOMETER® type IRDH375 monitors the insulation resistance of IT systems.
It is suitable for universal use in 3NAC, AC/DC and DC systems. AC systems
may include extensive DC supplied loads, such as converters or thyristor-con-
trolled DC drives. The device automatically adapts itself to the existing system
leakage capacitance.
Suitable coupling devices are available to extend the nominal voltage range
U
n
.
The IRDH375B can be used in combination with a control and indicating de-
vice, e.g. PRC1470 version 2 or higher, on the BMS (BMS = Bender Measuring
Device Interface) bus.
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