Operation and setting
53
IRDH275_D00122_02_M_XXEN/10.2016
6.4.3 Memory setting (on/off)
Memory: on = Fault memory is activated
The device must be reset with the RESET button after
clearing the fault.
Memory: off = Fault memory deactivated (factory setting)
6.4.4 Current output for external measuring instruments
(IRDH275B)
Factory setting: 0…20 mA
The current output of the IRDH275 can be set to "0…20 mA" or "4…20 mA" via
the menu point "M+/M-:". The maximum load is 500 Ω.
Function 0…20 mA:
R
F
= insulation fault, I= current in mA
Function 4…20 mA:
R
F
= insulation fault, I= current in mA
The associated characteristic curves are illustrated on page 81.
During the automatic self test, the alarm relays are not
switched over.
When a device fault occurs at the ISOMETER®, the relay K2
will automatically be activated as a device fault relay.
R
F
=
20 mA x 120 kW
I
- 120 kW
R
F
=
16 mA x 120 kW
I - 4 mA
- 120 kW
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