Bender A-Isometer IRDH 275, Operating Manual

Page: 42 / 76

Operation and setting
42 TGH1361en/11.2009
5.4.3 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)
5.4.4 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 66.
During the automatic self test, the alarm relays are not switched
over.
When a device fault occurs at the A-ISOMETER ®, the relay K2 will au-
tomatically be activated as a device fault relay.
R
F
=
20 mA x 120 k W
I
- 120 k W
R
F
=
16 mA x 120 k W
I - 4 mA
- 120 k W