Bender A-Isometer IRDH 275, Operating Manual

Page: 10 / 76

Safety information
10 TGH1361en/11.2009
1.4 Directions for installation
The terminals and KE shall be connected by a separate wire to the pro-
tective conductor (PE). If the terminals L1, L2 of the device are connected to
a system under operation, the terminals
and KE must not be disconnect-
ed from the protective conductor (PE).
In order to check the proper connection of the device, it is recommended to
carry out a functional test using a genuine earth fault, e.g. via a suitable re-
sistance, before starting the A-ISOMETER
® .
The devices, variant -4.. are delivered with the following factory setting:
Please check if the basic setting of the A-ISOMETER ® complies with the re-
quirements of the system to be monitored.
Only one insulation monitoring device may be used in each intercon-
nected IT system.
When insulation or voltage test are to be carried out, the device shall
be isolated from the system for the test period.
ISO SETUP:
Alarm 1 / Alarm 2
(response values) = 40 k
Ω
/ 10 k
Ω
ISO SETUP: Operating principle K1/K2 = N/O operation
ISO SETUP: Memory = off
ISO ADVANCED: System leakage capacitance = 150 μF
COM SETUP: Bus address = 3 (slave)
When an AC system includes galvanically connected DC circuits, the
following shall be considered:
Insulation faults in DC circuits can only be monitored correctly when
the rectifiers carry a continuous load of 5...10 mA.