1.4
Directions for installation
I
CAUTION!
Ensure disconnection from the IT system!
Only one insulation monitoring device
may be used in each interconnected IT system.
When insulation or voltage tests are to be carried out, the device must be isolated from the sys-
tem for the test period.
I
CAUTION!
Connect terminals
and KE separately to PE! The
terminals
and KE shall
be connected by a separate wire to the protective conductor (PE). If the terminals L1, L2 of the
device are connected to a system under operation, the terminals
and KE must not be
disconnected 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 insulation fault
R
F
, e.g. via a suitable resistance.
The device variant -4… is delivered with the following factory setting:
ISO SETUP:
Alarm 1/Alarm 2
= 40 kΩ/10 kΩ
ISO SETUP:
Operating mode K1/K2
= N/O operation
ISO SETUP:
Memory
= off
Please check if the basic setting of the ISOMETER® complies with the requirements of the system
to be monitored.
i
When an AC system being monitored contains galvanically coupled DC circuits:
An insulation fault can only be monitored correctly when the rectifiers carry a
continuous load current of 5…10 mA.
IR1575H_D00416_00_M_XXEN / 03.2021 7
ISOMETER® IR1575H
