Mounting and connection
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isoxx1685Dx-x25_D00272_07_M_XXEN/09.2022
5.2.2 Step-by-step connection of the ISOMETER®
Connect the device according to the wiring diagram.
Proceed as follows:
1. Connect terminals E and KE to earth (PE)
2. Connect terminals A and B to the BMS bus
3. Connect terminal S to the bus conductor shield
(only at one end of the conductor)
4. Connect terminal L1/+ to L1 of the system to be monitored
5. Connect terminal L2/– to L2 of the system to be monitored
6. Connect terminal A1/A2 to the supply voltage U
s
7. Connect alarm outputs 11/12/14, 21/22/24 and 31/32/34.
Ensure disconnection from the IT system!
When insulation or voltage tests are to be carried out, the device must be
isolated from the system for the test period. Otherwise the device may be
damaged.
Check proper connection!
Prior to commissioning of the installation, check that the device has been
properly connected and check the device functions. Perform a functional test
using an earth fault via a suitable resistance.
Pluggable push-wire terminals
All terminals are pluggable push-wire terminals. Solid connecting wires can
be directly plugged in. For connection of flexible cables, the push-wire
terminals must be pushed open by pressing the corresponding orange
interlocking mechanism with a flat-head screwdriver.
The coupling terminals L1/+ and L2/- are locked. To unplug the terminals, the
orange sliders must be slid towards the front (towards the device) to unlock
the terminal. Now the terminal can be unplugged.
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