Wiring the 24 V connections with redundant configuration with 2 x IM 650
NOTICE
Property damage resulting from short-circuit
If, in a configuration for redundancy, you incorrectly connect the supply voltage L+ when wiring
to the IM 650, this brings about a short-circuit via the ground terminal.
Reason: The two IM 650 modules have a shared ground cable via the BM IM/IM bus module.
● In configurations with ungrounded reference potential (jumper between M and functional
ground removed, see figure in section "Configuration of the ET 200PA SMART with
ungrounded reference potential (Page 27)"), in the case of a polarity reversal an internal
electronic fuse trips, which regenerates after approx. 30 seconds.
● In configurations with grounded reference potential (jumper plugged between M and
functional earth), in the case of a polarity reversal a short-circuit current results via this
jumper and the functional ground.
In doing so, the IM 650 is not damaged if a fuse designed in accordance with the cross-
section of the connection cable is installed before the module.
Wiring the power supply and IM 650 with connecting comb
In order to wire the power supply module and IM 650, proceed as follows (refer to the following
figure):
WARNING
Wiring only in de-energized state
Electric shock may result in death or bodily injury.
There is a risk of contacting live wires if the power supply module and any additional load
current supplies are connected to the supply system.
Therefore, only wire the ET 200PA SMART in de-energized state.
1. Open the front doors of the PS 307 and the IM 650.
2. Undo the strain relief clamp on the PS 307.
3. Strip the isolation from the power cable (230 V / 120 V) and connect this to the PS 307.
4. Screw the strain relief clamp in place again.
Connecting
4.3 Wiring the power supply and modules
ET 200PA SMART
44 Operating Instructions, 06/2019, A5E34192013-AB
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