Setup without electrical isolation
FE
PE
Power supply unit
24 V
Separable
connections
Overvoltage category I, 24 V
0 V
Fig. 14: Structure of the supply voltage
Control does not start in case of reverse input voltage.
The 24 V feeding U
L
and U
P
at the XD10 connector is protected against polarity reversal. A
polarity reversal of U
L
and GND U
L
feeding as well as U
P
and GND U
P
feeding does not damage
the device. However, the control does not start and the status displays are not on.
Setup with electrical isolation
Provide electrical isolation between the logic supply U
L
and the periphery supply U
P
of the I/O terminals
acc. to DIN EN 60204-1. Accordingly, the voltage U
L
(24 V logic voltage) at the control is electrically
isolated from the periphery voltages U
P
(24 V segment voltage).
FE
PE
supply unit
Separable
connections
Overvoltage category I, 24 V
Load
supply unit
24 V
0 V
24 V
0 V
Logic
Fig. 15: Structure of the supply voltage
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