Langmatz EK 533, Руководство по эксплуатации

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4.7 Return conductor options
In the delivery state, all functions are operated via a return conductor (neutral conductor) (case 1).
In certain cases, e.g. in the event of mixed voltages or monitored signal cables, the corresponding
return conductors can be disconnected if required.
The following functions can be disconnected:
- Green signalling
- Optical feedback
- Supply voltage with optional control inputs