Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Cabling
Guidance
2-8
2
2.5.2 Cable routing
230 V supply lines and signal lines must be laid in separate cables with a mini-
mum distance of 10 cm. It is also advisable to ensure a spatial separation of the
mains and signal lines within the control cabinet
Digital signal lines / bus lines and analog signal lines / sensor lines must be laid in
separate cables
It is recommended to use shielded cables for the analog signal cables
The shield must be earthed at the control cabinet entry or exit point. The shields
must be laid with the shortest route and with the largest possible cross section.
The central earthing point is to be connected to the protective conductor PE
by >10 mm² by the shortest route
As a rule, the shield is only placed on one side of the control cabinet, unless there
is an equipotential bonding, which has much lower impedance than the shield
resistance
Inductors installed in the same cabinet, e.g. contactor coils must be provided with
suitable interference suppression circuits (RC elements)
Controlcabinetpartswithhigheldstrengths,e.g.transformersorfrequency
inverters should be shielded with dividing plates that have a good ground con-
nection.
2.5.3 Overvoltage protection for long distances or external cables
If cables are laid outside the building or over longer distances, suitable overvoltage
protection measures must be provided. Especially with bus cables, these
measures are indispensable.
In the case of cables laid outside, the shield must be current-carrying and
grounded on both sides.
The surge arresters must be installed at the entrance to the control cabinet input.
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