43
Cabling Instructions
Power Cables
The mains and motor cables must be dimensioned according to local regulations
and:
1.)
to carry the DCS800-A load current.
2.)
for at least 60°C (140°F).
3.)
to fulfill short-circuit protection.
4.)
the inductance and impedance of the cable must be rated according
permissible touch voltage appearing under fault conditions (so that the fault
point voltage will not rise too high when an earth fault occurs).
5.)
the cable screens according to safety regulations.
Control / Signal Cables
The cables for digital signals, which are longer than 3 m and all cables for analogue
signals, must be screened. Each screen must be connected at both ends by metal
clamps (see
Connection of a cable screen with the aid of metal clamp to the metal
) or comparable means directly on clean metal surfaces, if both earthing
points belong to the same earth line. Otherwise a capacitor (e.g. 3.3 nF / 3000 V)
must be connected to earth on one end. In the converter cabinet this kind of
connection must be made directly on the sheet metal close to the terminals (see
Connection example in accordance with EMC
➂
) and if the cable comes from
outside also on the PE bar (see
Connection example in accordance with EMC
④
).
At the other end of the cable the screen must be well connected with the housing of
the signal emitter or receiver.
Connection of a cable screen with the aid of metal clamp to the metal surface
Electrical Installation
3ADW000352R0101 DCS800-A Installation Manual e a