CB6514B3AC5341
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Elektrotechnische Anlagen GmbH
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A standard fault-current circuit breaker (sensitive on peak currents) is not allowed
to be used as the only protective measure when using controller and power
feed/feedback unit Caused by a DC-component in the mains current a controller
with 3-phase input voltage may prevent a fault-current circuit breaker from tripping
in case of an earth fault. In accordance with VDE 0160 a fault-current circuit
breaker is not allowed to be used as the only protective measure. In dependence on
the kind of network (TN, IT, TT) further protective measures in accordance with
VDE 0100 part 410 are necessary. For a TN-network this may be an over current
protection, for an IT-network a insulation supervision with pulscode-measurment.
For all kind of networks protective insulation (-transformer) may be used, if re-
quired power and length of wires allow that. When selecting a fault current circuit
breaker the following measures have to be considered:
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The fault current circuit breaker has to be compliant with the VDE 0664 stan-
dard.
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The tripping current should be 300mA or more, to prevent a premature tripping
caused by the leakage current of the controller. In dependence on the load, the
length of the motor cables and the usage of a RFI-filter the leakage current may
even be much higher.
Fault current circuit breakers, which are sensitive to all kinds of leakage currents, grant
a good protection and are suitable as the only protection measurement for one ore three
phase controllers. The connection instructions of the manufacturer have to be observed.
