Safety information
Operating instructions SVCD(S)
13
123456278
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419A58
Elektrotechnische Anlagen GmbH
1
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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 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 a 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 nec-
essary. 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 protec-
tive insulation (-transformer) may be used, if required power and length of wires al-
low 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 standard.
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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.
