Safety information
14 Operating instructions RLD
ELTROPLAN
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REVCON
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 feedback unit
Caused by a DC-component in the mains current a controller with 3-phase input volt-
age 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) fur-
ther 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 an insulation
supervision with pulscode-measurment. For all kind of networks protective insulation
(-transformer) may be used, if required power and length of wires allow that. When se-
lecting 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.
