Lenze E94MHE Serie Instructions De Montage page 64

6 Wiring the device
Important notes
Earthing of internal EMC filters
(
Stop!
Overvoltage on components:
In case of an earth fault in IT systems, incompatible overvoltages may occur in
the plant.
Possible consequences:
Destruction of the device.
Protective measures:
When using the devices in IT systems, separate the internal connection of
filters to the protective earth. For this purpose carry out the device−specific
measure as described.
Device−internal EMC filters have been implemented to reduce interference emission.
These EMC filters are connected to protective earth to discharge interference currents.
Under certain conditions the EMC filters must be disconnected from:
Operation in an IT system
ƒ
The devices are protected from damages or destruction due to incompatible
overvoltages in the case of an error (earth fault).
DC−bus operation
ƒ
Operation with power supply modules or regenerative power supply modules
ƒ
Operating multiple devices with a common filter
ƒ
The EMC properties can only be reached by carrying out the described measures.
The triggering behaviour of applicable earth−leakage circuit breakers remains
undisturbed.
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EDK94MH594 DE/EN/FR/ES/IT 3.0