Instruction Manual

Electrical installation
Important notes
6
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155
EDS84ASC552 EN 9.1
 Stop!
Use of RFI filters in IT systems
The c ontrollers must not be operated with mains filters and RFI filters from
Lenze because these filters contain components connected to PE.
Possible consequences:
ƒ The filters may be destroyed when an earth fault occurs.
ƒ Monitoring of the IT system may be triggered.
Protective measures:
ƒ Do not use RFI filters from Lenze in IT systems.
ƒ Before using the controller in IT systems, remove the two contact screws for
interference suppression (on the supply side and on the motor side).
 Stop!
Overvoltage at components:
In case of an earth fault in IT systems, intolerable overvoltages may occur in
the plant.
Possible consequences:
Destruction of the device.
Protective measures:
Before using the controller in the IT system, remove the contact screws on the
supplysideandthemotorside.( Fig. 6-14).
 Note!
Switching on the controller motor side is permissible for safety shutdown
(emergency stop) and for operation of several motor on the controller (only in
V/f operating mode!).
Please observe the following:
ƒ When switching with the controller enabled, you can activate monitoring
functions o f the controller. If no monitoring function is activated, switching
is permissible.
ƒ The switching elements on the motor side must be dimensioned in
accordance with the maximum occurring load.