Operating & Mounting instructions – 8 074 143.03/03 – Page 72
Remarks to the inverter output side
Motor cable lengths
The distances between inverter and motor indicated in the table in the chapter "CE-DR Options" must
be complied with. Too long motor cables can damage the inverters!
Option: AMF (output motor filter)
To reduce the voltage rate of rise on the inverter output and the effects on parallel lines thus possi-
ble, it is of advantage to use the AMF.
With long motor cables, the AMF protects the inverter and motor, and is absolutely imperative. See
table "Allocation Inverter Options Motor Cable Motor".
Especially with multimotor drives and the respective parallel motor cables, non-compliance with the
cable lengths can lead to destruction of the inverter.
Compensation capacitors
Compensation capacitors, mains filters and overvoltage protection equipment must never be
connected to the output of the inverters !!!
Switching at the inverter’s output
Operational switching between the inverter and the motor is not permissible. This would cause stress
load on the power semiconductor, and possible safety shut-down of the inverter !! This would shorten
the inverter's life !!!
Exception: A revision switch that is only used in very rare cases. Here, too, the CX should be
locked first, if possible (digital input programmed to 11 FRS "Impulse lock - idle").
Change of direction
Reversal protection switches for change in direction must not be used (see "Switching at the inverter's
output"). In order to change the direction of rotation, a digital input on the control terminal strip or a
parameter for direction selection (parameter F004) is provided.
Note:
Too long motor cables may damage the inverter.
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