Electrical installation
Page 105
DANGER!
For safety reasons, all PE ground conductors must be connected prior to initial operation.
The EN 61800-5-1 regulations for protective earthing must be complied with during installation!
8.11.5
Operation with long motor cables
Compliance with the EMC standard EN 61800-3 is only guaranteed for motor cable lengths of up to 25 m. For
cable lengths beyond this a new measurement of the interference emission may possibly be required.
In applications involving long motor cables and/or unsuitable motor cables with an inadvertently high cable capacity, the filters
may be thermally overloaded. To avoid such problems we highly recommend the following procedure for applications that
require long motor cables:
With cable lengths of more than 25 m use only cables with a capacitance per unit length between the motor phase and the
shield of less than 150 pF/m!
(Please contact the motor cable supplier, if necessary)
For motor cable lengths of more than 25 m and up to 50 m the following derating applies regardless of the EMC
qualification (see also
Table 7, Technical data: Cable specifications
PWM frequency
up to 5 kHz
5,5 kHz
6 kHz
7 kHz
8 kHz
Max. motor cable length
50 m
45 m
40 m
35 m
30 m
