Connection Of The Motor; Selection Of The Motor Cable; Cable-Fed Disturbances Depending On The Motor Line Length At Ac Supply; Motor Line Length At Operation With Dc Voltage - KEB COMBIVERT S6 Instructions For Use Manual

cONNecTION Of THe POWer UNIT

4.2.5 connection of the motor

4.2.5.1 Selection of the motor cable

The correct cabling as well as the motor cable plays an important part in case of low
power in connection with long motor cable lengths. Ferrite cores and low-capacitance
cables (phase/phase<65 pF/m, phase/screen<120 pF/m) at the output have the follow-
ing effects:
•
•
•

4.2.5.2 Cable-fed disturbances depending on the motor line length at AC supply

The maximum motor line length is depending on the capacity of the motor cable as well
as on the EMC emitted interference. The following data apply for operation under nom-
inal rating conditions.
Size
Table 23:

4.2.5.3 Motor line length at operation with DC voltage

The maximum motor cable length at DC operation is basically dependent on the capaci-
ty of the motor cable. The internal filter is not active at DC operation. External measures
must be taken here, if necessary. The following data apply for operation under nominal
rating conditions.
Size
Table 24:
46
longer motor line lengths
less abrasion of the motor gearbox by leakage currents
better EMC properties (reduction of the common-mode output currents to earth)
Max. motor cable length shielded
in accordance with
Motor cable (low-capacitance)
12
13
14
Maximum motor cable length at AC supply
The line length can be extend significant by using motor chokes or filters. KEB
recommends the use of motor chokes or filters for a line length upto 50 m. Motor
chokes or filters are absolutely necessary upto 100 m.
12
13
14
Motor cable length at DC operation
EN 61800-3
category c2
100 m
Motor cable (low-capacitance)
50 m
max. leakage cur-
rent
(at f ≤ 100 Hz)
N
< 5 mA