39
cONNecTION Of THe POWer UNIT
4.2.4.2 Cable-feed 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
Max. motor line length shielded
max. leakage
current
(at
f
N
=50-60 Hz)
in accordance with eN 61800-3
category c1
category c2
Motor cable
(standard)
Motor cable (low
capacitance)
Motor cable
(standard)
Motor cable (low
capacitance)
07
25 m
50 m
50 m
100 m
< 5 mA
09
10
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. Mo
-
tor chokes or filters are absolutely necessary upto 100 m.
4.2.4.3 Motor line length at operation with DC voltage
The maximum motor line length at DC operation is basically dependent on the capacity
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
Motor cable (standard)
Motor cable (low capacitance)
07
25 m
50 m
09
10
4.2.4.4 Motor cable length for parallel operation of motors
The resulting motor cable length for parallel operation of motors, or parallel installation
with multiple cables arises from the following formula:
resulting motor cable length = ∑single line length x √
Number of motor lines
4.2.4.5 Motor cable cross-section
The conductor cross-section of the motor cable is dependent on the output current, the
cable according to manufacturer's data, as well as the VDE regulations.
4.2.4.6 Interconnection of the motor
NOTICE
The connecting-up instructions of the motor manufacturer are always
generally valid.
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