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CONNECTION OF THE POWER UNIT
4.2.5.3 Motor cable length at operation with DC voltage
The maximum motor cable length at DC operation is basically dependent on the capaci-
tyofthemotorcable.TheinternallterisnotactiveatDCoperation.Externalmeasures
must be taken here, if necessary. The following data apply for operation under rated
conditions.
Size
Motor cable / m
(standard)
Motor cable / m
(low-capacitance)
13
25 5014
15
Table 10: Motor cable length at operation with DC voltage
4.2.5.4 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:
Resultingmotorcablelength=∑singlecablelengthsx√Number of motor cables
4.2.5.5 Motor cable cross-section
The motor cable cross-section is dependent
• on the kind of the output current (e.g. not sinusoidal).
• ontherealeectivevalueofthemotorcurrent.
• on the cable length.
• on the type of the used cable.
• on environmental conditions such as bundling and temperature.
4.2.5.6 Interconnection of the motor
NOTICE
Faulty behaviour of the motor !
The connecting-up instructions of the motor manufacturer are always
generally valid !
NOTICE
Protect motor against voltage peaks !
DrivecontrollersswitchattheoutputwithdV/dt≤5kV/µs.
Voltage peaks
that endanger the insulation system at the motor can occur especially
in case of long motor cables (> 15 m).
Amotorchoke,adv/dt-lterorsine-waveltercanbeusedforprotec-
tion of the motor.
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