NOTICE
Disturbing ground loops
Incorrect connection of protective earth connections in motor cables may cause
disturbing ground loops and malfunction of the motor.
Connect the protective earth conductors additionally led in motor cables directly to
the shield line and label them with T or PE.
If the procedure turns out to be impracticable, omit the earth conductor connection
in the motor cables and wire a separate earth conductor in parallel to the motor
cables.
Ensure that the cable is returned to the drive! Do not wire the cable with another
ground loop.
✔ The described measures prevent disturbing ground loops.
Use shielded cables for the motor in order to keep interference as low as possible.
The cable shield must be connected large-area with 360° shield termination. In addi‐
tion, the motor cable should be as short as possible to reduce electromagnetic radia‐
tion and capacitive currents.
Fig. 11: Motor connection
Requirements to the motor cable
The maximum admissible length of the motor cable is 100 m. The capacity must not
exceed 5.2 nF.
Example: If the cable capacity is 0.26 nF per meter, the maximum admissible length of
the motor cable is 20 m.
General Information Regarding the Wiring
W
70 Drive Amplifier SD2B / SD2B plus - Hardware Description
11
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