11.2.1
Motor Cable
DANGER
Dangerous shock currents
Earthing and shielding measures are required to protect devices and persons. To
ensure the safety of the operator earthing must be carried out with low impedance.
With respect to the ground connection one of the following actions must be done:
▶
connect the motor housing to the ground of the machine or
▶
connect the ground terminal of the motor connector to the central ground point
of the machine.
Consider the following with regard to shielding: Always use shielded motor cables.
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. 8: Motor connection
General Information Regarding the Wiring
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