General Information Regarding the Wiring
17.2.1 Motor Cable
DANGER
Dangerous shock currents
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 disturb-
ing ground loops and malfunction of the motor.
→ The described measures prevent disturbing ground loops.
→ Connect the protective earth conductors additionally led in motor cables directly to
the shield line and label them with 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 ca-
bles..
→ Ensure to return the cable to the drive! Do not wire the cable with another ground
loop.
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 addition,
the motor cable should be as short as possible to reduce electromagnetic radiation and
capacitive currents.
Fig. 94: Motor connection
Fig. 94: Motor connection
Requirements to the motor cable
The maximum admissible length of the motor cable is 100 m. The capacity must not ex-
ceed 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.
170 Drive System SD2 - Hardware Description
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