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Connecting control cabling
Connect the conductors to the appropriate terminals. Refer to the wiring diagrams
delivered with the drive.
Obey these instructions:
•
Connect the inner twisted pair shields and all separate grounding wires to the
grounding clamps near the terminals.
•
Ground the outer shield of the cable at the cable entry, not at the grounding clamps
near the terminals.
•
Keep any signal wire pairs twisted as close to the terminals as possible. Twisting
the wire with its return wire reduces disturbances caused by inductive coupling.
•
At the other end of the cable, leave the shields unconnected or ground them
indirectly via a high-frequency capacitor with a few nanofarads, eg. 3.3 nF / 630 V.
The shield can also be grounded directly at both ends if they are in the same
ground line with no significant voltage drop between the end points.
The drawing below represents the grounding of the control cabling when connecting
to a terminal block inside the cabinet. The grounding is done in the same way when
connecting directly to a component such as the control unit.
Electrical installation 67
11
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