8. Ground the outer shield of the cable 360 degrees under the grounding clamp.
Keep the cable unstripped as close to the terminals of the control unit as
possible.
Frames R5…R9: Secure the cables mechanically at the clamps below the control
unit.
If you use double-shielded cables, ground also the pair-cable shields and
grounding wire at the SCR terminal.
9. Route the cable as shown in the figures for frames R1…R2 and R3 (page 161),
R4 (page 162), R5 (page 163) and R6…R9 (page 164).
10. Connect the conductors to the appropriate terminals of the control unit and
tighten to 0.5…0.6 N·m (0.4 lbf·ft).
11. Tie all control cables to the provided cable tie mounts.
Note:
• Leave the other ends of the control cable 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.
• 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.
160 Electrical installation – Global (IEC)
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