External control unit 107
Connecting the control cables to the terminals of the
control unit
1. Route the cables to the control unit as shown below.
2. Ground the shields of the control cables at the clamp plate. The shields should be
continuous as close to the terminals of the control unit as possible. Only remove the
outer jacket of the cable at the cable clamp so that the clamp presses on the bare
shield. The shield (especially in case of multiple shields) can also be terminated with a
lug and fastened with a screw at the clamp plate. Leave the other end of the shield
unconnected or ground it indirectly via a few nanofarads high-frequency capacitor, 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.Tighten the
screws to secure the connection.
3. Connect the conductors to the appropriate detachable terminals of the control unit,
see page 108. Use shrink tubing or insulating tape to contain any stray strands.
Note: 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.
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