8. Lift the control unit onto the mounting screws. Tighten the screws.
9. Attach the optional modules.
10. 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.
11. Connect the conductors to the appropriate detachable terminals of the control unit. See
the default I/O diagram in chapter Control unit (page 111). Use shrink tubing or insulating
tape to contain any stray strands. Tighten the screws to secure the connection.
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.
External control unit (option +P906) 129
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