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.
154 External control unit (option +P906)
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