Connecting the control cables to the terminals of the
external control unit
1. Route the cables to the control unit as shown below. Use torque 1.5 N·m (13 lbf·in).
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
the default I/O diagram. Use shrink tubing or insulating tape to contain any strain 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. Keep
the shields continuous as close to the terminals of the control unit as possible.
Connecting a control panel
With control panel door mounting platform, connect the control panel as follows:
1. Connect an Ethernet cable to the RJ-45 connector of the control panel.
2. Connect the other end of the cable to the X13 connector of the control unit.
Electrical installation 109
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