Electrical installation
71
Connecting the cables to the I/O terminals
Connect the conductors to the appropriate detachable terminals of the RMIO board
or optional terminal X2 [see chapter Motor control and I/O board (RMIO)]. Tighten
the screws to secure the connection.
Single-shielded cable:
Twist the grounding wires of the outer shield and connect
them to the nearest grounding clamp. Double-shielded cable
: Connect the inner
shields and the grounding wires of the outer shield to the nearest grounding clamp.
Do not connect shields of different cables to the same grounding clamp.
Leave the other end of the shield unconnected or ground it indirectly via a few
nanofarads high-frequency capacitor (for example, 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 the 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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