3 Electrical Installation
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3) For the multicore cable, it is recommended that a cable transmit the same type of
signals. If a cable is used to transmit dierent types of signals, use the cable with
conductor shielded, as shown in the following gure:
Power + Analog Digital + Relay contact
Power signal
Relay contact signal
Digital + Analog
Shield
Power + Relay contact
Digital signal
Analog signal
Figure 3-5 Routing of multicore cables
4) When certain conductors in a multicore cable are not used, connect all the unused
(or reserved) conductors to the equipotential connection point.
device
Equipotential
disconnected
Equipotential metal plate
device
Equipotential metal plate
Figure 3-6 Handling of remaining cores in multicore cable
5) For the low-level sensor signals and relay signals with a common, lay the two
cables close to each other, preventing too large loop area.
Make sure to use the twisted pair for the analog signal.
Lay the digital signal cables close to each other.
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