56 Planning the electrical installation
Selecting the control cables
All control cables must be shielded.
Use a double-shielded twisted-pair cable (Figure a) for analogue signals. This type of
cable is recommended for the pulse encoder signals also. Employ one individually
shielded pair for each signal. Do not use common return for different analogue
signals.
A double-shielded twisted-pair cable is the best alternative for low-voltage digital
signals but single-shielded twisted-pair cable (Figure b) is also usable.
Run analogue and digital signals in separate, shielded cables.
Relay-controlled signals, providing their voltage does not exceed 48 V, can be run in
the same cables as digital input signals. It is recommended that the relay-controlled
signals be run as twisted pairs.
Never mix 24 V DC and 115/230 V AC signals in the same cable.
Relay cable
The cable type with braided metallic screen (for example, ÖLFLEX by LAPPKABEL,
Germany) has been tested and approved by ABB.
Control panel cable
In remote use, the cable connecting the control panel to the drive must not exceed
3 m (10 ft). The cable type tested and approved by ABB is used in control panel
option kits.
a
A double-shielded
twisted pair cable
b
A single-shielded twisted
pair cable
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