Planning the electrical installation
45
Double-shielded cable is the best alternative for low-voltage digital signals but
single-shielded twisted multipair cable (Figure b) is also usable.
Run analogue and digital signals in separate 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 VDC and 115/230 VAC signals in the same cable.
Relay cable
The cable type with braided metallic screen (e.g. ÖLFLEX by Lapp Kabel, Germany)
has been tested and approved by ABB.
Control panel cable
The cable connecting the control panel to the drive must not exceed 3 metres in
length. The cable type tested and approved by ABB is used in control panel option
kits.
Connection of a motor temperature sensor to the drive I/O
See page 60.
Routing the cables
Route the motor cable away from other cable routes. Motor cables of several drives
can be run in parallel installed next to each other. It is recommended that the motor
cable, input power cable and control cables be installed on separate trays. Avoid
long parallel runs of motor cables with other cables in order to decrease
electromagnetic interference caused by the rapid changes in the drive output
voltage.
Where control cables must cross power cables make sure they are arranged at an
angle as near to 90 degrees as possible. Do not run extra cables through the drive.
The cable trays must have good electrical bonding to each other and to the
grounding electrodes. Aluminium tray systems can be used to improve local
equalizing of potential.
a
Double-shielded twisted
pair cable
b
Single-shielded twisted
multipair cable
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