Planning the electrical installation 39
A double-shielded cable is the best alternative for low-voltage digital signals, but a
single-shielded or unshielded twisted multipair cable (Figure b) is also usable.
However, for frequency input, always use a shielded cable.
Run analog 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 are 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)
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.
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 are installed on separate trays. Avoid
long parallel runs of motor cables with other cables to decrease electromagnetic
interference caused by the rapid changes in the drive output voltage.
Where control cables must cross power cables make sure that they are arranged at
an angle as near to 90 degrees as possible.
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.
Double-shielded twisted
multipair cable
Single-shielded twisted
multipair cable
a
b
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
+86-755-8660-6182
