Guidelines for planning the electrical installation 67
A double-shielded cable (figure a below) is the best alternative for low-voltage digital
signals but single-shielded (b) twisted pair cable is also acceptable.
Signals in separate cables
Run analog and digital signals in separate, shielded cables. Never mix 24 V DC and
115/230 V AC signals in the same cable.
Signals allowed to be run in the same cable
Relay-controlled signals, providing their voltage does not exceed 48 V, can be run in the
same cables as digital input signals. The relay-controlled signals should be run as twisted
pairs.
Relay cable type
The cable type with braided metallic screen (for example ÖLFLEX by LAPPKABEL,
Germany) has been tested and approved by ABB.
Control panel cable length and type
In remote use, the cable connecting the control panel to the drive must not exceed three
meters (10 ft). Cable type: shielded CAT 5e or better Ethernet patch cable with RJ-45
ends.
Routing the cables
Route the motor cable away from other cable routes. Motor cables of several drives can be
run in parallel when installed next to each other. The motor cable, input power cable and
control cables should 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 install extra cables through the drive.
The cable trays must have good electrical bonding to each other and to the grounding
electrodes. Aluminum tray systems can be used to improve local equalizing of potential
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