Planning the electrical installation 39
Selecting the control cables
It is recommended that all control cables are shielded.
Double-shielded twisted pair cable is recommended for analog signals. For pulse
encoder cabling, follow the instructions given by the encoder manufacturer. Use one
individually-shielded pair for each signal. Do not use a common return for different
analog signals.
Double-shielded cable is best for low-voltage digital signals but single-shielded
twisted multi-pair cable (Figure b) may also be used.
Run the analog signal and digital signals in separate cables.
Relay-controlled signals, providing their voltage does not exceed 48 V, may 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.
Connection of a motor temperature sensor to the drive I/O
See Thermal switch connection on page 57.
Routing the cables
Route the motor cable away from other cable routes. Motor cables of several drives
may 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.
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