User guide

38 Unidrive SP Short Form Guide
www.controltechniques.com Issue Number: 2
Motor cable: use a motor cable with an overall shield. Connect the shield of the motor
cable to the ground terminal of the motor frame using a link that is as short as possible
and not exceeding 50mm (2in) long. A full 360° termination of the shield to the terminal
housing of the motor is beneficial.
Encoder cable: for best shielding use cable with an overall shield and individual shields
on twisted pairs, connect the cable as illustrated in Figure 4-12. Clamp the overall shield
to grounded metallic surfaces at both the encoder and the drive.
Brake resistor cable: the optional braking resistor should also be wired with shielded
cable. If unshielded wire is required refer to Unidrive SP User Guide for guidance.
Control cables: if the control wiring is to leave the enclosure, it must be shielded and
the shield(s) clamped to the drive using the grounding bracket. Remove the outer
insulating cover of the cable to ensure the shield(s) make contact with the bracket, but
keep the shield(s) intact until as close as possible to the terminals.
Figure 4-12 Feedback cable shield connections
Cable
Cable
shield
Twisted
pair
shield
Cable
shield
Twisted
pair
shield
Connection
at motor
Connection
at drive
Ground clamp
on shield
Shield
connection
to 0V
Shield
connection
to 0V