38 Unidrive M702 Getting Started Guide
Issue Number: 4
4.7 Communications connections
The drive offers Ethernet fieldbus communications. This enables the drive set-up, operation and
monitoring to be carried out with a PC or controller if required.
The drive provides two RJ45 connections with an Ethernet switch for easy network creation.
4.8 Shield connections
The following guidelines should be followed to ensure suppression of radio-frequency
emission and good noise immunity. It is particularly recommended that the guidelines for the
encoder cable be followed closely in order to avoid disturbance to the encoder operation from
electrical noise. Use the grounding bracket and grounding clamp supplied with the drive to terminate
the shields at the drive.
Figure 4-8 Grounding of signal cable shields using the grounding bracket
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 50 mm
(2 in) 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 4-9. 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 the Drive 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.
Unidrive M702 Getting Started Guide English iss3.book Page 38 Friday, August 29, 2014 2:33 PM
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