Encoder Connections; Serial Communications Connections; Screen Connections - Control Techniques UNIDRIVE SP1201 Guía Rápida

Safety Product Mechanical
Information Information Installation
The ground loop impedance must conform to the requirements of local safety regulations.
The drive must be grounded by a connection capable of carrying the prospective fault
current until the protective device (fuse, etc.) disconnects the AC supply.
WARNING
The ground connections must be inspected and tested at appropriate intervals.
Figure 4-1
1
4.3

Encoder connections

Refer to section 10.13 on page 268.
4.4

Serial communications connections

Refer to section 10.14 on page 269.
4.5

Screen 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
screens at the drive.
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 screening use cable with an overall shield and individual
shields on twisted pairs, connect the cable as illustrated in Figure 4-2. 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 4-2 Feedback cable screen connections
Shield
connection
to 0V
Connection
at drive
Unidrive SP Short Form Guide
Issue Number: 1
Electrical Getting
Installation Started
2
Twisted
pair
shield
Cable
Cable
Ground clamp
shield
on shield
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Running Advanced
Menu 0
the motor parameters
3
Twisted
pair
shield
Cable
shield
UL Listing
Diagnostics Appendix
Information
Plain washers
Spring washer
M6 bolt
Shield
connection
to 0V
Connection
at motor
13