Rockwell Automation VPL-xxxx Kinetix VP Low-inertia Servo Motor 063…165 mm Frame - Manual (Page 6)

6 Kinetix VP Low-inertia Servo Motor with 063…165 mm Frame Size
Rockwell Automation Publication VPL-IN001C-EN-P - November 2013
Preventing Electrical Noise
Electromagnetic interference (EMI), commonly called electrical noise, can reduce motor
performance. Effective techniques to counter EMI include filtering the AC power, using
shielded cables, shielding signal cables from power wiring, and practicing good grounding
techniques.
Follow these guidelines to avoid the effects of EMI:
•
Isolate the power transformers or install line filters on all AC input power lines.
•
Do not route motor cables over the vent openings on servo drives.
•
Ground all equipment by using a single-point parallel ground system that employs
ground bus bars or large straps. If necessary, use additional electrical noise reduction
techniques to reduce EMI in noisy environments.
See System Design for Control of Electrical Noise Reference Manual, publication
GMC-RM001 , for additional information on reducing EMI.
Installing Cables
Knowledgeable cable routing and careful cable construction improves system electromagnetic
compatibility (EMC).
To install the single motor cable, observe these guidelines:
•
Keep the cable length as short as possible.
•
Ground the cable shield to prevent EMI from affecting other equipment.
ATTENTION: The overall shield on the single motor cable must be grounded to obtain an effective encoder signal.
The encoder data signal is transmitted through an impedance-matched twisted-wire pair that requires effective
shielding for optimum performance.
Be sure there is an effective connection between the cable shield and the drive system ground.
ATTENTION: High voltage can be present on the shields of the single motor cable if the shields are not grounded.
Verify there is a connection to ground for all shields in the single motor cable.