Rockwell Automation MPL-xxxx Servo Motor - Manual (Page 6)

6 MP-Series Low-inertia Servo Motor with 100 mm to 165 mm Frame Size
Rockwell Automation Publication MP-IN001H-EN-P - January 2014
Using Couplings and Pulleys
Mechanical connections to the motor shaft, such as couplings and pulleys, require a torsionally
rigid coupling or a reinforced timing belt. The high dynamic performance of servo motors can
cause couplings, pulleys, or belts to loosen or slip over time. A loose or slipping connection can
cause system instability and damage the motor shaft. All connections between the system and the
servo motor shaft must be rigid to achieve acceptable response from the system. Periodically
inspect connections to verify their rigidity.
When mounting couplings or pulleys to the motor shaft, be sure that the connections are
properly aligned and that axial and radial loads are within the specifications of the motor. Refer
to
Motor Load Force Ratings on page 18 for guidelines to achieve 20,000 hours of motor
bearing life.
Preventing Electrical Noise
Electromagnetic interference (EMI), commonly called noise, can cause poor motor performance
by inducing stray signals.
Follow these guidelines to prevent the effects of EMI:
•
Isolate the power transformers, or install line filters on all AC input power lines.
•
Separate signal cables from motor cabling and power wiring. Do not route signal cables
with motor and power wires, or over the vent openings of 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.
Refer to System Design for Control of Electrical Noise Reference Manual, publication
GMC-RM001 , for additional information on reducing the effects of EMI by improving the
system level electromagnetic compatibility (EMC).
ATTENTION: Damage can occur to the motor bearings and the feedback device if sharp impact to the shaft is
applied during installation of couplings and pulleys. Damage to the feedback device can result by applying
leverage from the motor mounting face to remove devices mounted on the motor shaft.
Do not strike the shaft, couplings, or pulleys with tools during installation or removal. Use a wheel puller
applying pressure from the user end of the shaft to remove any friction-fit or stuck device from the motor shaft.