Rockwell Automation Publication VPL-IN001E-EN-P - August 2016
3
Kinetix VP Low Inertia Servo Motors with 063…165 mm Frame Size
Prolong Motor Life
Proper design and maintenance can increase the life of a servo motor. Follow these guidelines to maximize the life of a servo motor operated within
the
Environmental Specifications
on
page 22
:
• Create a drip loop in the single motor cable to carry liquids away from the connection to the motor.
• Whenever possible, provide shields that protect the motor housing, shaft, seals, and their junctions from contamination by foreign matter
or fluids.
• Shaft seals are subject to wear and require periodic inspection and replacement. Replacement is recommended every 3 months, not to
exceed 12 months, depending on use. See
Shaft Seal Kits
on
page 22
for more information.
• Inspect the motor and seals for damage or wear on a regular basis. If you detect damage or excessive wear, replace the item.
Shaft Seals
An additional seal is required on the motor shaft near the motor front bearing if the shaft is exposed to significant amounts of fine dust or fluids,
such as lubricating oil from a gearbox. An IP66 rating for the motor requires a shaft seal and environmentally sealed connectors and cables.
The additional seal is not recommended in applications where the motor shaft area is free of liquids or fine dust, and a lower rating is sufficient:
• See
Environmental Specifications
on
page 22
for a brief description of the IP rating for these motors.
• See
Shaft Seal Kits
on
page 22
for seal kits compatible with your motor.
• See Kinetix Rotary Motion Specifications Technical Data, publication
KNX-TD001
, for Bulletin 2090 cables with environmentally sealed
connectors compatible with these motors.
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 causes system
instability and can 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, verify that the connections are properly aligned and that axial and radial loads are within
the specifications of the motor. See
Load Force Ratings
on
page 11
for guidelines to achieve 20,000 hours of motor bearing life.
Prevent Electrical Noise
Electromagnetic interference (EMI), commonly called electrical noise, can affect motor performance. Follow these guidelines to reduce the effects
of EMI:
• Isolate the power transformers or install line filters on all AC input power lines.
• Use shielded cables.
• Shield signal cables from power wiring.
• 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.
Install Cables
Knowledgeable cable routing and careful cable construction improves system electromagnetic compatibility (EMC).
ATTENTION:
Damage can occur to the motor bearings and the feedback device if sharp impact is applied to the shaft during installation of couplings and pulleys.
Damage to the feedback device can result from applying leverage to the motor mounting face when removing devices mounted on the motor shaft.
Do not strike the shaft, couplings, or pulleys with tools during installation or removal. Use a wheel puller, to apply pressure from the user end of the shaft, when
attempting to remove any device from the motor shaft.
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.