Rockwell Automation W-Series Brushless Servo Motor - Manual (Page 4)

4 W-Series Motor Installation Instructions
Publication 1398-IN520A-EN-P — May 2001
Guidelines for Installation and Maintenance
The following sections provide general installation and maintenance
information. The information should assist you to correctly install and to
provide maintenance that will prolong the lifetime of your W-Series servo
motor.
Prolonging Washdown Motor Life
Thoughtful design and proper maintenance can increase the life of a
washdown motor. The following are guidelines to maximize the life of a
servo motor in a washdown environment:
• Avoid spraying liquids under high pressure directly on the junction of
the motor shaft and housing. Fluids under high pressure can be forced
around worn seals, and contaminate the motor bearings. Bearing
contamination will significantly shorten the life of a servo motor.
If design requirements permit, provide shields that protect the motor
housing, shaft, seals and their junctions from product contamination
and high pressure fluids.
• Always use watertight cord grips (cable glands) to seal the encoder and
power cable openings, and provide a drip loop in each cable.
• If conduit encloses the power or encoder cables:
– Ensure that conduit lines do not have a negative pressure (vacuum)
that may draw water into the conduit line or motor enclosure.
– Install a short section of flexible conduit between the motor and the
rigid conduit to prevent machine vibration or constant pressure from
causing cable abrasion or motor misalignment.
• Replace the shaft seal at or before its expected lifetime.
– Teflon seals have an expected lifetime of 3 to 6 months.
– Viton seals have an expected lifetime of 12 months or greater.
Refer to Shaft Seals on page 18 for more information on shaft seals.
• Inspect the motor and seals for damage or wear on a regular basis. If
damage or adverse wear is suspected, replace the item.