Rockwell Automation TL-Series Servo Motor - Manual (Page 6)

6 TL-Series Servo Motor Installation Instructions
Publication TL-IN001C-EN-P — March 2005
Prolonging Motor Life
Thoughtful design and proper maintenance can increase the life of a servo motor.
The following are guidelines to maximize the life of a servo motor.
• Always provide a drip loop in each cable to carry liquids away from connections.
• If design requirements permit, provide shields that protect the motor housing,
shaft seals, and their junctions from product contamination and fluids.
• Inspect the motor and seals for damage or wear at 6-month intervals. Replace
damaged items.
A dry and dusty environment will cause a seal to wear more rapidly than a wet or
oily environment. However, fluids can be forced around worn seals more easily
than dry particles. Replace a shaft seal at or before its expected lifetime, as
bearing contamination significantly shortens the life of a servo motor.
• Brakes on these servo motors are holding brakes. The brakes are spring-set, and
release when voltage is applied to the brake coil. A separate power source is
required to disengage the brake. This power source may be applied by a servo
motor controller, in addition to manual operator control.
The recommended method of preventing shaft rotation is:
1. Command the servo drive to 0 rpm.
2. Verify the motor is at 0 rpm.
3. Engage the brake.
4. Disable the drive.
Disabling the drive removes the potential for brake wear caused by a poorly
tuned servo system oscillating the shaft.
If system main power fails, holding brakes can withstand occasional use as
stopping brakes. This situation allows some shaft rotation as the braking occurs,
and also may create mechanical backlash within the system. Braking with power
applied to the motor is potentially damaging to the system, increases brake wear,
and reduces brake life.
IMPORTANT
Holding brakes are not designed to stop rotation of the
motor shaft, nor are they intended to be used as a safety
device. They will hold a motor shaft at 0 rpm for up to the
rated brake holding torque.