Prolonging Motor Life - Allen-Bradley MPL-A310 Installation Instructions Manual

Prolonging 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 within your environment:
•
Always provide a drip loop in each cable to carry liquids away from the connection to the
motor.
•
If 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. Refer to
•
Inspect the motor and seals for damage or wear on a regular basis. If damage or excessive
wear is observed, replace the item.
•
The brake option on this servo motor is a spring-set holding brake that releases when
voltage is applied to the brake coil. A separate power source is required to disengage the
brake. This power source can be applied by a servo motor controller or manual operator
control.
If system main power fails, holding brakes can withstand occasional use as stopping
brakes. However, this creates rotational mechanical backlash that can cause damage to
the system, increase brake wear, and reduce brake life.
Holding brakes are not designed to stop rotation of the motor shaft, and they are not intended to
IMPORTANT
be used as a safety device. They are designed to hold a motor shaft at 0 rpm for up to the rated
brake holding torque.
Follow these steps to prevent motor shaft rotation.
1. Command the servo drive to 0 rpm.
2. Verify the motor is at 0 rpm.
3. Engage the brake.
4. Disable the drive.
MP-Series Low-inertia Servo Motor with 100 mm to 165 mm Frame Size 5
The cable enters beneath the
motor and forms a drip loop.
Shaft Seal Kits on page 23
Disabling the drive removes the potential for brake wear caused by a badly-tuned servo
system oscillating the shaft.
for more information on shaft seals.
Rockwell Automation Publication MP-IN001I-EN-P - January 2015
The cable enters above the
motor and does not form a
drip loop.