Using shaft seals – Rockwell Automation MPM-Bxxx Medium Inertia Servo Motor User Manual
Page 5
MP-Series Medium-inertia Servo Motor with 115 mm to 215 mm Frame Size 5
Rockwell Automation Publication MPM-IN001D-EN-P - January 2014
•
If possible, provide shields that protect the motor housing, shaft seals, and their
junctions from contamination by foreign matter or fluids.
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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
for more information.
•
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.
Using Shaft Seals
An additional seal is required on the motor shaft near the motor front bearing, if the shaft is
exposed to fluids or significant amounts of fine dust. This includes lubricating oil from a
gearbox. An IP65 or IP67 rating for the motor requires the use of a shaft seal and
environmentally sealed connectors/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:
•
Refer to
for a brief description of the IP rating for these
MP-Series motors.
•
Refer to
to find the catalog numbers of seal kits available for
your motor.
•
Refer to Kinetix® Motion Accessories Specifications, publicat
, to find
environmentally sealed connectors and cables compatible with the MP-Series motors.
IMPORTANT
Holding brakes are not designed to stop rotation of the motor shaft, and they are not intended to 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.
Disabling the drive removes the potential for brake wear caused by a badly-tuned servo system oscillating
the shaft.