Rockwell Automation TLY-Series Servo Motor - Manual (Page 5)

TL-Series Servo Motors 5
Publication TL-IN003A-EN-P — June 2007
• If design requirements permit, provide shields that protect the motor housing, shaft, seals and
their junctions from product contamination, caustic agents, and high pressure fluids.
• Replace the optional shaft seal at or before its expected twelve-month lifetime elapses.
Refer to Remove and Install a Shaft Key on page 21 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.
• If desired, the motor front flange may be sealed to the driven equipment by a bead of RTV
around the periphery of the motor to equipment joint. Use of a gasket or RTV on the mating
surfaces may cause misalignment of the shaft and result in damage to the motor and driven
equipment.
• Brakes on these servo motors are holding brakes. The brakes are spring-set, and release when
voltage is applied to the brake coil. A power source, either external or internal to the servo
drive, is required to disengage the brake. The power source may be applied by the machine
controller.
If system main power fails, holding brakes can withstand occasional use as stopping brakes.
However, this 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 are designed to hold a motor
shaft at 0 rpm for up to the rated brake holding torque.
Follow these steps to prevent 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.