Allen Bradley Servo Motor Repair

We often see the 8500 and the MPL series of Allen Bradley servo motors in for repair. But, the more common are the 1326AB series:

like this 1326AB-B720E-21 motor that Scott is currently servicing. When we receive your motor, it is put through rigorous electrical and mechanical testing - procedures to ensure key individual components operate at high industry standards:

• Surge testing, which checks all 3 phases of the motor
• Megger, to check to see if motor is grounded
• Back EMF testing, to check the magnetic strength of the rotor
• Mechanical tolerance checks and
• Torque testing of any brake if present
• We also verify the feedback device, in this case it is a resolver, to make sure it counts correctly.

In addition, we only use OEM parts in our repairs, and every step of the process—from machining to winding—is completed in-house. Once we do all of the necessary testing, it will determine where we go during the repair:

• If the stator is shorted, it goes to our winding department for rewind, where we use high-voltage, Nano-shielded wire and special insulation for each individual slot. New leads are connected as well.
• If end bells or shaft need machining, they go to our machining center
• During a standard repair, we wash and bake the stator and rotor; during re-assembly we change bearings with high performance bearings, install new seals, replace any broken connectors, and recondition the fan assembly.

During the final run-test, it will be paired with the 1394 Allen Bradley drive test fixture to verify that it is set to the correct OEM specs. It will be tested running in both directions, starting and stopping multiple times, to match the manufacturer's torque/speed curve at a minimum of 3 different run speeds for up to 2 hours to complete the repair. Repair Zone also stocks over 100 different models of remanufactured Allen Bradley Servo Motors.

When you get an Allen Bradley motor back from Repair Zone, it looks and runs like new again, and with a 1 year warranty, we guarantee your motor will run for a very long time.

“Repair Zone, Your Allen Bradley servo motor repair experts.”