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info@servotechusa.com • 1-866-80SERVO

Servo Motor Resolver Overspeed

Your servo drive pops an error code. You write down the error code and look it up in the manual – it corresponds to a "resolver overspeed" alarm. Next to that is written "check the feedback cables" as a probable solution. You replace the cable and get the same alarm.

Troubleshoot a Servo Resolver Alarm

Check Cable Shielding

  1. Check grounding of cables.
  2. Shields may be grounded to inside of cabinet.

If Previously Disassembled...

  1. Check resolver position relative to servo motor.
  2. Check alignment of resolver.

Check Wiring for Changes

  1. Swapped resolver wires can:
    • Cause reversed resolver direction
    • Change zero position location
    • Cease functioning
  2. Check wiring connections.

My Servo Motor Needs Repair.

  1. Call 1-866-80SERVO.

How to Identify the Source of a Servo Motor Resolver

Overspeed Error

A servo motor resolver overspeed error is a very common alarm, and can have many causes. Many of these error or alarm causes are easy to fix. With a process of elimination you often can determine what part of your system needs repair.

Are Your Cables Properly Shielded?

Your cables should have an internal shield that is properly grounded. Shields are usually grounded directly to the inside of a cabinet. Resolver based systems are very sensitive to noise and can be prone to alarms if not properly shielded.

Has Your Servo Motor Been Disassembled?

Have you had your servo motor rebuilt, or tried to rebuilt it yourself? If so, was the resolver properly aligned to the motor? If for any reason your resolver has changed its position in relation to your servo motor your system will not run. A misaligned resolver can cause many alarms, including resolver overspeed.

Has Your Servo Resolver Wiring Been Changed?

If you have swapped drives or changed cables then your wires could have been connected incorrectly. Swapping resolver wires can cause the resolver to swap direction, change to location of the zero position, or not function at all. Miswired resolvers can cause overspeed alarms.

In Summary

These are some causes for servo motor resolver overspeed. In many cases resolver overspeed is caused by something other than a bad servo. If you are having trouble with this alarm we suggest you review these possible causes before you send anything out for repair.

If your servo motor resolver is still causing an alarm or error, contact Servotech USA. We are servo motor experts, and ready to assist in every possible servo motor repair solution.