10 Signs Your Servo Equipment Needs Repair

Fanuc Servo Motor needing repairIs your servo equipment noisier or less efficient than when you first purchased the equipment? Your servo equipment is probably ready for a thorough inspection, cleanse, repair, and simulated machine test.

The following list, discusses ten noticeable signs your servo equipment is ready for a repair, which can help save you from unexpected machinery downtime.

1. Noisy Servo Equipment

If your servo equipment is louder than usual, do not ignore the sound. When your servo components become noisier, the noise can mean the bearings have worn out, the keyway has worn out, the shaft is not fitting right, and/or the fans are not working correctly.

2. Drawing High Amps

When your servo equipment draws high amps, it can mean the equipment has an internal component issue, winding failure, or the overall servo equipment is close to failure. Don’t wait around for your servo equipment to fail.

3. Servo Equipment Faults

Servo equipment faults you should be aware of are alarms, thermal faults, and overcurrent’s. If you are experiencing faults, the next step is to find the reason for the fault.

4. Dirty Heatsinks

Heatsinks are meant to draw heat away from your servo equipment; when your heatsink becomes dirty, the heatsink cannot perform properly causing the servo equipment to overheat. Once the servo equipment overheats, the servo equipment will likely breakdown and the IGBTs will blow up.

Make sure your servo equipment does not overheat. Also, if the heatsink is dirty, chances are there is other contamination and damage in the equipment.

5. Physical Damage

Physical damage to servo equipment can be caused by an employee, fork lift, or other external factors. Accidental physical damage can cause issues with your servo equipment’s performance.

You do not want to keep running or place a damaged piece of servo equipment in your machinery; the best idea is to have your servo equipment inspected and tested before running the servo equipment with your machinery, or you may make a small problem bigger by running the damaged equipment.

6. Contamination

Oil mist, coolant, dust, and other environmental contaminants can negatively impact your servo equipment. Contamination can cause overheating, internal components failing, and severe damage to the servo equipment.

If your servo equipment looks dirty on the outside, the equipment is probably dirtier on the inside. Don’t wait for your servo equipment to fail because it is dirty.

7. Oil Saturated Cables

Coolant is a necessary tool to cool down machinery; however, coolant can easily run down onto your servo equipment cables and saturate them in the oil found in coolant. The oil gets absorbed into the insulation and causes deterioration in the insulation. If the insulation on the individual wires inside the cable deteriorates, the exposed wires will send electricity through each other and cause the servo equipment to short.

Try to keep coolant away from your cables, and check your cables frequently for deterioration signs.

8. Overusing Equipment

Running your servo equipment for a long period of time at a high current can cause your stator to short. Servo equipment is meant to run at a certain rated capacity. If you are running equipment over rated capacity for a long period of time, your servo equipment will have a shorter life.

9. Inoperable Cooling Fans

Cooling fans, even if they are properly maintained, will eventually wear out over time. The result of inoperable cooling fans is overheating in your servo equipment. Some servo equipment has sensors causing the servo system to stop when the cooling fan stops. For the equipment without sensors your servo equipment may overheat and the IGBTs will blow up if you do not catch the inoperable fan fast enough.

10. No Preventative Maintenance Schedule

If your servo components are not on a preventative maintenance schedule and it has been about a year since the components have been serviced, chances are your servo component is ready for a thorough inspection and preventative repair. Your servo component may not have broken down yet, but the preventative inspection and repair will save you from unexpected down time.

With a preventative inspection and repair, all of the contaminated and damaged components in your servo equipment will be replaced. Your servo equipment will also receive thorough cleaning and testing, so your servo equipment will come back to you like new.

If you are experiencing any of the ten issues discussed above, send your item in for repair, and get ahead of a future breakdown and unexpected machinery downtime.

Some of RepairZone’s common repairs:

  • Fanuc: AC servo motors, AC servo drives, servo power supplies, CRT/HMI monitors, and servo amplifiers
  • Allen Bradley: AC servo motors, AC servo drives, servo power supplies, servo amplifiers, CRT/HMI monitors, and servo controllers
  • Indramat: AC servo motors, AC servo drives, servo power supplies, CRT/HMI monitors, and servo amplifiers
  • ProFace: CRT/HMI monitors


For information on a specific piece of servo equipment that may require a repair, contact RepairZone, and the RepairZone Team members will troubleshoot your problem and let you know the next step to correct the issue.

The Repair Zone Team | Call: (989) 922-0043

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