Fanuc servo motor repair
Common failures, what the test checks, repair or replace.
FanucServo motor repair · India
Servo motor repair in India, tested under load before return
Star Automations repairs and refurbishes AC servo motors for plants and machine builders across India: Fanuc, Yaskawa, Siemens, Mitsubishi, Allen-Bradley, ABB, B&R and many other industrial makes. Your own motor is inspected, the failed parts are repaired or replaced, the encoder or resolver is tested and aligned, and the motor is run with no load and then under full load before it is returned with a printed test report. WhatsApp the nameplate and we confirm repairability before you courier.
00For your plant
What a tested repair gives your plant
Your own motor back
The same motor, serial and part number go back on the machine, so wiring, parameters and spares stay as they are.
No wait for a new unit
When the OEM quotes a long lead time or the motor is no longer made, a repair puts the axis back in service.
Proof before it ships
The motor is run and load-tested before dispatch, so your line is not where it gets tried out.
The cause, in writing
The test report records what failed and why, so your team can stop the same fault coming back.
01What is included
What a servo motor repair covers
The scope depends on what we find at inspection. You see the findings and the quote before work starts, so nothing is replaced without a reason.
- Inward inspection with photos and the serial number logged
- Bearings and oil seals replaced, shaft and keyway checked
- Brake checked for release voltage and holding; brake parts serviced
- Encoder or resolver repaired or replaced, then aligned to the rotor
- Winding insulation, hipot, resistance and balance tested; winding faults repaired
- Connectors and feedback cables cleaned, repaired or replaced
02Feedback
Feedback devices we test, align and program
Many servo motors that reach us have a feedback fault, not a winding fault. We test the feedback device on a universal servo motor feedback tester, repair or replace it, align it to the rotor, and on supported serial encoders read and program the encoder memory.
How it works: encoder alignment and programming.
- Incremental encoders with UVW or Hall commutation tracks
- Sin/cos encoders (1 Vpp)
- Resolvers
- Absolute encoders: EnDat, BiSS and BiSS-C, SSI, parallel absolute
- SICK Hiperface and Hiperface DSL
- Serial encoders: Fanuc, Mitsubishi, Yaskawa, Tamagawa and MFE types
- Hall effect sensors and tachogenerators
03Failure modes
How servo motors fail
Encoder faults
Serial communication errors, position loss and alarms at power-up. Often caused by coolant or oil reaching the encoder through a worn seal.
Bearing wear
Noise, vibration and heat at the drive end. Left too long, a bearing failure can damage the encoder and the shaft.
Brake problems
A brake that does not release overheats the motor; one that does not hold lets a vertical axis drop.
Winding and insulation
Overcurrent or ground-fault trips. Insulation tests show whether the winding can be saved.
04Verification
How the repair is proved
Every repaired motor goes through the same test sequence on our servo motor test system: electrical checks, feedback and commutation, brake, a no-load run, and then a full-load run on a custom-built load rig. Measured speed and current are compared with the nameplate, and vibration and noise are checked at rated speed.
The results go on a printed test report that travels with the motor. See the real tester screens and run test and a sample test report.
Repair is not always the right answer. If the frame is damaged, the magnets are weak or the encoder cannot be sourced, we tell you and suggest a stock motor or an upgrade instead.
05Where
Where each step takes place
Each motor follows the same route, at whichever of our three sites receives it.
| Step | Where it happens |
|---|---|
| Nameplate review and repairability check | WhatsApp or email, before anything is shipped |
| Receiving the motor | Chennai (Poonamallee), Puducherry (Thattanchavady) and Bengaluru (Mahadevapura), by hand-in, courier or pickup |
| Inspection, photos and quote | Chennai, Puducherry and Bengaluru |
| Repair: bearings, seals, brake, winding, connectors | Chennai, Puducherry and Bengaluru |
| Encoder or resolver test, alignment and programming | Chennai, Puducherry and Bengaluru |
| Final run test and full-load test | On the universal servo motor test system before dispatch |
| Printed test report and dispatch | From the site that repaired the motor |
06Brands
Repair by brand
We also repair Panasonic, Delta, Omron, Bosch Rexroth (Indramat), Kollmorgen, Parker, Schneider Electric (including Elau and Berger Lahr), SEW-Eurodrive, Sanyo Denki, Fagor, Kawasaki, Baumüller, Stöber and Moog servo motors. Send the nameplate to confirm a specific model.
Yaskawa servo motor repair
Common failures, what the test checks, repair or replace.
YaskawaSiemens servo motor repair
Common failures, what the test checks, repair or replace.
SiemensMitsubishi servo motor repair
Common failures, what the test checks, repair or replace.
MitsubishiAllen-Bradley servo motor repair
Common failures, what the test checks, repair or replace.
Allen-BradleyABB servo motor repair
Common failures, what the test checks, repair or replace.
ABBB&R servo motor repair
Common failures, what the test checks, repair or replace.
B&R07How to send
How to send the motor
You can send a servo motor from anywhere in India. Talk to us before you courier, so the unit is expected and logged on arrival.
Send the nameplate
WhatsApp a clear photo of the nameplate, the alarm code and what the machine was doing when it failed.
We confirm repairability
We tell you whether we can test and repair that model before anything is shipped.
Courier or pickup
Courier the motor to our Chennai, Puducherry or Bengaluru site, or ask us to arrange pickup where needed.
Inspection and quote
The motor is opened, inspected and photographed. You get the findings and a quote before work starts.
Repair, test, dispatch
Repaired, run-tested and load-tested, then dispatched with a printed test report.
Which servo motor brands do you repair?
Fanuc, Yaskawa, Siemens, Mitsubishi, Allen-Bradley, ABB, B&R, Panasonic, Delta, Omron, Bosch Rexroth, Kollmorgen, Parker, Schneider Electric, SEW-Eurodrive, Sanyo Denki and other industrial makes. Your own motor is repaired and returned, with its serial number traced from inward to dispatch.
Can you repair a motor that loses position after winding or encoder work elsewhere?
Usually, yes. Position loss after winding or encoder work is often a commutation offset problem. We realign the encoder or resolver and prove it on the test system.
What decides repair or replace?
Frame and shaft condition, magnet strength, whether the encoder can be sourced, and how the repair cost compares with a new or stock motor and its lead time.
Is there a warranty?
A written warranty is given after a successful repair. Warranty terms are stated on each quotation.
What do I need to send for a quote?
A photo of the nameplate, the alarm code, and a short note on the symptom: noise, heat, position loss or brake trouble.
Send the nameplate. We confirm repairability before you courier.
WhatsApp a nameplate photo and the alarm code to +91 97866 22233, or email info@starautomations.com.