Emergency: same day
For a line-down motor, where the fault and parts allow. WhatsApp us before you send it so the bench is kept free.
Servo motor repair · Control Techniques
Control Techniques servo motor repair
Star Automations repairs Control Techniques servo motors. The motor is inspected, the failed parts are repaired or replaced, the encoder is aligned where needed, and the motor is proved on our servo motor test system with a no-load run and a load test before it leaves our bench. Send the nameplate and we confirm repairability first. Star Automations is an independent multi-brand repair company and is not an OEM service centre.
- 25+years of servo repair, since 2000
- 3,000+customers across India
- 100+servo brands covered by our universal servo motor test equipment
- 5sites: Puducherry, Chennai, Bengaluru, Hyderabad, Delhi
- Same dayemergency repair option*
*Where the fault and parts allow. Every repaired unit returns with a printed test report.
Repair turnaround you can plan around
Send a photo of the nameplate first. We confirm whether the motor is repairable, and the quote, the same working day.
Urgent: 3 working days
Repair, encoder alignment and test, counted from the day the motor reaches the bench and the quote is approved.
Standard: 7 working days
Full repair, encoder alignment, run test under load and a printed test report.
- Free repairability check from a nameplate photo
- Printed test report with every motor
- Written warranty, terms stated on every quotation
- Pickup can be arranged; parts that must be imported are quoted with their own timeline
01Series
Control Techniques servo motors we repair
Current and obsolete Control Techniques servo motors. Frame sizes, speeds and feedback codes below come from the published product data; older ranges are listed as they appear on nameplates.
| Series | Frame sizes | Rated speeds | Supply | Feedback options | Status |
|---|---|---|---|---|---|
| Unimotor fm | 075, 095, 115, 142, 190, 250 | 1,000 to 6,000 rpm | 220 V (E) and 400 V (U) versions | Resolver, incremental encoder, EnDat and Hiperface SinCos, EnDat functional safety | Sizes 075 to 142 end of life; 190 and 250 continue |
| Unimotor hd | 055, 067, 089, 115, 142, 190 | 1,000 to 6,000 rpm, by frame | 220 V (ED) and 400 V (UD) versions | Resolver, incremental encoder, EnDat (including EnDat 2.2), Hiperface | Current; successor to the fm sizes now ended |
| Unimotor UM | 75, 95, 115, 142, 190 (as marked on nameplates) | 2,000, 3,000 and 4,000 rpm (speed digits in the model number) | Per nameplate | Resolver or incremental encoder; for example 4,096 lines per turn incremental | Older range, found with Unidrive SP drives |
Not in the table? Send the nameplate. We repair motors outside these series too.
02Model number
How to read a Control Techniques Unimotor model number
Unimotor fm and hd part numbers follow a fixed pattern. A nameplate such as 095U3B300BAFCA100190 reads as follows.
| Position | Meaning | Example (095U3B300BAFCA100190) |
|---|---|---|
| Frame size | Three digits, 075 to 250 | 095 |
| Supply code | E for 220 V class, U for 400 V class (hd uses ED and UD) | U |
| Magnet type (fm) | 3 standard, 6 high peak torque | 3 |
| Stator length | Letter A to H, by frame | B |
| Rated speed and brake | Two digits give the speed in hundreds of rpm; the next digit is 0 no brake, 5 fibre parking brake, 6 resin parking brake | 30 and 0: 3,000 rpm, no brake |
| Connection | Letter for the power and signal connector type | B |
| Shaft, feedback, inertia | Shaft code, two-letter feedback code, inertia code | A, FC, A: single-turn inductive EnDat |
| Mounting and shaft size | PCD and shaft diameter digits | 100190 |
Older Unimotor UM nameplates read differently, for example 115UMD300: frame 115, stator length D, 3,000 rpm.
03Feedback
Feedback codes and the encoder repair pages
| Code | Feedback | Notes |
|---|---|---|
| AE (AR on small hd frames) | Resolver | Robust, medium resolution. See resolver repair. |
| CA (CR on small hd frames) | Incremental encoder | High accuracy. See incremental encoder repair. |
| EC, FC and EB, FB | Inductive or optical EnDat SinCos, multi-turn (E) and single-turn (F) | See EnDat encoder repair. |
| RA, SA (TL, UL on small hd frames) | Optical Hiperface SinCos, multi-turn and single-turn | See Hiperface encoder repair. |
| EF, FF and EG, FG | EnDat functional safety and EnDat 2.2 | Safety-rated variants; send the nameplate. |
| NA | Sensorless (fm only) | No feedback device fitted. |
Encoder faults show on the drive as a feedback or encoder trip. See servo encoder alarms, and check the trip list in your drive manual.
04Obsolete
Obsolete and end-of-life Control Techniques motors
The manufacturer has published an end-of-life notice for the Unimotor fm sizes 075, 095, 115 and 142: notification November 2022, last time buy January 2024 and last ship November 2024. Sizes 190 and 250 are not affected, and Unimotor hd is named as the replacement range. Older Unimotor UM motors are also out of production.
If your motor is on the obsolete list, repair is often the quickest way to keep the machine running, because a replacement can have different dimensions or connectors. Send the nameplate and we confirm repairability first.
- fm: 075E3, 095E3, 115E3, 142E3
- fm: 075U3, 095U3, 115U3, 142U3
- fm: 075U6, 095U6, 115U6, 142U6
- fm: 095U5, 115U5, 142U5
- UM: 75UM, 95UM, 115UM, 142UM and 190UM series
05Failures
Common Control Techniques servo motor failures
Encoder and feedback faults
Communication alarms, lost position and signal errors. See servo encoder alarms.
Bearing noise
High-cycle axes wear bearings early; noise and heat show first.
Brake faults
Brakes that drag on release or slip when holding a load.
Cable and connector damage
Flexing in cable chains breaks feedback and power leads at the motor connector.
06Test bench
What the test bench checks
- Insulation resistance and hi-pot
- Winding resistance and balance
- Encoder or resolver feedback and commutation offset
- Brake release and holding, where fitted
- No-load run, then load run; speed and current against the nameplate
- Vibration and noise at rated speed
07How 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 bench, 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.
→How it works
From nameplate photo to a tested motor in 7 steps
One route for servo motors, encoders and drives. You see the price before any work starts, and the report before the unit leaves our bench.
- 1 · Nameplate photoSend it on WhatsApp or the form
- 2 · Repairable? QuoteUsually the same working day
- 3 · Courier or pickupThe unit reaches our bench
- 4 · Bench diagnosisInsulation, windings, brake, encoder
- 5 · RepairFailed parts, bearings, seals, brake
- 6 · Align and run-testEncoder aligned; no-load and load run
- 7 · Report and dispatchPrinted test report with the unit
- Line down?Servo Swap ships a tested unit first. How Servo Swap works
EmergencySame day*
Urgent3 working days
Standard7 working days
*Where the fault and parts allow. Turnaround counts from when the unit reaches our bench and the quote is approved.
08Questions
Control Techniques servo motor questions
Is the Unimotor fm discontinued?
Sizes 075, 095, 115 and 142 are end of life, per the manufacturer notice: last time buy January 2024 and last ship November 2024. Sizes 190 and 250 are not affected. We repair both ended and current Unimotor motors.
How do I read a Unimotor model number such as 095U3B300BAFCA100190?
095 is the frame size, U the 400 V class, 3 standard magnets, B the stator length, 30 and 0 mean 3,000 rpm with no brake, B the connector, and A, FC, A give the shaft, single-turn EnDat feedback and inertia. The last digits are the mounting and shaft size. The table on this page shows each position.
Do you repair the feedback device on a Unimotor?
Yes, whether it is a resolver, an incremental encoder or an EnDat or Hiperface encoder. The encoder is tested, repaired or replaced and aligned to the rotor.
Do you repair Control Techniques servo motors?
Yes. Send the nameplate and we confirm repairability before you courier.
Do you repair Unimotor servo motors?
Yes. Send the nameplate and we confirm repairability before you courier.
Do you need a Control Techniques drive to test the motor?
No. Our servo motor test system runs the motor without the original drive, then a load rig applies load.
What should I send for a quote on a Control Techniques motor?
A photo of the nameplate, the alarm code and a note on the symptom.
Send the nameplate. We confirm repairability before you courier.
WhatsApp a nameplate photo and the alarm code to +91 97866 22233.