Emergency: same day
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Encoder and feedback repair · India
Servo motor encoder repair, alignment and programming
We repair, replace, align and reprogram servo motor feedback devices: incremental and serial absolute encoders, resolvers and Hall sensors, across more than 40 motor brands. Each device is tested on a universal multi-brand feedback platform, aligned to the rotor, proved in a run test, and returned with a printed report showing counts, angles and status bits.
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
01Services
What we do with encoders, resolvers and Hall sensors
Encoder testing and repair
Fault found before anything is opened. Cable, connector, LED, board, battery circuit and memory faults repaired.
Encoder alignment
Commutation set to the rotor and checked at every pole pair.
OpenMemory read and programming
Motor data read, backed up, and written to a new encoder.
OpenEncoder replacement
Matching new or refurbished encoder sourced, fitted, aligned and programmed.
OpenResolver repair
Winding and signal checks, alignment, memory boards on Bosch and Indramat motors.
OpenHall sensors for BLDC and EV motors
Hall board repair or replacement and 60° or 120° alignment.
Open02Proof
What we measure and set on every feedback device
These are the checks that appear on your test report. Values are typical; each device is set to its maker's specification.
| Check | What we look for | Typical result |
|---|---|---|
| Supply voltage | Encoder powered at its rated level, current draw normal | 5 V for most; about 7 to 8 V for Hiperface and Indramat digital; ±15 V for older Hall and tach boards |
| Serial data link | Position data received continuously, no communication errors while turning | Receiving, no dropouts |
| Counts per revolution | Count changes by the rated amount every turn, over four or more turns in each direction | For example 65,536 on a Fanuc αi A64, 131,072 on a Tamagawa TS5667, 262,144 on a Mitsubishi OBA18 |
| Stuck bits | Every position bit changes state within one revolution | None stuck |
| Quadrature (incremental) | B to A phase and A and B pulse symmetry | 90° and 180°, usually within ±22° |
| Index pulse (Z) | One clean pulse per turn at the same shaft position | 1 per revolution |
| Commutation tracks | U V W, C1 to C8 or C and D signals switch at the right electrical angles | Edges 60° or 120° apart as the motor requires |
| Electrical angle at rotor lock | Rotor locked with DC across the windings, angle read at every pole pair | Same reading at each lock position, matched to the motor maker's offset |
| Encoder memory | Motor data block present, checksum valid, data matches the nameplate | Checksums OK; reprogrammed when a new encoder is fitted |
| Status bits | Internal error, battery, overheat and multi-turn flags | All OK; battery flag tested by removing the battery |
| Resolver | Excitation, sine and cosine levels, vector level, angle without dead spots | Excitation set between 1 and 20 kHz, 2 to 3 V; clean waveforms |
| Run test | Motor run on a universal drive using the repaired feedback | Smooth in both directions, normal current |
03Coverage
Feedback types and encoders we handle
| Feedback type | Encoder examples | Motors it is found on |
|---|---|---|
| Incremental ABZ with UVW | Renco RHS21D, RCH20, N-2300 to 5600; BEI H25; Hengstler F14; Nemicon; Eltra EH, EF80; Baumer BHF; Tamagawa incremental | Allen-Bradley TL, Y and MPL-H, Kollmorgen AKM and Goldline, Parker MPP and MPJ, Baldor BSM and M4500, Lafert, Reliance |
| Incremental 1 Vpp with sine and cosine commutation | Heidenhain ERN1387, ERN1381, ERN1326, RON350, ROD320, ROD426, ROD1424 | Siemens 1FT6 and 1FT5, Lust and Stromag FIP/FHP, Fadal and Baldor |
| Yaskawa C-channel and 12 or 15-bit absolute | UTOPH-81AWF, UTOPH-81AUS, UTOPI, 8,192 to 32,768 counts | Yaskawa SGM, SGMG, SGMS and USAEE, Allen-Bradley 8500 |
| Fanuc serial Pulsecoder | A, B, B2, C, α I8/A8/I64/A64/1000A, αi I64i/A64i/1000iA, β I32B/A32B/I64B/A64B/A128i | Fanuc α, αi, β and βi servo motors, robot motors, spindle sensors |
| Mitsubishi serial | OBE12, OBA13, OSA14, OAH14B, OHE4096, OBA/OSA17, OBA/OSA18, OSA/OSE104, 105 and 253 | HC-MF, HC-PQ, HC-KFS, HC-SFS, HF series, HA series, robot motors |
| Tamagawa serial | TS5643, TS5645, TS5647, TS5648, TS5667, TS5668, TS5669, TS5778, TS5781, MFE0017, MFE2500 | Panasonic MSMA, MSMD and Minas A, Toshiba and Shibaura, Nachi, Shinko and Kobelco robots, Rexroth MSM |
| Sanyo Denki and Sumtak serial | E03007758, E07B111335, E07B151103, E10B171103, R11G4113A, R11ABS, AEC/AEM and REC/REM 2048 | Sanyo Denki P, Q and R series, Nachi, Meiden |
| Heidenhain EnDat | ECN1313, EQN1325, ECI1118, EQI1130, ECI1317, EQI1329, ECN125 | Siemens 1FK7 and 1FT7, B&R 8LS and 8MS, Rexroth MSK, Kollmorgen, Baldor, Stober, AMK, Control Techniques Unimotor |
| SICK Stegmann Hiperface | SKS36, SKM36, SRS50/60, SRM50/60, SCS/SCM60/70, SNS50/60, SEL/SEK37 and 52 | Allen-Bradley MPL, MPF, MPS, 1326AB and H series, Rexroth MSK, Elau, Fagor, Schneider BMH, Baumüller, SEW DFS and CFM, Lenze MDXK |
| SSI and BiSS | Stegmann AG100 and AG661, Hengstler/Unico 319-663, EQN1325 SSI, BiSS AD36 | Indramat MAC, Stromag, MTS, Ultract |
| Indramat digital | ECN212, EQN224, ECN413, EQN425, ECN1313, EQN1325 (DSF/HSF), SCS70 | Indramat MDD, MHD, MKD and MKE, 2AD spindle |
| Kawasaki serial | H20/M21, HE-02 | Kawasaki robots, Sanyo Denki BL Super |
| Resolver | Single and multi-speed resolvers, Tamagawa and Sonder SMR | Allen-Bradley MPL and 1326AB, Bosch SR, Indramat MKD/MKE/MDD, Kollmorgen Goldline and 6SM, Parker, Baldor BSM, SEW DFS, Lenze MDFK |
| Hall sensors with tachometer | Hall boards, DC tach | Siemens 1FT5, Indramat MAC, Baldor, ABB PH, SEM HD and HJ, Kollmorgen Seidel SM56, BLDC and EV motors |
04By encoder maker
Encoder families
Heidenhain encoders
EnDat ECN/EQN/ECI/EQI, ERN and ROD incremental, Indramat digital.
OpenSICK Stegmann encoders
Hiperface SKS, SKM, SRS, SRM, SCS, SNS, SEL, SEK; SSI AG100.
OpenTamagawa and Panasonic encoders
TS5643 to TS5781, MFE0017, MFE2500.
OpenFanuc Pulsecoders
α, αi, β and βi serial Pulsecoders, spindle sensors.
OpenMitsubishi encoders
OBA, OSA, OSE, OBE, OHE serial encoders.
OpenYaskawa encoders
C-channel, UTOPH, UTOPI, 12 and 15-bit absolute.
OpenSanyo Denki, Sumtak and Kawasaki
E07B, E10B, R11, AEC/AEM, H20/M21, HE-02.
OpenIncremental encoders
Renco, BEI, Hengstler, Nemicon, Eltra, Baumer.
Open05Process
How an encoder job runs
Photo
Send the nameplate and encoder label.
Inward test
Fault recorded before opening.
Repair or replace
Board, cable or encoder.
Align and program
Rotor offset and motor data.
Run and report
Run test, printed report.
06Repair or replace
When we repair and when we replace
We repair when the fault is in parts that can be changed without affecting the optical or magnetic measurement: connectors, cables, power supply components, line drivers, the battery circuit or corrupted memory.
We replace the encoder when the code disc is cracked or contaminated beyond cleaning, the sensor chip has failed, or the bearing has let the disc touch the read head. A replacement is always aligned and, where the motor stores data in the encoder, programmed with that motor's data before it leaves us.
07FAQ
Encoder repair questions
Can a servo motor encoder be repaired, or must it be replaced?
Many can be repaired. Faults in the cable, connector, LED, board components, battery circuit or memory are repairable. If the code disc or sensor is damaged, we fit a replacement encoder and then align and program it so the motor works on your existing drive.
Will the motor work on my drive after an encoder is changed?
Yes, if the encoder is aligned to the rotor and, on motors that store data in the encoder, the motor data block is written back. We do both and run the motor before dispatch.
What is encoder alignment?
Setting the encoder's commutation position to the rotor's magnetic poles so the drive switches current at the right moment. A misaligned encoder makes a motor run hot, rough or weak, or trip on overcurrent.
Do you need the drive to test the motor?
No. We test the encoder and run the motor on a universal test platform, so you do not have to send the drive. Send the drive too if you suspect it.
How long does encoder repair take?
Emergency jobs the same day where the fault and parts allow; urgent in 3 working days; standard in 7 working days. Imported encoders are quoted with their own timeline.
My absolute encoder lost position after a battery alarm. Is it faulty?
Not always. Many absolute encoders lose the multi-turn count when the backup battery runs down. Replacing the battery and homing the axis often fixes it. If the alarm returns, the encoder or its battery circuit needs checking.
Do you repair resolvers and Hall sensors?
Yes. We test resolvers for winding faults and signal quality and align them, and we repair and realign Hall sensor boards on BLDC and EV motors.
What do I get back with the motor?
A printed test report: counts per revolution, phase and commutation readings, electrical angle at lock, memory and status results, and the run test.
08Learn
Guides for maintenance engineers
How to check encoder alignment yourself
A step-by-step check with a DC supply and a meter.
OpenEncoder, resolver or Hall sensor?
How each works and how each fails.
OpenEncoder alarms on Fanuc, Yaskawa and Mitsubishi drives
What the common alarms usually point to.
OpenChoosing feedback for a new motor
For motor makers and machine builders.
OpenFree downloads for your maintenance file
Printable one-page sheets from our bench. More on the resources page.
Servo motor encoder quick reference
Encoder families, interfaces, counts per revolution and the motors they sit on: Fanuc pulsecoders (alpha A64, A1000), Mitsubishi OBA/OSA, Yaskawa UTOPH, Tamagawa, Heidenhain ECN/EQN/ERN and SICK SKS/SRS/SRM.
PDF · 2 pages · 8 KB · free, no sign-up
Download PDFServo encoder alarm quick sheet
Common encoder and feedback alarms on Fanuc, Yaskawa, Mitsubishi and Siemens drives, what each usually points to, and what to check on the cable and connector first.
PDF · 1 page · 4 KB · free, no sign-up
Download PDFEncoder alignment checklist
What to record before removing an encoder, the order of checks after refitting it, and the readings that tell you commutation is right before the motor goes back on the machine.
PDF · 1 page · 4 KB · free, no sign-up
Download PDF09Enquiry
Send the nameplate or encoder label
A clear photo of the motor nameplate and, if the cover is off, the encoder label is enough to start. We reply with whether it can be repaired and a quote.
Message received
Our team replies by email or WhatsApp, usually the same working day. For a line-down motor, WhatsApp +91 97866 22233.