Emergency: same day
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Yaskawa · Yaskawa ABC 12 bit absolute
Yaskawa 12 bit absolute encoder repair
Yaskawa ABC 12 bit absolute is a Absolute with A, B, C lines encoder with 4,096 counts per turn. We test it, repair or replace it and align it to the rotor. Found on: Yaskawa and Allen-Bradley servo motors. 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
01Facts
Yaskawa ABC 12 bit absolute at a glance
| Device | Yaskawa ABC 12 bit absolute |
|---|---|
| Brand family | Yaskawa |
| Type and format | Absolute with A, B, C lines |
| Counts | 4,096 counts per turn |
| Found on | Yaskawa and Allen-Bradley servo motors |
| Connector | Per motor model |
| Pole setting for alignment | Set at alignment |
The 12 bit absolute type gives 4,096 counts per turn.
02Faults
How Yaskawa ABC 12 bit absolute encoders usually fail
- Missing or weak A, B or Z channel
- Signal level outside range
- Dirty or damaged disc
- Commutation lines that no longer match the rotor
- Lost absolute position
02+Alarms
Yaskawa ABC 12 bit absolute alarms and error codes: what they mean and what to check
These are the alarms most often seen with the Yaskawa ABC 12 bit absolute feedback device, with what each usually means and what to check first. Many encoder alarms are caused by the cable, connector or battery, not the encoder, so the checks below can save a repair.
| Alarm | Usually means | Check first |
|---|---|---|
| A.81 or A.810 | Absolute encoder backup lost | Battery and battery cable; reset the encoder and set the reference again |
| A.82 or A.820 | Encoder memory checksum error | Reset once; if it returns, the encoder memory is at fault |
| A.83 or A.830 | Absolute encoder battery low | Replace the battery with control power on |
| A.84 or A.840 | Encoder data error | Noise and cable, then the encoder |
| A.85 or A.850 | Encoder overspeed at power-up | Check that the shaft was not turning at power-on; then the encoder |
| A.86 or A.860 | Encoder overheated | Motor temperature and cooling; then the encoder |
| A.C8 or A.C80 | Absolute encoder clear or multi-turn limit setting error | Repeat the clear with the correct procedure; the encoder if it fails again |
| A.C9 or A.C90 | Encoder communication error | Connector, cable, shield; then the encoder |
| A.C91 and A.C92 | Encoder position data or timer error on the serial line | Noise and cable first |
| A.CA or A.CA0 | Encoder parameter error | Encoder memory; programming or repair |
| A.Cb or A.Cb0 | Encoder echo-back error | Cable and noise |
| A.CC or A.CC0 | Multi-turn limit disagreement | Make the multi-turn limit setting in the drive match the encoder, especially after a drive swap |
The first number is the older Sigma wording and the second the newer Sigma wording. Alarm numbers and wording change with drive series and firmware, so check the manual for your drive. Drive brand names are used only to identify alarm lists. Star Automations is an independent multi-brand repair company and is not an OEM service centre.
Typical causes and checks
- Alarm at every power-up: reseat the connector at both ends, check the encoder supply at the motor end, and look for a broken wire.
- Alarm only when the axis moves or the cable flexes: suspect a break inside the cable chain, or a shield that has come loose.
- Alarm after coolant, washdown or rain: look for moisture or corrosion in the connector and behind the encoder cover.
- Alarm at random with other drives running: check earthing and shield clamps, and keep the feedback cable away from power cables.
- Position lost after a long stop or battery change: check battery voltage and the battery cable before suspecting the encoder.
- Alarm after a motor, encoder or drive change: check the type, the motor data in the drive, and the encoder alignment, then set the reference position again.
Encoder, cable or drive?
Swap in a known-good feedback cable first. If the alarm stays, move the motor to another axis if the drives are the same type. If the alarm follows the motor, the encoder or motor needs testing. If it stays on the axis with a good motor and cable, the drive needs testing. We test the encoder, the motor and the drive, so send the nameplate if you are not sure which it is.
Related guides: Yaskawa A.810 alarm, Yaskawa A.C90 alarm, Servo encoder alarms.
03Process
How the repair is done
Receive and identify
We read the nameplate and encoder label and confirm the exact type.
Test
Count per turn, data status, alarm flags and, where fitted, incremental lines are checked on the bench.
Repair or replace
Board, connector or sensor faults are repaired; a matched encoder is fitted where repair is not sensible.
Align
Commutation is set to the rotor and checked at every pole pair using the electrical angle.
Verify and report
The motor is run on the bench and the readings are recorded in the report.
See encoder alignment, memory programming and replacement.
04Related
Other Yaskawa encoders we repair
05FAQ
Questions
What do encoder alarms on a Yaskawa ABC 12 bit absolute usually mean?
Most fall into four groups: no communication, corrupted data, a fault reported by the encoder itself, and lost battery backup or position. The alarm table on this page lists the common codes and the first check for each.
How can I tell whether the Yaskawa ABC 12 bit absolute encoder, the cable or the drive is at fault?
Swap in a known-good feedback cable, then move the motor to another axis if possible. If the alarm follows the motor, the encoder needs testing; if it stays on the axis, the drive does. A cable or battery fault can be fixed without sending anything.
Can you repair a Yaskawa ABC 12 bit absolute encoder?
Yes. We test the position count and status, repair or replace the encoder, align it to the rotor and run the motor. We repair Yaskawa units; Star Automations is an independent multi-brand repair company and is not an OEM service centre.
How does it differ from the 15 bit type?
Resolution: 4,096 against 32,768 counts per turn.
Do you reset absolute position?
Yes, as part of repair and alignment.
What should I send for a Yaskawa ABC 12 bit absolute enquiry?
A clear photo of the motor nameplate and, if the cover is off, the encoder label. You can send the motor or only the encoder.
06Enquiry
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.
→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.