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.
Heidenhain · ERN 1381 / ERN 1387
Heidenhain ERN 1381 and ERN 1387 encoder repair, test and alignment
ERN 1381 / ERN 1387 is a Incremental, possibly with sine/cosine commutation lines encoder with 8,192 incremental counts per turn. We test it, repair or replace it and align it to the rotor. Found on: Siemens 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
ERN 1381 / ERN 1387 at a glance
| Device | ERN 1381 / ERN 1387 |
|---|---|
| Brand family | Heidenhain |
| Type and format | Incremental, possibly with sine/cosine commutation lines |
| Counts | 8,192 incremental counts per turn |
| Found on | Siemens servo motors |
| Connector | Per motor model |
| Pole setting for alignment | 2 to 16 selectable |
The ERN 1381 and ERN 1387 are not serial encoders. They are tested as incremental encoders and may carry sine and cosine commutation lines. The ERN 1387 is also available from stock; see the part page.
02Faults
How ERN 1381 / ERN 1387 encoders usually fail
- Missing or weak A, B or Z channel
- Signal level outside range, including HTL levels above what the tester input allows
- Dirty or damaged disc
- Commutation lines that no longer match the rotor
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.
05FAQ
Questions
Can you repair a ERN 1381 / ERN 1387 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 Heidenhain units; Star Automations is an independent multi-brand repair company and is not an OEM service centre.
Are ERN encoders serial?
No. They are incremental encoders and are tested as such.
Do you stock the ERN 1387?
See our part page for the ERN 1387.
What should I send for a ERN 1381 / ERN 1387 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.