Heidenhain · Encoders
ERN 1387 — rotary encoder (1 Vpp, 2048 lines): fault codes, repair & supply
The ERN 1387 is a Heidenhain incremental rotary encoder with sinusoidal 1 Vpp signals, used on servo and spindle motors. Confirm the exact ID and line count before ordering. Star Automations sources and supplies the ERN 1387 and repairs failed units at component level, so you can choose between a replacement and getting your existing unit restored. This is a current OEM line. Availability and price are confirmed per enquiry. Most quotes come back the same day — send the part number or the fault code on WhatsApp.
Common Heidenhain ERN 1387 fault codes and what we usually find
Fault code wording can differ by firmware and manual revision — always confirm against the manual for your exact unit. The causes below are typical findings, not a diagnosis of your specific unit.
| Code | Meaning | Typical cause |
|---|---|---|
| 25000 | Hardware fault, active encoder (Siemens NC) | Encoder cable, connector or encoder failure |
| 25020 | Zero mark monitoring (Siemens NC) | Dirty or damaged encoder, coupling slip, signal noise |
When a ERN 1387 needs attention
- Axis or spindle encoder alarm
- Jerky motion or poor speed regulation
- Missing or noisy encoder signals
- Alarm after motor or coupling work
- Damaged shaft, cable or connector
Replace or repair your ERN 1387
Source a replacement
Send the part number. We check sourcing from global surplus and the OEM channel and reply the same day with availability, condition and price. Advance or verified escrow applies.
Repair your existing unit
If sourcing takes longer or you want to keep your configuration, we repair at component level — power stage, gate-drive, control and supply sections — and test before dispatch.
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ERN 1387 — common questions
Can you supply the ERN 1387 in India?
Can a faulty ERN 1387 be repaired instead of replaced?
My ERN 1387 shows 25000 (hardware fault, active encoder (siemens nc)). What should I do?
Is the exact part number important?
Need the ERN 1387 now?
Send the part number or fault code — we reply the same day. Serving Chennai, Puducherry, Bengaluru, Hyderabad, Delhi and pan-India.