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.
Indramat · DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325)
Indramat DSF and HSF multi-turn Heidenhain encoder repair
DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) is a Heidenhain multi-turn serial encoder with 1,024 counts per turn (E/RQN 224) or 2,048 (E/RQN 425 and EQN 1325). We test it, repair or replace it and align it to the rotor. Found on: Indramat MDD and MHD 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
DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) at a glance
| Device | DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) |
|---|---|
| Brand family | Indramat |
| Type and format | Heidenhain multi-turn serial |
| Counts | 1,024 counts per turn (E/RQN 224) or 2,048 (E/RQN 425 and EQN 1325) |
| Found on | Indramat MDD and MHD motors |
| Connector | Per motor model |
| Pole setting for alignment | 2 to 8 selectable |
These are the multi-turn partners of the single-turn units: the E/RQN 224 on MDD motors, the E/RQN 425 on MDD and MHD motors and the EQN 1325 on MHD motors.
02Faults
How DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) encoders usually fail
- No serial data from a board or cable fault
- Memory data unreadable, so the drive cannot identify the motor
- Wrong or lost position count
- Alignment that no longer matches the rotor
- Multi-turn count lost
02+Alarms
DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) alarms and error codes: what they mean and what to check
These are the alarms most often seen with the DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) 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 |
|---|---|---|
| Light source failure (encoder alarm bit) | The scanning light inside the encoder has weakened or failed | Encoder repair; check the supply first |
| Signal amplitude too low (alarm bit) | The scanning signals are weak: contamination, a damaged scale or failing electronics | Check cable and supply, then look for contamination inside the encoder |
| Position value error (alarm bit) | The encoder cannot compute a reliable position | Encoder test |
| Overvoltage or undervoltage (alarm bit) | Supply at the encoder is outside its range | Measure the supply at the encoder end; a long cable can drop it |
| Overcurrent (alarm bit) | The encoder draws too much current | Unplug the cable and compare; a short in the cable or encoder is likely |
| F31110 (SINAMICS) | Serial communication error with the encoder | Cable, connector and shield, then the encoder |
| F31112 (SINAMICS) | Error bit set in the serial protocol; the encoder reports its own alarm | Read the encoder alarm word, then follow the matching row above |
| Following error or rough running after replacement | Commutation or pole setting does not match the motor | The encoder must be aligned to the rotor with the right pole setting |
How a drive shows an EnDat alarm depends on the drive brand. Siemens SINAMICS wording is shown as an example. 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.
- Alarm after a motor, encoder or drive change: check the type, the motor data in the drive, and the encoder alignment.
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: Servo encoder alarms, Test a servo motor without the drive.
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 Indramat encoders we repair
05FAQ
Questions
What do encoder alarms on a DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) usually mean?
Most fall into four groups: no communication, corrupted data, a fault reported by the encoder itself, and a position or commutation mismatch. The alarm table on this page lists the common codes and the first check for each.
How can I tell whether the DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) 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 DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) 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 Indramat units; Star Automations is an independent multi-brand repair company and is not an OEM service centre.
What is the difference from the single-turn types?
They also count revolutions.
Do you repair the memory data?
We read and restore motor data where it is damaged.
What should I send for a DSF/HSF multi-turn (E/RQN 224, 425, EQN 1325) 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.