Siemens · Drives
6SE6440-2UD21-5AA1 — MICROMASTER 440 drive: fault codes, repair & supply
The 6SE6440-2UD21-5AA1 is a Siemens MICROMASTER 440 AC drive, widely installed on pumps, conveyors and machines and now a legacy product. Star Automations sources and supplies the 6SE6440-2UD21-5AA1 and repairs failed units at component level, so you can choose between a replacement and getting your existing unit restored. This is a discontinued OEM line. We source it from global surplus, and advance payment secures your delivery slot. Most quotes come back the same day — send the part number or the fault code on WhatsApp.
Common MICROMASTER 440 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 |
|---|---|---|
| F0001 | Overcurrent | Short circuit, motor or cable fault, too-short ramp |
| F0002 | Overvoltage | Fast deceleration, regenerative load |
| F0003 | Undervoltage | Low or dropped supply |
| F0004 | Inverter overtemperature | Blocked airflow, failed fan, high ambient |
| F0005 | Inverter I2t | Sustained overload |
| F0011 | Motor overtemperature I2t | Mechanical overload, wrong motor data |
| F0022 | Power stage fault | Failed IGBT or gate drive |
| F0041 | Motor data identification failure | Motor not connected or wrong parameters |
| F0051 | Parameter EEPROM fault | Failed control board memory |
| F0070 | Setpoint error from communication | Fieldbus or USS link lost |
When a 6SE6440-2UD21-5AA1 needs attention
- Trips on start or at speed change
- Display blank or drive restarts
- Fan noise or overheating
- Burnt smell or blown input fuse
- Fieldbus communication errors
Replace or repair your 6SE6440-2UD21-5AA1
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.
What people look up for the 6SE6440-2UD21-5AA1
- 6SE6440-2UD21-5AA1 repair
- MICROMASTER 440 repair
- MICROMASTER 440 F0001
- MICROMASTER 440 F0002
- MICROMASTER 440 F0022 power stage fault
- MICROMASTER 440 replacement
6SE6440-2UD21-5AA1 — common questions
Can you supply the 6SE6440-2UD21-5AA1 in India?
Can a faulty 6SE6440-2UD21-5AA1 be repaired instead of replaced?
My 6SE6440-2UD21-5AA1 shows F0001 (overcurrent). What should I do?
Is the exact part number important?
Need the 6SE6440-2UD21-5AA1 now?
Send the part number or fault code — we reply the same day. Serving Chennai, Puducherry, Bengaluru, Hyderabad, Delhi and pan-India.