Siemens G120 F0006 Fault — What It Means
F0006 on a Siemens SINAMICS G120 means the drive has detected a critical chip-temperature rise in the power electronics and has tripped with an OFF2 shutdown. This is not a simple overtemp alarm you can reset and ignore. The drive is protecting itself from thermal damage. Siemens fault documentation points to both application-level causes (overload, incorrect motor sizing, excessive switching frequency) and hardware failure in the inverter power stage when the fault persists.
Common Causes
- Overload or excessive duty cycle The drive is being asked to deliver more torque or current than its thermal capacity allows, especially in applications with continuous high load.
- Motor power mismatch Motor power (p0307) does not align with inverter power (r0206), causing the drive to work harder than it was sized for.
- Excessive switching frequency High PWM switching frequency creates thermal stress in the power stage, and Siemens specifically mentions parameter P0290 = 0 or 2 as a preventive setting for F0006.
- Incorrect motor thermal parameters Motor nominal overtemperature values in p0626–p0628 are not set correctly, confusing the drive’s thermal model.
- Failed inverter power module When thermal conditions are correct but the fault persists, the internal power electronics have failed and require replacement.
Step-by-Step Fix
- Verify the load profile and duty cycle. Confirm the application is not demanding more continuous torque or current than the drive’s thermal rating allows.
- Check motor and drive sizing. Compare motor power in parameter p0307 against inverter power shown in r0206 to confirm they match.
- Inspect motor thermal data. Review parameters p0626 through p0628 to verify motor nominal overtemperature values are correctly entered for your motor.
- Review switching frequency setting. If your application has triggered this fault before, check parameter P0290 and try setting it to 0 or 2 as Siemens recommends to reduce thermal stress.
- Inspect cooling conditions. Check airflow around the drive, clean any blocked vents, and confirm cabinet ventilation is adequate for the installed load.
- Clear the fault and test. After correcting parameters or improving cooling, acknowledge the fault and run a controlled test cycle to see if F0006 returns.
- Replace the inverter power module if fault persists. When thermal settings and load conditions are correct but the drive still trips, contact Siemens service for power module replacement.
Parts Often Needed
| Part | Notes |
|---|---|
| Siemens G120 inverter power module | Amazon | Required when hardware failure is confirmed. Contact Siemens or an authorized distributor for the correct module for your frame size. |
When to Call a Pro
Call a qualified technician or Siemens service immediately if the fault returns after you have verified motor sizing, corrected thermal parameters, and confirmed adequate cooling. Persistent F0006 after parameter corrections indicates a hardware failure in the power stage that requires factory-authorized replacement of the inverter power module. Do not attempt repeated resets without addressing the root cause, because continued operation with a real thermal fault can damage the drive permanently.