Siemens SINAMICS G120 fault F30005: Power unit: Overload I2t
Fault F30005 on a SINAMICS G120 means the Power Module was overloaded: its I2t value r0036 reached 100% because the permissible rated current was exceeded for too long or the load duty cycle was not maintained. Alarm A07805 warns before the trip.
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Try Free Drive Diagnostic Upload a keypad photo, the fault history or a parameter export from your Siemens SINAMICS G120. InduQT compares the evidence and suggests the next useful checks.
When it happens
- Constant speed under sustained overload
- Repeated heavy starts (duty cycle)
- Long periods at current limit
Likely causes and checks
1Continuous load above the Power Module rating
- Points to it
- Trips after running a while; A07805 appeared first; r0036 climbs steadily.
- Check
- Trend r0036 and output current; reduce the continuous load or fit a larger Power Module.
2Duty cycle not respected
- Points to it
- Trips after several starts in quick succession.
- Check
- Compare the actual start/stop cycle with the Power Module’s permissible load duty cycle.
3Motor and Power Module current ratings mismatched
- Points to it
- Motor rated current close to or above the Power Module rating.
- Check
- Check the rated currents of motor and Power Module.
4Current limit set high
- Points to it
- p0640 well above the motor rated current.
- Check
- Reduce p0640; in U/f operation reduce p1341 (current limiting controller integral time).
Telling it apart
- F30005 is the Power Module’s thermal (time-based) overload. F30001 is an instant hardware overcurrent. F07801 is the motor current limit.
- A07805 (power unit overload I2t) is the alarm stage of the same protection: act on it before the trip.
Relevant parameters
| Parameter | Name | Why it matters |
|---|---|---|
| r0036 | Power unit overload I2t | Trips at 100%. |
| p0640 | Current limit | Siemens’ remedy includes reducing it. |
| p1341 | I_max controller integral time (U/f) | Listed in the List Manual as the I_max frequency controller integral time; reduce in U/f operation per Siemens’ remedy. |
Evidence to collect
- r0949 for F30005 (I2t, 100% = 16384)
- Trend of r0036 and output current
- Load cycle and start frequency
- p0640 and motor/Power Module ratings
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