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A servo press uses servo motors for precise force and position control during forming operations.

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Siemens F30015 Power Unit Overtemperature on Servo Press: Diagnosis

admin

**Question:** We have a 250-ton servo press with Siemens SINAMICS S120. It runs fine for 2-3 hours then trips F30015 (power unit overtemperature) randomly. Resetting works but it comes back. What should I check?

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**Answer:**

F30015 is a power unit (IGBT module) overtemperature fault. The drive is protecting itself from thermal damage.

## Check the Cooling System First

1. **Check fan operation**: With the drive running, listen for the cooling fans. If silent, the fan has failed. Replacement part: 6SL3162-2BM00-0AA0 (for PM340 modules).

2. **Check air filter**: S120 booksize modules have a filter mat at the bottom inlet. If clogged, airflow drops 50-80%. Clean or replace every 3-6 months.

3. **Check cabinet temperature**: Measure air temperature at the drive inlet. Should be below 40C. If above, cabinet ventilation is insufficient.

4. **Check r0037**: This shows actual heatsink temperature. If it reaches 80-85C before the fault, cooling is marginal. If it trips at 60C, the temperature sensor may be faulty.

## Check the Duty Cycle

F30015 appearing after 2-3 hours suggests thermal accumulation - the drive sustains the load short-term but not continuously.

1. Check r0034 (drive utilization %): if consistently above 90%, the drive is undersized
2. Check production SPM vs. the drive rated continuous current
3. Try reducing SPM by 10% - if the fault disappears, the drive is thermally marginal

## Check for Derating Conditions

The S120 derates continuous current above 40C ambient. At 50C ambient, a 100A module is only rated for ~80A continuous.

If the fault is seasonal (worse in summer), add air conditioning to the electrical cabinet or upgrade to the next size drive module.

anna_controls

F30015 is often not a real overtemperature —it's a sensor issue. Check the temperature sensor on the power module first. I've seen corroded sensor connections give false readings. Clean the connector and re-seat it. If the fault persists, measure the actual heatsink temperature with an IR thermometer to verify.

raj_maintenance

We had this fault appearing every summer when shop temperature exceeded 35?C. Solution was simple: added a dedicated AC unit for the drive cabinet. Kept cabinet temperature below 40?C year-round. The $3,000 AC unit eliminated $20,000/year in lost production from random thermal faults.