Siemens alarm F30035: Power unit: Air intake overtemperature
SINAMICS S120 drive fault · SINAMICS S120
What it means
The temperature of cooling air entering the power unit exceeded the permissible limit - 55 degC for air-cooled units. Unlike chip/heatsink faults this measures the environment around the unit, so cabinet cooling and room ventilation are the first suspects. The fault value carries the intake temperature in 0.01 degC resolution.
Likely causes
- cabinet fan failed or heat exchanger/air-conditioning fault
- ambient temperature outside specification
- intake path blocked by dirty filters
- hot exhaust air recirculating into the intake
Triage note: Check cabinet climate control and fan elements; acknowledge only after A05002 threshold is undershot.
Need the part urgently?
Send us alarm F30035 with your machine details — typical RFQ turnaround is 24–48h.