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| Micro Master 440 fault F0022 repair | |
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Problem description
Repairing one of the causes for fault code F0022 "Power stack fault" on Siemens micromaster 440 inverter. This solution concerns the main power relay (figure 1)
Symptoms
- Works until a certain frequency/power then shows error F0022
- General fault F0022 even before starting the motor
- Shows fault F0022 as soon as starting the motor
Solution
- First confirm that the main IGBT module is not damaged in any way.
- Measure each individual IGBT as described here.
- If the IGBT module is okay, look under the main power relay.
- In my case, one of the legs was not soldered properly and it was black from overheating.
- Take out the relay and confirm that it's working by injecting voltage on it's coil and measuring the contacts.
- If the relay is working properly, repair the hole for the leg or run a thick wire jumper to where it's supposed to go (the wire on the side going to the adjacent PCB, measure with continuity to confirm which exact one).
- After this the inverter should work properly