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Micro Master 440 fault F0022 repair

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Revision as of 11:36, 18 July 2024 by ASRepairs (talk | contribs)
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Micro Master 440 fault F0022 repair
Device Micro Master 440 6SE6440-2UD31-1CA1
Affects part(s) Main power relay
Needs equipment multimeter, soldering iron, soldering station
Difficulty ◉◉◉◌ Hard
Type Soldering, Part replacement


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)

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