VLT 131B0052 turns on for split second and turns off repair

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Revision as of 11:17, 27 May 2024 by ASRepairs (talk | contribs) (Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==Problem description== Repairing a danfoss VLT 131B0052 VFD "inverter" that when supplied with 3 phase AC, turns on for a split second (led/operator panel) and turns off immediately after. thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it! ==Symptoms== *Turns on then off immediately. *No communication. *DC link i...")
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VLT 131B0052 turns on for split second and turns off repair
Device
Affects part(s)
Needs equipment
Difficulty
Type


Problem description

Repairing a danfoss VLT 131B0052 VFD "inverter" that when supplied with 3 phase AC, turns on for a split second (led/operator panel) and turns off immediately after.

Example image (Figure 1) -- No image yet. Help expand this page by uploading it!

Symptoms

  • Turns on then off immediately.
  • No communication.
  • DC link is at full voltage (550v)

Solution

After verifying that all the power rails are at proper voltage and no shorts on the board, it's safe to assume the microcontroller itself is damaged. The board must be replaced or the microcontroller if you have a donor. You can't buy the MC and replace it directly, they have custom firmware on them. Unless it's a donor working one, you must replace the entire board. The IO board and the operator panel are both working fine! No need to replace those.

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