F07402 DC Link Undervoltage fault in siemens drive
F07402 DC Link Undervoltage fault in siemens drive indicates that the DC link voltage has fallen below the minimum threshold required for operation.
Cause
1. Line supply failure (phase loss).
2. Line voltage dip/sag.
3. Fuse failure in the input section.
Remedy
- Check line supply voltage.
- Check input fuses and contactors.
- Check for loose connections on the line side.
Cause
1. Line supply failure (phase loss).
2. Line voltage dip/sag.
3. Fuse failure in the input section.
Remedy
- Check line supply voltage.
- Check input fuses and contactors.
- Check for loose connections on the line side.
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