Applicable Systems
SK
Symptoms
The SK reports a DC bus undervoltage fault. The bus capacitor voltage dropped below the minimum operating level.
Possible Causes
- Input power supply voltage dip or momentary outage
- Power supply capacity insufficient for the drive load
- Rectifier bridge fault reducing DC bus charging
Troubleshooting Steps
- Step 1: Measure the input supply voltage during operation
Voltage remains stable within the rated range - Step 2: Check the rectifier bridge for diode failure
Rectifier bridge is healthy - Step 3: Install a voltage stabilizer if supply dips are frequent
Supply voltage is stable
How to Reset
To reset: Restore the DC bus voltage to the rated level, then reset.
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Source: NORD SK Drive System Manual, NORD Drives
Category: PLC & VFD
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