Applicable Systems
Hydraulic
Symptoms
The Hydraulic 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.
Source: Parker Hydraulic System Manual, Parker Hannifin Corporation
Category: Hydraulic & Pneumatic