PH — High-voltage protection active

What does PH mean?

The system has detected that the busbar voltage is too high and has shut down to protect itself. This is indicated by 'PH' on the ODU main board LED display.

• Abnormal grid voltage
• Damaged drive board voltage sampling circuit
• Abnormal drive board busbar voltage sampling AD terminal

Click steps to track your progress.

1. 1

   Check if the grid voltage is normal.

2. 2

   If grid voltage is abnormal, contact support.

3. 3

   If grid voltage is normal, suspect a drive board issue and contact support.