6 Troubleshooting
- 50 -
3-phase power supply normal?
Control board normal?
Fix the wrong wirings
Replace power board
Replace control board
Input phase loss
No
No
No
Yes
Yes
Power board normal?
Seek for support
Drive to motor wirings well connected?
Use V/F control and disconnect motor, UVW
voltage are balanced?
Power board normal?
Fix the wrong wirings
Check if motor windings
are balanced
Replace power board
Output phase loss
No
Yes
No
IGBT normal?
Replace IGBT
No
Yes
No
Yes
Seek for support