Chapter 5 Troubleshooting 
5.2 Ground Fault
GFF
Ground fault
5.3 Over Voltage (OV)
Is output circuit(cable or |
| No | ||
motor) of AC motor drive |
| |||
|
| |||
grounded? |
|
| ||
|
| Yes |
|
|
|
|
|
| |
|
|
|
| |
| Remove ground fault |
|
| |
|
|
|
|
|
Maybe AC motor drive has malfunction or misoperation due to noise. Please contact DELTA.
Over voltage
Reduce voltage to | No Is voltage within | ||
be within spec. |
| specification | |
|
|
| Yes |
|
|
| |
|
|
|
|
Maybe AC motor drive has malfunction or misoperation due to noise. Please contact 
DELTA.
Has
No When OV occurs, check if the voltage of DC BUS is greater than protection value
YesYes
No
Reduce moment of inertia
Does OV occur when | Increase | Yes | ||||||||
sudden acceleration | deceleration |
|
|
| ||||||
|
|
| ||||||||
stops |
|
| time |
|
|
| ||||
|
|
| Yes |
| No |
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
| Increase | Yes |
|
|
|
|
| ||
|
| acceleration |
|
|
| Increase setting time |
| |||
|
|
|
| |||||||
|
| time |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
| ||
|
|
| No |
|
|
|
| Need to consider using | ||
No |
|
|
|
|
|
| ||||
|
|
|
|
|
| |||||
Reduce moment of load inertia | brake unit or | |||||||||
|
| DC brake | ||||||||
| No |
| |
|
| No | |
Use brake unit or DC brake | |||
| |||
| Yes |
| |
|
|
| |
Need to check control method. Please contact DELTA.
Revision July 2008, EG03, SW V1.06 |
