When an improper operating condition occurs in the VFD, the operation panel display changes to one of the status indications shown in Table 2. If the fault does not correspond to any of the faults in Table 2 (or if you have any other problem), refer to the VFD68 Variable Frequency Drive Technical Bulletin (Part No. 24-7664-3051).
Table 1 defines the indication categories. Table 2 provides descriptions of the individual indicator messages.
| Indication Category | Description |
|---|---|
| Error message | A message regarding operational or setting errors displays. The VFD continues operating. |
| Warning | The VFD continues operating. Failure to take appropriate measures will lead to a fault. |
| Alarm | The VFD continues operating. You can also output an alarm signal by adjusting a parameter setting. |
| Fault | When a fault occurs, the VFD output reduces to 0 Hz, the motor stops, and the VFD outputs a fault signal. |
When a fault occurs, take the appropriate corrective action, then reset the VFD and resume operation. See Resetting the VFD68 Drive. Failure to take corrective action and reset the VFD may lead to a repeat of the fault condition and damage the VFD. For further information on troubleshooting, refer to the VFD68 Variable Frequency Drive Technical Bulletin (Part No. 24-7664-3051).
| Operation Panel Indication | Name | |
|---|---|---|
| Error message | ||
|
E--- | Faults history |
|
HOLD | Operation panel lock |
|
Er1 to 4 | Parameter write error |
|
LOCD | Password locked |
|
Err. | VFD reset |
| Warning | ||
|
OL | Stall protection (over-current) |
|
oL | Stall protection (over-voltage) |
|
RB | Regenerative brake pre-alarm (not used) |
|
TH | Electronic thermal relay function pre-alarm |
|
PS | PU stop |
|
MT | Maintenance signal output (not used) |
|
UV | Under-voltage |
|
SA | Safety Stop |
| Alarm | ||
|
FN | Fan alarm |
| Fault | ||
|
E.OC1 | Over-current trip during acceleration |
|
E.OC2 | Over-current trip during constant speed |
|
E.OC3 | Over-current trip during deceleration or stop |
|
E.OV1 | Regenerative over-voltage during acceleration |
|
E.OV2 | Regenerative over-voltage trip during constant speed |
|
E.OV3 | Regenerative over-voltage trip during deceleration or stop |
|
E.THT | Inverter overload trip (electronic thermal O/L relay function) |
|
E.THM | Motor overload trip (electronic thermal O/L relay function) |
|
E.FIN | Heatsink overheat |
|
E.ILF | Input phase loss (not used) |
|
E.OLT | Stall prevention stop |
|
E. BE | Brake transistor alarm detection |
|
E.GF | Output side earth (ground) fault over-current at start (not used) |
|
E.LF | Output phase loss |
|
E.OHT | External thermal relay operation (not used) |
|
E.PTC | PTC thermistor operation (not used) |
|
E.PE | Parameter storage device fault (not used) |
|
E.PUE | PU disconnection (not used) |
|
E.RET | Retry count excess |
|
E.5 | CPU fault |
|
E.CPU | |
|
E.CDO | Output current detection value exceeded (not used) |
|
E.IOH | Inrush current limit circuit fault |
|
E.AIE | Analog input fault |
|
E.SAF | Safety circuit fault |