Troubleshooting - PENN Controls - VFD68Bxx - VFD68Cxx - Three‐Phase Motor Speed Controller - VFD68 Three‐Phase Variable Frequency Drive

VFD68 Variable Frequency Drives (230 or 460 VAC) Installation Guide

PENN Controls
Product name
VFD68 Three‐Phase Variable Frequency Drive
Document type
Installation Guide
Part number
Document revision
Revision date

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.

Table 1. Indication Categories on the Operation Panel Display
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).

Table 2. Indicator Messages
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
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
FN Fan alarm
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.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