Chapter 6 Fault Code Information
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VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00
6-3
Fault
Name
Fault Descriptions
Corrective Actions
Over-current during
acceleration
1.
Short-circuit at motor output: Check for
possible poor insulation at the output lines.
2.
Torque boost too high: Decrease the torque
compensation setting in Pr.7-02.
3.
Acceleration Time too short: Increase the
Acceleration Time.
4.
AC motor drive output power is too small:
Replace the AC motor drive with the next
higher power model.
Over-current during
deceleration
1.
Short-circuit at motor output: Check for
possible poor insulation at the output line.
2.
Deceleration Time too short: Increase the
Deceleration Time.
3.
AC motor drive output power is too small:
Replace the AC motor drive with the next
higher power model.
Over-current during
constant speed operation
1.
Short-circuit at motor output: Check for
possible poor insulation at the output line.
2.
Sudden increase in motor loading: Check for
possible motor stall.
3.
AC motor drive output power is too small:
Replace the AC motor drive with the next
higher power model.
External Fault
1.
Input EF (N.O.) on external terminal is closed
to GND. Output U, V, W will be turned off.
2.
Give RESET command after fault has been
cleared.
Emergency stop
1.
When the multi-function input terminals MI1 to
MI6 are set to emergency stop (setting 19 or
20), the AC motor drive stops output U, V, W
and the motor coasts to stop.
2. Press RESET after fault has been cleared.
Internal EEPROM can not be
programmed.
Return to the factory.
Internal EEPROM can not be
read.
Return to the factory.
U-phase error
V-phase error
W-phase error
OV or LV
Current sensor error
OH error
Return to the factory.
Software protection failure
Return to the factory.
Password is locked.
Keypad will be locked. Turn the power ON after
power OFF to re-enter the correct password. See
Pr.00-07 and 00-08.
Auto accel/decel failure
1. Check if the motor is suitable for operation by
AC motor drive.
2. Check
if
the
regenerative energy is too large.
3. Load may have changed suddenly.
