Delta Electronics AC Drive VFD-F Series - Manual (Page 28)

English-28
Fault
Name
Fault Descriptions Corrective Actions
Over-current
during steady state
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.
Emergency stop
1. When the multi-function input terminals MI1 to MI6 are set to
emergency stop, 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.
1. Turn off the power.
2. Check whether the input voltage falls within the rated AC
drive input voltage.
3. Turn on the power.
Internal EEPROM
can not be read.
1. Check the connections between the main control board and
the power board
2. Reset the drive to the factory settings.
U-phase error Return to the factory.
V-phase error Return to the factory.
W-phase error Return to the factory.
OV or LV Return to the factory.
Isum error Return to the factory.
OH error Return to the factory.
External Base
Block.
1. When the external input terminal (B.B) is active, the AC
motor drive output will be turned off.
2. Deactivate the external input terminal (B.B) to operate the AC
motor drive again.
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.
Ground fault
When (one of) the output terminal(s) is grounded, short circuit
current is more than 50% of AC motor drive rated current, the AC
motor drive power module may be damaged.
NOTE: The short circuit protection is provided for AC motor
drive protection, not for protection of the user.
1. Check whether the IGBT power module is damaged.
2. Check for possible poor insulation at the output line.
Analog feedback
error or ACI open
circuit
1. Check parameter settings and wiring of Analog feedback
(Pr.10-00).
2. Check for possible fault between system response time and
the feedback signal detection time (Pr.10-08).
Fan Power Fault
(150~300HP)
Return to the factory.
Fan 1 fault
(150~300HP) Remove any foreign objects on the heatsinks and check for
possible dirty heat sink fins.