Chapter 6 Fault Code Information
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VFD-B-P Series
Revision April 2009, SW V1.00
6-3
Fault
Name
Fault Descriptions
Corrective Actions
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.
1.
Press RESET to reset all settings to the
factory setting
2.
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.
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.
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.
Communication Error
1.
Check the RS485 connection between the AC
motor drive and RS485 master for loose wires
and wiring to correct pins.
2.
Check if the communication protocol, address,
transmission speed, etc. are properly set.
3.
Use the correct checksum calculation.
4.
Please refer to group 9 in the chapter 5 for
detail information.
Software protection failure
Return to the factory.
