Chapter 6 Fault Code Information_VFD-B Series
6-2
Revision 10/2005, BE13, SW V4.08
Fault Name Fault Descriptions Corrective Actions
Over voltage
The DC bus voltage has
exceeded its maximum
allowable value.
1. Check if the input voltage falls within the rated AC motor
drive input voltage range.
2. Check for possible voltage transients.
3. DC-bus over-voltage may also be caused by motor
regeneration. Either increase the Decel. Time or add an
optional brake resistor (and brake unit).
4. Check whether the required braking power is within the
specified limits.
Overheating
Heat sink temperature too high
1. Ensure that the ambient temperature falls within the
specified temperature range.
2. Make sure that the ventilation holes are not obstructed.
3. Remove any foreign objects from the heatsinks and
check for possible dirty heat sink fins.
4. Check the fan and clean it.
5. Provide enough spacing for adequate ventilation.
Low voltage
The AC motor drive detects that
the DC bus voltage has fallen
below its minimum value.
1. Check whether the input voltage falls within the AC
motor drive rated input voltage range.
2. Check whether the motor has sudden load.
3. Check for correct wiring of input power to R-S-T (for 3-
phase models) without phase loss.
Overload
The AC motor drive detects
excessive drive output current.
NOTE: The AC motor drive can
withstand up to 150% of the
rated current for a maximum
of 60 seconds.
1. Check whether the motor is overloaded.
2. Reduce torque compensation setting in Pr.7-02.
3. Take the next higher power AC motor drive model.
Overload 1
Internal electronic overload trip
1. Check for possible motor overload.
2. Check electronic thermal overload setting.
3. Use a higher power motor.
4. Reduce the current level so that the drive output current
does not exceed the value set by the Motor Rated
Current Pr.7-00.
Overload 2
Motor overload.
1. Reduce the motor load.
2. Adjust the over-torque detection setting to an
appropriate setting (Pr.06-03 to Pr.06-05).
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