Chapter 5 Fault Code Information
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VFD-L-I Series
5-2
Revision July 2009, SW V1.1
Fault
Name
Fault Descriptions
Corrective Actions
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 for abnormal load in motor.
3. Check for correct wiring of input power to R-S-T
(for 3-phase models) without phase loss.
Software protection failure
Return to the factory.
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.07-
02
3. Use 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.07-00.
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).
Over-current during
constant speed operation
1.
Short-circuit at motor output: Check for
possible poor insulation at the output line.
2.
Check if the motor is obstructed.
3.
AC motor drive output power is too small:
Replace the AC motor drive with the next
higher power model.
Abnormal communication
1.
Check if the connection between SG+ and SG-
2.
Check if the communication format is correct.
Over-current during
acceleration
1.
Check for the loose screws between the AC
motor drive and motor
2.
Short-circuit at motor output: Check for
possible poor insulation at the output lines.
3.
Acceleration Time too short: Increase the
Acceleration Time.
4.
Torque boost too high: Decrease the torque
compensation setting in Pr.07-02
5.
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.
Summary of Contents for VFD-L-I Series
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