Delta Electronics Network Device VFD-S - Manual (Page 19)

English- 19
Fault
Name
Fault Descriptions Corrective Actions
Over current
Abnormal increase in current.
4. Check for loose contacts between AC motor
drive and motor.
5. Increase the Acceleration Time.
6. Check for possible excessive loading
conditions at the motor.
7. If there are still any abnormal conditions when
operating the AC motor drive after a short-
circuit is removed and the other points above
are checked, it should be sent back to
manufacturer.
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.
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.6-03 to Pr.6-05).
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