Inovance MD500

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79
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6
6 Troubleshooting and Solutions
Fault Name
Operating
Panel
Display
Cause Possible Solution
Pre-charge
resistor fault
● Bus voltage uctuates around
undervoltage threshold
continuously.
● Contact the agent or Inovance.
Undervoltage
● Instantaneous power failure
occurs
● Enable the power dip ride through function (F9-
59 ≠ 0).
● The AC drive's input voltage
is not within the permissible
range.
● Adjust the voltage to normal range.
● The bus voltage is abnormal. ● Contact the agent or Inovance.
● The rectier bridge, the buffer
resistor, the drive board or the
control board are abnormal.
● Contact the agent or Inovance.
AC drive overload
● Load is too heavy or locked-
rotor occurs on motor.
● Reduce load or check motor and mechanical
conditions.
● The AC drive power class is
small.
● Replace a drive of larger power class.
Motor overload
● F9-01 (Motor overload
protection gain) is set
improperly.
● Set F9-01 correctly.
● Load is too heavy or locked-
rotor occurs on motor.
● Reduce load or check motor and mechanical
conditions.
Input phase loss
● Input phase loss occurs. ● Eliminate faults in external circuitry.
● Drive board, lightning
protection board, control
board, or rectier bridge is
abnormal.
● Contact the agent or Inovance.
Output phase loss
● Motor winding is damaged. ● Check resistance between motor wires.
● The cable connecting the
AC drive and the motor is
abnormal.
● Check for wiring errors and ensure the output
cable is connected properly.
● The AC drive's three-phase
outputs are unbalanced when
the motor is running.
● Check whether the motor three-phase winding is
normal.
● The drive board or the IGBT
is abnormal.
● Contact the agent or Inovance.
IGBT overheat
● The ambient temperature is
too high.
● Lower the ambient temperature.
● The ventilation is clogged. ● Clean the ventilation.
● The fan is damaged. ● Replace the cooling fan.
● Thermally sensitive resistor of
IGBT is damaged.
● Replace the damaged thermally sensitive
resistor.
● The AC Drive IGBT is
damaged.
● Replace the AC Drive IGBT.
External fault
● External fault signal is input
via DI.
● Conrm that the mechanical condition allows
restart (F8-18) and reset the operation.
● External fault signal is input
via virtual I/O.
● Conrm that the virtual I/O parameters in group
A1 are set correctly and reset the operation.