Chapter 14 Fault CodesMS300
556
Over-voltage during
constant speed
(ovn)
DC bus over-voltage at constant speed.
When ovn occurs, the drive closes the gate of the
output immediately, the motor runs freely, and the
display shows an ovn error.
230V models: 410 V
DC
460V models: 820 V
DC
575V models: 1116 V
DC
Immediately act when the DC bus voltage is higher than the level
Fault Treatment Parameter
Reset only when the DC bus voltage is lower than 90% of the over-voltage level
Impulsive change of the load
1. Connect the brake resistor, braking unit or DC bus to the drive.
2. Reduce the load.
3. Replace the drive with a larger capacity model.
4. Adjust the braking level (Pr.07-01 or bolt position of the brake unit).
The setting for stall prevention
level is smaller than no-load
current
The setting of the stall prevention level should be larger than no-load current
Regenerative voltage of motor
inertia
Use over-voltage stall prevention function (Pr.06-01)
Use a braking unit or DC bus
Power voltage is too high
Check if the input voltage is within the rated AC motor drive input voltage range,
and check for possible voltage spikes.
ON/OFF switch action of phase-in
capacitor in the same power
system
If the phase-in capacitor or active power supply unit acts in the same power
system, the input voltage may surge abnormally in a short time. In this case,
install an AC reactor.
The ground short circuit current charges the capacitor in the main circuit
through the power. Check if there is ground fault on the motor cable, wiring box
and its internal terminals.
Troubleshoot the ground fault.
Incorrect wiring of brake resistor or
brake unit
Check the wiring of the brake resistor or braking unit.
Malfunction caused by
interference
Verify the wiring of the control circuit and the wiring/grounding of the main
circuit to prevent interference.
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