Operating Instructions

Fault Codes
Digital Keypad
309 | 443
Action time
Immediately act when the DC bus voltage is higher than the level
Fault treatment parameter
N/A
Reset method
Manual reset
Reset condition
Reset only when the DC bus voltage is lower than 90% of the over-voltage level
Record
Yes
Cause
Corrective Actions
Impulsive change of the load
● Connect the brake resistor, braking unit or DC bus to the drive.
● Reduce the load.
● Replace the drive with a larger capacity model.
● 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.
Motor ground fault
● 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.
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
10
Over-voltage at stop (ovS)
Over-voltage at stop
Action and Reset
Action level
230V series: 410 Vdc
460V series: 820 Vdc
575V series: 1116 Vdc
Action time
Immediately act when the DC bus voltage is higher than the level
Fault treatment parameter
N/A
Reset method
Manual reset
Reset condition
Reset only when the DC bus voltage is lower than 90% of the over-voltage level
Record
Yes
Cause
Corrective Actions
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 activates in the same power system, the input
voltage may surge abnormally in a short time. In this case, install an AC reactor.