Operating Instructions

Fault Codes
Digital Keypad
307 | 443
Record
Yes
Cause
Corrective Actions
Malfunction caused by interference
Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent
interference.
Hardware failure
Check if other error codes such as cd1–cd3 occur after cycling the power. If yes, return to the
factory for repair.
ID*
Display on LCD Keypad
Fault Name
Fault Descriptions
7
Over-voltage during
acceleration (ovA)
DC bus over-voltage during acceleration.
When ovA occurs, the drive closes the gate of the output, the motor
runs freely, and the display shows an ovA error.
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
Acceleration is too slow (e.g. hen lifting
load decreases acceleration time)
● Decrease the acceleration time
● Use a braking unit or DC bus
● Replace the drive with a larger capacity model.
The setting for stall prevention level is
smaller than no-load current
The setting for the stall prevention level should be larger than no-load current
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.
Regenerative voltage of motor inertia
● Use over-voltage stall prevention function (Pr.06-01)
● Use auto-acceleration and auto-deceleration setting (Pr.01-44)
● Use a braking unit or DC bus
Acceleration time is too short
● Check if the over-voltage warning occurs after acceleration stops.
● When the warning occurs, do the following:
1. Increase the acceleration time
2. Set Pr.06-01 over-voltage stall prevention
3. Increase the setting value for Pr.01-25 S-curve acceleration arrival time 2
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 and braking unit.
Malfunction caused by interference
Verify the wiring of the control circuit and the wiring/grounding of the main circuit to prevent
interference.