Chapter 14 Fault Codes and DescriptionsCP2000
14-8
ID* Display on LCD Keypad Fault Name Fault Descriptions
9
Over-voltage at
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.
Action and Reset
Action level
230V series: 410 V
DC
460V series: 820 V
DC
575V series: 1116 V
DC
690V series: 1318 V
DC
Action time Immediately act when DC bus voltage is higher than the level
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset only when DC bus voltage is lower than 90% of over-voltage level
Record Yes
Cause Corrective Actions
Impulsive change of the load
1. Connect brake resistor, brake unit or DC bus to the drive.
2. Reduce the load.
3. Replace to drive with a larger capacity model.
4. Adjust 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 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 brake 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 brake resistor or brake unit.
Malfunction caused by interference
Verify the wiring of the control circuit and wiring/grounding of the main circuit to
prevent interference.
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