Delta VP3000 Series - Page 509

Chapter 8 Troubleshooting｜VP3000
500
ID No.
Fault Name
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 Condition
460V models: 820 V
DC
Action Time
Immediately acts when DC bus voltage is higher than the condition
Fault Treatment Parameter
No
Reset Method
Manual reset
Reset Condition
Reset only when DC bus voltage is lower than 90% of the over-voltage condition
Record
Yes
Cause
Corrective Actions
Impulsive change of the load
1. Reduce the load.
2. Replace with a drive with larger capacity.
The setting for stall prevention
condition is smaller than no-load
current
The setting for stall prevention condition should be larger than no-load current
Regenerative voltage of motor
inertia
Use over-voltage stall prevention (Pr. H1-08).
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 brief 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.
Malfunction caused by
interference
Verify the wiring of the control circuit and wiring/grounding of the main circuit to
prevent interference.