Delta MS300 Series User Manual page 563

Chapter 14 Fault CodesMS300
ID Display on LCD Keypad
7
Action Condition
Action Time
Fault Treatment Parameter
Reset Method
Reset Condition
Record
Cause
Acceleration is too slow (e.g. hen
lifting load decreases acceleration
time)
The setting for stall prevention
level is smaller than no-load
current
Power voltage is too high
ON/OFF switch action of phase-in
capacitor in the same power
system
Regenerative voltage of motor
inertia
Acceleration time is too short
Motor ground fault
Incorrect wiring of brake resistor or
brake unit
Malfunction caused by interference
Fault Name
Over-voltage during
acceleration
(ovA)
Action and Reset
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
N/A
Manual reset
Reset only when the DC bus voltage is lower than 90% of the over-voltage level
Yes
Decrease the acceleration time
Use a braking unit or DC bus
Replace the drive with a larger capacity model.
The setting for the stall prevention level should be larger than no-load current
Check if the input voltage is within the rated AC motor drive input voltage range,
and check for possible voltage spikes.
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.
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
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
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.
Check the wiring of the brake resistor and braking unit.
Verify the wiring of the control circuit and the wiring/grounding of the main
circuit to prevent interference.
554
Fault Descriptions
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.
Corrective Actions