Delta VFD1A5MS43ANSAA User Manual

Chapter 14 Fault CodesMS300
554
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 Condition
230V models: 410 V
DC
460V models: 820 V
DC
575V models: 1116 V
DC
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.

Delta VFD1A5MS43ANSAA Specifications

General

Brand	Delta
Model	VFD1A5MS43ANSAA
Category	DC Drives
Language	English