Delta MH300 Series User Manual

Chapter 14 Fault CodesMH300
14-11
ID No. Display Fault Name Description
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 series: 410 V
DC
460V series: 820 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 the over-voltage
level.
Record Yes
Cause Corrective Actions
Acceleration is too slow (e.g.
when elevator is going down)
Decrease the acceleration time.
Use brake 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 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 brake 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 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.

Delta MH300 Series Specifications

General

Brand	Delta
Model	MH300 Series
Category	DC Drives
Language	English