Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual, Page: 156 / 252

MAINTENANCE
Troubleshooting
156
ovA
(7)
ov at accel
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 level 230V models: 410 VDC
460V models: 820 VDC
575V models: 1116 VDC
690V models: 1318 VDC
Action time Immediately act when DC bus voltage is higher than the level
Reset method Manually
Reset condition Reset only when DC voltage is lower than 90% of the over-voltage level
Recorded Yes
Possible Causes Corrective Action
• Acceleration is too slow
• 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
• Decrease the acceleration time. Use brake unit or DC bus. Replace the drive with a larger capacity
model.
• The setting for 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 [PROT-04] . Use auto-acceleration and auto-deceleration
setting [ADV-06] . Use a brake unit or DC bus
• Check if the over-voltage warning occurs after acceleration stops. When the warning occurs, do the
following:
•
Increase the acceleration time
• Set
[PROT-04]
for over-voltage stall prevention
• Increase setting value for
[VFD-26]
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 brake resistor and brake unit.
• Verify the wiring of the control circuit and wiring/grounding of the main circuit to prevent interference.
Fault Display Description