WEG CFW500 trips F0022 on deceleration, what to check?
My WEG CFW500 inverter is tripping with an F0022 fault, DC Link Overvoltage, specifically when the motor decelerates. What should I investigate first to resolve this?
The F0022 fault on a WEG CFW500 inverter indicates that the DC link voltage has exceeded its maximum allowed level for the configured supply. This often happens during deceleration, especially with high-inertia loads, as the motor regenerates energy back into the drive. The inverter's internal protection functions, such as DC link voltage limitation, are designed to prevent this fault by adjusting the ramp control.
Likely causes and checks
1Load inertia too high or deceleration ramp too fast
- Points to it
- High-inertia loads or rapid deceleration can cause the motor to act as a generator, feeding excess energy back into the inverter's DC link, leading to an overvoltage trip.
- Check
- Check the deceleration time (P0101) and the load inertia. Verify that DC link regulation is enabled and correctly configured (P0150/P0151 for V/f and VVW control, or P0184/P0185 for vector control).
2DC link regulation or braking level parameters set too high
- Points to it
- If the DC link regulation level (P0151 or P0185) or the braking level (P0153) are set too high, the inverter may not effectively manage regenerated energy, even with a braking resistor, leading to an overvoltage trip.
- Check
- Compare the current settings of P0151 or P0185 (regulation level) and P0153 (braking level) against the factory default values for your specific supply voltage.
3Supply voltage too high
- Points to it
- An excessively high input supply voltage can cause the DC link voltage to rise above its maximum limit, triggering the F0022 fault.
- Check
- Measure the actual supply voltage at the inverter input and compare it with the voltage specified on the inverter's label.
4Wrong supply voltage or P0296 setting
- Points to it
- If the inverter's configured supply voltage (P0296) does not match the actual input supply, or if the inverter itself is rated for a different voltage than the supply, it can lead to incorrect DC link voltage supervision and overvoltage trips.
- Check
- Verify that the inverter's label and the P0296 parameter setting accurately reflect the actual supply voltage being provided to the unit.
Next check: Since the fault occurs during deceleration, first check the deceleration time (P0101) and the load inertia. Also, ensure that the DC link regulation functions (P0150/P0151 or P0184/P0185) are enabled and correctly configured. If a braking resistor is used, check P0153 and ensure the DC link regulation functions are disabled.
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