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In this case, first check whether the cooling fan operates normally by hand. When the fan operates normally, please check whether the ambient temperature is too high, whether the ventilation of the VFD is poor, or whether the temperature detection circuit is damaged.

SPI is an input phase loss detection fault.
1. When the input phase loss protection is enable, the input power supply is in phase loss
2. When the input phase loss protection is enable, the input phase loss detection circuit fails.
3. Check whether the power input is normal (phase loss or three-phase imbalance)

1. Check whether the input cable voltage is too low or the power supply voltage fluctuates too much. If so, adjust the grid voltage to the normal range.
2. Check whether the DC bus voltage displayed on the keypad is normal (1.35 times of the input voltage), and check whether the factory voltage level setting is correct. If it is not a standard voltage, adjust it to an appropriate voltage.
3. If the power is above 37kW, check whether the fan is normal. If the fan is stuck or burnt out, the contactor will not close and report UV.

1. Check whether the input voltage is high, adjust the voltage to the normal range (380V ± 15%), so that the DC bus voltage is not higher than 800V.
2. Check whether the deceleration time is too short, and appropriately extend the deceleration time if conditions permit.
3. Check whether the inertia of the load is too large, or there is an external force to drag the motor during the acceleration of the load. If so, cancel the external force or change to coast stop.
4. Or try to install braking devices.

1 check whether the input voltage is high, adjust the voltage to the normal range (380V ± 15%), so that the DC bus voltage is not higher than 800V.
2. Check whether the parameters of the VFD are set correctly or whether the auto-tuning parameters of the motor are correct. If not, please change the correct parameters according to the actual situation.
3. Check whether the acceleration time is too short, and appropriately extend the acceleration time if conditions permit.
4. Whether the VFD drives the motor with external force during acceleration. If there is external force driving, try to cancel the external force or install braking device.

1. Check whether the parameters of the VFD are set correctly or whether the auto-tuning parameters of the motor are correct.
2. Check whether there is leakage in the output circuit of the VFD. If there is leakage, please eliminate it. Make sure that the output cable of the VFD is less than 50m. If the output cable is too long, it is recommended that the customer install an output reactor or output filter.
3. Whether the load changes suddenly during constant speed operation, and adjust the parameters to make the current limiting protection effective

1. Check whether the motor no-load current in the motor auto-tuning parameters is below 60% of the motor rated current or not. If the deviation is large, please do auto-tuning again.
2. Check the deceleration time of the VFD, whether the inertia of the load is too large, and whether there is a sudden change load during deceleration.
3. If the adjustment parameters still cannot be solved, it can be determined that the selected power of the VFD is too small, and it is recommended to replace the one with higher power model.

1. Check whether the motor is connected before auto-tuning to ensure that the motor has been correctly connected with the VFD.
2. Check whether the motor capacity matches the VFD capacity. If the VFD capacity is too small, suggest to replace the VFD matching the motor capacity.
3. Check whether the motor rated parameters are set correctly to ensure that the motor rated parameters have been set correctly before auto-tuning.
4. Check whether the auto-tuning parameters of the VFD deviate too much from the actual values. Users can do auto-tuning for several times and take the closer parameters.

1. Determine whether to restart the rotating motor. If so, consider restarting the motor after it stops stably or setting the speed tracking to be effective.
2. Check whether the acceleration time of the VFD is too short, and extend the acceleration time with the permission of the user.
3. Check whether the output voltage is low when at 60 Hz, and adjust the motor no-load current to make the output voltage reach 460V.
4. Check whether the current displayed on the keypad is consistent with the actual current. If so, it is recommended that the customer replace the higher power VFD.
5. Check whether the VFD model is set correctly (whether it corresponds to the load type, if not, reset the model).