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FAQs Library
Q
How does the torque of the motor change when changing V and f proportionally?
2022-08-15
A

If the voltage is reduced completely in proportion when the frequency decreases, the ground torque at low speed tends to decrease because the AC impedance becomes smaller and the DC resistance remains unchanged. Therefore, given V / F at low frequency, the output voltage should be increased to obtain a certain starting torque. This compensation is called enhanced starting.

Q
How much is the loss of the VFD itself?
2022-08-15
A

3% to 4%

Q
What is the service life of electrolytic capacitor?
2022-08-15
A

The electrolytic capacitor needs to be replaced after 30,000-40,000 hours of use.

Q
How to deal with OH1/OH2 fault?
2022-08-15
A

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.

Q
How to deal with UV fault?
2022-08-15
A

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.

Q
How to deal with OV2 fault?
2022-08-15
A

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.

Q
How to deal with OV1 fault?
2022-08-15
A

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.

Q
How to deal with OC3 fault?
2022-08-15
A

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

Q
How to deal with OC2 fault?
2022-08-15
A

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.

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