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Ordinary motor can realize variable frequency speed regulation. However, it is not recommended to use it under low frequency (below 30Hz) for a long time to avoid the rise of motor temperature.

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.

3% to 4%

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

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.