1) After the electric actuator receives the ON/OFF signal from the control system, the motor does not rotate and there is no humming sound. The possible reasons are: there is no AC power supply or the power supply cannot be applied to the motor part or the position locator part of the electric actuator; the PM amplifier board does not work properly and cannot send the corresponding control signal; the solid state relay is partially damaged, and the amplifier board cannot be sent. The weak signal is transformed into the strong electric signal required by the motor; the thermal protection switch of the motor is damaged; the torque limit switch is damaged; the travel limit switch is damaged; the manual/automatic switch position is selected incorrectly or the switch is damaged; the motor is damaged.
2) After the electric actuator receives the ON/OFF signal from the control system, the motor does not rotate and there is a buzzing sound. The possible reasons are: the starting capacitor of the motor is damaged; there is a slight short circuit between the turns of the motor coil; the power supply voltage is not enough.
3) After the electric actuator receives the on/off signal from the control system, the motor vibrates and clucks. The reason may be: the output signal of the PM amplifier board is not enough to make the solid state relay turn on completely, resulting in the loading voltage of the motor. Insufficient; the performance of the solid state relay deteriorates, causing its output terminal to not be fully turned on.
