1. Torque maintenance refusal
To measure the output torque of the electric actuator, there are mainly mechanical maintenance switches, motor current and voltage power measurement and calculation torque, and sensor-type maintenance devices: mechanical torque maintenance switches are used more before 2000, which is a transitional product, and now some low-end electric actuators are still used, and this kind of torque maintenance switch can only supply the switching quantity for torque maintenance, and cannot supply real-time data of process torque, and the measurement error is large; The torque is calculated using the motor current voltage and the phase angle between the current voltage, which requires a software program to complete; The sensor-type torque maintenance device combines the axial deformation of the first-stage worm of the electric actuator with the pressure sensor, expands the voltage output by the pressure sensor through the circuit board, and then inputs the signal to the control motherboard, and then obtains the real-time torque value of the electric actuator.
The torque maintenance refusal is mainly manifested in the tripping of the AC power supply of the actuator, the serious wear of the worm gear and worm of the electric actuator, the bending and deformation of the door rod, and even the twisting of the connecting screw between the electric actuator and the valve. When the valve torque is selected, it is necessary to ensure that the actuator is firmly open and close the valve, and the torque of the electric actuator is required not to exceed the maximum torque that the valve door lever can accept, and there must be difficulties in parameter setting, because the maximum torque that each valve door lever can accept is often not easy to obtain, and the electric actuator uses the manufacturer to set the torque parameters according to experience, first set the small torque maintenance value, and then increase the torque maintenance parameter setting appropriately if the torque maintenance action, Until the valve can be opened and closed normally in the cold state, if the torque maintenance action is in the hot state, continue to increase the torque maintenance value appropriately to ensure that the valve can be opened and closed normally in the hot state.
2. Torque maintenance misoperation
In the case that the manual operation of the electric actuator is light, the over-torque maintenance action is presented, and the sweeping torque maintenance value is set too small, for the intelligent electric actuator, observe the torque value prompt of the LCD screen or the indicator light shows the over-torque information, and by turning in the opposite direction, the over-torque signal in the original direction should disappear. Otherwise, the motherboard or torque detection device should be replaced and swept one by one.
Regarding the mechanical torque detection device, turn the motor actuator in the opposite direction, and check that the torque switch should be disconnected, otherwise, the torque maintenance switch should be replaced; If the moment holder has been set to the maximum value and still shows excessive torque, it should be considered whether the torque selection of the electric actuator is too small.
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