1 action principle and structure analysis diagram 3610l series straight stroke electric actuator is 220v.ac as the driving power to accept the computer, regulator or operator 4 ~ 20ma.dc or 1 ~ 5v.dc input signal to work all-electronic Electric actuator. Electronic control unit made of integrated circuits, known as the control module, itself has a servo function. The input signal received by the control module is compared with and amplified by the opening signal of the opening detection section, and the motor is driven and controlled in the direction of eliminating the difference. Motor rotation through the drive pulley, synchronous belt pass to the passive pulley, the rotating sleeve rotation. The output shaft is provided with a rotation stop pin, so the rotation of the screw sleeve moves the output shaft up and down. With the opening detection unit for testing, through the rack gear transmission precision potentiometer. The operation of the precision potentiometer is converted into an electrical signal which is fed back to the control module section as an opening signal, with the result that the deviation between the signal from the computer regulator or operator and the opening signal is reduced. When the deviation is eliminated, the control section stops the motor in this position. Because the precision potentiometer uses the contactless plastic contactless plastic contact with a return spring, the backlash of the rack and pinion gear and the spur gear is canceled and the accurate position can be detected at any time, and the life of the precision potentiometer is longer than that of the Rao line potentiometer Several times longer, to ensure the reliability of the work. 2 Actuator Features ◎ can be overload protection unit. When the valve is stuck, or overload causes such as motor current is too large, the overload protection unit action cut off the motor current, play a protective role. After the fault is eliminated, the actuator can still work normally. ◎ Motor internal temperature protection switch. When the motor internal temperature exceeds the allowable temperature, the switch action automatically disconnect the winding power supply, thereby protecting the motor does not burn. ◎ Potentiometer adjustment zero, travel, sensitivity and ease of operation. ◎ Function switch arbitrarily choose positive and negative action, select the signal off the three states (self-locking, fully open, fully closed). ◎ Straight stroke actuator output shaft equipped with a compression spring to ensure that the valve closing force, the compression spring and the limit switch with the role, to ensure the close valve. ◎ power off, the valve self-locking. 3 actuator and valve connected to the commissioning of the external wiring connected actuator, check the control module function selection switch ①③ ④ should be in the off position, ② ⑤ ⑥ should be in the on position. With the signal generator to the actuator plus about 12ma signal, then connected 220v.ac power supply, began to adjust the actuator. 1 zero adjustment: loosen the lower limit switch cam screw, the limit switch placed in a natural state. Gradually reduce the input signal to 4ma, observe the actuator output shaft and stem position is appropriate, if appropriate, use open nut to connect the two, if not adjust the zero potentiometer. Clockwise adjustment, the actuator output shaft to go up, anti-clockwise actuator output shaft to go down. Until the position of the two is right, use open nut to connect the two well. 2 Stroke Adjustment: Release the upper limit switch cam screw and set the limit switch to the natural state. Gradually increase the input signal to 20ma, adjust the trip potentiometer. When the timing adjustment to increase the stroke, anti-clockwise stroke to reduce the stroke, until transferred to the desired stroke. 3 limit switch limit adjustment: Gradually reduce the input signal to 3.7 ~ 3.9ma, this time, the actuator output shaft and the connecting rod has a relative displacement of less than 1mm, the valve is closed, and then adjust ls1 limit switch cam, cam reverse After pressing the limit switch, fasten the cam screw. 4 upper limit limit switch adjustment: Gradually increase the input signal to 20.2 ~ 20.5ma, adjust ls2 limit switch cam, cam clockwise press limit switch, the fastening of the cam screw. Note: When adjusting the lower limit, adjust the signal to 3.7 ~ 3.9ma, press the cam ls1 to the pressure roller. If the signal is adjusted to 4ma, the cam is more accurate to the pressure roller. But after a period of zero drift occurred, if the zero drift to less than 4ma, as the above limit method without any negative impact; if zero drift to more than 4ma, such as 4.1ma, then consider the servo amplifier to accept 4ma regulation signal and 4.1ma Of the feedback signal, it will issue a signal to close the actuator valve, and at this time the actuator has been limited, can no longer be closed. In this case, the actuator motor always rotates and the motor is easy to burn out. This phenomenon should be avoided. So adjust the limit limit, the need to adjust the signal adjusted to 3.7 ~ 3.9ma to determine the position of the cam ls1. Similarly, when adjusting the upper limit limit, the adjustment signal needs to be adjusted to 20.1ma to determine the position of the cam ls2.