| 摘要 |
PURPOSE: A remote open ratio signal adjusting apparatus for an electronic drive valve is provided to be capable of decreasing measuring error by employing a method expanding the measuring resistance value range of a potentiometer. CONSTITUTION: AC voltage is applied to a motor(M) driving the electronic drive valve through a main control board(MCB). Switch(CT/LS) senses the close torque of the valve, switch(OT/LS) sense the open torque, intermediate switches(ISA1-ISA4) sense the intermediate torque, and a push button(23) commands the opening/closing of the electronic drive valve. A potentiometer(24) detects the open ratio of the valve using the resistance of a variable resistor correlated with a gear mechanism determining the open ratio of the valve. In the potentiometer(24), a sub variable resistor is serially connected to an existing measuring variable resistor(24-0).
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