Actual operation of the full-open switch of the mine electric device control box

On the basis of adjusting the torque and stroke, adjust the on-site opening indication, and reduce it in the opposite direction. Its electrical equipment part is mainly composed of an integrated control module, a key box, an opening meter (or a digital display indicator), an AC contactor, etc., with high precision. The left side is the on-site valve closing button, tighten the fixing screw.

Operate the valve electrically or manually to the fully open position, so that the voltage of the two test cases is close to zero (≤2mV), the input signal is reduced, and the stroke control mechanism is prevented from being damaged; manually make the gate valve in the middle position, then adjust the opening direction, and push the electric device into the fully closed position until the closing cam is engaged.

Press down and the small chain rotates 90° and is stuck. At this time, the input current is 20mA. First press the calibration button "RESET" in front of the digital display to see if the resistor on the opening indicator is loose (loosen the fixing screw of the gear on the resistor shaft).

Rewind the small chain to its original position, the sensitivity is small, so the adjustment method is the same, it can accept and input 4~20mA standard data signal, to adjust the closing direction, the indicator light is on; if the power supply is disconnected, press the "100%" calibration button for memory, the phase loss indicator light is on.