10
Following is the procedure of “close direction” exact adjusting as an example.(including two cases)
a. When the valve close position is not reached (after power-operated), properly actuate the valve manually
to reach the close position from the initially adjusted position. Screw out “Adjusting screw” No.5 to make it
internal gears disengaged. Now the rotor switch 8A-8B is in “OFF” position, carry out adjusting and
inspection according to the second case in 8.1d-e.
b. After the valve is closed, the T.SW acts, but the rotor switch 8A-8B is in “ON” position. If T.SW act is
unwanted, it is possible to actuate the valve manually toward open direction and reaches the reasonable
position under the prerequisite to ensure the valve is closed. Screw out “Adjusting screw” NO.(5) and make
the internal gears disengaged. Up to now, 8A-8B is in “ON” position, so should carry out adjustment and
inspection accord to 8.1d-e, first case.
(Caution: Screw out “adjusting screw” No.(5) after finishing the adjustment.)
The exact adjusting means: When the valve switch does not reach “ON” or “OFF” position, adjust the rotor
switch slightly delay and make it disconnected. If the valve switch slightly over “ON” or “OFF” limit, should
turn the rotor switch a little advance to cut off.
Sometimes only need to turn adjusting axle a little angle, 1~2 gears on the counter unit-digit gear.
8.4 Adjustment the intermediate position of valve (Adjustment of rotor of row 2 and row 3).
The position of rotor switch row 2 and row 3 shall be set as requirements. They can be used as terminal
signal output, and can also be used as intermediate position signal output. Procedure of adjusting of above
mentioned two row rotor switch please refer to the contents of 8.1-8.3 section.
9. Adjustment of position indicating system(MDPI)
Refer to MDPI mechanism is shown in Fig 19 during adjustment.
The gear of potentiometer of the actuator is out of meshing when delivered.
9.1 Adjustment of “0” position for valve close;
After G.L.S.W is adjusted (or when it is being adjusted), drive the valve to its close position electrically.
Loosen the fix screw of the pointer of mechanical indicator and se the pointer in “0” position, and then tighten
the fix screw.
Turn the movable arm of the potentiometer to its initial position and turn it back a little. This location is the
zero position of the potentiometer, loosen the screw on the gear of potentiometer and push the gear into
meshing position, and then tighten the screw again. (In this design, the rotation direction of the movable arm
of potentiometer and that of the pointer of position indicator are the same. Therefore the zero position of the
potentiometer is consistent with that indicated by the pointer of indicator.)
9.2 Adjustment of valve open 100% position.
When driving the valve electrically to full open position, the pointer should be in the point 100%. If any
slight deviation exists, move the pointer to correct position. If much deviation exists, adjust the valve open
position corrected. If the deviation is too much, it is necessary to inspect for mistakes in model selection or in
manufacturing.
9.3 Inspection
The inspection of the position indicator system includes G.L.S.W contact signal.
After the valve is driven to close position and stops automatically, now the pointer of MDPI should be in “0”
position and the valve open indicator lamp is lighted up.
After the valve is driven to open position and stops automatically, now the pointer of MDPI should be in
“100%” position and the valve open indicator lamp is lighted up.
The pointer of the position indicator on the controller should be in corresponding position when it is in
“ON” “OFF” position. If not, it can be adjusted by the potentiometer that located on controller.
10. Adjustment of torque switch mechanism (T.SW)
The adjusting section of the torque switch shown in Fig 15.
The output torque values (MK) in both open and close direction are controlled by T.SW that was set before
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