1. Adjusting the Fine-Tuning Electrical Limit
Full Close Adjustment:
Use the handle to drive the valve to the fully closed position.
Loosen the scale plate locking screw and adjust the scale plate so that the pointer aligns with the 0 mark (SHUT direction). Then, tighten the screw.
Using a 2mm hex wrench, turn the closing adjustment shaft (S) clockwise until the travel stop D1 rotates clockwise and triggers K2 and K1 sequentially, making a clicking sound.
Stop turning when K1 clicks, completing the full-close position adjustment.
Full Open Adjustment:
Use the handle to drive the valve to the fully open position so the pointer aligns with the 0 mark (OPEN direction).
Use a 2mm hex wrench to turn the opening adjustment shaft counterclockwise until travel stop D2 rotates counterclockwise and triggers K4 and K3 sequentially.
Stop adjusting when K3 clicks, completing the full-open position adjustment.
2. Adjusting the Intermediate Position Electrical Limit
D1 Adjustment (Full Close Position):
Move the valve to the fully closed position and align the pointer with 0 (SHUT direction).
Desserrer le D1 travel stop screw, rotate D1 clockwise, and stop when K1 clicks.
Tighten the D1 screw to secure the travel stop.
D2 Adjustment (Full Open Position):
Move the valve to the fully open position and align the pointer with 0 (OPEN direction).
Desserrer le D2 travel stop screw, rotate D2 counterclockwise, and stop when K2 clicks.
Tighten the D2 screw to secure the travel stop.
D3 & D4 Adjustments (Intermediate Positions):
Move the valve slightly away from full open or full close by 2 degrees using the handle.
Adjust D3 counterclockwise (for closing direction) until K3 clicks, then lock it.
Adjust D4 clockwise (for opening direction) until K4 clicks, then lock it.
Special Note:
If the valve’s full-open and full-close positions do not match the actuator’s, adjust according to steps 1 or 2 above.
Intermediate limit switches provide dry contact signals, while full-open/full-close limit switches control the valve position.
Models A, C, E, and F do not have intermediate limit switches or travel stops.
3. Adjusting the Potentiometer (For C & D Models)
Move the actuator to the 50% position (midway).
Ensure the potentiometer gear properly meshes with the position gear (gear fixing screw facing outward for easy tightening).
Measure the resistance between terminals 1 and 3 of the potentiometer with a multimeter and record the value R.
Connect the multimeter to terminal 2 and any other terminal, then slowly turn the potentiometer shaft.
Stop when the reading reaches R/2 ±2Ω, then lock the gear fixing screw.
Special Note:
- E-model actuators do not have limit switches or travel stops.
- Do not adjust the potentiometer or gears unless necessary.
4. Adjusting the Mechanical Limit Stops
Move the valve to the position complètement fermée until the K1 limit switch clicks.
Desserrer le right-side locking nut and turn the closing limit screw clockwise until it just touches the mechanical stop.
Then, turn the screw half a turn counterclockwise so the mechanical stop is 2.5° behind the electrical limit. Tighten the nut.
Repeat the same steps for the position complètement ouverte on the left side.
Special Note:
- The mechanical limit must be slightly behind the electrical limit (see Diagram 9).
- If the mechanical stop is too early ou aligned with the electrical limit, the motor may stall, overheat, or even burn out.
5. Test running
Correctly wire the actuator according to the control circuit diagram inside the cover.
Turn the switch to “Close” → The actuator drives the valve clockwise to close jusqu'à K1 clicks and stops.
Turn the switch to “Open” → The actuator drives the valve counterclockwise to open jusqu'à K3 clicks and stops.
If the indicator scale does not match the actual valve position, loosen the central scale plate screw and realign it for accurate positioning.
