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SPTM-5V series
5. Adjustment
5.1
Setting Point Switch
SPTM-5V series can be calibrated in 2 or 5 points setting.
a) 2 Point Setting:
By setting minimum and maximum points <0% and 100% of valve stroke>, in-b
b) 5 Point Setting
By setting 5 points <0%, 25%, 50%, 75%, and 100%> the outputs can be set accordingly.
5.2
Adjustment - Calibration
a) Input 4mA signal to the positioner to move the valve stroke to the 4mA position.
b) After the valve reaches at the 4mA position, press “4mA button for 3-4 seconds. The
lamp will be lighted, and this indicates that 4mA output
feedback position has been calibrated.
c) Please repeat above step for 8mA, 12mA, 16mA, and
20mA for 5 point setting. For 2 point setting, repeat
above step for 20mA only.
5.3
Adjustment – Potentiometer
Potentiometer is designed to output 12mA signal when the feedback lever is at 50% position.
In case of dislocation of the potentiometer, please follow below procedure to re-set the
potentiometer.
Power must be turned off before adjusting potentiometer.
Please be cautious when adjusting potentiometer.
Please make sure that there is no remaining circuit on the PCB.
Please do not use excessive force when disconnecting potentiometer from the PCB.
1. Locate the potentiometer under the PCB. Disconnect from the PCB. Please do not use
excessive force.
2. Unfasten lock screw which locks the potentiometer gear and take out potentiometer body
from the lag-gear.
3. Fix the feedback lever at 50% position and measure resistance level by connecting two
probes out of three inlets.
4. Rotate pinion gear until resistance vale is about 5K
Ω
.
5. After setting the resistance value, rotate stopper to the normal position an fasten the lock
screw.
6. Reconnect potentiometer to the PCB and reinstall PCB onto SPTM-5V body.
