Pulsafeeder Pulsa Series Pulsamatic Controls - Manual (Page 13)

10
5.4 Auto-Manual Calibration
This procedure trims the manual control potentiometer to the low and high ends o the actual input
control signal.
The main circuit board must be calibrated prior to this procedure.
For current type control signals, a resistor is installed across terminals of the auto-manual switch.
If present, this resistor must remain in place.
This procedure can be performed with the pump on-line and operating, in the manual (handwheel)
control mode, with the override switch in the “out” position.
1. All voltages in this procedure are DC and are measured between TB2-2 (positive) and TB2-1
(common).
2. Set the remote auto-manual selector switch to the “Auto” position.
3. Set the control signal to the low end and record voltage.
4. Set the control signal to the high end and record voltage.
5. Set the remote selector switch to the “manual” position.
6. Set the remote “percent stroke” control potentiometer at zero percent.
7. Adjust the “LO” trim potentiometer on the small circuit board mounted on the back of the
“percent stroke’ potentiometer for the low end voltage recorded in step (3) above. Verify that
both LEDS on the main circuit board are off.
8. Set “percent stroke” potentiometer at 100%.
9. Adjust the “HI” trim potentiometer on the small circuit board on back of “percent stroke”
potentiometer for high end voltage recorded in step (4) above. Verify that both LEDS on main
circuit boards are off.
10. The above adjustments are interactive. It may be necessary to repeat steps 6 through 9 several
times, until the voltages stabilize.