Pulsafeeder Pulsa Series Pulsamatic Controls - Manual (Page 12)

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6. Adjust the “Ratio Zero” potentiometer on the circuit board (to the right of TB3) to +/- 0.0
volts.
7. With the voltmeter remaining as set up in step (5) above, set the control signal at the high end
(100%) and record the voltage.
8. Set up a voltmeter for CD voltage measurement between TB2-5 (positive) and TB2-1
(common).
9. Adjust the “LO” trim potentiometer on the circuit board to +/-0.0 volts.
10. Set up a voltmeter for DC voltage measurement between TB2-4 (positive) and TB2-1
(common).
11. Adjust the “HI” trim potentiometer on the circuit board to the high end voltage recorded in
setup (7) above.
12. The above adjustments are interactive. It may be necessary to repeat steps (8) through (12)
several times until the voltages stabilize. This completes coarse adjustment
With Ratio Control (Optional Feature) – Fine Adjustment
13. With the override switch still in the “out” or manual position start the pump.
14. Set up a voltmeter for DC voltage measurement between TB2-3 (positive) and TB2-1
(common).
15. Set the control signal at the low end (0%). Move the override switch to the “in” or auto
position. The “LO” drive LED will light and the pump will automatically adjust to 0% stroke.
16. Adjust the “LO” trim potentiometer on the circuit board to the voltage recorded in step (6).
The stroke indicator should now read 000-001 and both LED drive lights should be off.
17. Apply a high end (100%) control signal. Allow the pump to adjust to 100% stroke.
18. With the voltmeter remaining as set up in step (14) above, adjust the “HI” trim potentiometer
to the voltage recorded in step (7). The stroke indicator should now read 099-100 and again
both drive lights should be off.
19. The above adjustments are interactive. It may be necessary to repeat steps (12) through (16)
several times until the voltages stabilize. This completes fine adjustment.
5.3 Meter Readout Calibration
This procedure trims the current output to the calibrated range of pump capacity or stroke. Because
the output is based on position of the feedback potentiometer, an input signal is not required for
adjustment.
Depending on the options ordered an analog meter will have been supplied for signal indication. If
not, an amp meter will be required to measure the output, 0-10 mA standard, 4-20 mA optional.
1. With the pump set a zero stroke, adjust the “Meter Zero” potentiometer on the circuit board (to
the left of TB-3, as shown in Figure 4) for zero (0%) meter indication or 0% current level as
applicable. Note that with 4-20 mA output the “Meter Zero” and “Range” potentiometers will
be reversed.
2. Will the pump set at full stroke; adjust the “Range” potentiometer on the circuit board for
100% meter indication or 100% current level as applicable.
3. The above adjustments are interactive. Repeat steps (1) through (2) several times until the
meter accurately indicates both zero and full stroke settings.