10
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.
6. Repairs
6.1
Limit Switch Adjustment
This procedure adjust the limit switches to prevent the pump mechanism from jamming
due to over travel, without significantly restricting the range of stroke length settings.
The limit switches disable the actuator from operating below zero strokes or above full
stroke, either of which can cause jamming. For this reason, correct limit switch
adjustment is very important.
The procedure for checking limit switch adjustment is given under “Installation- Start Up”.
As stroke length is manually decreased, the switch closest to the circuit board should
open (disabling decrease clutch voltage) at as stroke indicator reading between (001) and
(000). This reading must not be below (000). As stroke length is manually increased, the
switch farthest from the circuit board should open (disabling increase clutch voltage) at a
stroke indicator reading between 099 and 100. This reading must not be above 100.
To adjust a limit switch, loosen its two mounting screws, slide it in the required direction
and tighten the screws. Verify the adjustment as described under “Installation- Start Up”.
6.2
Potentiometer
1. Record the color codes of the potentiometer leads to TB2-3, 4, and 5, and disconnect
them from TB2.
2. Verify full potentiometer resistance of approximately 1000 ohms between the leads
removed from pins 4 and 5.
3. A needle type (analog) meter is recommended for checking potentiometer operation.
As the potentiometer gear is turned counterclockwise, the resistance between leads
Summary of Contents for PULSAmatic 7120
Page 5: ...2...
Page 20: ...17 Figure 5 AP00229...
Page 23: ...20 Figure 6 Standard NEMA 4 ENCLOSURE...
Page 25: ...22 Figure 7 EXPLOSION PROOF ENCLOSURE AP00334 AP00333...
Page 27: ...24 Figure 8 MODELS 7120 AND 7440 AP00330...
Page 30: ...27 Figure 9 MODELS 7660 AND 8480...
Page 33: ...30...