Pulsafeeder Pulsa Series Pulsamatic Controls - Manual (Page 15)

12
6.3 Zero Alignment
The actuator mechanism must be aligned relative to the pump drive in order to permit the full
range of stroke adjustment.
Preliminary Check
1. Set up a multimeter for resistance measurement across the limit switch (in subassembly #635,
Figure 6 or 7) closest to the circuit board.
2. Turn the handwheel clockwise to decrease pump stroke length until the meter indicates an
open switch. Record the mechanical stroke indicator reading at this point. Continue decreasing
stroke length until resistance is encountered. Record stroke indication at this point as well. If
the stroke can be decreased to the resistance point without opening the switch, jump to Step 4.
Otherwise proceed with Step 3.
3. If resistance was felt at 000 on the stroke indicator and if the switch opened at a stroke higher
than 000 but not above 003, zero alignment is correct and no further action is required. If not,
proceed with re-alignment as outlined below.
Re-alignment –Non-explosion Proof
1. Disconnect the power source to the drive motor and actuator.
2. Remove the screws to the rear gearbox cover, Item #526A. Refer to Figures 8 and 9.
3. Lift the cover slightly and hold the diamond screw shaft Item #657, horizontal to prevent
binding. Pull the cover back towards the motor until the shaft is disengaged from the actuator
drive sleeve, Item #621.
4. Check to see that the block, Item #352, inside the oscillating housing, Item #358 is at the top
by turning the miter gear Item #357 clockwise. Refer to Figure 5.
5. Set the stroke indicator two digits lower than the setting at which the limit switch opened (see
Step 2 of “Preliminary Check”).
6. If he diamond shaft is dry, lightly coat it with grease.
7. Hold the cover over the pump and carefully insert the shaft into the actuator drive sleeve as
you lower the cover in place. Be sure that the stroke indicator remains as set in Step 5.
8. Replace the cover screws.
9. With the handwheel fully clockwise, the stroke position indicator show read (000). If not,
remove the handwheel assembly form the cover assembly, turn to the (000) setting and
replace.
10. Align the potentiometer as described under “Repairs”.
11. Confirm free operation of mechanism and limit switch setup, as described under “Installation”.
Re-alignment –Explosion Proof
1. Disconnect the power source to the drive motor and actuator.
2. Remove the screws to the rear gearbox subcover, Item #529A. Refer to Figures 8 and 9.
3. Manually rotate the motor coupling until the oscillating housing is vertical. It may be
necessary to remove pressure from the piping system.