Shot Calibration - Graco PR70 Operation & Maintenance Manual

Setup

Shot Calibration

To dispense accurate quantities of material, a few small
and large calibration shots must be performed. Once the
weights are entered, the machine will calculate an aver-
age weight for the small and large calibration shots.
Prepare for Calibration
1. Verify the piston position is calibrated. See Piston
Position Calibration, page 38.
2. Verify the dispense head is properly primed. See
Prime the Dispense Head, page 40.
3. Verify the machine is properly phased. See Phas-
ing Adjustment, page 41.
4. Verify the dispensing ratio is adjusted as needed.
See Calibrate Dispense Weight Ratio (PR70v
only), page 45.
5. Retrieve multiple waste containers.
6. Locate a weigh scale near the machine.
7. Install a static mixer.
8. Prime the dispense head. See Prime the Dispense
Head, page 40.
9. Clean the surface below static mixer of any debris
or materials that might cling to the waste container
and affect weight measurements.
10. Navigate to the Calibration screen. See Screen
Navigation Diagram, page 17.
Perform Small Calibration Shots
11. Press Small Calibration Shot button (
calibration mode.
12. Use the numeric keypad to enter the ratio arm set-
ting. Valid entries are 1.0 to 2.0 in 0.1 increments.
13. Press the Enter button (
14. Weigh one clean waste container and tare the
scale.
15. Place container under static mixer.
16. Press the Start/Stop Shot button (
footswitch to dispense material.
48
) to enter
) to accept the value.
) or the
17. Weigh container.
18. Enter weight in grams using numeric keypad.
19. Press the Enter button (
or press the "0" button on the numeric keypad
repeatedly to clear out the entry then re-enter.
20. Repeat steps 14 through 19 as needed. Graco rec-
ommends repeating steps 14 through 19 at least
four more times. The machine will automatically cal-
culate the average weight of the calibration shots.
21. Press Small Calibration Shot button (
calibration mode.
Perform Large Calibration Shots
22. Press Large Calibration Shot button (
calibration mode.
23. Weigh one clean waste container and tare the
scale.
24. Place container under static mixer.
25. Press the Start/Stop Shot button (
footswitch to dispense material.
26. Weigh container.
27. Enter weight in grams using numeric keypad.
28. Press the Enter button (
or press the "0" button on the numeric keypad
repeatedly to clear out the entry then re-enter.
29. Repeat steps 23 through 27 as needed. Graco rec-
ommends repeating steps 23 through 27 at least
four more times. The machine will automatically cal-
culate the average weight of the calibration shots.
30. Press the Large Calibration Shot button (
exit calibration mode.
) to accept the number
) to exit
) to enter
) or the
) to accept the number
) to
312759W