Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 183)

Span Your Valves
Chapter 9
9-26
Find optimum values for INC46, 48
1. Jog the ram (screw) all the way to the backpoint position.
2. Set machine hydraulics to simulate injection. Enable pumps and
align valves to their normal state during injection.
3. Run an open-loop velocity vs. position injection profile by toggling
DYC02-B04 (B34/404) from 0 to 1 to 0.
4. The QDC module automatically runs the injection, pack, and hold
profiles in succession. At completion, observe the maximum
segment velocity reported by the QDC module in IPS09, 13, 17, 21,
25. . . (N44:601, 605, 609, 613, 617, 621, 625, 629, 632, 637, or 641)
for all segments of the profile. Record the highest reported velocity.
5. With your programming terminal, enter the highest velocity from step
4 into INC46 (N44:42) the maximum velocity control limit.
6. Change all profile velocity setpoints to the value in INC46. Do this
in IPC09, 13, 17, 21, 25, 29, 33, 37, 41, 45, and 49
(N44:65, 69, 73, 77, 81, 85, 89, 93, 97, 101, and 105).
7. Download these values to the QDC module.
Important: If downloading from your programming terminal, download
INC first, followed by IPC (chapter 4).
To download : Set: B21/
INC 7
IPC 8
8. Re-run the profile and verify that segment velocity actuals are about
equal to segment setpoints.
9. Modify (in the proper direction for flow reduction) the value in
INC48 (N44:44) in 5% increments until you observe the highest
velocity referred to in step 4. To do this, enter a new value in INC48
and repeat steps 7, 3, 4, and 9 as needed. INC48 is the selected
velocity valve, output for maximum.
10. After reaching the point where the maximum velocity starts to
decrease, change the signal in INC48 just enough to restore the
highest velocity referred to in step 4. Enter a new INC48 and repeat
steps 7, 3, and 4 one last time.