Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE User Manual
Page 126
Span Your Valves
Chapter 9
9-9
ATTENTION: Be sure all machine guards and shields are in
place before proceeding.
Start by testing for maximum velocity and finding optimum values for
INC46 and INC48 .
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, you must
download INC first, followed by IPC (chapter 4).
To download : Set:
INC
B21/7
IPC
B21/8
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.