Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE - Manual (Page 127)

Span Your Valves
Chapter 9
9-10
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.
Next, determine INC47, Selected Velocity Valve, Output for Minimum.
1. Enter new velocity setpoints equal to 1/10 maximum velocity
(0.10 times the velocity in INC48) in these words:
IPC09, 13, 17, 21, 25, 29, 33, 37, 41, 44, and 49
(N44:65, 69, 73, 77, 81, 85, 89, 93, 97, 101, and 105)
2. Download the INC and IPC blocks 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
3. Run another open–loop velocity vs. position profile. Do this 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 actual segment
velocities reported by the QDC module in IPS09, 13, 17, 21, 25 . . .
(N44:601, 605, 609, 613, 617, 621, 625, 629, 633, 637, and 641)
for all segments of the profile. Expect about 10% of maximum.
If observed velocities are at least 20%: Then change INC47 (N44:43) as follows:
Greater than or equal to setpoints in step 1 Make no further adjustments at this time.
Below setpoints in step 1 Modify the signal in 5% steps until actual
velocities equal setpoints in step 1.
To do this, enter a new value in INC47 and
repeat steps 2Ć4 as needed.
5. After reaching the point where minimum velocities start to exceed
setpoints in step 1, change the signal in INC47 just enough so actual
velocities equal setpoints in step 1. To do this, enter a final INC47
and repeat steps 2-4 one last time.