Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE User Manual
Page 178
Span Your Valves
Chapter 9
9-21
4.
Enable set-output by changing DYC01-B08 (B34/392) from 0 to 1.
This forces the QDC module to apply the values in DYC09-12
directly to its outputs 1-4, respectively.
5.
Adjust the set-output value DYC09-12 (N40:121-124) that
corresponds to the selected ram (screw) pressure valve, and observe
actual pressure reported in SYS26 (N40:178).
For a bi-directional valve with a spool offset:
If this pressure is greater than zero, adjust the set-output value to
the ram (screw) pressure valve to obtain zero pressure. Stop the
adjustments when you observe the smallest pressure attainable.
For a uni-directional valve with no response at low signal level:
If this pressure is zero, adjust the set-output value to the ram
(screw) pressure valve until the observed pressure just exceeds
zero. Then re-adjust this value until you just observe zero again.
For a uni-directional valve with a pressure actual greater than
zero but with zero output to the valve: This is lowest pressure.
6.
Once satisfied that you obtained the lowest possible pressure or the
highest possible signal at zero pressure, copy the pressure observed in
SYS26 into INC41 (N44:37), the minimum pressure control limit.
7.
While maintaining this minimum pressure, observe the actual
set-output value in SYS41-44, (N40:193-196) that corresponds to
your ram (screw) pressure valve. Copy this value into INC43
(N44:39), the selected pressure valve output for minimum.
8.
Modify the value in DYC09-12 (N40:121-124) that corresponds to
the ram (screw) pressure valve in 5% steps while observing rising
pressure in SYS26 (N40:178). Stop adjusting it when the observed
pressure no longer increases with a change in the set-output value.
Now the pressure in SYS26 is the maximum obtainable pressure.
9.
Copy the pressure observed in SYS26 (N40:178) into INC42
(N44:38), the maximum pressure control limit.
10.
While maintaining this maximum pressure, observe the actual
set-output value in SYS41-44 (N40:193-196) that corresponds to your
ram (screw) pressure valve. Copy this value into INC44 (N44:40),
the selected pressure valve output for maximum.
11.
Disable set-output operation. Toggle DYC01-B08 (B34/392) to 0.
12.
Download your final values for INC41-44 to the QDC module.
Important: If downloading from your programming terminal, download
INC followed by IPC with download bits B21/7 and 8 (chapter 4).