Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE User Manual
Page 162
Span Your Valves
Chapter 9
9-5
4.
Enable set-output by changing DYC01-B08 (B34/392) 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 clamp LPC valve, and observe the
pressure reported in SYS28 (N40:180).
For a bi-directional valve with a spool offset:
If this pressure is greater than zero, adjust the set-output value to
the clamp LPC 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 clamp
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 you are satisfied that you obtained the lowest possible pressure
or the highest possible signal at zero pressure, copy the pressure
observed in SYS28 (N40:180) into LPC41 (N43:217), the LPC
minimum control limit.
7.
While maintaining this minimum pressure, observe the actual
set-output value in SYS41-44 (N40:193-196) that corresponds to your
clamp LPC valve. Copy this value into LPC43 (N43:219), the
selected LPC valve, output for minimum.
8.
Change the set-output value in DYC09-12 (N40:121-124) that
corresponds to the clamp LPC valve in 5% steps while observing the
pressure in SYS28 (N40:180). Stop adjusting it when the observed
pressure is equal to the maximum LPC pressure that you run on this
machine. In most cases, this value is substantially less that the
maximum obtainable system pressure.
9.
Copy this observed maximum LPC pressure from SYS28 (N40:180)
into LPC42 (N43:218), the maximum LPC control limit.
10.
While maintaining this maximum LPC pressure, observe the actual
set-output value in SYS41-44 (N40:193-196) that corresponds to your
selected clamp LPC valve. Copy this value into LPC44 (N43:220),
the selected LPC valve, output for maximum.
11.
Lower the set-output value in DYC09-12 corresponding to the
selected clamp LPC valve to a safe level.
12.
Disable set-output operation. Toggle DYC01-B08 (B34/392) to 0.