Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE User Manual
Page 221
Span Your Valves
Chapter 9
9-55
5.
Observe the pressure reported in SYS26 (N40:178).
For a bi-directional valve with a spool offset:
If this pressure is greater than zero, adjust the selected valve
set-output value to obtain zero pressure. Stop adjusting it 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 selected valve set-output value
until the observed pressure just exceeds zero. Then re-adjust it
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 you obtained the lowest possible pressure or
the highest possible signal at zero pressure, copy the pressure
observed in SYS26 (N40:178), (usually 0 PSI or Bar) into EAC41
(N45:37), the minimum pressure control limit.
7.
While maintaining this minimum pressure, observe the actual
set-output value in SYS41-SYS44 (N40:193-196) that corresponds to
your selected ejector advance pressure valve. Copy this value into
EAC43 (N45:39), the selected pressure valve, output for minimum.
8.
Change the set-output value in DYC09-12 (N40:121-124) that
corresponds to the selected ejector pressure valve by 50%, and then in
5% increments while observing the ejector pressure in SYS26. Stop
adjusting it when the observed pressure no longer increases with an
increase in the set-output value. The pressure now observed in
SYS26 is the maximum obtainable ejector pressure.
9.
Copy this observed maximum pressure from SYS26 (N40:178) into
EAC42 (N45:38), the maximum pressure control limit.
10.
While maintaining this maximum pressure, observe the actual valve
set-output value in SYS41-SYS44 (N40:193-196) that corresponds to
your selected pressure valve. Copy this value into EAC44 (N45:40),
the selected pressure valve, output for maximum.
11.
Lower the set-output value in DYC09-12 corresponding to the
selected ejector pressure valve to a safe level.