Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 165)

Span Your Clamp and Ejector Valves
Chapter 9
9-29
If this pressure is zero, marginally adjust the selected Ejector
Advance valve set-output value until the observed pressure
feedback just becomes greater than zero, and then re-adjust the
value until you just observe zero again. This procedure may be
required on a uni-directional valve with no response at low signal
levels.
6. Once you are satisfied you have obtained the lowest possible pressure
(bi-directional valve), or the highest possible signal at zero pressure
(uni-directional valve), copy the pressure observed in SYS26 (usually
0 PSI or Bar) into EAC41 (Pro-Set 600 address N45:37), the
Minimum Ejector Advance Pressure Control Limit.
7. While maintaining this minimum pressure, observe the actual valve
set-output value in the System Status Block (SYS41-SYS44, Pro-Set
600 addresses N41:193-N41:196) that corresponds to your selected
Ejector Advance pressure valve. Copy this value into EAC43
(Pro-Set 600 address N45:39), the Selected Ejector Advance Pressure
Valve Output for Minimum.
8. Begin increasing the selected Ejector Advance valve set-output value
in 5% increments while observing the ejector pressure in SYS26.
Stop adjusting the value when the observed ejector pressure no longer
increases with an increase in the set-output command value. The
pressure now observed in SYS26 is the maximum obtainable Ejector
Advance pressure.
9. Enter this observed maximum Ejector Advance pressure (from
SYS26) into EAC42 (Pro-Set 600 address N45:38), the Maximum
Ejector Advance Pressure Control Limit.
10. While maintaining this maximum Ejector Advance pressure, observe
the actual valve set-output value in the System Status Block
(SYS41-SYS44, Pro-Set 600 addresses N41:193-N41:196) that
corresponds to your selected Ejector Advance pressure valve. Copy
this value into EAC44 (Pro-Set 600 address N45:40), the Selected
Ejector Advance Pressure Valve Output for Maximum.
11. Disable set-output by transitioning DYC01-B08 (Pro-Set 600 address
B35/392) from a 1 to a 0.
12. Download your changes to the QDC module (refer to chapter 4 for
detailed instructions).