Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 156)

Span Your Clamp and Ejector Valves
Chapter 9
9-20
ATTENTION: A value of 0 entered in your data table does not
necessarily correspond to zero pressure or flow. For example, a
bi-directional valve would require a set-output value of 50%
(5000) to obtain 0 PSI. Amplifier electronics or valve spools
may also be designed such that 0 volts signal input does not
correspond to no flow or pressure. Please consult your valve
and amplifier specifications for more details.
4. Enable set-output by transitioning DYC01-B08 (Pro-Set 600 address
B35:392) from a 0 to a 1.
5. Observe the pressure reported back in SYS28 (Pro-Set 600 address
N41:180).
If this pressure is greater than zero, marginally adjust the selected
Clamp Open valve set-output value in an attempt to obtain zero
pressure feedback. Stop the adjustments when you observe the
smallest pressure attainable. This procedure may be required on a
bi-directional valve with a spool offset.
If this pressure is zero, marginally adjust the selected Clamp Open
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 SYS28,
(usually 0 PSI or Bar) into FOC41, SOC41, TOC41, and OSC41
(Pro-Set 600 addresses N43:337, N43:397, N43:457, and N43:517),
the Clamp Open Minimum Pressure Control Limits.
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
Clamp Open pressure valve. Copy this value into FOC43, SOC43,
TOC43, and OSC43 (Pro-Set 600 addresses N43:339, N43:399,
N43:459, and N43:519), the Selected Pressure Valve Outputs for
Minimum.
8. Begin increasing the selected Clamp Open valve set-output value in
5% increments while observing the clamp pressure in SYS28. Stop
adjusting the value when the observed clamp pressure no longer
increases with an increase in the set-output command value. The
pressure now observed in SYS28 is the maximum obtainable Clamp
Open pressure.