Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE User Manual
Page 141
Span Your Clamp and Ejector Valves
Chapter 9
9-5
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 LPC 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 LPC41 (Pro-Set 600 address N43:217), the Low
Pressure Close Minimum 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
LPC valve. Copy this value into LPC43 (Pro-Set 600 address
N43:219), the Selected Low Pressure Close Valve Output for
Minimum.
8.
Begin increasing the selected LPC valve set-output value in 5%
increments while observing the clamp pressure in SYS28. Stop
adjusting the value when the observed clamp pressure is equal to the
maximum low pressure close pressure that you run on this machine.
In most cases, this value is substantially less than the maximum
obtainable system pressure.
9.
Enter this observed maximum low pressure close pressure (from
SYS28) into LPC42 (Pro-Set 600 address N43:218), the Maximum
Low Pressure Close Control Limit.
10.
While maintaining this maximum low pressure close 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 LPC valve. Copy this value into LPC44
(Pro-Set 600 address N43:220), the Selected Low Pressure Close
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 LPC changes to the QDC module (refer to chapter 4
for detailed instructions).