Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 158)

Span Your Clamp and Ejector Valves
Chapter 9
9-22
If the observed pressure OPS13 is still not representative of the setpoint
(within 20% of OPC13), your pressure valve is not linear over the desired
range of operation.
If: And Your
Selected Valve is:
Then:
OPS13 was less than OPC13 Direct Acting Increase FOC44, SOC44,
TOC44, and OSC44 by 5%
Reverse Acting Decrease FOC44, SOC44,
TOC44, and OSC44 by 5%
OPS13 was more than
OPC13
Direct Acting Decrease FOC44, SOC44,
TOC44, and OSC44 by 5%
Reverse Acting Increase FOC44, SOC44,
TOC44, and OSC44 by 5%
Repeat steps 2 through 5 as necessary.
What You Have Accomplished
The valve spanning procedure you just completed has:
defined the range of pressure available during any clamp open profile
informed the QDC module of the signal level needed to drive the
selected clamp pressure valve(s) for any requested open-loop pressure:
% of Signal Level Entered In: Drives the Selected Valve to Produce:
FOC43,SOC43,TOC43,OSC43 Pressure (Usually 0) in FOC41, SOC41, TOC41, and OSC41
FOC44,SOC44,TOC44,OSC44 Pressure in FOC42, SOC42, TOC42, and OSC42
Now, for all open-loop pressure-controlled clamp open profiles, the QDC
module:
drives the selected clamp pressure valve between the signal limits
imposed by FOC43 and FOC44, or SOC43 and SOC44, or TOC43 and
TOC44, or OSC43 and OSC44
assumes a linear relationship between clamp pressure and the signal
outputs
Set Pressure Alarm Setpoints
After spanning your Clamp Open pressure valve(s), set your Clamp Open
maximum pressure alarms (FOC57, SOC57, TOC57, OSC57) equal to
values you feel should not occur during the respective Clamp Open
profiles. Make sure none of these values are greater than their respective
Clamp Open Maximum Pressure Control Limits (FOC42, SOC42, TOC42,
OSC42). Entering a value of 0 disables this alarm.
Download changes to the QDC module. If necessary, refer to the
Download Procedure in chapter 4.