Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 153)

Span Your Clamp and Ejector Valves
Chapter 9
9-17
If the actual velocity is still not representative of your setpoint, your flow
valve is not linear over the range of your setpoint
If: And your
Selected Valve is:
Then:
CPS12 was less than CPC12 Direct Acting Increase FCC48, SCC48, and TCC48 by 5%
Reverse Acting Decrease FCC48, SCC48, and TCC48 by 5%
CPS12 was more than
CPC12
Direct Acting Decrease FCC48, SCC48, and TCC48 by 5%
Reverse Acting Increase FCC48, SCC48, and TCC48 by 5%
Repeat steps 3 through 6 as necessary.
What You Have Accomplished
The valve spanning procedure you just completed has:
defined the range of velocity available during any clamp close profile
informed the QDC module of the signal level needed to drive the
selected clamp velocity valve(s) for any requested open-loop velocity:
% of Signal Level Entered In: Drives the Selected Valve to Produce:
FCC47, SCC47, TCC47 Velocity (usually 0) in FCC45, SCC45, and TCC45
FCC48, SCC48, TCC48 Velocity in FCC46, SCC46, TCC46
Now, for all open-loop, velocity-controlled clamp close profiles, the QDC
module:
drives the selected clamp velocity valve between the signal limits
imposed by FCC47 and FCC48, or SCC47 and SCC48, or TCC47 and
TCC48
assumes a linear relationship between clamp speed and the signal
outputs