Span Your Valves
Chapter 9
9-12
What You Have Accomplished
The valve-spanning procedure you just completed has defined the:
range of ram (screw) velocity during any injection profile
end-of-range maximum and minimum signal levels for linear control of
the injection velocity valve in open-loop control
For this
range limit
When trying to obtain
the velocity in:
The QDC module drives the selected
velocity valve to % output signal in:
Minimum
INC45
INC47
Maximum
INC46
INC48
Now for all open-loop injection velocity profiles, the QDC module
assumes a liner relationship between ram velocity and signal output.
Note that there are no velocity profile alarms.