Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 187)

Tune Your Machine
Chapter 10
10-14
If you believe your Unselected Valve Set-output Values are adversely
affecting your ability to obtain quality closed-loop control:
If your Selected
valve controls:
And you observe: Then:
Pressure Profile segment pressures
substantially greater than
setpoint
Decrease the flow available during the
profile by appropriately modifying the
setĆoutput value driving the flow valve.
Pressure Profile segment pressures
substantially less than
setpoint
Increase the flow available during the profile
by appropriately modifying the setĆoutput
value driving the flow valve.
Velocity Profile segment velocities
substantially greater than
setpoint
Decrease the pressure available during the
profile by appropriately modifying the
setĆoutput value driving the pressure valve.
Velocity Profile segment velocities
substantially less than
setpoint
Increase the flow available during the profile
by appropriately modifying the setĆoutput
value driving the pressure valve.
Logical Bridging and EndĆof Profile (Stroke) SetĆoutput Values
The default configurations entered in chapter 8 instructed you to “logically
bridge” all of your clamp profiles. This had the effect of forcing your
QDC module to run each successive profile upon completion of the
previous in each direction of movement.
If required by your application, you may configure your QDC module to
“stop” upon completion of any profile (stroke) and provide fixed, defined
signals to each of its four outputs while awaiting further commands from
your PLC processor. Disabling logical bridges and configuring End-of
Profile (Stroke) Set-output Values allow you to apply voltages (currents) at
each of the outputs after successful completion of any profile (stroke).
Recall in chapter 9 that we used End-of Low Pressure Close Set-output
Values to achieve tonnage on hydraulic clamps and holding pressure on
toggle clamps.
End-of Profile (Stroke) Set-output Values have many potential uses.
Among them:
Setting cores between clamp close profiles
Pulling cores between clamp open profiles
Third plate drop-off and pick-up
Building tonnage/holding pressure on the clamp prior to injection