Instruction Manual

Tune Your Machine for Producing Parts
Chapter 10
10-14
In chapter 7, you determined the signal output percentages required to
drive the unselected valves during respective profiles. These values should
allow desired ram (screw) control. Although different part set-ups and
other process considerations may require that you modify them during a
particular profile, you should adjust them only if you are unable to obtain
desired closed-loop control by modifying profile tuning constants.
Important: When attempting to achieve desired closed-loop control, do
NOT change Unselected Valve Set-output Values until after you have
adjusted the profile tuning constants.
Important: Large changes to your Unselected Valve Set-output Values
may require re-spanning the selected valve for that profile. Refer to
chapter 9 for valve spanning procedures.
If you believe your Unselected Valve Set-output Values are adversely
affecting your ability to obtain quality closed-loop control, consider this:
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 setoutput
value driving the flow valve.
Pressure Profile segment pressures
substantially less than
setpoint
Increase the flow available during the profile
by appropriately modifying the setoutput
value driving the flow valve.
Velocity Profile segment velocities
substantially greater than
setpoint
Decrease the pressure available during the
profile by appropriately modifying the
setoutput value driving the pressure valve.
Velocity Profile segment velocities
substantially less than
setpoint
Increase the flow available during the profile
by appropriately modifying the setoutput
value driving the pressure valve.
RPM Backup rate substantially
faster than desired
Increase profile backpressure by modifying the
setoutput value driving the backpressure
valve.
RPM Backup rate substantially
slower than desired
Decrease profile backpressure by modifying
the setoutput value driving the backpressure
valve.