Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 18)

Overview of Inject and Clamp Mode
Chapter 1
1-6
InjectionĆtoĆpack Transition
The QDC module ends the injection phase and automatically starts the
pack or hold phase when it detects the first of up to three events occurred:
Ram (screw) position exceeds a preset limit
Ram (screw) pressure exceeds a preset limit
Injection phase elapsed time exceeds a preset limit
You select which of these events you want monitored for transition by
entering the appropriate setpoint, or zero for ignoring the event. You also
may specify the zone of ram (screw) travel over which the QDC module
inhibits or allows a pressure transition.
Pack Phase
The QDC module controls the pack phase with a pressure vs. time profile.
You create the profile based on controlling the hydraulic pressure against
the ram (screw). The pressure can be controlled using up to five segments.
By convention, events occur from right to left on the time axis
(Figure 1.5). You determine the pressure setpoints and time durations for
the pack profile based on molding requirements. The pack phase is
optional.
Figure 1.5
Pack Phase Example
Pressure
Time
1 2 3 4 5