Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 22)

Overview of Inject, Clamp, and Eject Mode
Chapter 1
1-10
You may start these operations between the three clamp close profiles:
pick up the 3rd plate of a mold (on a floating 3-plate mold) or set cores
program other events for all valves
automatically bridge between profiles, or let ladder logic decide when to
begin the next profile
You can subdivide each clamp close profile into three position segments
(Figure 1.11). You can change clamp velocity or pressure up to three times
in each profile, or up to nine times for the entire clamp close phase.
Figure 1.11
Example Clamp Close Position Segments
Position
Velocity
1st Close
Profile
2nd Close
Profile 3rd Close
Profile
1
1
1
2
2
2 3
3
3
Segments
L
0
Stationary
Platen
Clamp
Cylinder
Moving
Platen
X
Important: You may use as many or as few profiles and/or segments
within profiles as needed for your molding application. If using a single
close fast motion, use the first segment of the 1st close profile. The low
pressure close profile must follow.
After completing the last segment in each profile, the QDC module either
switches immediately to the next programmed segment of the next
programmed profile or waits for a command from your PLC-5 program to
continue.
After completing the last configured close profile, the QDC module either
switches immediately to the first programmed segment of low pressure
close, or waits for a command from your PLC-5 program to continue.
Low Pressure Close
Use the low pressure close profile to decelerate closing motion to guard
against damaging the mold halves and detect for part obstructions. The
pressure setpoint(s) that you select to control low pressure close should
prohibit the mold from fully closing if there is an obstruction. You may
use one or two low pressure close profile segments (Figure 1.12).
You must use pressure vs. position for low pressure close.