Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 24)

Overview of Inject and Clamp Mode
Chapter 1
1-12
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. Up to two
low pressure close profile segments may be used (Figure 1.12).
You will use pressure vs. position for low pressure close.
Figure 1.12
Example Low Pressure Close
Clamp
Cylinder
Moving
Platen
Low Pressure Close
Position
Pressure
L 0 X
Segments
1
2
Stationary
Platen
Important: If you need only one low pressure close segment, configure
the 1st segment of the low pressure close profile.
The QDC notifies your PLC-5 program when this profile is complete and
automatically uses set-output values at the end of low pressure close to
build tonnage (hydraulic machine) or lockup your toggle (toggle machine).
Clamp Open
You can open the mold fast with three profiles of the clamp open phase:
first open
second open
third open
You may select from these control modes:
velocity vs. position
pressure vs. position
Use clamp open to move the platen from the fully closed position (0) to
some position Y at a relatively high velocity or pressure (Figure 1.13). Y
is close to your fully open position (L), yet far enough away for
deceleration into the open slow profile. This aids positioning accuracy at
the full open position (L).