Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 195)

Tune Your Machine
Chapter 10
10-22
Ideally, this position should be calculated by determining:
With the clamp opening at its maximum configurable velocity and
pressure, what minimal distance is required for the QDC module to
safely assume control prior to the mold reaching the full open position
By setting this clamp position as stated, you can virtually eliminate the
possibility of damaging your clamp mechanism when clamp open
velocity, pressure, or position setpoints are changed
This parameter should be re-adjusted each time a different mold is
installed.
Ejector Position for Clamp Close Enable (EPC63)
This position is used by the QDC module as protection against initiating
(or continuing) any Clamp Close Profile when the ejector is not “safely”
retracted. The QDC module requires this parameter to help insure that
operator error or ladder logic mistakes cannot initiate a close operation
when the ejector is advanced. It also helps protect against the fact that
bi-directional proportional flow valves which cannot be “centered”, as well
as delays in the shifting of directional solenoid valves, sometimes allow the
ejector to slightly “float” out after they have been fully retracted.
In chapter 8, you determined the maximum “safe” ejector position for
Clamp Close Enable by jogging the ejectors against a fully closed mold.
Important: If ejector tooling or the mold is changed on your machine, the
procedure in chapter 8 should be repeated and this value recalculated to
assure ejector tooling is not damaged on mold closure.
Clamp Position for Ejector Inhibit (EPC62)
This clamp position is used by the QDC module as protection against
initiating (or continuing) any Ejector Profile when the clamp “daylight” is
not adequate for full ejector action. Nominally, this clamp position should
be equal to:
The Mold Safe Position (CPC62)
plus
The ejector full stroke length (EPC59 minus EPC60)
Important: Tooling and set-up modifications which cause either of these
two distances to change require recalculation of this clamp position.