Graco PrecisionMix ii, Instructions And Parts List

Page: 27 / 260

Overview 2–17
Using Recipes/Color Change
Integrated Color Change – continued
The devices that are controlled by the Integrated Color
Change Sequences are as follows.
Purge Valves: The Integrated Color Change
Sequence typically starts by purging out the old mixed
material. The purge can be further defined by setting
the total purge time, the purge time for the first cycle,
the purge time for the last cycle, and the individual
purge times for the three possible purge valves. The
beginning of the purge can be delayed to allow time for
the gun triggers to activate. Refer to page 8–23.
Mix Valves: The sequence fills the hoses with the new
mixed material after the system has finished purging.
The target mix parameters are calculated after the
purge is completed, before the mix begins. The user
defines the mix (fill) time duration for the Color Change
Sequence. Refer to page 8–23.
Dump Valves: The dump valves open immediately
when the Color Change Sequence begins. The user
then configures how long these valves stay open. The
purpose of these valves is to allow the unmixed A, B,
and C component materials to dump from the system
before entering the mix manifold. Refer to page 8–24
and 8–26.
Solvent Valves: The Solvent valves open immediately
when the Color Change Sequence begins. The user
then configures how long these valves stay open. The
purpose of these valves is to push the unmixed A, B,
and C component materials through the dump valves
and clean the hoses for the next material. Refer to
page 8–24 and 8–26.
Gun Triggers 1–2: The gun triggers are electrical
outputs that can be configured to turn on and off up to
two times. These outputs are typically wired to the
spray guns triggers to allow automatic purging and
filling. Refer to page 8–27.
Special Outputs 1, 2, 5, and 6: The special outputs
are optional outputs that the user can configure for
their particular application. Each of these valves can
be turned on and off up to four times during a color
change sequence. Refer to page 8–28.
Specials 1 and 2 are pneumatic outputs, while Spe-
cials 5 and 6 are electrical outputs.
Integrated Color Change with Queue
The Integrated Color Change with Queue mode of
operation runs in a similar fashion to the standard
Integrated Color Change mode. The difference
between the two modes is that the Queue parameters
override the normal color change parameters during
the color change. Five data sets can be set up in a
queue and sent to the controller individually. Refer to
page 6–7. A queue data set consists of the following
five parameters.
1. Sequence Number – The number for the color
change sequence that will be used for the new
color.
2. Recipe Number – The recipe number that will be
used for the new color.
3. Color Valve Component A (Resin) – The number
corresponding to the component A color valve
chosen for the new color.
4. Color Valve Component B (Catalyst) – The
number corresponding to the component B color
valve chosen for the new color.
5. Color Valve Component C (Reducer) – The
number corresponding to the component C color
valve chosen for the new color.
A Queue Color Change is triggered by pressing the
Enter key on the Operator Station or by setting the
Color Change Bit on the I/O of the controller. The data
set values on the top of the queue will be used for the
Color Change. When color change is complete, the
top level of the queue is erased and all of the other
data sets move up one level on the queue.