Graco PrecisionMix ii, Instructions And Parts List

Page: 175 / 260

10-11
Troubleshooting
Alarm Troubleshooting
Purge/Load Interlock Not Ready
Alarm output will be on Output #6 of Module #2.
This alarm occurs when a purge, color change, or
mixed load sequence is attempted without satisfying
the purge/load interlocks. The purge/load interlocks are
digital inputs to the Controller that indicate it is safe to
perform a purge or color change. The interlocks typi-
cally are signals from the Gun Flush Boxes, but they
can also be customized for a particular application.
The number of interlocks depends on the number of
guns set up in the system configuration.
NOTE: A PURGE sequence is set from the
Operator Switch. See page 4–4. A MIXED LOAD
sequence is set by entering a value for the mixed load
volume for Gun #1 and/or Gun #2 and by setting the
operator switch to MIX . Refer to System Config-
uration , beginning on page 8–8 for more information
on the settings.
Invalid Recipe
Alarm output will be on Output #6 of Module #2.
This alarm occurs when the user tries to access a
recipe that has not been configured or has not been
configured properly. In order for a recipe to be config-
ured properly, K-factors must be set for both flow
meters and a valid recipe must be input from the
recipe setup screens.
Common Causes of an Invalid Recipe Alarm
The recipe number is greater than the number of
recipes configured to run on the system.
Recipe 0 was selected for mixing.
The flow meter K-factors are set to zero.
Values for the desired ratio, K-factors, and pot life
timers have not been input for the recipe.
I/O Change
Alarm output will be on Output #6 of Module #2.
When this alarm occurs, the recipe number has been
changed while the Operator Switch is in the MIX
position and Integrated Color Change On is not
selected. The alarm will also occur if the system is
turned on with the Operator Switch in the MIX
position.
Purge Not Completed
This alarm only occurs when a solvent meter is pres-
ent and configured in the system. The alarm works
along with a purge by time (color change purge) to
indicate that the preset minimum purge volume has not
been reached during the purge time. Refer to page
8–9. The alarm will not clear until the purge volume is
reached or the system is powered down and back up.
Purge Time Out
This alarm only occurs when a solvent meter is pres-
ent and configured in the system. The alarm works
along with a purge by volume to indicate that the set
volume of solvent has not flowed through the solvent
valve by the time the maximum purge time has elap-
sed. Refer to page 8–9. This alarm could indicate a
meter or solvent supply problem. The alarm will not
clear until the purge volume is reached or the system
is powered down and back up.