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System Verification
40 312359J
System Verification
Graco recommends running the following tests daily.
Mix and Integration Tests
Use the following tests to check for proper mix and inte-
gration.
Butterfly Test
At low pressure, normal flow rate, and without a spray tip
installed, dispense a 1/2 in. (12.7 mm) bead of material
onto foil until multiple changeovers of each pump have
occurred. Fold the sheet of foil over the fluid then peel it
back and look for unmixed material (appears mar-
ble-like).
Curing Test
Spray a single continuous pattern on foil at typical pres-
sure setting, flow rate, and tip size until multiple change-
overs of each pump have occurred. Trigger and
de-trigger at typical intervals for the application. Do not
overlap or cross over your spray pattern.
Check curing at various time intervals, listed on the
material data sheet. For example, check for dry to touch
by running your finger along the test pattern’s entire
length at the time listed on the data sheet.
NOTE:
Spots that take longer to cure indicate insufficient inte-
gration.
Appearance Test
Spray material onto metal substrate. Look for variations
in color, gloss, or texture that may indicate improperly
catalyzed material.
Pump and Metering Test
This test checks the following four items and should be
run every time a new job is started, or if there is a sus-
pected problem.
• Verifies that the pumps installed match the pumps
selected on the Setup screen by dispensing exactly
750 ml of each material.
• Verifies that each pump holds fluid against the pump
inlet valve by stalling on the down stroke.
• Verifies that each pump holds fluid against the pump
piston valve and packings by stalling on the
upstroke.
• Verifies that each metering valve holds fluid, and
that there are no external leaks between the pump
and metering valve.
• Verifies that the recirculation valves (AC, AD) are
closed and do not leak.
This test will dispense 750 ml of component A, and then
750 ml of component B. Dispense into separate cups so
the fluid can be returned to the supply tanks.
NOTE:
During each dispense the flow will stop once to stall the
upstroke, once to stall the downstroke, and then it will
finish the dispense. Do not close the sampling valve until
the third flow stops and the blue pump light (DK) goes
out.
1. Enter Test mode in the run (fluid control) screen.
See Test Screens on page 71. Select
to
run pump test.