Graco 24T918 Instruction Manual page 47

Problem Cause
Level Sensor Failure of the level sen-
Error sor (20) or sensor
cable 16T108 (J14 to
level sensor (20)).
The InvisiPac Some adhesives are
system expels very dusty due to the
adhesive pel- anti-blocking agents
lets dust when used or because the
refilling. adhesive manufactur-
ing process has cre-
ated small adhesive
shavings. Feed inlet
cap filter may have
become clogged.
The InvisiPac Fluid leak.
system will not
stall, pump
continues to
move even if
the applicators
are all closed.
The system System is not up to
will not dis- temperature.
pense mate-
Incorrect temperature
rial.
set points entered into
ADM.
Air motor is not receiv-
ing compressed air or
air pressure too low.
Feed pump not feed-
ing adhesive.
Timing control for appli-
cators not working.
Cycle Switch Cycle switch or cycle
Error switch wiring failure.
Loose or missing fas-
tener (26).
333347F
Solution
Check sensor cable J14 to level sensor (20).
Enable Diagnostic screen on ADM then check sensor readings on the
Diagnostic screen. Sensor readings should be about 4.3V if melter is
completely empty (melter passage holes are visible). The normal oper-
ating range is 3.8 to 4.3V. If the sensor is reading more than 4.2V the
system should be requesting additional material.
Restart system. If the error persists after attempting another refill and
unit is needed immediately for production, place system into the man-
ual refill mode. See Manual Refill on page 30.
Replace Funnel Filter, see page 38.
NOTE: Feed cap filter maintenance should be performed at regular
service intervals. It is recommended that the feed cap filter be
inspected at a minimum of every 1200 lb dispensed, however with
some adhesives the frequency may need to be increased significantly
to maintain desired system cleanliness.
Verify that no external leakage is present.
Inspect and test the pressure relief valve.
Perform Flush Pressure Relief Valve, page 54.
If system is still unable to stall, the pump or pressure relief valve may
need to be repaired.
Verify that the system is active.
Verify the temperature settings are correct.
Verify that the pump air pressure is set above 20 psi. Check the Pump
Air Solenoid Operation, page 54.
Repair or replace air control assembly as necessary.
Repair or replace pump assembly as necessary.
InvisiPac system does not control the timing of the applicators. This is
a separate control that needs to be adjusted. Consult control manufac-
turer or qualified electrician.
Check the wiring between the air motor cycle switch and J16.
Repair/replace as required.
Ensure fastener (26) is tight. See InvisiPac Systems section begin-
ning on page 83 for part identification.
Troubleshooting
47