Graco 24N572, Setup

Page: 50 / 120

Troubleshooting
50 3A2797ZAA
Material does not maintain
temperature while spraying
Ambient temperature is too cold Increase A (Red) and B (Blue) setpoints to increase
fluid temperature and keep it steady
Flow too high Use smaller mix chamber. Decrease pressure.
Material temperature
exceeds setpoint
Faulty RTD connections Verify that all FTS connections are snug and that pins
of connectors are snug and that pins of connects are
clean. Examine connection of thermocouples to long
green plug on heater control board. Unplug and
re-plug RTD wires, cleaning off any debris. Unplug
and re-plug long green connector on heater control
board.
Erratic material temperature Faulty RTD connection Verify that all FTS connections are snug and that pins
of connectors are clean. Examine connection of RTD
to long green plug on heater control board. Unplug
and re-plug RTD wires, cleaning off any debris.
Unplug and re-plug long green connector.
FTS not installed correctly FTS should be installed close to end of hose in same
environment as gun. Verify FTS installation.
Material does not heat FTS failed or is not contacting cor -
rectly
Check FTS
FTS not installed correctly FTS should be installed close to end of hose in same
environment as gun. Verify FTS installation.
Temperature control alarm See Advanced Display Module (ADM) on page 20
Proportioning System
Proportioning pump does not
hold pressure when stalled
Pump piston or intake valve leaking 1. Observe gauges to determine which pump is
losing pressure.
2. Determine in which direction the pump has
stalled by observing which directional valve indi -
cator light is on.
3. Repair the valve.
Material imbalance. Inadequate flow from pump; cavita -
tion
Increase fluid supply to proportioning pump:
•
Use 2:1 supply pump
•
Use minimum 3/4 in. (19 mm) ID supply hose, as
short as practical
Fluid is too thick. Consult your material supplier for
the recommended fluid temperature to maintain a
viscosity of 250 to 1500 centipoise.
Clean inlet strainer screen
Worn pump inlet valve ball/seat or gasket
Pressure relief/circulation valve leak -
ing back to supply
Remove return line and determine if flow is present
while in SPRAY mode
Erratic pump movement Pump cavitation Feed pump pressure is too low. Adjust pressure to
maintain 100 psi (0.7 MPa, 7 bar) minimum.
Pump output low Obstructed fluid hose or gun; fluid
hose ID too small
Open, clear; use hose with larger ID
Worn piston valve or intake valve in
displacement pump
See pump manual 3A0019
Inadequate feed pump pressure Check feed pump pressure and adjust to 100 psi (0.7
MPa, 7 bar) minimum.
PROBLEM CAUSE SOLUTION