Graco HFR Setup page 50

Troubleshooting
PROBLEM
Material does not maintain
temperature while spraying
Material temperature
exceeds setpoint
Erratic material temperature
Material does not heat
Proportioning System
Proportioning pump does not
hold pressure when stalled
Material imbalance.
Erratic pump movement
Pump output low
50
CAUSE
Ambient temperature is too cold
Flow too high
Faulty RTD connections
Faulty RTD connection
FTS not installed correctly
FTS failed or is not contacting cor-
rectly
FTS not installed correctly
Temperature control alarm
Pump piston or intake valve leaking
Inadequate flow from pump; cavita-
tion
Pressure relief/circulation valve leak-
ing back to supply
Pump cavitation
Obstructed fluid hose or gun; fluid
hose ID too small
Worn piston valve or intake valve in
displacement pump
Inadequate feed pump pressure
SOLUTION
Increase A (Red) and B (Blue) setpoints to increase
fluid temperature and keep it steady
Use smaller mix chamber. Decrease pressure.
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.
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 should be installed close to end of hose in same
environment as gun. Verify FTS installation.
Check FTS
FTS should be installed close to end of hose in same
environment as gun. Verify FTS installation.
See Advanced Display Module (ADM) on page 20
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.
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
Remove return line and determine if flow is present
while in SPRAY mode
Feed pump pressure is too low. Adjust pressure to
maintain 100 psi (0.7 MPa, 7 bar) minimum.
Open, clear; use hose with larger ID
See pump manual 3A0019
Check feed pump pressure and adjust to 100 psi (0.7
MPa, 7 bar) minimum.
3A2797ZAA