User's Manual

Troubleshooting
54 3A2776D
Troubleshooting
Alarms
See Appendix B - Alarms, starting on page 76.
General Tips
The following information will help ensure the system is set up properly.
Grounding
• Ensure incoming power is grounded.
Air Supply
• Use at least a 3/4 in. (19mm) ID air hose, no longer
than 50 feet (15m).
• Ensure the first air pressure supply gauge stays above
80 psi (0.55 MPa, 5.5bar) while spraying.
• Ensure that the metering pump air pressure regulator
is set to at least 35 psi (2.4 bar) for spraying.
• Ensure that the solenoid air filter/regulator behind the
air panel is set to at least 80-85 psi.
• Check that the air filter element in the solenoid air fil-
ter/regulator behind the air panel is clean.
• Check that the main inlet air filter is clean.
Calibration
• Ensure dosing valve needle packing nuts are not
adjusted too tight. They should be snug when there is
no fluid pressure on the valve.
Motor Icing
Air motors accumulate ice in the exhaust valving and muf-
fler under hot and humid conditions or under cold ambient
conditions. It can cause pressure loss or motor stalling.
• The ‘B’ fluid pressure should always be 15% to 30%
higher than ‘A’ pressure.
• A larger pressure difference indicates ‘A’ motor icing.
• A smaller or negative pressure difference indicates ‘B’
motor icing.
• Ensure that the NXT motor de-Ice bleed valves are
open to bleed warm air across the ice.
• Ensure that the motor is left active when not spraying
to keep the internal bleed air working. Leave the motor
active in Spray mode or Manual mode to keep the
bleed air on.
Restrictions or Lost Pressure
• Check that the static mixer and whip hose are clean.
• Check the check valves for build up if spraying
fiber-filled material.
Mix Manifold
• Ensure that the ‘A’ and ‘B’ outlet hose sizes volume
balanced close to the mix ratio. Unbalanced hose sizes
can cause off-ratio slugs at the mix manifold during
pressure and/or flow transitions. See XM PFP Mix
Manifold manual.
• If less integration and mix hose is used than what is
recommended, ensure that “Fast Dosing” is selected in
the setup screens.
Software Version
• Ensure all modules in the system use software from
same token. Different software versions may not be
compatible.
• The latest software version for each system can be
found at Tech Support at www.graco.com.