Graco PSM Instructions Manual page 46

Troubleshooting
Problem
Leakage from needle
High pressure
"Home" error
46
Cause
Air in Dispense valve (AB, page 8)
Dispense Valve (AB, page 8) not
closed
Dispense Valve (AB, page 8) needle
and/or seat worn out (pressure
reduces after closing the valve)
Damaged or missing gasket (O-ring)
between seat and housing (hard
seat only)
High pressure
Dispense Valve (AB, page 8)
clogged
Material in needle cured
Dispense speed unsuitable for
needle
Pressure sensor error
Error not reset
Pressure higher than set point
"Home" button flashing and waiting 1. Verify reload pressure value is correctly
Servo motor alarm
Solution
Slow speed purging
1. Verify Dispense Valve's (AB, page 8)
inlet air pressure.
2. Clean blockage between needle and
seat.
3. Verify solenoid valve status.
Replace Dispense Valve (AB, page 8)
needle and/or seat
Replace gasket (O-ring)
See solutions for problem of high pressure
Clean Dispense Valve (AB, page 8)
Replace needle
1. Replace the current needle with a
bigger gauge.
2. Slow down dispensing speed to
decrease working pressure (continuous
and stable dispensing pressure should
be within a range of 150-400 psi).
Replace pressure sensor
Pull up E-stop button and press "reset"
Go to the Advanced Screen of control box,
select 'Dispense valve' to open Dispense
Valve (AB, page 8) to reduce pressure
set.
2. Verify air supply.
3. Inspect low level sensor status.
4. Confirmed inlet ball valve is opened (if
installed).
5. Verify cartridge or pail is not empty.
6. Verify supply pump is working.
1. Inspect ball screw and slides are
functional.
2. Verify motor and encoder cable are
connected.
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