Graco HydroShield Instructions Manual page 77

Problem
Problem Problem
Low or no spraying voltage.
Voltage is still present at the gun
after the trigger is released.
Voltage is still present at
the gun after following the
Fluid Voltage Discharge and
Grounding Procedure, page
Paint goes backward toward the
paint supply.
3A7370C
Diagnosis
Diagnosis Diagnosis
• The ground rod (18) is not
raising.
• The isolation valve (227) is not
raising.
• The components or cabinet (9)
is dirty.
• The electrostatic shield (12) is
not in place.
Air Flow Switch does not recognize
the gun trigger and does not raise
the ground rod.
Incorrect voltage level display
Ground Rod Delay setting.
The ground rod (18) does not
lower.
Air pocket in the fluid line leaves
fluid isolated near the gun.
Issue with the door switch.
29.
Faulty inlet valve and check valve.
Troubleshooting
Solution
Solution Solution
See Voltage Loss
Troubleshooting, page
Use the Status screen to
see whether the system
detects the gun trigger. See
Status Screen 1, page
Check system voltage using a
probe (236003).
Calibrate the bleed resistor as
described in Calibrate the Bleed
Resistor, page 62.
Check or replace the kV
board as described in
Replace a kV Board, page
Adjust the Ground Rod Delay
setting on the System screen. See
System Screen, page 69.
Follow the procedure in
Check and Lubricate the Ground
Rod, page 72.
Determine cause and correct.
Purge air from the fluid line.
Check the door
switch as described in
Check the Door Switch, page
With the shuttle down, test the
Shuttle Fluid In, Pump Fluid In, and
Pump Pressure valves individually
on Maintenance Screen 4. If fluid
is in valves at the same time as
there is pump pressure, this can
result in fluid back-flowing if a
check valve is not present.
See Maintenance 4: Fluid Valve
Resets and Test, page
Check for a leaky check valve.
79.
54.
109.
73.
65.
77