Graco 3A2497BPro User Manual download pdf (Page 41)

Troubleshootin

Visual Checks

First, check the system for any visible faults or errors

to help isolate whether the spray gun, ﬂuid hose or

voltage isolation system has failed. A voltage probe

and meter, part no. 245277, is helpful for diagnosing

voltage problems and is required for some of the

troubleshooting tests that follow.

1. Check that al

l of the air and ﬂuid tubes and hoses

are properly

connected.

2. Check that t

he voltage isolation system valves

and control

s are properly set for operation.

3. Check that t

he interior of the isolated enclosure

is clean.

4. Check that

the spray gun and voltage isolation

system hav

e sufﬁcient air pressure.

5. Check that

the gun ES ON/OFF valve is in the

ON positi

on and that the gun ES indicator light

is on. If t

he ES indicator light is not on, remove

the spray

gunforserviceandcompletethe

Electric

al Tests, page 36.

6. Check th

at the voltage isolation system's

enclosu

re door is closed and that any safety

interlo

cks are engaged and working properly.

7. Make sure the voltage isolation system is in

the “isolate” mode, where it is isolating the ﬂuid

voltage from ground.

8. To eliminate air gaps in the ﬂuid column, spray

enough ﬂuid to purge the air out between the

voltage isolation system and the spray gun. An

air gap in the ﬂuid hose can break the electrical

continuity between the spray gun and the isolated

ﬂuid supply and cause a low voltage reading on

a voltage meter connected to the isolated ﬂuid

supply.

9. Check the spray gun cover and barrel for

accumulated overspray. Excessive overspray

can create a conductive path back to the

grounded gun handle. Install a new gun cover

and clean the exterior of the gun.

10. Inspect the entire system for any visible ﬂuid

leakage and repair any ﬂuid leaks that are found.

Pay special attention to the following areas:

•Packinga

rea of the spray gun.

• Fluid hos

e: check for leakage or any bulges in

the outer

cover, which may indicate an internal

leak.

• Interna

l voltage isolation system components

3A2497B

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Graco 3A2497BPro User Manual Page 41

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