Operation. Graco 3A4798C, Pro Xp Waterborne Auto Air Spray Gun

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Operation. Graco 3A4798C, Pro Xp Waterborne Auto Air Spray Gun | Manualzz

Operation

Operation

Pressure Relief Procedure

This equipment stays pressurized until pressure is manually relieved. To help prevent serious injury from pressurized fluid, such as splashing, follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or servicing the equipment.

1.

Turn off all the air to the spray gun except the cylinder air, which triggers the gun. If an air pilot fluid regulator is used in the system, the air pressure is needed at the regulator air inlet.

2.

Turn off the fluid supply to the gun.

3.

Trigger the gun into a grounded metal waste container to relieve the fluid pressure.

4.

If an air pilot fluid regulator is used, turn off the air pressure at the regulator air inlet.

5.

Relieve fluid pressure in the fluid supply equipment as instructed in its instruction manual.

6.

Turn off the main air supply by closing the bleed-type master air valve on the main air supply line. Leave the valve closed until you are ready to spray again.

Startup

Check the following list daily, before starting to operate the system, to help ensure you of safe, efficient operation.

All operators are properly trained to safely operate an automatic electrostatic air spray system as instructed in this manual.

All operators are trained in the Pressure

Relief Procedure on page 18.

The warning sign provided with the gun is mounted in the spray area where it can be easily seen and read by all operators.

The system is thoroughly grounded and the operator and all persons entering the spray

area are properly grounded. See Grounding on page 15.

The condition of the gun’s electrical components has been checked as instructed in

Electrical Tests on page 24.

Ventilation fans are operating properly.

Workpiece hangers are clean and grounded.

All debris (including flammable fluids and rags) is removed from the spray area.

All flammable fluids in the spray booth are in approved, grounded containers.

All conductive objects in the spray area are electrically grounded and the floor of the spray area is electrically conductive and grounded.

The manifold exhaust tubes have been checked for the presence of any fluid as

instructed in Check for Fluid Leakage on page 23.

18 3A4798C

Operation

Adjust the Spray Pattern

Follow the steps below to establish the correct fluid flow and air flow. Do not turn on the turbine air (TA) yet.

To reduce the risk of an injury, follow the Pressure

Relief Procedure

whenever you are instructed to relieve the pressure.

1.

Relieve the pressure. Follow the

Pressure Relief

Procedure , page 18.

2.

Select and install the appropriate air cap and nozzle

for your application. See

Air Cap and Nozzle

Replacement , page 31.

3.

Loosen the air cap retaining ring, and rotate the air cap for a vertical or horizontal spray pattern. See

F IGURE 10. Tighten the retaining ring until the air cap

is held firmly in place; you should not be able to rotate the air cap horns by hand.

NOTE: Use the short charging probe when spraying horizontal patterns.

6.

Use the air pressure regulator on the fan air supply line (A2) to adjust the pattern size.

NOTES:

• When increasing to a wide, flat pattern, it may be necessary to increase the supply of fluid to the gun to maintain the same amount of coverage over a large area.

See Spray Pattern Troubleshooting on page 27 to

correct spray pattern problems.

Vertical Pattern

Horizontal Pattern

F IG . 10. Air Cap Positions

4.

Adjust the fluid flow with the fluid pressure regulator.

Refer to the Performance Charts on pages 52 to set

the fluid pressure for various fluid flows, according to the size of the fluid nozzle being used.

5.

Use the air pressure regulator on the atomization air supply line (A1) to adjust the degree of atomization.

For example, for a fluid flow rate of 10 ounces per minute (0.3 liters per minute), a typical atomization pressure would be 20-30 psi (1.4-2.1 bar, 0.14-0.21

MPa) at the gun manifold.

For the most efficiency, always use the lowest air pressure possible.

3A4798C 19

Operation

Adjust the Electrostatics

1.

Turn on the turbine air (TA) and adjust the air pres-

sure per the settings in Table 1 . Set the proper

pressure at the turbine air hose inlet when air is flowing .

Table 1. Approximate Dynamic Turbine Air

Pressures

Turbine Air

Hose Length ft

(m)

Air pressure at turbine air hose inlet for full voltage psi (bar, MPa)

15 (4.6)

25 (7.6)

36 (11)

50 (15.3)

75 (22.9)

100 (30.5)

54 (3.8, 0.38)

55 (3.85, 0.38)

56 (3.9, 0.39)

57 (4.0, 0.40)

59 (4.1, 0.41)

61 (4.3, 0.43)

2.

Check the turbine speed of the gun by checking the indicator light on the standard gun body or for the smart gun check the actual turbine speed on the Pro

Xp Auto Control Module. See the following table.

Adjust the air pressure as necessary to keep the indicator light green or the values within 400-750

Hz.

Smart models display values, standard models display color indicator lights.

Indicator

Color

Table 2. Indicator Colors

Description

Green

400-750 Hz

Amber

<400

When spraying, the indicator should remain green, indicating sufficient air pressure to the turbine.

If the indicator changes to amber after 1 second, the air pressure is too low.

Increase air pressure until the indicator is green.

Red

>750

If the indicator changes to red after 1 second, the air pressure is too high.

Decrease air pressure until the indicator is green. Excessive turbine speed can shorten the bearing life and will not increase the voltage output.

Spraying

To reduce the risk of electric shock, do not touch the gun electrode or come within 4 in. (10 cm) of the nozzle during gun operation.

1.

Apply a minimum of 60 psi (4.2 bar, 0.42 MPa) air pressure to the cylinder air fitting (CYL) to activate the on/off sequence of atomization air (A1), fan air

(A2), and fluid (P).

2.

Turn the gun functions on and off by using the air solenoid valves on the cylinder (CYL) and turbine

(TA) air supply lines.

3.

To change a smart model to a lower voltage setting, see the Pro Xp Auto Control Module 332989.

If any fluid leakage from the gun is detected, stop spraying immediately. Fluid leakage into the gun shroud could cause fire or explosion and result in serious injury and property damage. See

Check for Fluid

Leakage on page 23.

20 3A4798C

Operation

Triggering the Fluid Alone

1.

Shut off and relieve the air pressure to the atomization (A1) and fan (A2) air lines, using the bleed-type air shutoff valves.

2.

Apply 60 psi (4.2 bar, 0.42 MPa) air pressure to the cylinder air fitting (CYL) to trigger the fluid.

Shutdown

To reduce the risk of an injury, follow the

Pressure

Relief Procedure

whenever you are instructed to relieve the pressure.

1.

Flush the gun, see Flushing , page 22.

2.

Follow the Pressure Relief Procedure , page 18.

3.

Clean the equipment. See Maintenance

on page

22.

3A4798C 21

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