Operation. Graco 313227A PRO Xs Auto Waterborne Electrostatic Air Spray Gun

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Operation. Graco 313227A PRO Xs Auto Waterborne Electrostatic Air Spray Gun | Manualzz



Pressure Relief Procedure

The system pressure must be manually relieved to prevent the system from starting or spraying accidentally. To reduce the risk of an injury from electric shock, accidental spray from the gun, splashing fluid, or moving parts, follow the Pressure Relief

Procedure whenever you:

are instructed to relieve the pressure

stop spraying

check or service any of the system equipment

or install or clean the fluid nozzle.


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.


Turn off the fluid supply to the gun.


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


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


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


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.

Operating Checklist

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 15.

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 12.

The condition of the gun’s electrical compo-

nents has been checked as instructed in Elec-

trical Tests on page 22.

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 21.

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Select a Fluid Nozzle and Air


The gun is supplied with Part No. 197266 Nozzle and

24A276 Air Cap. If you require a different size, refer to

Table 2 and instruction manual 309419, or consult with

your Graco distributor. See Replace Air Cap/Nozzle on page 30.

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 procedure on page 15 before

removing or installing a fluid nozzle and/or air cap.


Relieve pressure, page 15.


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



. 12. 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: Due to the larger needle diameter, use a nozzle one size larger than you would use with a standard PRO

Xs gun (i.e., 1.5 mm = 1.2 mm flow area).

Table 2: Fluid Nozzles

Part No.







Orifice Size

1.2 mm (.047 in.)

1.5 mm (.055 in.)

1.8 mm (.070 in.)

1.2 mm (.047 in.)

1.5 mm (.055 in.)

1.8 mm (.070 in.)

* Glass-reinforced acetal construction.

Vertical Pattern

Horizontal Pattern

F IG . 12. Air Cap Positions


Adjust the fluid flow with the fluid pressure regulator.

Refer to instruction manual 309419 to set the fluid pressure for various fluid flows, according to the size of the fluid nozzle being used.


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

See F IG . 13. 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.

16 313227A



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

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

• 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 25 to

correct spray pattern problems.

Adjust the Electrostatics


Shut off the fluid supply.


Trigger the gun, then turn on the turbine air (TA).

See F IG . 13.


Refer to Table 3 to set the proper pressure at the turbine air hose inlet when air is flowing.


Do not exceed these pressures as there is no added benefit and turbine life could be reduced.







F IG . 13. Manifold Air Connections


Table 3: Dynamic Turbine Air Pressures

Turbine Air

Hose Length ft (m)

15 (4.6)

25 (7.6)

36 (11)

50 (15.3)

75 (22.9)

100 (30.5)

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

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)


Check the voltage output of the gun using a high voltage probe and meter or by reading the ES (kV)

Display Module.

The gun’s normal spraying voltage reading is 30-40 kV. If a ball end high voltage measurement probe is used, the gun voltage will rise to about 60 kV. This will happen with all resistive electrostatic guns.

See Electrical Troubleshooting on page 27 to cor-

rect voltage problems.

313227A 17



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.


Apply a minimum of 50 psi (3.5 bar, 0.35 MPa) air pressure to the cylinder air fitting (CYL) to activate the on/off sequence of atomization air (A1), fan air

(A2), and fluid (P1). See F IG . 13.


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

(TA) air supply lines.


To change to a lower voltage setting, activate the solenoids controlling the KV1 and KV2 ports. See

Changing the kV Setting on page 5.

Triggering the Fluid Alone


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


Apply 50 psi (3.5 bar, 0.35 MPa) air pressure to the cylinder air fitting (CYL) to trigger the fluid.



Relieve pressure, page 15.


Flush and clean the equipment. See Maintenance on page 19.

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 21.

18 313227A


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