Introduction. Graco 3A4798F, Pro Xp Waterborne Auto Air Spray Gun

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Introduction. Graco 3A4798F, Pro Xp Waterborne Auto Air Spray Gun | Manualzz

Introduction

Introduction

How the Electrostatic Air Spray

Gun Works

The air hose supplies air to the spray gun. Part of the air operates the turbine and the rest of the air atomizes the fluid being sprayed.

The turbine generates power, which is converted by the power cartridge to supply high voltage current to the gun’s external charging probe.

The pump supplies fluid to the hose and gun, where the fluid is atomized by the air cap and the atomized parti cles are electrostatically charged as they pass the external charging probe. The charged fluid is attracted to the grounded workpiece. The external charging allows the fluid supply to remain grounded at all times and therefore eliminates the need for an isolation sys tem.

Operating the Spray Function

Applying a minimum of 60 psi (0.42 MPa, 4.2 bar) air pressure to the gun manifold’s cylinder air fitting (CYL) will retract the gun piston, which opens the air valves and a short time later opens the fluid needle. This pro vides the proper air lead and lag when triggering the gun. A spring returns the piston when the cylinder air is shut off.

Operating the Electrostatics

To operate the electrostatics, apply air pressure to the gun manifold’s turbine air fitting (TA) through a Graco

Grounded Turbine Air Hose. The air enters the manifold and is directed to the inlet of the power supply turbine.

The air spins the turbine, which then provides electrical power to the internal high voltage power supply. The atomized fluid is charged by the external charging probe. The charged fluid is attracted to the nearest grounded object.

Gun Features and Options

• The gun's full voltage setting is 60kV.

• The gun is designed for use with a reciprocator, and can be mounted directly on a 1/2 in. (13 mm) rod. With additional brackets, the gun can be mounted for robotic applications.

• The gun’s quick-disconnect design enables its removal without disconnecting the fluid and air lines to the gun.

Smart Gun Features

Smart gun models with the Pro Xp Auto Control Module have the ability to:

• Display the spraying voltage and current

• Change the gun voltage setting

• Display the gun turbine speed

• Store spray profiles

• Communicate equipment faults to a PLC

• Display and set maintenance totalizers

• Use a PLC to select a spray profile

See the Pro Xp Auto Control Module manual 332989 for more information.

3A4798F 7

Introduction

System Overview

Typical System Installation

F IGURE 1 shows a typical electrostatic air spray system. It is not an actual system design. For assistance in design

ing a system to suit your particular needs, contact your Graco distributor.

Non-Hazardous Location Hazardous Location

F IG . 1. Typical System Installation

C

D

A

B

E

Gun

Graco Grounded Turbine Air Hose

Atomizer, Fan, and Cylinder Air

Air Supply and controls

Grounded Fluid Supply and controls

8

J

K

L

G

H

Smart System Components

F Programmable Logic Controller (PLC)

Pro Xp Auto Control Module

Power Supply (24 Volt)

Bulkhead (optional)

Fiber Optic F/O Cable

I/O Cable

3A4798F

Gun Overview

M

Introduction

F

K

2

TA

1

A2

EXH

P

A1

CYL

J

A C

H

D

B

F

IG

. 2. Gun Overview

Key

H

J

F

G

M

C

D

A

B

Air Cap

Fluid Nozzle

Retaining Ring

Shroud

Manifold/Mounting Bracket

Turbine

Power Supply

Electrode

External Charging Probe

3A4798F

G

Manifold Fittings and Indicators

A1 Atomization Air Inlet Fitting

A2 Fan Air Inlet Fitting

CYL Cylinder Air Inlet Fitting

1

2

Fiber Optic Fitting Transmit

(Operational on Smart models only)

Fiber Optic Fitting Receive

(Operational on Smart models only)

K

P

ES Indicator Light (Standard models only)

Fluid Supply Inlet Fitting

TA Turbine Air Inlet Fitting (to drive turbine)

EXH Exhaust Outlet Fitting

9

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