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

Add to My manuals
48 Pages

advertisement

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

Installation

Installation

Install the System Ventilate the Spray Booth

Installing and servicing this equipment requires access to parts which may cause electric shock or other serious injury if work is not performed properly.

Do not install or service this equipment unless you are trained and qualified.

Be sure your installation complies with National,

State and Local codes for the installation of electrical apparatus in a Class I, Div. I, Group D or a

Group II, Category 2G Hazardous Location.

Comply with all applicable local, state, and national fire, electrical, and other safety regulations.

F IG . 2 shows a typical electrostatic air spray system, and

F IG . 3 shows possible system options. It is not an actual

system design. For assistance in designing a system to suit your particular needs, contact your Graco distributor.

Warning Signs

Mount warning signs in the spray area where they can easily be seen and read by all operators. An English

Warning Sign is provided with the gun.

Provide fresh air ventilation to avoid the buildup of flammable or toxic vapors when spraying, flushing, or cleaning the gun. Do not operate the gun unless ventilation fans are operating.

Electrically interlock the gun air supply with the ventilators to prevent gun operation without ventilating fans operating. Check and follow all National, State, and

Local codes regarding air exhaust velocity requirements.

High velocity air exhaust will decrease the operating efficiency of the electrostatic system. Air exhaust velocity of

100 ft/min (31 linear meters/minute) should be sufficient.

Key to F IG . 2 and F IG . 3

Q

R

N

P

J

K

L

M

U

V

S

T

W

G

H

E

F

C

D

A

B

X

Y

Air Hose Ground Wire

Graco Grounded Turbine Air Hose (TA)

Atomizing Air Hose, 3/8 in. (10 mm) OD (A1)

Fan Air Hose, 3/8 in. (10 mm) OD (A2)

Cylinder Air Hose, 5/32 in. (4 mm) OD (CYL)

Fluid Hose, 1/4-18 npsm gun fluid inlet (P1)

To Fluid Supply

Auto PRO Xs Air Spray Gun

Mounting Bracket for 1/2 in. (13 mm) rod

Solenoid Valve, requires quick exhaust port

Bleed-Type Master Air Valve

Air Pressure Regulator

True Earth Ground

24 Volt Power Supply

4-20 microampere Outputs

Full Feature ES Display Module kV Only ES Display Module (battery operated)

Fiber Optic Y Cable

Bulkhead

Fiber Optic Cable

Main Air Line kV Switch Air Hose, 5/32 in. (4 mm) OD (optional; plug KV1 fitting if not used) kV Switch Air Hose, 5/32 in. (4 mm) OD (optional; plug KV2 fitting if not used)

313227A 7

Installation

L W

See * above

L

L

K

K

K

NOTE:

* The turbine air supply (TA) must be electrically interlocked with the spray booth ventilation fans to prevent the power supply from operating without ventilating fans on.

A

X Y B C D

TA

KV1

KV2

A1 A2

CYL

K P1

N

F

M

Non-Hazardous Area

E

G

Hazardous Area

J

TI1712A

Manifold Back View

F IG . 2. Typical Installation

NOTE:

** A maximum of two splices with a total of 108 ft (33 m) of cable can be used. For the stron-

gest light signals, use a minimum number of bulkhead splices. See Accessories on page 45.

Non-Hazardous Area Hazardous Area

P

R T U**

KV

μA

V**

Q

85.0 KV

S

F IG . 3. Optional Fiber Optic Connection to Voltage Display Module

8

H

TI13427a

313227A

Installation

Connect the Charging Probe

1.

Apply dielectric grease to the charging probe

socket. See F IG . 4.

Probe

Socket

Install the Air Line Accessories

1.

Install a bleed-type air valve (L) on the main air line

(W) to shut off all air to the gun (H).

2.

Install an air line filter/water separator on the gun air line to ensure a dry, clean air supply to the gun. Dirt and moisture can ruin the appearance of your finished workpiece and can cause the gun to malfunction.

3.

Install a bleed-type air regulator (M) on each of the air supply lines (B, C, D, E, X, Y) to control air pressure to the gun.

4.

Install a solenoid valve (K) on the cylinder air line (E) to actuate the gun. The solenoid valve must have a quick exhaust port.

ti13446a

F IG . 4. Probe Socket

2.

Install the charging probe in the Connect/Discon-

nect position shown in F IG . 5.

Connect/Disconnect

Position

Trapped air can cause the gun to spray unexpectedly, which can result in serious injury, including splashing fluid in the eyes or on the skin. The solenoid valves (K) must have a quick exhaust port so trapped air will be relieved between the valve and gun when the solenoids are shut off.

Spray

Position ti13447a

Install the Fluid Line

Accessories

1.

Install a fluid filter and drain valve at the pump outlet.

F

IG

. 5. Charging Probe Positions

3.

Rotate the charging probe to spray position.

NOTICE

The external charging probe rotates easily. Do not press too hard when rotating it or it could be damaged.

NOTE: For proper performance, do not operate electrostatics if the charging probe is not in spray position.

The fluid drain valve is required in your system to assist in relieving fluid pressure in the displacement pump, hose, and gun. Triggering the gun to relieve pressure may not be sufficient. Install a drain valve close to the pump's fluid outlet. The drain valve reduces the risk of serious injury, including splashing in the eyes or on the skin.

2.

Install a fluid regulator on the fluid line to control fluid pressure to the gun.

313227A 9

Installation

Install the Gun and Mounting

Bracket

1.

Loosen the mounting bracket’s two set screws (103) and slide the bracket (102) onto a 1/2 in. (13 mm)

mounting rod. See F IG . 6.

2.

Position the gun and tighten the two set screws.

For added positioning reliability, insert a 1/8 in. (3 mm) locating pin (NN) into the slot in the bracket and through

a hole in the rod. See the detail in F IG . 6.

Connect the Air and Fluid Lines

F IG . 2 shows a schematic of air and fluid line connec-

tions, and F IG . 7 shows the manifold connections. Con-

nect the air and fluid lines as instructed.

To reduce the risk of electric shock or other serious injury, the turbine air supply hose must be electrically connected to a true earth ground. Use only Graco

Grounded Air Supply Hose.

102

103

To nozzle tip

7.39 in.

(187.7 mm)

8.75 in.

(222.3 mm)

2.88 in.

(73.2 mm)

1.

Connect the Graco Grounded Air Supply Hose (B) to the gun's turbine air inlet (TA) and connect the hose ground wire (A) to a true earth ground (N). The gun turbine air inlet fitting has left-hand threads to prevent connecting another type of air hose to the

turbine air inlet. See Accessories on page 44 for

further information about the hose.

2.

Check the electrical grounding of the gun as

instructed on page 13.

3.

Before connecting the fluid line (P1), blow it out with air and flush it with solvent. Use solvent which is compatible with the fluid to be sprayed.

NN

TI13428a

03460

F IG . 6. Mounting Bracket

10 313227A

Installation

Manifold Connections

A1

A2

CYL

EXH

FO

KV1

KV2

P1

TA

Atomization Air Inlet Fitting

Connect a 3/8 in. (10 mm) OD tube between this fitting and the air supply.

Fan Air Inlet Fitting

Connect a 3/8 in. (10 mm) OD tube between this fitting and the air supply.

Cylinder Air Inlet Fitting

Connect a 5/32 in. (4 mm) OD tube between this fitting and the solenoid. For quicker response, use the shortest hose length possible.

Shroud Exhaust Outlet Fitting

Connect a 1/4 in. (6 mm) OD x 4 ft (1.22 m) long tube to this fitting.

Fiber Optic Fitting (Optional)

Connect the Graco Fiber Optic cable (see page 11).

kV Switch 1 Air Inlet Fitting

Connect a 5/32 in. (4 mm) OD tube between this fitting and the solenoid.

kV Switch 2 Air Inlet Fitting

Connect a 5/32 in. (4 mm) OD tube between this fitting and the solenoid.

Fluid Supply Inlet Fitting

Connect a 1/4 npsm swivel fitting between this fitting and the fluid supply.

Turbine Air Inlet Fitting

Connect the Graco Electrically Conductive Air Hose between this fitting (left-hand thread) and the solenoid.

Connect the air hose ground wire to a true earth ground.

KV2

TA

CYL

A1

P1

KV1

FO

A2

Optional Fiber Optic Cable

Connection

An optional fiber optic fitting is shipped unassembled with the gun. If an ES (kV) display module is used,

install the fitting in the FO port of the manifold. See F IG .

3, page 8, for a schematic of the fiber optic connections.

1.

Remove the plug (120) from the fiber optic port, and install the fiber optic fitting (5, shipped loose with the

gun). See F IG . 8.

5

120

F IG . 8. Fiber Optic Fitting

TI1580A

2.

Remove the nut (AA) from the fiber optic fitting (5) and slide the nut over the end of the fiber optic cable

(BB). See F IG . 9.

3.

Push the cable (BB) into the fitting (5) until it bottoms out. Tighten the nut (AA) to secure the cable.

4.

Most of the fiber optic light transmission loss occurs at the bulkhead splices. For the strongest light signals, use a minimum number of bulkhead splices. A maximum of two splices, with a total of 108 ft (33 m) of cable, is recommended.

5.

See manual 308265 to install a Graco ES Display

Module.

5

EXH

BB

AA

F IG . 7. Manifold Connections

TI1577A

TI1581A

F IG . 9. Fiber Optic Cable

313227A 11

Installation

Grounding

When operating the electrostatic gun, any ungrounded objects in the spray area (people, containers, tools, etc.) can become electrically charged.

Improper grounding can result in static sparking, which can cause a fire, explosion, or electric shock.

Follow the grounding instructions below.

The following are minimum grounding requirements for a basic electrostatic system. Your system may include other equipment or objects which must be grounded.

Check your local electrical code for detailed grounding instructions. Your system must be connected to a true earth ground.

Pump: ground the pump by connecting a ground wire and clamp as described in your separate pump instruction manual.

Electrostatic Air Spray Gun: ground the gun by connecting the Graco Grounded Air Hose to the turbine air inlet and connecting the air hose ground wire to a

true earth ground. See Check Electrical Ground-

ing, page 13.

• Air compressors and hydraulic power supplies: ground the equipment according to the manufacturer's recommendations.

All air and fluid lines must be properly grounded.

All electrical cables must be properly grounded.

All persons entering the spray area: shoes must have conductive soles, such as leather, or personal grounding straps must be worn. Do not wear shoes with non-conductive soles such as rubber or plastic.

Object being sprayed: keep the workpiece hangers clean and grounded at all times. Resistance must not exceed 1 megohm.

The floor of the spray area: must be electrically conductive and grounded. Do not cover the floor with cardboard or any non-conductive material which would interrupt grounding continuity.

Flammable liquids in the spray area: must be kept in approved, grounded containers. Do not use plastic containers. Do not store more than the quantity needed for one shift.

• All electrically conductive objects or devices in the

spray area: including fluid containers and wash cans, must be properly grounded.

12 313227A

Installation

Check Electrical Grounding

Fire, Explosion, and Electric Shock Hazard

Megohmmeter Part No. 241079 (AA-see F IG . 10) is

not approved for use in a hazardous area. To reduce the risk of sparking, do not use the megohmmeter to check electrical grounding unless:

The gun has been removed from the hazardous area;

or all spraying devices in the hazardous area are turned off, ventilation fans in the hazardous area are operating, and there are no flammable vapors in the area (such as open solvent containers or fumes from spraying).

Failure to follow this warning could cause fire, explosion, and electric shock and result in serious injury and property damage.

5.

If the resistance is greater than the maximum reading specified above for your hose, check the tightness of the ground connections and be sure the turbine air hose ground wire is connected to a true earth ground. If the resistance is still too high, replace the turbine air hose.

N

B

AA

TA

TI1584A

1.

Have a qualified electrician check the electrical grounding continuity of the spray gun and turbine air hose.

2.

Make sure the turbine air hose (B) is connected and the hose ground wire is connected to a true earth ground.

3.

Turn off the air and fluid supply to the gun. The fluid hose must not have any fluid in it.

4.

Measure the resistance between the turbine air inlet fitting (TA) and a true earth ground (N). a.

If using a black or grey turbine air hose, use a megohmmeter to measure the resistance. Use an applied voltage of 500 minimum to 1000 volts maximum. The resistance should not exceed 1 megohm.

b.

If using a red turbine air hose, use an ohmmeter to measure the resistance. The resistance should not exceed 100 ohms.

F IG . 10. Check Gun Grounding

313227A 13

Installation

Check Fluid Resistivity

Fire, Explosion, and Electric Shock Hazard

Check the fluid resistivity in a non-hazardous area only. Resistance Meter 722886 and Probe 722860 are not approved for use in a hazardous area.

Failure to follow this warning could cause fire, explosion, or electric shock and result in serious injury and property damage.

Graco Part No. 722886 Resistance Meter and 722860

Probe are available as accessories to check that the resistivity of the fluid being sprayed meets the requirements of an electrostatic air spray system.

Follow the instructions included with the meter and probe. If the material is above 1 megohm-cm, then a Pro

Xs Auto HC gun may be a better option. The Pro Xs WB gun is intended to spray very conductive waterborne materials and other materials less than 1 megohm-cm.

Check Fluid Viscosity

To check fluid viscosity you will need:

• a viscosity cup

• a stopwatch.

1.

Completely submerge the viscosity cup in the fluid.

Lift the cup out quickly, starting the stopwatch as soon as the cup is completely removed.

2.

Watch the stream of fluid coming from the bottom of the cup. As soon as there is a break in the stream, shut off the stopwatch.

3.

Record the fluid type, elapsed time, and size of the viscosity cup.

4.

If the viscosity is too high or too low, contact the material supplier. Adjust as necessary.

Install the Fabric Cover

1.

Install a fabric cover (XX) over the front of the gun and slide it back to cover the exposed tubing and

hoses at the back of the manifold. See F IG . 11.

2.

Route the exhaust tube (YY) outside the cover. This enables you to monitor the exhaust tube for the

presence of any paint or solvent. See Check for

Fluid Leakage on page 21. Strap down the exhaust

tube to prevent it from moving around.

YY

F IG . 11. Fabric Cover

XX

TI13429a

14

YY

TI1579A

313227A

advertisement

Related manuals

advertisement