Nordson NPE-LF10 Reference guide

NPE-LF10 and NPE-HF10

Powder Spray Guns

Customer Product Manual

Part 108191C

Issued 6/03

NORDSON CORPORATION AMHERST, OHIO USA

For parts and technical support, call the Industrial Coating

Systems Customer Support Center at (800) 433-9319 or

contact your local Nordson representative.

This document is subject to change without notice.

Check http://emanuals.nordson.com for the latest version.

Part 108191C E2003 Nordson Corporation

tents

Table of Contents

Safety 1.......................................

Qualified Personnel 1.........................

Intended Use 1..............................

Regulations and Approvals 1..................

Personal Safety 2............................

Fire Safety 2................................

Grounding 3.................................

Action in the Event of a Malfunction 3...........

Disposal 3..................................

Safety Label 4...............................

Description 5..................................

Specifications 6..............................

Air Supply 6.................................

Installation 6..................................

Gun Mounting 6..............................

Electrostatic Cable Installation 7................

Powder-Feed Hose Installation 8...............

Cooling Air Connection 8......................

Operation 9...................................

Start Up 9...................................

Maintenance 10..............................

Daily 10...................................

Periodically 10..............................

Troubleshooting 11.............................

Repair 12......................................

Gun Resistor Replacement 12...................

Powder Tube Replacement 12..................

Electrostatic Cable Replacement 13..............

Parts 14.......................................

Using the Illustrated Parts List 14...............

NPE-LF10 Gun 15.............................

NPE-HF10 Gun 16............................

Options 18...................................

Conversion Kits 18..........................

Nordson Corporation welcomes requests for information, comments, and

inquiries about its products. General information about Nordson can be

found on the Internet using the following address:

http://www.nordson.com.

Address all correspondence to:

Nordson Corporation

Attn: Customer Service

555 Jackson Street

Amherst, OH 44001

Notice

This is a Nordson Corporation publication which is protected by copyright.

Original copyright date 1992. No part of this document may be

photocopied, reproduced, or translated to another language without the

prior written consent of Nordson Corporation. The information contained

in this publication is subject to change without notice.

Trademarks

Nordson and the Nordson logo are registered trademarks of Nordson

Corporation.

Loctite and SuperBonder are registered trademarks of Henkel Loctite

Corporation.

NPE-LF10 and NPE-HF10 Powder Spray Guns 1

Part 108191C

E2003 Nordson Corporation

NPE-LF10 and NPE-HF10 Powder Spray Guns

Safety

Read and follow these safety instructions. Task- and equipment-specific

warnings, cautions, and instructions are included in equipment

documentation where appropriate.

Make sure all equipment documentation, including these instructions, is

accessible to all persons operating or servicing equipment.

Qualified Personnel

Equipment owners are responsible for making sure that Nordson equipment

is installed, operated, and serviced by qualified personnel. Qualified

personnel are those employees or contractors who are trained to safely

perform their assigned tasks. They are familiar with all relevant safety rules

and regulations and are physically capable of performing their assigned

tasks.

Intended Use

Use of Nordson equipment in ways other than those described in the

documentation supplied with the equipment may result in injury to persons

or damage to property.

Some examples of unintended use of equipment include

Susing incompatible materials

Smaking unauthorized modifications

Sremoving or bypassing safety guards or interlocks

Susing incompatible or damaged parts

Susing unapproved auxiliary equipment

Soperating equipment in excess of maximum ratings

Regulations and Approvals

Make sure all equipment is rated and approved for the environment in which

it is used. Any approvals obtained for Nordson equipment will be voided if

instructions for installation, operation, and service are not followed.

All phases of equipment installation must comply with all federal, state, and

local codes.

NPE-LF10 and NPE-HF10 Powder Spray Guns

Part 108191C E2003 Nordson Corporation

Personal Safety

To prevent injury follow these instructions.

SDo not operate or service equipment unless you are qualified.

SDo not operate equipment unless safety guards, doors, or covers are

intact and automatic interlocks are operating properly. Do not bypass or

disarm any safety devices.

SKeep clear of moving equipment. Before adjusting or servicing any

moving equipment, shut off the power supply and wait until the

equipment comes to a complete stop. Lock out power and secure the

equipment to prevent unexpected movement.

SRelieve (bleed off) hydraulic and pneumatic pressure before adjusting or

servicing pressurized systems or components. Disconnect, lock out,

and tag switches before servicing electrical equipment.

SObtain and read Material Safety Data Sheets (MSDS) for all materials

used. Follow the manufacturer’s instructions for safe handling and use

of materials, and use recommended personal protection devices.

STo prevent injury, be aware of less-obvious dangers in the workplace

that often cannot be completely eliminated, such as hot surfaces, sharp

edges, energized electrical circuits, and moving parts that cannot be

enclosed or otherwise guarded for practical reasons.

Fire Safety

To avoid a fire or explosion, follow these instructions.

SDo not smoke, weld, grind, or use open flames where flammable

materials are being used or stored.

SProvide adequate ventilation to prevent dangerous concentrations of

volatile materials or vapors. Refer to local codes or your material MSDS

for guidance.

SDo not disconnect live electrical circuits while working with flammable

materials. Shut off power at a disconnect switch first to prevent

sparking.

SKnow where emergency stop buttons, shutoff valves, and fire

extinguishers are located. If a fire starts in a spray booth, immediately

shut off the spray system and exhaust fans.

SClean, maintain, test, and repair equipment according to the instructions

in your equipment documentation.

SUse only replacement parts that are designed for use with original

equipment. Contact your Nordson representative for parts information

and advice.

NPE-LF10 and NPE-HF10 Powder Spray Guns 3

Part 108191C

E2003 Nordson Corporation

Grounding

WARNING: Operating faulty electrostatic equipment is hazardous and can

cause electrocution, fire, or explosion. Make resistance checks part of your

periodic maintenance program. If you receive even a slight electrical shock

or notice static sparking or arcing, shut down all electrical or electrostatic

equipment immediately. Do not restart the equipment until the problem has

been identified and corrected.

All work conducted inside the spray booth or within 1 m (3 ft) of booth

openings is considered within a Class 2, Division 1 or 2 Hazardous location

and must comply with NFPA 33, NFPA 70 (NEC articles 500, 502, and 516),

and NFPA 77, latest conditions.

SAll electrically conductive objects in the spray areas shall be electrically

connected to ground with a resistance of not more than 1 megohm as

measured with an instrument that applies at least 500 volts to the circuit

being evaluated.

SEquipment to be grounded includes, but is not limited to, the floor of the

spray area, operator platforms, hoppers, photoeye supports, and

blow-off nozzles. Personnel working in the spray area must be

grounded.

SThere is a possible ignition potential from the charged human body.

Personnel standing on a painted surface, such as an operator platform,

or wearing non-conductive shoes, are not grounded. Personnel must

wear shoes with conductive soles or use a ground strap to maintain a

connection to ground when working with or around electrostatic

equipment.

SOperators must maintain skin-to-handle contact between their hand and

the gun handle to prevent shocks while operating manual electrostatic

spray guns. If gloves must be worn, cut away the palm or fingers, wear

electrically conductive gloves, or wear a grounding strap connected to

the gun handle or other true earth ground.

SShut off electrostatic power supplies and ground gun electrodes before

making adjustments or cleaning powder spray guns.

SConnect all disconnected equipment, ground cables, and wires after

servicing equipment.

Action in the Event of a Malfunction

If a system or any equipment in a system malfunctions, shut off the system

immediately and perform the following steps:

SDisconnect and lock out electrical power. Close pneumatic shutoff

valves and relieve pressures.

SIdentify the reason for the malfunction and correct it before restarting the

equipment.

Disposal

Dispose of equipment and materials used in operation and servicing

according to local codes.

NPE-LF10 and NPE-HF10 Powder Spray Guns

Part 108191C E2003 Nordson Corporation

Safety Label

Table 1 contains the text of the safety label on this equipment. The safety

label is provided to help you operate and maintain your equipment safely.

Table 1 Safety Label

Part Description

244644

WARNING: The following procedures MUST be followed when working with

this electrostatic spray equipment. Failure to follow these instructions may

result in a fire and/or serious personal injury. Display this warning on the spray

booth.

1. NO SMOKING. Keep open flames, hot surfaces, and sparks from torches or

grinding away from booth.

2. Turn the electrostatic power unit off when the spray gun is not in use.

3. Shut down immediately in event of fire.

4. Maintain ground circuit on all conductive objects below 1 megohm to prevent

sparking. (ANSI/NFPA 33, Chapter 9, or local codes).

5. Shut down operation and correct grounds if sparking occurs.

6. Install fixed fire suppression system in accordance with ANSI/NFPA 33,

Chapter 7 (or local codes), before operating with combustible powder.

7. Install automatic flame detectors in accordance with ANSI/NFPA 33,

Chapter 7 (or local codes), before operating automatic guns

8. Examine all equipment at the beginning of each work period and repair or

replace any damaged, loose, or missing parts.

9. Before cleaning or performing any maintenance on the electrostatic spray

gun, turn off the power unit and ground the nozzle. Maintain electrostatic

spray equipment in accordance with instruction manual. Do not deviate. Do

not substitute parts from other manufacturers.

10. Operator must be grounded to prevent shocks from static electricity. Floor

surface must be conductive. Footwear and gloves must be static dissipative

in accordance with ANSI Z41-1991 (or local codes).

11. Air velocity through all booth openings must meet local requirements and

contain powder within the booth. If powder escapes from the booth, shut

down operation and correct the malfunction.

12. Powder may be toxic or be a nuisance dust hazard. Refer to supplier’s

MSDS. If exposed to dust during operation, maintenance, or clean up,

operators must use appropriate personal protective equipment.

13. Do not use compressed air or organic solvents for removal of powder from

skin or clothing. Do use soap and water. Wash hands before eating or

smoking.

14. Guns, feeders, booths, etc., may be cleaned with clean dry air at 1.7 bar

(25 psig).

If you have any questions concerning this electrostatic spray equipment, call

(440) 988-9411, and ask to speak with the Powder Systems Group Technical

Service Department.

NPE-LF10 and NPE-HF10 Powder Spray Guns 5

Part 108191C

E2003 Nordson Corporation

Description

The NPE-LF10 and NPE-HF10 are corona-type automatic electrostatic

powder spray guns. The NPE-LF10 is used in low-to-medium volume

powder coating applications. The NPE-HF10 is used in high volume

applications. A typical application is pipe coating, where the powder is

sprayed onto hot pipe at close range. To allow the spray gun to function in

these conditions, cooling air is circulated through the spray gun.

The NPE-LF10 and NPE-HF10 spray guns are the same except for the

powder tube and nozzles, which are interchangeable. Conversion kits are

available, one to convert a LF10 to a HF10, and one to convert a HF10 to a

LF10. Different pumps and hoses are used with each version, and must be

ordered separately.

The spray guns are used with Nordson model EXP-100 or -100M

electrostatic power units. These power units can put out up to 100 kilovolts.

The spray guns are connected to the power unit by electrostatic cables.

Cables are available in 8- or 16-meter (25- or 50-ft) lengths. Venturi-type

powder pumps supply powder to the spray guns.

123

Figure 1 NPE-LF10 and HF10 Spray Guns

1. Rear support

2. Cable adapter

3. Powder tube

4. Cooling air connector

5. Tube clamp and mounting block

6. Cooling air tube

7. Front support

8. Nozzle

9. Electrode and support

10. Cable well

11. Cover

NPE-LF10 and NPE-HF10 Powder Spray Guns

Part 108191C E2003 Nordson Corporation

Specifications

Table 2 Dimensions

Dimensions mm (in.)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Height

ÁÁÁÁÁÁÁÁÁÁÁÁ

80 (3.125)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Length (overall)

ÁÁÁÁÁÁÁÁÁÁÁÁ

389 (15.3)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Length (mounting hole forward)

ÁÁÁÁÁÁÁÁÁÁÁÁ

306.4 (12)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Mounting hole diameter

ÁÁÁÁÁÁÁÁÁÁÁÁ

13 (0.5)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Powder feed hose ID:

NPE-LF10

NPE-HF10

ÁÁÁÁÁÁÁÁÁÁÁÁ

13 (0.5)

19 (0.75)

Air Supply

Powder spray systems require clean, dry, oil-free operating air. Moist or

oil-contaminated air can cause the powder to clog in the pump venturi

throat, feed hose, or gun passages.

Use 3-micron filter/separators with automatic drains and a refrigerated or

regenerative desiccant-type air dryer that can produce a 3.4 _C (38 _F) or

lower dewpoint at 6.89 bar (100 psi).

Installation

WARNING: Allow only qualified personnel to perform the following tasks.

Follow the safety instructions in this document and all other related

documentation.

WARNING: Ground all electrically conductive equipment in the spray area.

Ungrounded or poorly grounded equipment can store an electrostatic

charge that can give personnel a severe shock or arc and cause a fire or

explosion.

See Figure 2.

Gun Mounting

Unpack the spray gun and install it on a gun mounting bar (6), gun stand, or

reciprocator arm. The clamp on the gun mounting bar shown in Figure 2 is

used with square or round bars (1) up to 25-mm (1-in.) in diameter.

The hole in the gun mounting block (7) is 13-mm (1/2-in.) in diameter.

Tighten the square head screw in the mounting block to hold the spray gun

in a fixed position.

NPE-LF10 and NPE-HF10 Powder Spray Guns 7

Part 108191C

E2003 Nordson Corporation

Electrostatic Cable Installation

The electrostatic cable is the high-voltage link between the power unit and

the spray gun. The cable must be properly installed and maintained. If it is

damaged, the high voltage can burn through the cable, arc to a grounded

object, and start a fire or explosion.

WARNING: Protect electrostatic cables from mechanical damage and

strong solvents. Inspect and test the cable frequently. A damaged cable

used in a hazardous environment can cause a fire or explosion that could

result in personal injury and property damage.

1. Remove the electrostatic cable (8) from the shipping box and carefully

unroll it. Establish a protected path between the electrostatic power unit

and the spray gun for the cable. The power unit end of the cable has a

metal tag on the threaded fitting and is tipped with a brass ball.

NOTE: Do not bend the cable around a radius of less than 150 mm (6 in.)

at stationary points or 200 mm (8 in.) at flexing points.

2. Secure the cable to the gun mounting bar and other supports so it is off

the floor and out of the way of moving equipment. If you are mounting

the spray gun on a reciprocator, secure the cable so it will not be

damaged by repeated rubbing against nearby equipment or the floor.

Allow enough slack to prevent any strain on the cable.

CAUTION: Clean the cable ends before connecting the cable to the gun

and power supply. Contaminants on the cable ends can cause arcing

between the voltage source and ground. This will damage the cable and

can significantly reduce gun performance.

3. Make sure the cable ends are clean and dry. Use isopropyl alcohol to

clean the cable ends.

4. Look into the cable adapter (9) and make sure the insulating tube is

filled with dielectric grease. Insert the spray gun end of the cable into

the cable adapter until it is pressing against the resistor spring (item 7,

Figure 3). Wipe off the dielectric grease extruded from the cable

adapter.

WARNING: The cable end and resistor spring must be completely

embedded in dielectric grease. Air pockets could allow the high voltage to

arc and burn through the insulating tube and cable well.

5. Thread the cable retaining nut onto the cable adapter and tighten it by

hand.

6. Remove the dust cap from the power unit cable well.

7. Remove the shipping spacer from the well and fill it with dielectric oil.

8. Insert the cable end into the well until it contacts the bottom. Thread the

cable retaining nut onto the cable well and tighten it by hand. Wipe up

any spilled oil.

NPE-LF10 and NPE-HF10 Powder Spray Guns

Part 108191C E2003 Nordson Corporation

Powder-Feed Hose Installation

1. Locate the spiral-cut tubing (4) and snap clamp (5) furnished with the

spray gun. Install them over the end of the powder feed hose (2).

2. Connect the powder-feed hose to the spray gun’s powder tube. Secure

the hose to the tube with the snap clamp. Move the spiral-cut tubing up

the hose to prevent it from kinking where it connects to the powder tube.

NOTE: If possible, the powder-feed hose should be no longer than 8 m

(25 ft). Longer lengths will decrease the flow of powder and may cause

uneven powder spray patterns or puffing.

Cooling Air Connection

Connect 1/4-in. flexible air tubing (3) between a regulated supply of

compressed air and the tube connector in the spray gun.

Figure 2 Gun Installation

1. Reciprocator arm or gun stand

2. Feed hose

3. 1/4-in. air tubing

4. Spiral-cut tubing

5. Snap clamp

6. Gun mounting bar

7. Mounting block

8. Electrostatic cable

9. Cable adapter

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