ESAB LPH 50 User manual

LPH 50

Bruksanvisning

Brugsanvisning

Bruksanvisning

Käyttöohjeet

Instruction Manual

Betriebsanweisung

Manuel d’instructions

Gebruiksaanwijzing

Instrucciones de uso

Instruzioni per l’uso

Manual de instruções

Οδηγίες χρήσεως

Instrukcja obsługi

0349 301 027 010212 Valid for serial no. 107-xxx-xxxx

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1. DIRECTIVE .............................................................................................................................................. 44

2. SAFETY ................................................................................................................................................... 44

3. INTRODUCTION ...................................................................................................................................... 46

3.1 GENERAL .............................................................................................................................................. 46

3.2 SCOPE OF MANUAL............................................................................................................................. 46

3.3 TECHNICAL DATA ................................................................................................................................ 46

3.4 LPH 50 CUTTING SET PACKAGE........................................................................................................ 46

4. INSTALLATION ....................................................................................................................................... 47

4.1 GENERAL .............................................................................................................................................. 47

4.2 EQUIPMENT REQUIRED...................................................................................................................... 47

4.3 LOCATION............................................................................................................................................. 47

4.4 INSPECTION ......................................................................................................................................... 47

4.5 AIR LINES CONNECTIOINS ................................................................................................................. 47

4.6 PRIMARY ELECTRICAL CONNECTIONS............................................................................................ 47

4.7 SECONDARY CONNECTIONS............................................................................................................. 48

5 OPERATION ............................................................................................................................................ 50

5.1 LPH 50 CONTROLS .............................................................................................................................. 50

6 MAINTENANCE ....................................................................................................................................... 51

6.1 CLEANING ............................................................................................................................................. 51

7 CUTTING WITH PT 27 TORCH............................................................................................................... 51

7.1 PIERCING TECHNIQUE........................................................................................................................ 52

8. FAULT TRACING .................................................................................................................................... 52

8.1 COMMON CUTTING PROBLEMS ........................................................................................................ 52

9. SPARE PARTS ...................................................................................................................................... 133

10. ORDERING OF SPARE PARTS........................................................................................................ 137

11. SCHEMATIC DIAGRAM .................................................................................................................... 138

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1. DIRECTIVE

2. SAFETY

Full responsibility for safety of personnel working on or near system rests on user of ESAB Welding

Equipment.

Wrong operation can lead to abnormal situation, injure operator and damage equipment.

All personnel working with welding equipment must be fully familiar with

- handling of equipment

- location of emergency stops

- functions of equipment

- applicable safety regulations

- welding

Operator must make sure

- no one stays inside work area while machine starts

- no one is unprotected while arc is being struck

Work area must be

- suitable for welding

- free of machine parts, tools and other objects that can obstruct operator moving within area

- so arranged, that emergency stop buttons are easily accessible

- free from draughts

Personal safety equipment

- always use proper safety equipment such as goggles, non flammable clothing, protective gloves

- never wear loose clothing, belts, bracelets, rings etc., which may catch on equipment or cause burns

Miscellaneous

- only authorised personnel may operate electrical equipment

- check whether return cables are properly fitted and earthen

- requisite fire fighting equipment should be easily available in specially and clearly marked areas

- lubrication and maintenance of welding equipment must not be proceed during operation.

DECLARATION OF CONFORMITY

Esab Welding Equipment AB, S-695 81 Laxå, Sweden, gives its unreserved guarantee that

Plasma Arc Cutting Set LPH 50 from serial number 909 complies with standard EN 60974-1, in

accordance with the requirements of directive (73/23/EEC) and addendum (93/68/EEC) and with

standard EN 50192, EN 50199, in accordance with the requirements of directive (89/336/EEC) and

addendum (93/68/EEC).

----------------------------------------------------------------------------------------------------------------------------------

Göteborg 99-08-30

Bo Sjöberg

Managing Director

ESAB AB

Box 8004

402 77 Göteborg

Sweden Tel: +4631 50 90 00 Fax: +4631 50 92 61

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! WARNING !

ARC WELDING AND CUTTING CAN BE INJURIOUS TO YOURSELF AND OTHERS. TAKE

PRECAUTIONS WHEN WELDING. ASK YOUR EMPLOYER FOR SAFETY PRACTICES THAT SHOULD

BE BASED ON MANUFACTURER’S HAZARD DATA.

ELECTRIC SHOCK - Can kill

- Install and earth welding equipment in accordance with obligatory standards.

- Do not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothes.

- Insulate yourself from earth and workpiece.

- Ensure your work position is safe.

FUMES AND GASES - Can be dangerous to your health

- Keep your head away from fumes.

- Use ventilation and/or extraction to keep fumes and gases away from your breathing zone

and surroundings.

ARC RAYS - Can injure eyes and burn skin

- Protect your eyes and skin. Use correct welding screens, filter lens and wear protective clothes.

- Protect bystanders with suitable screens or curtains.

FIRE HAZARD

- Sparks (spatter) can cause fire. Make therefore sure there are no inflammable materials nearby.

NOISE - Excessive noise can damage your hearing.

- Protect your ears. Use ear defenders or other hearing protection.

- Warn bystanders of the risk.

MALFUNCTION - Call expert assistance in event of malfunction.

READ AND UNDERSTAND THE INSTRUCTION MANUAL BEFORE INSTALLING OR OPERATING UNIT

PROTECT YOURSELF AND OTHERS!

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3. INTRODUCTION

CAUTION!

All warranty undertakings of supplier cease to apply if customer attempts to rectify any faults on

machine during warranty period.

NOTE. Supplier reserves right to make changes within the unit without further notice.

3.1 GENERAL

LPH 50 is compact, self-contained plasma cutting system. As shipped, it’s fully assembled and ready to

operate after being installed. The set consists of LPH 50 power source and heavy duty PT 27 torch, and is

capable of severing materials up to 15 mm thick.

! WARNING !

Use only ESAB Plasmarc torches that are appropriated for use with this power source. Use of other

type of torch may cause ELECTRIC SHOCK HAZARD. Do not use any other torch for use with LPH

50.

3.2 SCOPE OF MANUAL

Purpose of this manual is to provide the operator all information necessary to install and operate LPH 50 set.

Technical reference materials are enclosed, to help with possible troubleshooting.

3.3 TECHNICAL DATA

Rated 60% Duty Cycle* 50A 50A

Output 100% Duty Cycle* 30A 30A

Output Current Range

30÷50A 30÷50A

Open Circuit Voltage 320V 320V

Supply cable 4x2.5 mm

4x6/4x2.5/4x2.5 mm

Rated primary input (max) 400-415V

3~50/60Hz

24A/phase

230V/400-415V/440V

3~50/60Hz

42A/24A/22A/phase

Air Requirements PT 27 118 l/min 4,5bar 118 l/min 4,5bar

Max. cutting thickness 15 mm

Dimensions Length

Height

Width

680

715

325

680

715

325

Weight of LPH 50 89kg 90kg

(*) Duty cycle is based on a 10-minute period; therefore, a 60 % duty cycle means that the power source

may operate for 6 minutes with a cool down period of 4 minutes.

100 % duty cycle means continuous operation of the power source.

NOTE: machine has enclosure class IP23 which means, that it can be operated indoors and outdoors.

NOTE: symbol S points, that unit may be operated in areas of increased electric shock hazard.

3.4 LPH 50 CUTTING SET PACKAGE

Item No. Qty. Req.

400-415V

3~ 50/60Hz

Qty. Req.

230V/400-415V/440V

3~ 50/60Hz

Part No. Description

1 1 - 0457 289 880 Plasma arc source LPH 50

2 - 1 0457 289 881 Plasma arc source LPH 50

3 1 1 0457 289 005 Current wire with clamp

4 2 2 0457 290 048 Fuse element 1,6A

5 1 1 0457 290 071 Quick detachable coupling

6 1 1 0457 290 072 Hose clip

7 1 1 0349 301 027 Instruction manual LPH 50

8 1 1 0558 000 487 Plasma cutting torch PT 27

9 1 1 0456 176 001 Instruction manual PT 27

10 1 1 0349 302 130 Stand off guide

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4. INSTALLATION

4.1 GENERAL

Correct installation is very important for trouble-free and satisfactory operation of LPH 50.

It is suggested that each step of this section is carefully studied and followed.

4.2 EQUIPMENT REQUIRED

Source of clean and dry compressed air capable of forcing air flow rate of 150l/min @ 4,5 – 5,2 bar.

Maximum air pressure at unit input should not exceed 7 bars.

4.3 LOCATION

Adequate ventilation is necessary to provide proper cooling of power source. Amount of dirt, dust and

excessive heat, that unit is exposed to, should be minimised. Between LPH 50 and wall (or any obstruction)

should remain distance of at least 300 mm, to secure proper air movement through it.

CAUTION

Installation of any kind of filtering device will reduce volume of through-flowing air, subjecting

therefore interior of machine to overheating. Warranty is void if any type of filter device is employed.

4.4 INSPECTION

A. Remove shipping container and all packing stuff and inspect unit for any sign of damage. Notify

transporters of any defects or damages at once.

B. Check container for any loose parts before disposal.

C. Check air louvers and any other openings to make sure any obstruction is removed.

4.5 AIR LINES CONNECTIOINS

To assembly air lines put on it hose clip and press in quick detachable coupling, that are delivered in

container, and tighten clip next to hose end.

4.6 PRIMARY ELECTRICAL CONNECTIONS

! WARNING !

ELECTRIC SHOCK CAN KILL! Precautionary measurements should be made to provide maximum

protection against electric shock. Disconnect power cable from mains socket before any

connections are made inside power source.

! WARNING !

Operator must make sure, if unit is properly configured for mains voltage.

LPH 50 machines are equipped with 3m, 4-strands power cables for 3-phase mains connection. Switch

board that unit is to be fed from must be equipped with proper line fuses or circuit breakers (see TECHNICAL

DATA). Power cable may be connected directly to wall disconnect switch or be equipped with suitable plug.

! WARNING !

Chassis must be properly connected to ground. Otherwise it may result in electric shock, burns or

death.

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4.7 SECONDARY CONNECTIONS

! WARNING !

Before making any connections make sure unit is disconnected from mains.

1. Connect air supply line to inlet of regulator.

2. Clamp work cable to workpiece. Make sure the workpiece is connected to ground with properly sized

cable.

Fig. 4-1. LPH 50 connection diagram

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Fig. 4-2. Ground and current cable connections.

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5 OPERATION

! WARNING !

ELECTRIC SHOCK CAN KILL!

- Do not operate unit with cover removed.

- Do not feed unit while it’s being held or carried.

- Do not touch any part of torch head (nozzle, heat shield, electrode) when unit is turned on.

! WARNING !

ARC RAYS CAN BURN EYES OR SKIN!

NOISE CAN DAMAGE HEARING!

- Wear helmet with No. 6 or 7 lens.

- Wear eye, ear and body protection.

CAUTION

Position machine at least 3 m from cutting zone. Sparks and hot slag can damage it.

5.1 LPH 50 CONTROLS

A. POWER SWITCH. Turns the unit on when set to 30A/50A position, ‘power’ indicator lights green, fan

starts running.

B. OUPUT CURRENT CONTROL. Stepwise by means of POWER SWITCH.

C. AIR TEST BUTTON. In ‘test’ position allows to adjust desired pressure value (4,5 bar). Hold button

pressed for several seconds, that will remove possible condensation from lines.

D. FAULT LIGHT. Will glow yellow under following conditions:

FLOW FAULT. Indicates too low air flow rate. (continuous light, only when el-valve opened)

OVER TEMPERATURE. Indicates that duty cycle has been exceeded. (flashing light)

Allow unit to cool down before returning to work.

After fault abates, all signals will automatically reset.

E. ARC-ON LIGHT. When lit red indicates that main contactor is closed, which means torch is

energised and source is ready to cut. In case of no indication while torch switch is depressed

immediately turn the machine off and call service.

NOTE: ARC ON light may turn off if within 2 sec since torch switch is depressed cutting process will not be

proceed. It is automatic feature that guarantees safe operation of machine (obligatory for units with S

symbol).

Fig. 5-1. LPH 50 Controls.

No. Description

power switch knob

“power on” LED

air test button

“arc on” LED

“fault” LED

pressure gauge

line outlet (rubber)

current cable socket

wheel

air filter-preregulator

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6 MAINTENANCE

NOTE: All warranty undertakings given by supplier cease to apply if customer attempts to rectify any

faults on machine during warranty period.

6.1 CLEANING

A. Power source should be regularly blown with dry compressed air at reduced pressure, more frequently in

dirty environment.

B. Occasionally bleed water or oil from steam trap.

7 CUTTING WITH PT 27 TORCH

Use the following procedures to cut with the PT 27 torch.

A. Hold the torch nozzle approximately 3 to 5 mm above the work and tilted at about 15-30º. This reduces

the chance of spatter entering the nozzle.

B. Depress the torch switch. Air should flow from the torch nozzle.

C. Two seconds after depressing the torch switch, (at first start or after 1 min pause) the pilot arc should

start. The main arc should immediately follow, allowing the cut to begin.

D. After starting the cut, the torch should be maintained at a 5-15º forward angle. This angle is especially

useful in helping to create a “drop” cut. When not using the standoff guide, the nozzle should be held

approximately 2 mm from the work.

E. When ending a cut, the torch switch should be released and lifted off the workpiece just before the end of

the cut. This is to prevent the high frequency from re-igniting after cutting arc extinguishes and causing

damage to the nozzle (double arcing).

F. For rapid re-starts, such as grate or heavy mesh cutting, do not release the torch switch. In the postflow

mode (i.e. 1 min period, when el-valve remains opened), the arc can restart immediately by depressing

the torch switch. So as to avoid the 2-second preflow portion of the cutting cycle, work should be

undertaken within 1 min.

NOTE: When replacing the nozzle, always inspect the electrode for wear. If less than 17,6 mm of electrode is

remaining, replace the electrode. If the electrode is used beyond this recommended wear limit,

damage to the torch and power source may occur. Nozzle life is also greatly reduced when using the

electrode below the recommended limit. Refer to Figure 7-1.

Fig. 7-1. Electrode wear limit Fig. 7-2. Effect of cutting speed.

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7.1 PIERCING TECHNIQUE

Fig.7-3. Piercing technique using PT 27 torch.

8. FAULT TRACING

8.1 COMMON CUTTING PROBLEMS

Below are listed common cutting problems, followed by possible cause of each. If problems are caused by

power source, refer to maintenance section of this manual. If it’s still impossible to correct the problem,

contact your ESAB distributor.

A. Insufficient penetration.

1. Too low current.

2. Cutting speed too fast.

3. Damaged cutting nozzle.

4. Improper air pressure.

5. Low air flow rate.

E. Uneven arc.

1. Damaged nozzle or worn electrode.

B. Main arc extinguishes.

1. Cutting speed too slow.

2. Worn electrode

F. Unstable cutting conditions.

1. Incorrect cutting speed.

2. Lose cable or hose connections.

3. Electrode and/or nozzle in poor condition.

C. Dross formation.

(For some material thickness it may be impossible to get dross free

cuts.)

1. Current too low.

2. Cutting speed too fast or too slow.

3. Improper air pressure.

4. Defective nozzle or electrode.

5. Low air flow rate.

G. Main arc does not transfer.

1. Worn electrode.

2. Loose connections.

3. Worn cable.

D. Double arcing.

1. Low air pressure.

2. Damaged cutting nozzle.

3. Loose cutting nozzle.

4. Heavy spatter accumulation on nozzle.

H. Short consumables life.

1. Improper gas pressure.

2. Loose connections.

3. Low air flow rate.

ESAB LPH 50 User manual

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