ESAB LAF 1251,LAF 1251M Instruction manual

GB

LAF 1251 /
LAF 1251M

Instruction manual

Valid for serial no. 935-xxx-xxxx,126-xxx-xxxx0449 505 001 GB 20110711

- 2 -

1 SAFETY 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 INTRODUCTION 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 TECHNICAL DATA 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 INSTALLATION 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Location 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Connections 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 OPERATION 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Controls 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 MAINTENANCE 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Cleaning 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.1 Welding power source 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.2 Contactor 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 ORDERING OF SPARE PARTS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DIAGRAM 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONNECTION INSTRUCTION 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ORDERING NUMBER 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rights reserved to alter specifications without notice.

TOCe

- 3 -

GB

1 SAFETY

Users of ESAB equipment have the ultimate responsibility for ensuring that anyone who works on or
near the equipment observes all the relevant safety precautions. Safety precautions must meet the
requirements that apply to this type of equipment. The following recommendations should be ob
served in addition to the standard regulations that apply to the workplace.

All work must be carried out by trained personnel well-acquainted with the operation of the equip
ment. Incorrect operation of the equipment may lead to hazardous situations which can result in in
jury to the operator and damage to the equipment.

1. Anyone who uses the equipment must be familiar with:

S its operation
S location of emergency stops
S its function
S relevant safety precautions
S welding and cutting

2. The operator must ensure that:
S no unauthorized person is stationed within the working area of the equipment when it is

started up.

S no-one is unprotected when the arc is struck

3. The workplace must:

S be suitable for the purpose
S be free from drafts

4. Personal safety equipment
S Always wear recommended personal safety equipment, such as safety glasses, flame-proof

clothing, safety gloves.

S Do not wear loose-fitting items, such as scarves, bracelets, rings, etc., which could become

trapped or cause burns.

5. General precautions

S Make sure the return cable is connected securely.
S Work on high voltage equipment may only be carried out by a qualified electrician.
S Appropriate fire extinquishing equipment must be clearly marked and close at hand.
S Lubrication and maintenance must not be carried out on the equipment during operation.

CAUTION

This product is solely intended for arc welding.

bb05de

- 4 -

© ESAB AB 2011

GB

WARNING

Arc welding and cutting can be injurious to yourself and others. Take precausions when welding and
cutting. Ask for your employer's safety practices which should be based on manufacturers' hazard
data.

ELECTRIC SHOCK - Can kill

S Install and earth the unit in accordance with applicable standards.
S Do not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothing.
S Insulate yourself from earth and the workpiece.
S Ensure your working stance is safe.

FUMES AND GASES - Can be dangerous to health

S Keep your head out of the fumes.
S Use ventilation, extraction at the arc, or both, to take fumes and gases away from your breathing zone

and the general area.

ARC RAYS - Can injure eyes and burn skin.

S Protect your eyes and body. Use the correct welding screen and filter lens and wear protective

clothing.

S Protect bystanders with suitable screens or curtains.

FIRE HAZARD

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

NOISE - Excessive noise can damage hearing

S Protect your ears. Use earmuffs or other hearing protection.
S Warn bystanders of the risk.

MALFUNCTION - Call for expert assistance in the event of malfunction.

Read and understand the instruction manual before installing or operating.

PROTECT YOURSELF AND OTHERS!

CAUTION

Class A equipment is not intended for use in residential locations where
the electrical power is provided by the public low-voltage supply system.
There may be potential difficulties in ensuring electromagnetic
compatibility of class A equipment in those locations, due to conducted
as well as radiated disturbances.

CAUTION

Read and understand the instruction manual before
installing or operating.

Dispose of electronic equipment at the recycling facility!

In observance of European Directive 2002/96/EC on Waste Electrical and Electronic
Equipment and its implementation in accordance with national law, electrical and/or
electronic equipment that has reached the end of its life must be disposed of at a
recycling facility.

As the person responsible for the equipment, it is your responsibility to obtain
information on approved collection stations.

For further information contact the nearest ESAB dealer.

ESAB can provide you with all necessary welding protection and accessories.

bb05de

- 5 -

© ESAB AB 2011

GB

2 INTRODUCTION

LAF 1251 / LAF 1251M are remote-controlled 3-phase welding power sources
designed for high-efficiency mechanical submerged-arc welding (SAW).

The welding power sources are fan-cooled and are monitored by a thermal cutout
against overload. When the thermal cutout is deployed the yellow lamp on the front
panel illuminates automatically. The reset is carried out automatically when the
temperature has decreased to a permitted level.

3 TECHNICAL DATA

LAF 1251 LAF 1251M

Mains connection: 400/415/500 V, 350 Hz

400/440/550 V, 360 Hz

Primary current I

Permissible load at:

100 % duty cycle 1250 A/ 44 V 1250 A/44 V

Setting range 100-1250 A /24-44 V 100-1250 A /24-44 V

No-load voltage 53 V 53 V

No-load power 210 W 210 W

Effiency 88% 88%

Power factor 0,94 0,94

Weight 490 kg 490 kg

Dimensions L x W x H 774 x 598 x 1430 774 x 598 x 1430

Insulation class
(transformer):

99 A I

max

H H

220/230/400/415/500 V, 350 Hz
230/400/440/550 V, 360 Hz

171 A

max

Enclosure class IP 23 IP 23

Application class

Enclosure class

The IP code indicates the enclosure class, i. e. the degree of protection against penetration by solid
objects or water. Equipment marked IP23 is designed for indoor and outdoor use.

Application class

The symbol indicates that the power source is designed for use in areas with increased
electrical hazard.

bb05de

- 6 -

© ESAB AB 2011