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Rights reserved to alter specifications without notice.
Änderungen vorbehalten.
Sous réserve de modifications sans avis préalable.
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Reservado el derecho de cambiar las especificaciones sin previo aviso.
Ci riserviamo il diritto di variare le specifiche senza preavviso.
Reservamo--nos o direito de alterar as especificações sem aviso prévio.
SPARE PARTS LIST69...................................................
TOCe
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GB
1DIRECTIVE
DECLARATION OF CONFORMITY
Esab Welding Equipment AB, S--695 81 Laxå, Sweden, gives its unreserved guarantee that welding power source LHF 250/400/630/800 from serial number 550 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 50199 in accordance with the requirements of directive (89/336/EEC) and addendum (93/68/EEC).
Paul Karlsson
Managing Director
Esab Welding Equipment AB
695 81 LAXÅ
SWEDENTel: + 46 584 81000Fax: + 46 584 12336
2SAFETY
WARNING
ARC WELDING AND CUTTING CAN BE INJURIOUS TO YOURSELF AND OTHERS. TAKE PRECAUTIONS WHEN WELDING. ASK FOR YOUR EMPLOYER’S SAFETY PRACTICES WHICH SHOULD BE
BASED ON MANUFACTURERS’ HAZARD DATA.
ELECTRIC SHOCK -- Can kill
SInstall and earth the welding unit in accordance with applicable standards.
SDo not touch live electrical parts or electrodes with bare skin, wet gloves or wet clothing.
SInsulate yourself from earth and the workpiece.
SEnsure your working stance is safe.
FUMES AND GASES -- Can be dangerous to health
SKeep your head out of the fumes.
SUse ventilation, extraction at the arc, or both, to keep fumes and gases from your breathing zone and
the general area.
ARC RAYS -- Can injure eyes and burn skin.
SProtect your eyes and body. Use the correct welding screen and filter lens and wear protective
clothing.
SProtect bystanders with suitable screens or curtains.
FIRE HAZARD
SSparks (spatter) can cause fire. Make sure therefore that there are no inflammable materials nearby.
NOISE -- Excessive noise can damage hearing
SProtect your ears. Use ear defenders or other hearing protection.
SWarn 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!
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3INTRODUCTION
LHF 250/400/630/800 are thyristor controlled welding rectifiers designed for welding
with coated electrodes, TIG welding and arc air gouging.
The welding rectifiers can be used with the following remote control devices:
PHA 1, PHA 2, PHA 5, PHB 1, PHB 2, och PHC 2.
An auxiliar y control unit is required for TIG welding with high frequency arc ignition.
LHF 400/630, versions with meters and timed cooling fan.
These welding rectifiers are equipped with a volmeter, ammeter and a circuit that
reduces the idle speed of the cooling fan.
The meters allow current and voltage settings to be read from the front of the
rectifier.
To minimise the amount of dust and dirt that is drawn into the rectifier the fan runs at
a reduced idle speed of 300 rpm. When welding with currents greater than 30 A the
fan speed increases to its working speed of around 1350 rpm. A timer relay
maintains the higher speed setting for 6 1/2 minutes after welding has stopped to
ensure adequate cooling of the rectifier.
3.1TECHNICAL DATA
LHF 250LHF 400LHF 630LHF 800
Maximum load
35 % duty cycle250 A/30 V400 A/36 V630 A/44 V800 A/44 V
60 % duty cycle200 A/28 V315 A/33 V500 A/40 V630 A/44 V
100 % duty cycle160 A/26 V250 A/30 V400 A/36 V500 A/40 V
Setting range8A/20V--250A/
30(33)V
Open circuit volt.78--84 V80 --87 V65--72 V65--72 V
Open circuit output
at 400 V
Power factor
(max current)
Efficiency
(max current)
Enclosure classIP 23IP 23IP 23IP 23
Application class
Weight160 kg195 kg260 kg295 kg
Dimens. lxwxh1310/765/7051310/765/7051310/765/7051310/765/705
300 W340 W615 W640 W
0,880,900,870,82
68 %74 %77 %78 %
8A/20V--400A/
36V
8A/20V--630A/
44(49)V
8A/20V--800A/
44(50)V
These welding power sources comply with the requirements of IEC 974--1 och
EN 60974--1.
The symbolindicates that the power source is designed for use in areas with an
increased electrical hazard. Equipment marked IP 23 is designed for indoor and
outdoor use.
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4INSTALLATION
WARNING
This product is intended for industrial use. In a domestic environment this
product may cause radio interference. It is the user’s responsibility to take
adequate precautions.
SInstallation must be carried out by a qualified electrician.
SCheck that the welding rectifier is configured for the available mains supply be-
fore connecting it to the mains.
SSee Connecting to mains for cable rating and fuse rating.
SConnect the mains cable to the rectifier according to the relevant regulations and
install a suitable fuse in the main fuse box.
SMake sure the welding rectifier is not covered or positioned so that cooling is ob-
SSet switch (1) to position ”I”. The white lamp (2) will light and the fan will start.
SSelect the welding method using the toggle switch (3).
SAdjust the welding current using the knob (7) on the front, and set the toggle
switch (8) to the position nearest the socket.
SSelect suitable earth and return cables and connect them to the terminals
marked + and -- on the front of the rectifier. Connect the return cable to the work
piece.
SThe rectifier is now ready for welding.
1.On/Off
2.White lamp (power on)
3.Method selector switch
4.Arc air gouging
5.MMA
6.TIG
7.Current setting
8.Remote switch
9.Remote socket
10. Yellow lamp (thermal cut--out)
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The yellow lamp comes on when the thermal cut--out trips.
When the rectifier has cooled down the thermal cut -- out is automatically reset.
6MAINTENANCE
LHF 250/400/630/800 normally do not require any maintenance.
Once a year blow the inside of the welding rectifier clean using dry compressed air at
reduced pressure.
Repeat more often if the rectifier is used in a very dusty or dirty environment.
6.1General
Note:
All warranty undertakings given by the supplier cease to apply if the customer
attempts to rectify any faults on the machine during the warranty period.
7ORDERING OF SPARE PARTS
A service manual and list of spare parts can be ordered through your nearest ESAB
representative, see the last page of this booklet.
When ordering spare parts please specify the machine model, serial number and the
designation and order numbers of parts as shown in the list of spare parts. This
simplifies dispatch and ensures correct delivery.
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