Power Inverter 250/315
Svetslikriktare Welding rectifiers Schweißgleichrichter Redresseurs de soudage
Bruksanvisning och reservdelsförteckning Instruction manual and spare parts list Betriebsanweisung und Ersatzteilverzeichnis Manuel d'instructions et liste des pièces détachées
Innehållsförteckning
| Presentation | ٦ |
|---|---|
| Fjärregleringsdon | 1 |
| Installation | 2 |
| Drift | 2 |
| Skötsel och service | 3 |
| Reservdelsbeställning | 3 |
| Tekniska data | 4 |
| Statisk karakteristik | 17 |
| Verkningsgrad och effektfaktor | 19 |
| Måttskiss | 20 |
| Förbindningsschema 21-2 | 22 |
| Reservdelsförteckning | 25 |
List of contents
| Presentation | 5 |
|---|---|
| Remote control units | 5 |
| Installation | 6 |
| Operation | 6 |
| Maintenance and service | 7 |
| Ordering spare parts | 7 |
| Technical data | 8 |
| Static characteristics | 17 |
| Efficiency and power factor | 19 |
| Dimensions | 20 |
| Wiring diagram 21- | -22 |
| Spare parts list | 25 |
Inhaltsverzeichnis
| 9 |
|---|
| 9 |
| 10 |
| 10 |
| 11 |
| 11 |
| 12 |
| 17 |
| 19 |
| 20 |
| 22 |
| 25 |
Sommaire
| Présentation | 13 |
|---|---|
| Commande à distance | 13 |
| Installation | 14 |
| Utilisation | 14 |
| Entretien et dépannage | 15 |
| Commande de pièces détachées | 15 |
| Caractéristiques techniques | 16 |
| Caractéristiques externes statiques | 17 |
| Rendement et facteur de puissance | 19 |
| Dimensions | 20 |
| Schéma électrique 21- | -22 |
| Liste des pièces détachées | 25 |
Instruction for use
Presentation
The ESAB LHL 250 and LHL 315 are a series of power inverters intended for covered rod and TIG welding.
Advanced electronics give features which include fast control and response, low energy consumption and superb welding characteristics.
Through utilization of inverter technology, the machines are lightweight and small in size.
The rating plate with serial number and connecting data is mounted on the back panel of the power source.
The LHL inverters are supplied with two cable connectors of the snapaction type.
A handy trolley
An optional extra for the LHL power inverters is a compact and sturdy trolley with folding handles. (Order no. 367 450-880)
Manual welding
The power invertes of the LHL series possess dynamic characteristics which give a calm and spatterfree arc and an easily controlled weld pool.
A high open circuit voltage and a well balanced power boost when striking the rod gives reliable starting and restriking. The LHL's anti-stick function considerably reduces the risk of the rod fastening to the workpiece. Should, despite this, the rod stick, the welding current is automatically sloped down which means the rod can be loosened without damage and restriking can take place immediately.
This function facilitates welding, particularly in root runs, and also saves the electrode.
TIG welding
The LHL 250 and LHL 315 are also very good machines for TIG welding. Thanks to the very low minimum current, (only 5 and 8 A resp.) very thin materials can be TIG welded with the LHL power inverters.
With a TIGAID add-on unit, the LHL makes up an advanced TIG unit with features which include slope-up and down, current pulsing, pilot arc and gas automatics. Argon gas, regulator and TIG torch are required for TIG-welding. Most materials can be TIG-welded with direct current. There are a few exceptions, however, including aluminium and magnesium.
Remote control units
Remote control unit PHA 1
A simple remote control unit which gives stepless control of the welding current by means of a single knob. A 10 or 25 metre cable is included. (Order no. 10 m 367 657-881) (Order no. 25 m 367 657-880)
Remote control unit PHB 1
A light and very versatile one-hand unit equipped with a planet gear for accurate settings. (Order no. 367 317-880)
Remote control unit PHB 2
Strongly built, the PHB 2 has both coarse and fine setting potentiometers for accurate adjustment. (Order no. 367 318-880)
Remote control unit PHC 2
A strongly built remote control unit with a ten-stage coarse setting range. Fine adjustments are made steplessly within each of the coarse ranges. (Order no. 367 620-880)
Long pulse unit PHA 5
When there is a need of pulsing current for TIG welding or when welding stainless steel, the PHA 5 is the answer. Current pulses can be set between 0.03 and 2 or 4 seconds. The pulsing current is infinitely variable between the LHL inverter's mini and maxi current settings. A "continuous current" selector is switched over to enable the PHA 5 to be used as a remote control unit. (Order no. 367 970-880)
Hot start unit PHA 2
Combining the LHL rectifiers with the PHA 2 hot start unit means that a choice of two entirely independent current levels is provided. The selector switch for these two levels is mounted on the electrode holder. Hot starting is used, for example, after changing rods in single-sided welding with root backing plate. A higher current can then be used which melts away any imperfections (pipes and craters/cracks), which normally occur when welding is interrupted.
The two current levels can be set individually. (Order no. 367 601-880)
Connection and extension cables
for the PHB1, PHB2, PHC2, PHA5 and PHA2.10 metre connection cableorder no. 367 144-88225 metre connection cableorder no. 367 144-88325 metre extension cableorder no. 367 662-880
Installation
The LHL 250/315 is delivered as a 380 V three phase (50/60 Hz) mains supply version.
The LHL 315 is also available as a reconnectable version for 208–230 V/415–460 V three phase (50/60 Hz) supplies.
- 1. Ensure that the welding rectifier is connected to the required mains supply.
- 2. The mains cable area and fuse size are listed in the table below.
- 3. The mains cable is connected to the block K11, marked R, S and T. The block is on the back of the machine, bottom right. The cable passthrough and off-loading clamp are also on the back of the machine, bottom right.
- 4. Protective earthing should be according to valid regulations. Protective earthing can be connected to the bolt which is marked under the connecting block.
- 5. The welding cable and earth return should have a cable area of 25 mm2 for LHL 250 and 35 mm2 for the LHL 315.
In order to reduce the voltage drop when extra-long welding cables are being used, it may be necessary to choose a heavier dimension of cable. Make sure that all cables are properly connected to the cable connectors, the electrode holder and the earth return clamp.
Operation
All controls of the LHL inverters are mounted on the front panel.
- Knob for adjustment of welding current
- Mains current switch
- Yellow pilot lamp showing when the inverter is alive
- Red lamp which warns of overloading
- Toggle switch for selection of durrent setting from front panel or from remote control unit.
- Output for F-remote control unit.
- Welding current terminals for welding cable and earth return cable.
Welding
- 1. Set current selector to position "I". The yellow pilot lamp will light up and the fan will start.
- 2. Make sure that there is an ample through-flow of cooling air.
- 3. Set the toggle switch for the current setting with or without remote control unit.
- 4. If the remote control unit is to be used, connect it to the remote control unit output.
- 5. Select the required welding current by means of the knob on the front panel or on the remote control unit if it is being used.
- 6. Make sure that the cable connectors for the welding and earth return cables are properly connected to the welding rectifier.
- 7. The LHL is now ready for welding.
Technical description
The heaviest component in a conventional welding rectifier is the transformer which reduces the incoming primary voltage to a voltage which is more suitable for welding.
By increasing the frequency of the primary current, the weight of the transformer can be significantly reduced. This possibility has been utilized in the LHL power inverters.
By applying the inverter technique, which means that the current used inside the actual power source has a frequency which is many times higher than the mains frequency, it has been possible to reduce the weight of a number of major components to an equivalent degree. A number of other benefits are gained at the same time, including a higher coefficient of efficiency and better control of the welding process.
This is how the LHL inverter works: The incoming three-phase alternating current is rectified to direct current. It is then converted back to alternating current by means of an inverted rectifier and comes out at a much higher frequency than the mains voltage input. The current is then changed back again to direct current which is suitable for welding. The entire process is monitored by a control circuit which gives the power source the desired static characteristics and dynamic properties.
The LHL consists of a power unit and a control unit. The power unit is fan cooled and comprises two parallelconnected power packages, the main transformer, the rectifier bridge, inductor, basic current circuit, cooling fans and connecting blocks for the mains supply and main circuit breaker. The control unit is in a dust-tight and fully separate compartment on the side of the ventilated power unit. It incorporates a potentiometer for current settings, a remote control output with switch, the control electronics, a control transformer, contactor and warning lamps.
Overheating protection
The LHL power inverter has two dust and moistureproof thermal watchdogs, connected in series, which protect the equipment against overheating caused by overloading or insufficient cooling air.
The watchdogs are mounted on the secondary side of the diode bodies (downstream of the welding diodes, in the direction of the air flow). Should the watchdogs be triggered by overheating, they will automatically reset when the unit has cooled down.
Cooling fan
Two very quiet-running axial fans provide the necessary flow of cooling air for the power inverters. The fans are installed close to the rear panel, in a track between the guides. Air is sucked in through the gills on the front of the machine. The fans have single-phase, moisture-protected splitpole motors.
Permissible ambient temperature 50-55°C.
Transient protection
The LHL power inverters are equipped with a separate guard circuit which protects the electronics of the machines against all normal forms of mains transient effects (caused by lightning, power failures, etc.).
Machine casing
The front, walls, shroud and hatch of the machine are made of heavy-duty alu-zinc treated sheet steel with an enamelled finish. The bottom plate is galvanized. The shroud and hatch can be easily removed for good accessibility during servicing and inspection of the inner components of the inverter.
Maintenance and service
In normal use, the LHL power inverters require no maintenance. Blowing the machine clean once per year with a clean and dry supply of compressed air at reduced pressure is adequate. In dusty and contaminated atmospheres, the cleaning operation should be carried out more frequently.
Changing transistors
Considerable care should be taken when replacing and handling transistors. Special equipment should be used to protect the transistors against static electricity.
Changing the circuit board
The circuit board is changed by disconnecting the contact unit for the gate and source cables K 45.2, K 45.3 and all other contacts mounted on the right-hand side of the board. Push in the tongues of the circuit board holders and remove the board. The new board is pushed into position and all contacts are remade.
NOTE!
It is essential that all contacts are connected in the correct manner and in their original places.
Ordering spare parts
Spare parts can be ordered through your local ESAB dealer or representative. For a list of addresses, see the last page of this publication.
When ordering, always specify the type of machine (LHL 250 or LHL 315), the machine serial number and the names and part numbers required in accordance with the list of parts. This will facilitate the serving of your order and ensure that you will get the correct parts.
| lecimical data | 111 215 (000.) | ||
|---|---|---|---|
| Pormissible load | LHL 250 | LHL 315 (380 V) | LHL 315 (220 V) |
| at 35% duty cycle | 250 A/30 V | 315 A/33 V | 315 A/33 V |
| 200 A/28 V | 250 A/30 V | 250 A/30 V | |
| 160 A/26 V | 180 A/27 V | 180 A/27 V | |
| 100 7/20 1 | 100 7021 1 | ||
| Setting range | 5–250 A | 8–315 A | 8–315 A |
| Onen eizevit veltege | CE V | 65 V | 65 V |
| Open-circuit voltage | 05 V | 05 V | 00 V |
| Mains supply | 3×380 V, 50/60 Hz | 3×380 V, 50/60 Hz | 3×208–230 V, 50/60 Hz |
| Fuse | 10 A | 16 A | 208–230 V – 32 A |
| Primany apple (mm 2 ) | 4×15 | 208 220 V AXA | |
| 4~1.5 | 4~1.5 | 200-230 V - 4/4 | |
| Mains voltage compensation | +/- 10% | +/- 10% | +/- 10% |
| No load power | 90 W | 90 W | 90 W |
| Power factor ()) at 150 A | 0.94 | 0.94 | 0 04 |
| Fower lactor (/) at 150 A | 0.94 | 0.94 | 0.94 |
| at max A | 0.94 | 0.94 | 0.94 |
| Efficiency (n) at 150 A | 0.84 | 0.85 | 0.85 |
| Weight | 27 kg | 28 kg | 28 kg |
| Weight | 27 Ng | 20 Kg | 20 Ng |
| Temperature class | F (155°C) | F (155°C) | F (155°C) |
| Design criteria | IP 23 | IP 23 | IP 23 |
| Application classification | K | Κ | К |
| Norms | SEN 8301 | SEN 8301 | SEN 8301 |
| ISO 700 | ISO 700 | ISO 700 | |
| VDE 0542 | VDE 0542 | VDE 0542 | |
| NF A 85 011 | NF A 85 011 | NF A 85 011 | |
Technical data
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