Long-run 250LD2 User manual

INVERTER DC STICK WELDER
250LD2, 300LD2
OPERATION MANUAL
DO NOT INSTALL, OPERATE OR MAINTAIN THIS MACHINE WITHOUT READING THIS MANUAL AND
PLEASE ALWAYS THINK BEFORE YOU ACT.
www.worldwel.com
MODEL UNIT 250LD2 300LD2
INPUT VOLTAGE V 220, Single phase
FREQUENCY Hz 50/60
INPUT CAPACITY KVA 9 11
NO LOAD VOLTAGE V 80 82
CURRENT RANGE A 20~250 20~300
VOLTAGE RANGE V 27 29
DUTY CYCLE % 60
WEIGHT kg 15 16.5
DIMENSION
(W×D×H) mm 210x460x300

General Safe Practices
Wear approved safety glasses with side shields under your welding helmet or face shield and at all times in■
the work area.
When working above floor level, use a safety belt to protect yourself from a fall should you get a shock.■
Do not install or place machine on or over combustible surfaces.■
Be sure that all installation, operation, maintenance and repair procedures are performed only by qualified■
persons.
Electric shock can kill.
Wear Dry, hole-free insulating gloves and body protection. Do not touch electrode with bare hand. Do not■
wear wet or damaged gloves.
Do not touch live electrical parts.■
Never dip the electrode in water for cooling.■
Properly install and ground all equipment.■
Protect yourself from electric shock by insulating yourself from work and ground.■
Use non-flammable, dry insulating material if possible, or use dry rubber mats, dry wood or plywood, or
other dry insulating material big enough to cover your full area of contact with the work or ground, and
watch for fire.
Turn off input power using the disconnect switch at the fuse box before working on the equipment.■
Frequently inspect input power cord for damage or bare wiring and repair or replace cord immediately if■
damaged.
Fumes and gases can be dangerous.
Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.■
When welding, keep your head out of thefume. Use enough ventilation and/or exhaust at the arc to keep
fumes and gases away from the breathing zone.
Use enough forced ventilation or local exhaust (forced suction) at the arc to remove the fumes from your■
breathing area.
Use a ventilating fan to remove the fumes from the breathing zone and welding area.■
Arc rays can burn eyes and skin.
Use welding helmet with correct shade of filter to protect your eyes from sparks and the rays of the arc.■
Wear welders cap and safety glasses with side shields. Use ear protection when welding out of position or■
in confined spaces. Button shirt collar.
Wear complete body protection. Wear oil-free protective clothing such as leather gloves, heavy shirt,■
cuffless pants and high boots.

Welding sparks can cause fire or explosion.
Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding■
sparks from starting a fire. Remember that welding sparks and hot materials from welding can easily go
through small cracks and opening to adjacent areas. Avoid welding near hydraulic lines.
When not welding, make certain no part of the electrode circuit is touching the work or ground. Accidental■
contact can cause overheating and create a fire hazard.
Do not weld on drums, tanks, or any closed containers unless a qualified person has tested it and declared■
it or prepared it to be safe.
Connect the work cable to the work as close to the welding area as practical. Work cables connected to the■
building framework or other locations away from the welding area increase the possibility of the welding
current passing through lifting chains, crane cables or other alternate circuits. This can create fire hazards
or overheat lifting chains or cables until they fail.
INSTALLATION■
The welding machine shall be installed at a place ;●
free from the inflammables․
less humidity, dirt and dust․
protecting from influence of direct sunlight, wind and rain․
not generated oil vapor and corrosive gas․
operating temperature range is from -10 to 40℃ ℃․
least 30 away from wall and other welding machine㎝․
Input Connection (Rear of the machine)●
Be Sure the voltage, phase and frequency of the input power is as specified on the name plate
located on the rear panel of the machine.
To connect the power cables, turn the power switch "OFF"․
Verify the voltage to be supplied from main power.․
Open the cover of terminal and connect the power cable to the power input terminal on the rear of․
the machine and close the cover of terminal. For grounding the machine, connect a ground wire to
the ground terminal marked with the symbol is located on the rear panel of the machine.
In case of the 160LD, 180LD and 200LD to be supplied with input cord, please plug in a input power․
cord into a receptacle that is grounded.
Output Connection (Front of the machine)●
Connect the electrode cable (which is connected to the electrode holder) to the "HOLDER (+)"․
terminal.
Connect the work cable (which is connected to the work clamp) to the "METAL (-)" terminal.․

CONNECTION●
FRONT CONTROL PANEL●
POWER LAMP①
WARNING LAMP②
VOLTAGE REDUCING DEVICE LAMP③
④ VOLTAGE REDUCING DEVICE SWITCH
AMMETER (DIGITAL DISPLAY)⑤
OUTPUT CURRENT CONTROL⑥

250LD2 PARTS LIST
*Description can be changed by LOT number
NO. PART NAME DESCRIPTION QTY.
1 MainPCB WAM-02 1
2 Condensor 2700/400V 1
3 NFB 2P-80A 1
4 Control Transformer 5725 1
5 Temp. Switch N85 1
6 IGBT 600V,100A 2
7 IGBT Drive PCB WGE-01 2
8 Input Bridge Diode/PCB SDH100B-16 1
9 Output Diode PCB WDO-10 1
10 Output Terminal MJ-133 2
11 Choke Transformer 200LD2 1
12 Main Transformer 200LD2 1
13 FAN 150T 1
14 MF Condensor 10 /800V[SMALL]㎌ 2
15 Input Terminal 6MM 1
16 TNR 14D391 1
17 FUSE 3A 1

300LD2 PARTS LIST
*Description can be changed by LOT number
NO. PART NAME DESCRIPTION QTY.
1 Main PCB WAM-02 1
2 Condensor 3300/400V 1
3 NFB 2P-80A 1
4 Control Transformer 5725 1
5 Temp. Switch N85 1
6 IGBT 600V,150A 2
7 IGBT Drive PCB WGE-01 2
8 Input Bridge Diode/PCB SDH100B-16 1
9 Output Diode PCB WDO-06 2
10 Output Terminal MJ-133 2
11 Choke Transformer 300LD2 1
12 Main Transformer 300LD2 1
13 FAN 150T 1
14 MF Condensor 10 /800V[SMALL]㎌ 2
15 Input Terminal 6MM 1
16 TNR 14D391 1
17 FUSE 3A 1

300LD2 (220/440V) PARTS LIST
*Description can be changed by LOT number
NO. PART NAME DESCRIPTION QTY.
1 Main PCB WAM-02 1
2 Condensor 2200/400V 2
3 NFB 3P-80A 1
4 Control Transformer 7630 1
5 Temp. Switch N85 1
6 IGBT LUH150G602Z 2
7 IGBT Drive PCB WGE-01 2
8 Input Bridge Diode/PCB DF75LA80 1
9 Output Diode PCB WDO-06 2
10 Output Terminal MJ-133 2
11 Choke Transformer 300LD2 1
12 Main Transformer 300LD2 1
13 FAN YY FAN 1
14 MF Condensor 10 /800V[SMALL]㎌ 2
15 Input Terminal 6MM 1
16 TNR 14D391 1
17 FUSE 3A 1
18 MF Condensor 10 /1000V㎌4
19 Terminal 30A4P 1

Thanks for purchasing our machine
Please fill out below form for future reference. This information can be found on the
Nameplate of your machine.
Product Name INVERTER DC STICK WELDER
Model Number
Date Manufactured
Serial Number
Date Purchased
Where Purchased
Where you use
Whenever you request replacement parts or information on this machine, always supply the
information you have recorded above. The date number is especially important when
identifying the correct replacement parts.
Complete this form, please fax it to our selling agency in your country or us for warranty
statement.
WORLDWEL CO., LTD.
11-101, Songlim-dong, Dong-gu, Incheon-city, Korea
TEL : [phone] FAX : [phone]
E-mail : [e-mail]
www.worldwel.com