ESAB MIG C250i User manual

MIG C250i
Instruction manual
Welding Power Source

MIG C250i
Instruction manual
For
Installation, Operation & General maintenance

1
SAFETY
Precautions for installation
Beware of electric shock!
Install grounding device according to application standard.
Do not touch live parts with naked skin, wet gloves or wet clothes.
Be sure you are insulated from ground and work piece.
Cover the cover plate of the machine before power on to avoid an
electric shock.
Confirm the safety of your working position.
Beware of fire hazard!
Please install the machine on non-combustible materials to avoid
a fire.
Make ensure there are no inflammables near the welding position
to avoid a fire.
Beware of explosion!
Do not install the machine in an environment with explosive gas
to avoid an explosion.
Replacing the components can be dangerous.
Only professionals can replace the components of the machine.
Make sure the connecting wires inside the machine are correctly connected after replacing the
PCBs, and then the machine can be run. Otherwise, there is a risk of damage to property.
Make sure there are no foreign bodies such as wire leads, screws, gaskets and metal bars
falling into the machine inside when replacing the components.
Carrying or moving the machine can be dangerous.
Cut the input power off via the switching box before moving the welding machine.
The handle can only be used for moving the welding machine by hand in short distance, and
it cannot be used for lifting. Otherwise, personal injury or property damage may be caused by
a drop.
Make sure that the flying rings are tightened, and that the machine enclosure and cover are
fixed when moving the welding machine with a crane,
Two lifting belts should be used when lifting the welding machine, and the angle formed by the

2
lifting belt and the vertical should be smaller than 15°.
Do not apply any stress on the operation panel and cover when moving the welding machine.
Otherwise, personal injury or property damage may be caused by a drop.
Do not install and run the welding machine when the machine is damaged or lacks any
components. Otherwise, fire hazard or personal injury may be caused.
Precautions for operation
Smoke-may be harmful to your health!
Keep your head away from the smoke to avoid inhalation of waste
gas in welding.
Keep the working environment well ventilated with exhaust or
ventilation equipment when welding.
Arc radiation-may hurt your eyes and burn your skin!
Use proper welding mask and wear protective clothing to protect
your eyes and body.
Use proper mask or curtain to protect onlooker from being injured.
Magnetic field can make cardiac pacemaker a bit wonky.
People with cardiac pacemaker should consult the doctor before
carrying out welding.
Stay away from the welding source to reduce the effect of magnetic
field.
Improper use and operation may result in a fire or an explosion.
Welding spark may result in a fire, so please make ensure there are
no inflammables near the welding position, and pay attention to fire
safety.
Ensure there is fire extinguisher nearby, and make sure someone
has been trained to operate the fire extinguisher.
Do not weld closed container.
Do not use this machine for pipe thawing.
Hot work piece can cause severe scald.
Do not touch hot work piece with bare hands.
Cool the welding torch for a while after continuously working.
Excessive noise does great harm to people’s hearing.
Wear ear covers or other hearing protectors when welding.
Give warning to onlooker that noise may be potentially hazardous to
hearing.

3
Moving parts may injure your body.
Please keep away from moving parts (like fan).
Each door, panel, cover, baffle plate, and protective device the like
should be closed and located correctly.
Seek professional support when trouble strikes.
When trouble strikes in installation and operation, please inspect
according to related contents in this manual.
If you still cannot understand fully, or you still cannot solve the
problem, please contact the service center to obtain professional
support.

4
TABLE OF CONTENTS
1. SAFETY....................................................................................................1-3
Technical parameters ..............................................................................5
2. INSTALLATION AND CONNECTION ..........................................................2
Installation requirements............................................................................
Electrical connection..................................................................................
3. OPERATION.............................................................................................7-9
Panel functions of MIG C250i ..................................................................
Operation of the panel functions................................................................
Input Power Supply ...................................................................................
Wire Feeding Mechanism..........................................................................
Work after welding.....................................................................................
4. MAINTENANCE .....................................................................................9-11
Daily maintenance.....................................................................................
Periodic check...........................................................................................
5. TROUBLESHOOTING..........................................................................12-13
6. WIRING DIAGRAM....................................................................................14
7. SPARES LISTAND EXPLODED DIAGRAM ........................................15-17

5
Technical Parameters of MIG C250i
Description
Specification
Model
MIG C250i
Input Voltage V
1Phase 220V
3Phase 415V
Frequency Hz
50/60
Rated input current A
45
14.8
Rated KVA
10.3
10.8
MMA welding current A
20A~200A
MIG welding current A
30A~250A
Welding current（10min）A
60%@250
Efficiency η
85%
Power factor Cosφ
0.9
Insulation class
F
Enclosure protection IP
21S
Cooling type
Fan cooled
Weight Kg
53
Dimension L×W×H mm
1000*490*730
The MIG C250i series is a DC inverter compact MIG welding machine with MMA
function. This unit uses 1~Phase 220V, 50/60Hz or 3~Phase 415V, 50/60Hz input AC
power.

6
INSTALLATION AND CONNECTION
Installation requirements
1) Environment requirements
a) Do not install the machine at places with excessive dusts and metal powders.
b) Do not install the machine at places with corrosive or explosive gas.
c) The temperature of the working environment should be between -10℃and 40℃.
d) Do not carry out welding with the welding machine placed on a platform with a pitch
greater than 15°.
e) The machine should be installed in a well-ventilated place with humidity of 90% or
less and without water condense.
f) Pay attention to the wind at the welding site, and use wind deflector if necessary.
Otherwise, the welding process will be affected.
2) Installation space requirements
The welding machine should be at least 20cm away from the walls, and there
should be at least 30cm between them when two machines are installed side by side.
Please refer to the table below to determine the installation position of the welding
machine. Table 2-1: Reserved space when installing the welding machine
Machine part
Front
Top
Left
Right
Rear
Reserved space
≥20cm
≥10cm
≥20cm
≥20cm
≥20cm
Electrical connection
•High voltage danger from power source! Consult a qualified electrician for proper
installation of receptacle. This welder must be grounded while in use to protect the
operator from electrical shock.
• Do not remove grounding connection or alter the plug in any way. Do not use any
adapters between the welder’s power cord and the power source receptacle. Make
sure the POWER switch is OFF when connecting your welder’s power cord to a
properly grounded input AC supply.

7
OPERATION
Panel Functions of MIG C250i
Serial
No.
Part name
Function
1
Current meter display
To display the welding current value.
2
Voltage meter display
To display the welding voltage value.
3
Wire Inching switch
To feed wire without welding.
4
2 / 4 Stroke
2 or 4 stroke operation in MIG.
5
Welding Process Selection
MIG or MMA Selection.
6
Voltage Control
Voltage adjustment in MIG
7
Current Control
Wire Speed/ Current Control in MIG/ MMA.
8
Positive Output
Positive Output Terminal
9
Output Selection
MIG Polarity Change Cable
10
Negative Output
Negative Output Terminal
11
Torch Connector
Euro type MIG Torch Connection
12
LEDS
Power On / Over Heating
13
Inductance Control
Inductance Adjustment in MIG mode

8
Rear panel
Input Power Supply
This unit uses 1~Phase 220V, 50/60Hz or 3~Phase 415V, 50/60Hz input AC power.
3 Phase supply connection:
Connect 3 Phase 415V, 50Hz input power supply (R, Y, B and Ground) to the
corresponding R, Y, B and ground wires of the power source.
1 Phase Supply connection:
Connect 1 phase 220V, 50Hz input power supply to “RED” and “BLACK” wires and
ground wire of the power source.
Wire Feeding Mechanism
Wire Feeding mechanism is inbuilt inside
the machine. Wire Spool mounting and
feed roller assembly both are available
on the right side of the machine.
Work after welding
1) Cut off the power of the welding machine 3~5min after the welding work is finished,
so as to cool the internal of the machine.
2) Turn off the air switch on the welding machine first and then switch off the power
in the switching box when shutting off the power.