Lincoln Electric LF 33S User manual

IM3019
05/2021
REV03
LF 33S
OPERATOR’S MANUAL
ENGLISH
Lincoln Electric Bester Sp. z o.o.
ul. Jana III Sobieskiego 19A, 58-260 Bielawa, Poland
www.lincolnelectric.eu

English I English
12/05
THANK YOU! For choosing the QUALITY of the Lincoln Electric products.
Please check packaging and equipment for damage. Claims for material damaged in shipment must be notified
immediately to the dealer.
For ease of use, please enter your product identification data in the table below. Model Name, Code & Serial Number
can be found on the machine rating plate.
Model Name:
………………...…………………………….…………………………………………………………………………………………..
Code & Serial number:
………………….……………………………………………….. …………………………………………………….……………..
Date & Where Purchased:
…………………………………………………………………... ……………………….…………………………………………..
ENGLISH INDEX
Technical Specifications...................................................................................................................................................... 1
Electromagnetic Compatibility (EMC).................................................................................................................................. 2
Safety.................................................................................................................................................................................. 3
Installation and Operator Instructions.................................................................................................................................. 5
WEEE ............................................................................................................................................................................... 10
Spare Parts ....................................................................................................................................................................... 10
REACh .............................................................................................................................................................................. 10
Authorized Service Shops Location .................................................................................................................................. 10
Electrical Schematic.......................................................................................................................................................... 10
Accessories....................................................................................................................................................................... 11
Connection configuration................................................................................................................................................... 12

English 1 English
Technical Specifications
NAME INDEX
LF 33S K14051-1
INPUT VOLTAGE WIRE FEED SPEED
34-44 Vac 1.0-20 m/min
RATED OUTPUT AT 40°C
Duty Cycle 40°C (based on a 10 min. period) Output Current
100% 385 A
60% 500 A
OUTPUT RANGE
Welding Current Range Maximum Open Circuit Voltage
20-500 A 113 Vdc or Vac peak
WIRE SIZES (mm)
Solid wires Cored wires Aluminium wires
0.6 to 1.6 1.2 to 2.4 1.0 to 1.6
PHYSICAL DIMENSIONS
Height Width Length Weight
350 mm 195 mm 530 mm 12 Kg
OTHERS
Protection Rating Maximum Gas Pressure
IP23 0,5 MPa (5 bar)
Operating Temperature Storage Temperature
from -10°C to +40°C from -25°C to 55°C

English 2 English
Electromagnetic Compatibility (EMC)
01/11
This machine has been designed in accordance with all relevant directives and standards. However, it may still generate
electromagnetic disturbances that can affect other systems like telecommunications (telephone, radio, and television) or
other safety systems. These disturbances can cause safety problems in the affected systems. Read and understand this
section to eliminate or reduce the amount of electromagnetic disturbance generated by this machine.
This machine has been designed to operate in an industrial area. To operate in a domestic area it is necessary
to observe particular precautions to eliminate possible electromagnetic disturbances. The operator must install
and operate this equipment as described in this manual. If any electromagnetic disturbances are detected the
operator must put in place corrective actions to eliminate these disturbances, if necessary with assistance from
Lincoln Electric.
Before installing the machine, the operator must check the work area for any devices that may malfunction because of
electromagnetic disturbances. Consider the following.
Input and output cables, control cables, and telephone cables that are in or adjacent to the work area and the machine.
Radio and/or television transmitters and receivers. Computers or computer controlled equipment.
Safety and control equipment for industrial processes. Equipment for calibration and measurement.
Personal medical devices like pacemakers and hearing aids.
Check the electromagnetic immunity for equipment operating in or near the work area. The operator must be sure that
all equipment in the area is compatible. This may require additional protection measures.
The dimensions of the work area to consider will depend on the construction of the area and other activities that are
taking place.
Consider the following guidelines to reduce electromagnetic emissions from the machine.
Connect the machine to the input supply according to this manual. If disturbances occur if may be necessary to take
additional precautions such as filtering the input supply.
The output cables should be as short as possible and positioned together as close as possible to each other. If possible
connect the work piece to ground in order to reduce the electromagnetic emissions. The operator must check that
connecting the work piece to ground does not cause problems or unsafe operating conditions for personnel and
equipment.
Shielding of cables in the work area can reduce electromagnetic emissions. This may be necessary for special
applications.
WARNING
EMC classification of this product is class A in accordance with electromagnetic compatibility standard EN 60974-10 which
means that the product is designed to be used in an industrial environment only.
WARNING
The 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 in those locations,
due to conducted as well as radiated disturbances.

English 3 English
Safety
01/11
WARNING
This equipment have to be used by qualified personnel. Be sure that all installation, operation, maintenance and repair
procedures are performed only by qualified person. Read and understand this manual before operating this equipment.
Failure to follow the instructions in this manual could cause serious personal injury, loss of life, or equipment damage. Read
and understand the following explanations of the warning symbols. Lincoln Electric is not responsible for damages caused
by improper installation, improper care or abnormal operation.
WARNING: This symbol indicates that instructions must be followed to avoid serious personal injury, loss
of life, or equipment damage. Protect yourself and others from possible serious injury or death.
READ AND UNDERSTAND INSTRUCTIONS: Read and understand this manual before operating this
equipment. Arc welding can be hazardous. Failure to follow the instructions in this manual could cause
serious personal injury, loss of life, or equipment damage.
ELECTRIC SHOCK CAN KILL: Welding equipment generates high voltages. Do not touch the electrode,
work clamp, or connected work pieces when this equipment is turned on. Insulate yourself from the
electrode, work clamp, and connected work pieces.
ELECTRICALLY POWERED EQUIPMENT: Turn off the input power using the disconnect switch at the
fuse box before working on this equipment. Ground this equipment in accordance with local electrical
regulations.
ELECTRICALLY POWERED EQUIPMENT: Regularly inspect the input, electrode, and work clamp
cables. If any insulation damage exists replace the cable immediately. Do not place the electrode holder
directly on the welding table or any other surface in contact with the work clamp to avoid the risk of
accidental arc ignition.
ELECTROMAGNETIC FIELD MAY BE DANGEROUS: Electric current flowing through any conductor
creates electromagnetic field (EMF). EMF fields may interfere with some pacemakers, and welders having
a pacemaker shall consult their physician before operating this equipment.
CE COMPLIANCE: This equipment complies with the European Community Directives.
ARTIFICIAL OPTICAL RADIATION: According with the requirements in 2006/25/EC Directive and
EN 12198 Standard, the equipment is a category 2. It makes mandatory the adoption of Personal
Protective Equipment (PPE) having filter with a protection degree up to a maximum of 15, as required by
EN169 Standard.
FUMES AND GASES CAN BE DANGEROUS: Welding may produce fumes and gases hazardous to
health. Avoid breathing these fumes and gases. To avoid these dangers the operator must use enough
ventilation or exhaust to keep fumes and gases away from the breathing zone.
ARC RAYS CAN BURN: Use a shield with the proper filter and cover plates to protect your eyes from
sparks and the rays of the arc when welding or observing. To protect the skin, use suitable clothing made
of durable, fireproof material. Protect other nearby personnel with suitable, non-flammable screening and
warn them not to watch the arc nor expose themselves to the arc.

English 4 English
WELDING SPARKS CAN CAUSE FIRE OR EXPLOSION: Remove fire hazards from the welding area
and have a fire extinguisher easily accessible. Welding sparks and hot materials from the welding process
can easily go through small cracks and openings to adjacent areas. Do not weld on any tanks, drums,
containers, or material until the proper steps have been taken to insure that no flammable or toxic vapors
will be present. Never use this equipment when flammable gases, vapors or flammable liquids are
present.
WELDED MATERIALS CAN BURN: Welding generates a large amount of heat. Hot surfaces and
materials in work area can cause serious burns. Use gloves and pliers when touching or moving
materials in the work area.
CYLINDER MAY EXPLODE IF DAMAGED: Use only certificate, compressed gas cylinders containing
the correct shielding gas for the process used and properly operating regulators designed for the gas and
pressure used. Always keep cylinders in an upright position securely chained to a fixed support. Do not
move or transport gas cylinders with the protection cap removed. Do not allow the electrode, electrode
holder, work clamp or any other electrically live part to touch a gas cylinder. Gas cylinders must be
located away from areas where they may be subjected to physical damage or the welding process
including sparks and heat sources.
MOVING PARTS ARE DANGEROUS: There are moving mechanical parts in this machine, which can
cause serious injury. Keep your hands, body and clothing away from those parts during machine starting,
operating and servicing.
SAFETY MARK: This equipment is suitable for supplying power for welding operations carried out in an
environment with increased risk of electric shock.
The manufacturer reserves the right to make changes and/or improvements in design without upgrade at the same time the
operator’s manual.

English 5 English
Installation and Operator Instructions
Read this entire section before installation or operating the
machine.
Exploitation conditions
This machine can operate in harsh environments.
However, it is important to use the following simple
preventive measures that will ensure its long life and
reliable operation:
Do not place or operate this machine on a surface with
an incline higher than 15° from horizontal.
Do not use this machine for pipe thawing.
This machine must be located where there is free
circulation of clean air without restrictions for air
movement. Do not cover the machine with paper, cloth
or rags when switched on.
Dirt and dust that can be drawn into the machine
should be kept away from the item.
This machine has a protection rating of IP23. Keep it
dry when possible and do not place it on a wet ground
or in puddles.
Locate the machine away from a radio controlled
machinery. Normal operation may adversely affect the
operation of a nearby radio controlled machinery,
which may result in injury or equipment damage. Read
the section on electromagnetic compatibility in this
manual.
Do not operate in areas with an ambient temperature
greater than 40°C.
Duty cycle and Overheating
The duty cycle of a welding machine is the percentage of
time in a 10 minute cycle at which the welder can operate
the machine at rated welding current.
Example: 60% duty cycle:
Welding for 6 minutes. Break for 4 minutes.
Excessive extension of the duty cycle will cause the
thermal protection circuit to activate.
Minutes or decrease
Duty Cycle
Input Supply Connection
Check the input voltage, phase, and frequency of the
power source that will be connected to this wire feeder.
The allowable input voltage of the power source is
indicated on the rating plate of the wire feeder. Verify the
connection of grounding wires from the power source to
the input source.
Controls and Operational Features
7
2
4
9
5
1
3
8
6
1. EURO Socket: or connecting welding torch.
2. WFS (Wire Feed Speed) Control Knob: It enables
continuous control of wire feeding speed in the range
from 1.0 to 20m/min.
WARNING
Before welding beginning and during Cold Inch Switch
using the Pro-welding Wire Speed Control Knob [16]
has also an influence on the wire feeding speed.
3. Output Voltage Control Knob: It enables continuous
control of welding voltage.
4. Local/Remote Switch: It changes the control of the
Output Voltage from the wire feeder Output Control
[3] to Remote Control Unit and vice versa.
5. Remote Control Receptacle: If a remote
control is used, it will be connected to the
remote receptacle (see Accessories for
ordering the desired unit).
6. Quick Connect Couplings (For water cooled model
only): For connecting water cooled torches.
Warm water from torch.
Cool water to torch.
7. Digital Display A: It shows the actual welding current
value (in A), and after finishing welding process, it
shows the average value of the welding current.
8. Digital Display V: It shows the actual value of
welding voltage (in V), and after finishing welding
process, it shows the average value of welding
voltage.
9. Fast-Mate Adapter: For connecting electrode touch.

English 6 English
10
13
12
11
10. Quick Connect Couplings: If water cooled torches are
used, connect water lines from water cooler here.
Refer to torch and water cooler guidelines for
recommended cooling liquid and flow rates.
11. Fast-Mate Adapter: Input power connection.
12. Gas Connector: Connection for gas line.
13. Amphenol Connection: 8-Pin connection to power
source.
19 20
16 171514 18
19 20
16 171514 18
14. Torch Mode Switch: It enables selection of 2-step or
4-step torch mode. The functionality of 2T/4T mode is
shown in the picture below:
↑Trigger pressed
↓Trigger released
A. Welding Current.
B. Burnback time.
C. WFS.
G. Gas.
15. Cold Inch / Gas Purge Switch: This switch enables
wire feeding or gas flow without turning on output
voltage.
16. Pre-welding wire speed control knob: Enables
change of the wire feed speed before starting
welding process in a range from 1,0 [m/min] to the
value which was set by WFS knob [2].
17. Burnback Time Control Knob: It enables to obtain
the desired length of electrode wire, which protrudes
from the tip of the torch after ending welding;
adjusting range from 20 to 320ms.
18. Gas Flow Regulator: Regulate flow between 0-25
LPM (liter/min.).
19. Wire Drive: 4-Roll wire drive compatible with 37mm
drive rolls.
20. Wire Spool Support: Maximum 5kg spools.
Accepts plastic, steel and fiber spools onto 51mm
spindle.
WARNING
The Linc Feed wire feeders must be used with the door
completely closed during welding.
Loading the Electrode Wire
Open the side cover of the machine.
Unscrew the fastening cap of the sleeve.
Load the spool with the wire on the sleeve such that the
spool turns clockwise when the wire is fed into the wire
feeder.
Make sure that the spool locating pin goes into the fitting
hole on the spool.
Screw in the fastening cap of the sleeve.
Put on the wire roll using the correct groove
corresponding to the wire diameter.
Free the end of the wire and cut off the bent end making
sure it has no burr.
WARNING
Sharp end of the wire can hurt.
Rotate the wire spool clockwise and thread the end of the
wire into the wire feeder as far as the Euro socket.
Adjust force of pressure roll of the wire feeder properly.

English 7 English
Adjustments of Brake Torque of Sleeve
To avoid spontaneous unrolling of the welding wire the
sleeve is fitted with a brake.
Adjustment is carried by rotation of its screw M8, which is
placed inside of the sleeve frame after unscrewing the
fastening cap of the sleeve.
21. Fastening cap.
22. Adjusting screw M8.
23. Pressing spring.
Turning the screw M8 clockwise increases the spring
tension and you can increase the brake torque.
Turning the screw M8 counterclockwise decreases the
spring tension and you can decrease the brake torque.
Adjusting of Force of Pressure Roll
Force
Pressure force is adjusted by turning the adjustment nut
clockwise to increase force, counterclockwise to decrease
force.
WARNING
If the roll pressure is too low the roll will slide on the wire.
If the roll pressure is set too high the wire may be
deformed, which will cause feeding problems in the
welding gun. The pressure force should be set properly.
Decrease the pressure force slowly until the wire just
begins to slide on the drive roll and then increase the
force slightly by turning of the adjustment nut by one turn.
Inserting Electrode Wire into Welding
Torch
Connect the proper welding torch to the Euro socket, the
rated parameters of the torch and of the welding source
shall match.
Remove the gas diffuser and contact tip from the welding
torch.
Set the wire feeding speed in the position of about
10m/min by the WFS knob [2].
Switch the Cold Inch / Gas Purge switch [15] in the
position "Cold Inch" and keep in this position until the
electrode wire leaves the contact tip of the welding torch.
WARNING
Take precaution to keep eyes and hands away from the
end of the torch while feeding wire.
WARNING
Once the wire has finished feeding through the welding
gun turn the wire supply off before replacing to contact tip
and gas diffuser.
Welding methods
Welding with MIG / MAG method
To begin welding process with MIG/MAG method in
manual mode you should:
Switch ON the machine which supplies the wire
feeder.
Insert the electrode wire into the torch using "Cold
Inch" switch [15].
Check gas flow with "Gas Purge" switch [15].
According to selected welding mode and material
thickness set the proper welding voltage with knob [3]
and the wire feeding speed with WFS knob [2].
Obeying the appropriate rules, you can begin to weld.
Welding with MMA (SMAW) method
The LF33S wire feeder enable Manual Metal Arc welding
process that uses a consumable electrode coated in flux
by cooperating with CC (constant current) power sources
like DC 400, DC 655 or V350 PRO.
In order to start welding process with MMA method you
should:
Connect the wire feeder to over mentioned CC power
source by the combined cable.
Connect welding torch into output socket [9].
Switch the power source in CC mode.
Set required welding current by adjusting knob [3].
Obeying appropriate rules you can begin to weld.
LF33S compatibility functions with source
LF33S + CC/CV source
DC 400 DC 655 V 350 PRO
LF 33S Knob [3] Settings before welding
CC CV CC CV CC CV
V No √No √No √
A √No √No On source No
LF 33S Display during and after welding
CC CV CC CV CC CV
V √√√√√√
A √√√√√√

English 8 English
Changing Driving Rolls
The wire feeder is equipped with drive rolls for the wire of
1.0 and 1.2mm. For others wire sizes, is available the
proper drive rolls kit (see chapter Accessories for ordering
the desired kit). Below the drive rolls replacement
procedure:
Switch off the machine which supplies the wire feeder.
Release the pressure roll lever [24].
Unscrew the fastening cap [25].
Open the protection cover [27].
Change the drive rolls [26] with the compatible ones
corresponding to the used wire.
WARNING
For wires with the diameter greater than 1.6mm, the
following parts are to be changed:
The guide tube of the feeding console [28].
The guide tube of the Euro socket [29].
Replace and tighten the protection cover [27] to the
drive rolls.
Screw the protection cover by fastening screws [25].
Gas Connection
WARNING
CYLINDER may explode if damaged.
Always fix the gas cylinder securely in an
upright position, against a cylinder wall
rack or purpose-made cylinder cart.
Keep cylinder away from areas where i
t
may be damaged, heated or electrical
circuits to prevent possible explosion o
r
fire.
Keep cylinder away from welding or othe
r
live electrical circuits.
Never lift welder with cylinder attached.
Never allow welding electrode to touch
cylinder.
Build up of shielding gas may harm health
or kill. Use in a well-ventilated area to
avoid gas accumulation.
Close the gas cylinder valves thoroughl
y
when not in use to avoid leaks.
WARNING
Welding machine supports all suitable shielding gases at
a maximum pressure of 5,0 bar.
WARNING
Before use, make sure that the gas cylinder contains gas
suitable for the intended purpose.
Turn off input power at the welding power source.
Install a proper gas flow regulator to the gas cylinder.
Connect the gas hose to the regulator using the hose
clamp.
The other end of the gas hose connect to the gas
connector on the power source rear panel or directly
to the quick connector located on the rear panel of the
wire feeder [12]. More details you will find in power
source instruction manual.
Connect by dedicated interconnection cable (see
„Accessoriesʺchapter) wire feeder and power source.
Turn on input power at the welding power source.
Open the gas cylinder valve.
Adjust the shielding gas flow of the gas regulator.
Check gas flow with Gas Purge Switch [15].
WARNING
To weld GMAW process with CO2shielding gas, CO2gas
heater should be used.