Oerlikon CITOSTEP 255C User manual

IM3091
11/2020
REV03
CITOSTEP 255C & 305C
OPERATOR’S MANUAL
MANUAL DEL USUARIO
MANUEL D’UTILISATION
BRUKSANVISNING
GEBRUIKERSHANDLEIDING
BRUKSANVISNING
KÄYTTÖOHJE
MANUAL DE INSTRUÇÕES
MANUAL DE UTILIZARE
Lincoln Electric Bester Sp. z o.o.
ul. Jana III Sobieskiego 19A, 58-260 Bielawa, Poland

PRINT THIS MANUAL ACCORDINGLY WITH THE PROCEDURE DT0052
MANUAL REVISIONS
DO NOT PRINT THIS PAGE IN THE MANUAL.
REV00:
New manual, 9 language,
REV01:
Remove CE declaration chapter
Updated grapgics in manual
REV02 (PRJ-3164 R2B):
use OPE-25 to styles
IN ALL LANGUAGE (9):
1) Add Customer Assistance Policy subchapter acc. to LEE blue standard
2) Add Authorized Service Shops Location chapter
3) Safety chapter to update (MANUAL & CE ICON)
4) REMOVE website from cover pages
5) cover page:
- correct line under TITLE ( lenght 18cm, center align)
- correct line & logo under adress (total length 18 cm, lines and logos in one line)
6) NEW PICTURE -> Citostep 255C 305C
7) UPDATE DATE (07/2019)
8) UPDATE revision (REV02)
UNIFIED COVER PAGE, make acc to LEE blue std:
1) UPDATE DATE (07/2019)
2) UPDATE revision (REV02)
3) cover page:
- correct line under TITLE ( lenght 18cm, center align)
- correct line & logo under adress (total length 18 cm, lines and logos in one line)
- remove website
- NEW PICTURE -> Citostep 255C 305C
4) secon page (manual revision)
- "PRINT THIS MANUAL ACCORDINGLY WITH THE PROCEDURE DT0052" move to footer (visible only on this page
SPARE PARTS, make acc to LEE blue std::
1) cover page:
- correct line under TITLE ( lenght 18cm, center align)
- correct line & logo under adress (total length 18 cm, lines and logos in one line)
- remove website
- NEW PICTURE -> Citostep 255C 305C
- UPDATE DATE (07/2019)
- UPDATE revision (REV02)
2) Spare parts chapter - remove "– CITOSTEP® 255C & 305C"
3) Correct page numbering
4) Remove WEEE chapter
IM3091REV03 (PRJ-4084):
CORRECT ADDRESS 58-263 TO 58-260
ADD ECO DESIGN CHAPTER
CORRECT Controls and Operational Features SUBCHAPTER
CORRECT WEEE CHAPTER
ADD REACh CHAPTER
CORRECT ACC. TO OPE-25

IM3091
11/2020
REV03
CITOSTEP 255C & 305C
OPERATOR’S MANUAL
ENGLISH
Lincoln Electric Bester Sp. z o.o.
ul. Jana III Sobieskiego 19A, 58-260 Bielawa, Poland

English I English
12/05
THANKS! For having choosen the QUALITY of the Lincoln Electric products.
Please Examine Package and Equipment for Damage. Claims for material damaged in shipment must be notified
immediately to the dealer.
For future reference record in the table below your equipment identification information. 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
ECO design information ...............................................................................................................................................................2
Electromagnetic Compatibility (EMC) ..........................................................................................................................................4
Safety............................................................................................................................................................................................5
Introduction...................................................................................................................................................................................7
Installation and Operator Instructions ..........................................................................................................................................7
WEEE.........................................................................................................................................................................................16
Spare Parts.................................................................................................................................................................................16
REACh........................................................................................................................................................................................16
Authorized Service Shops Location...........................................................................................................................................16
Electrical Schematic...................................................................................................................................................................16
Accessories ................................................................................................................................................................................17

English 1 English
Technical Specifications
NAME INDEX
CITOSTEP 255C W000403587
CITOSTEP 305C W000403588
INPUT
Input Voltage U1EMC Class Frequency
W000403587 230/400V ±10%, Three Phase A 50/60Hz
W000403588 230/400V ±10%, Three Phase A 50/60Hz
Input Power at Rated Cycle Input Amperes I1max cos φ
W000403587 11,4kVA @ 35 Duty Cycle(40°C) 28,5A 0,96
W000403588 15kVA @ 35 Duty Cycle(40°C) 36A 0,96
RATED OUTPUT
Open Circuit
Voltage
Duty Cycle 40°C
(based on a 10 min. period) Output Current Output Voltage
W000403587 16 ÷ 44 Vdc
100% 145A 21,3Vdc
60% 190A 23,5Vdc
35% 250A 26,5Vdc
W000403588 17÷ 46 Vdc
100% 175A 22,8Vdc
60% 225A 25,3Vdc
35% 300A 29Vdc
WELDING CURRENT RANGE
GMAW FCAW-GS FCAW-SS
W000403587 25A ÷ 250A 25A ÷ 250A 25A ÷ 250A
W000403588 30A ÷ 300A 30A ÷ 300A 30A ÷ 300A
RECOMMENDED INPUT CABLE AND FUSE SIZES
Fuse or Circuit Breaker Size Power Lead
230V 400V
W000403587 D 25A D 16A 4 Conductor, 4mm2
W000403588 D 32A D 20A 4 Conductor, 4mm2
DIMENSION
Weight Height Width Length
W000403587 95 kg 810 mm 467 mm 932 mm
W000403588 96,5 kg 810 mm 467 mm 932 mm
WIRE DIAMETER / WIRE FEED SPEED RANGE
WFS RANGE Drive roll Solid wires Aluminum wires Cored wires **
W000403587 1 ÷ 20 m/min 2 0.6 ÷ 1.2 1.0 ÷ 1.2 0.9 ÷ 1.1
W000403588 1 ÷ 20 m/min 2 0.6 ÷ 1.2 1.0 ÷ 1.2 0.9 ÷ 1.1
Protection Rating Operating Humidity (t=20°C) Operating Temperature Storage Temperature
IP23 ≤95% from -10°C to +40°C from -25°C to 55°C
**Polarity change kit must be purchased (see "Accessories" chapter).

English 2 English
ECO design information
The equipment has been designed in order to be compliant with the Directive 2009/125/EC and the Regulation
2019/1784/EU.
Efficiency and idle power consumption:
Index Name Efficiency when max power consumption
/ Idle power consumption Equivalent model
W000403587 CITOSTEP 255C 68,1 % / 12W No equivalent model
W000403588 CITOSTEP 305C 64,0 % / 12W No equivalent model
Idle state occurs under the condition specified in below table
IDLE STATE
Condition Presence
MIG mode
TIG mode
STICK mode
After 30 minutes of non-working
Fan off X
The value of efficiency and consumption in idle state have been measured by method and conditions defined in the product
standard EN 60974-1:20XX.
Manufacturer’s name, product name, code number, product number, serial number and date of production can be read from
rating plate.
XXXXXXXXXX
Code: XXXXX XXXXXX-X
S/N: P1YYMMXXXXX
12
34
5
P1 YY MM XXXXX
5A5A 5B 5D5C
XXXXXXX
Where:
1- Manufacturer name and address
2- Product name
3- Code number
4- Product number
5- Serial number
5A- country of production
5B- year of production
5C- month of production
5D- progressive number different for each machine

English 3 English
Typical gas usage for MIG/MAG equipment:
Material type
Wire
diameter
[mm]
DC electrode positive Wire Feeding
[m/min] Shielding Gas Gas flow [l/min]
Current
[A]
Voltage
[V]
Carbon, low
alloy steel 0,9 ÷ 1,1 95 ÷ 200 18 ÷ 22 3,5 – 6,5 Ar 75%, CO225% 12
Aluminium 0,8 ÷ 1,6 90 ÷ 240 18 ÷ 26 5,5 – 9,5 Argon 14 ÷ 19
Austenic
stainless steel 0,8 ÷ 1,6 85 ÷ 300 21 ÷ 28 3 - 7 Ar 98%, O22% / He 90%, Ar 7,5% CO22,5% 14 ÷ 16
Copper alloy 0,9 ÷ 1,6 175 ÷ 385 23 ÷ 26 6 - 11 Argon 12 ÷ 16
Magnesium 1,6 ÷ 2,4 70 ÷ 335 16 ÷ 26 4 - 15 Argon 24 ÷ 28
Tig Process:
In TIG welding process, gas usage depends on cross-sectional area of the nozzle. For comonnly used torches:
Helium: 14-24 l/min
Argon: 7-16 l/min
Notice: Excessive flow rates causes turbulence in the gas stream which may aspirate atmospheric contamination into the
welding pool.
Notice: A cross wind or draft moving can disrupt the shielding gas coverage, in the interest of saving of protective gas use
screen to block air flow.
End of life
At end of life of product, it has to be disposal for recycling in accordance with Directive 2012/19/EU (WEEE), information
about the dismantling of product and Critical Raw Material (CRM) present in the product, can be found at
https://www.lincolnelectric.com/en-gb/support/Pages/operator-manuals-eu.aspx

English 4 English
Electromagnetic Compatibility (EMC)
11/04
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 with, if necessary, 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 kept as short as possible and should be positioned together. 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
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 can be potential difficulties in ensuring electromagnetic compatibility in those locations,
due to conducted as well as radio-frequency disturbances.
WARNING
This equipment complies with IEC 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to:
CITOSTEP 255C:S sc ≥1,3 MVA
CITOSTEP 305C:S sc ≥1,69 MVA
at the interface point between the user’s supply and the public system. It is the responsibility of the installer or user of the
equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected
only to a supply with a short circuit power Ssc greater than or equal to data on the table above.

English 5 English
Safety
11/04
WARNING
This equipment must 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 damage to this equipment.
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 damage to this equipment. 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 damage to this equipment.
ELECTRIC SHOCK CAN KILL: Welding equipment generates high voltages. Do not touch the electrode,
work clamp, or connected work pieces when this equipment is on. Insulate yourself from the electrode,
work clamp and connected work pieces.
ELECTRICALLY POWERED EQUIPMENT: Turn off 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.
ELECTRIC AND MAGNETIC FIELDS MAY BE DANGEROUS: Electric current flowing through any
conductor creates electric and magnetic fields (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. Use suitable clothing made from durable flame-
resistant material to protect you skin and that of your helpers. Protect other nearby personnel with
suitable, non-flammable screening and warn them not to watch the arc nor expose themselves to the arc.

English 6 English
WELDING SPARKS CAN CAUSE FIRE OR EXPLOSION: Remove fire hazards from the welding area
and have a fire extinguisher readily available. 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 operate this equipment when flammable gases, vapors or liquid combustibles 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 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 hazard 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 7 English
Introduction
The welding machines of the CITOSTEP C enable:
Welding GMAW (MIG/MAG)
Welding FCAW-GS / FCAW-SS
WARNING
In order to weld the cored wires which requiring negative
polarity, polarity change kit must be purchased by user
(see "Accessories" chapter).
The following equipment has been added to
CITOSTEP 255C & 305C:
Operator’s Manual
Work lead - 3m
Gas hose - 2m
Hose clamps – 2 units
Slow-blow fuse - 2A
Slow-blow fuse – 6,3A
Drive roll – V0.8/V1.0
The following equipment was installed to the
CITOSTEP 255C & 305C (see Figure 1.):
1. Gun holder
2. Galvanized chains – 2 units x 0,7m
3. Eye bolts – 2 units
1
2
2
3
3
Figure 1.
For GMAW, FCAW-GS and FCAW-SS process, the
technical specification describes:
Type of welding wire
Wire diameter
Recommended equipment, which can be bought by user,
was mentioned in the chapter "Accessories".
Installation and Operator Instructions
Read this entire section before installation or operation of
the machine.
Location and Environment
This machine will operate in harsh environments.
However, it is important that simple preventative
measures are followed to assure long life and reliable
operation:
Do not place or operate this machine on a surface with
an incline greater 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 to and from the air vents. 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 to a minimum.
This machine has a protection rating of IP23. Keep it
dry when possible and do not place it on wet ground
or in puddles.
Locate the machine away from radio controlled
machinery. Normal operation may adversely affect the
operation of 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.
The machine is protected from overheating by a
temperature sensor.
Minutes or decrease
Duty Cycle
When the machine is overheated the Thermal Overload
Indicator light will turn "ON" on the front panel and the
output of the machine will turn "OFF". When the machine
has cooled to a safe temperature the Thermal Indicator
Overload light will go out and the machine may resume
normal operation. Note: For safety reasons the machine
will not come out of thermal shutdown if the trigger on the
welding gun has not been released.

English 8 English
Input Supply Connection
WARNING
Only a qualified electrician can connect the welding
machine to the supply network. Installation the outlet plug
to power lead and connecting the welding machine had to
be made in accordance with the appropriate National
Electrical Code and local regulations.
Check the input voltage, phase, and frequency supplied to
this machine before turning it on. Verify the connection of
grounding wires from the machine to the input source.
For machines having the following NUMBER:
W000403587, W000403588 the allowable input
voltages are 3x230V 50/60Hz and 3x400V 50/60Hz
(3x400V: factory default).
For more information about input supply refer to the
technical specification section of this manual and to the
rating plate of the machine.
If it is necessary to change the input voltage:
The input cable must be disconnected from the mains
supply and the machine switched OFF.
Remove the left side panel.
Reconnect X11 and X12 according to the diagram
below:
Figure 2.
Replace the left side panel.
Make sure that the amount of mains power available from
the input supply is adequate for normal operation of the
machine. The necessary delayed fuse (or circuit breaker
with "D" characteristic) and cable sizes are indicated in
the technical specification section of this manual.
Output Connections
Refer to points [6], [7] and [8] in the Figure 3.
Controls and Operational Features
1
2 5
4
6
87
3
Figure 3.
1. Power Switch ON/OFF (I/O): Controls the input power
to the machine. Be sure the power source is
connected to the mains supply before turning power
on ("I"). After input power is connected and the power
switch is turned on, the power switch will light up to
indicate the machine is ready to weld.
2. Thermal Overload Indicator: This lamp will
light up when the machine is overheated
and the output has been turned off. This
can occur if the ambient temperature is above 40°C or
the duty cycle of the machine has been exceeded.
Leave the machine on to allow the internal
components to cool, when the lamp turns off normal
operation is possible.
3. Welding Load Voltage Switch: Adjust the
welding load voltage.
WARNING
Do not switch Welding Load Voltage [3] during welding.
4. WFS (Wire Feeding Speed) Control
Knob: It enables continuous control of
wire feeding speed in the range from 1 to
20 m/min.
5. Digital Display Panel: Available as an option(see
"Accessories" chapter - Only CITOSTEP 255C)..
6. EURO Socket: For connecting a welding gun (for
GMAW, FCAW-GS / FCAW-SS process).
7. Low Inductance Negative Output Socket:
For connecting a work lead.
8. High Inductance Negative Output Socket:
For connecting a work lead.

English 9 English
Figure 4.
9. Gas Connector: Connection for gas line.
WARNING
The welding machine supports all suitable shielding gases
at a maximum pressure of 5,0 Bar.
10. Hole Plug: For CO2gas heater socket (see
"Accessories" chapter - K14009-1 CO2Heater
Connection Kit).
11. Power Lead (5m): Connect the supply plug to the
existing input cable that is rated for the machine as
indicated in this manual, and conforms to all applicable
standards. This connection shall be performed only by
a qualified person.
CITOSTEP 255C
1514
18
19
21
20
12
16
17
22 23
Figure 5.
CITOSTEP 305C
1514
18
19
21
20
13
16
17
22 23
Figure 6.
12. Wire Drive (for GMAW, FCAW-GS / FCAW-SS
process): 2-roll wire drive. Only for machine
W000403587 CITOSTEP 255C
13. Wire Drive (for GMAW, FCAW-GS / FCAW-SS
process): 4-roll wire drive. Only for machine
W000403588 CITOSTEP 305C
14. Welding Wire (for GMAW / FCAW-GS / FCAW-SS).
15. Spooled Wire (for GMAW / FCAW-GS / FCAW-SS):
The machine does not include a spooled wire.
16. Wire Spool Support: Maximum 15kg spools. Accepts
plastic, steel and fiber spools onto 51mm spindle. Also
accepts Readi-Reel®type spools onto included
spindle adapter.
WARNING
Be sure that the right side panel of machine is closed
during welding.
17. Cover of Changing Polarity: Covering holes for
Changing Polarity Kit, which can be purchased
separately (see "Accessories" chapter).
WARNING
Positive (+) polarity is set at the factory.
WARNING
Before welding check the polarity for using wires.
18. Cold Inch / Gas Purge Switch: This switch enables
wire feeding or gas flow without turning on output
voltage.
19. Gun Mode Switch: It enables selection of 2-step or 4-
step gun mode. The functionality of 2T/4T mode is
shown in the Figure 7.

English 10 English
20. Burnback Time Control Knob: Sets the time that the
weld output continues after the wire stops feeding. It
prevents the wire from sticking in the puddle and
prepares the end of the wire for the next arc start.
21. Spot Welding Time Control Knob: Adjusts the time
welding will continue even if the trigger is still pulled.
This option has no effect in 4-Step Trigger Mode.
WARNING
Spot Timer has no effect in 4-Step Trigger Mode.
22. Slow-Blow Fuse, F1: Shuts off the supply power when
the current exceeds 2A in primary cable. After the fuse
burns out, it must be replaced with a new one. (See
"Spare Parts" chapter).
255C 305C
Slow-blow
fuse , F1 2A 2A
23. Slow-Blow Fuse, F2: Shuts off the supply power when
the current exceeds 6,3A in secondary cable. After the
fuse burns out, it must be replaced with a new one.
(See "Spare Parts" chapter).
255C 305C
Slow-blow
fuse , F2 6,3A 6,3A
Welding Cables Connections
Insert the plug of the work lead into the socket [7] or [8].
The other end of this lead connects to the welding piece
with the work clamp.
Connect the necessary gun for GMAW, FCAW-GS or
FCAW-SS process to the Euro Socket [6]. Contact tip and
gun’s liner must be adjusted to the type and diameter of
using wire.
Wire Spool Loading
Wire spool type S300 and BS300 cab be installed on the
wire spool support [16] without adapter.
Wire spool type S200, B300 or Readi-Reel®can be
installed, but the applicable adapter must be purchased.
The applicable adapter can be purchased
separately(see "Accessories" chapter).
Wire Spool Type S300 & BS300 Loading
WARNING
Turn off the power source while mounting electrode wire.
2627 25
24
Figure 8.
Turn the machine off.
Open the right side panel.
Unscrew the Locking Nut [24] and remove it from the
Spindle [26].
Place the spool type S300 or BS300 [25] on the
Spindle [26] making certain the Spindle Brake Pin [27]
is put in the hole in back side of spool type S300 or
SB300.
WARNING
Position the spool type S300 or SB300 so that it will rotate
in a direction when feeding so as to be de-reeled from
bottom of the spool.
Re-install the locking nut [24]. Make sure that the
locking nut is tightened.
Wire Spool Type S200 Loading
WARNING
Turn off the power source while mounting electrode wire.
24
30
282627
29
Figure 9.
Turn the machine off.
Open the right side panel.
Trigger pressed
Trigger released
A Welding current
B Burnback time
C WFS
G Gas
Figure 7.

English 11 English
Unscrew the Locking Nut [24] and remove it from the
Spindle [26].
Place the adapter of spool type S200 [28] on the
spindle [26] making certain the spindle brake pin [27]
is put in the hole in back side of the adapter [28]. The
adapter of spool type S200 can be purchased
separately (see "Accessories" chapter).
Place the spool type S200 [30] on the spindle [26]
making certain that the adapter brake pin [29] is put in
the hole in the back side of the spool.
WARNING
Position the spool type S200 so that it will rotate in a
direction when feeding so as to be de-reeled from bottom
of the spool.
Re-install the locking nut [24]. Make sure that the
locking nut is tightened.
Wire Spool Type B300 Loading
WARNING
Turn off the power source while mounting electrode wire.
26
24
31
27
32
Figure 10.
Turn the machine off.
Open the right side panel.
Unscrew the Locking Nut [24] and remove it from the
spindle [26].
Place the adapter of spool type B300 [31] on the
spindle [26].Make certain that the spindle brake pin
[27] is put in the hole in the back side of the adapter.
The adapter of spool type B300 can be purchased
separately (see "Accessories" chapter).
Re-install the locking nut [24]. Make sure that the
locking nut is tightened.
34
31
32
33
35
Figure 11.
Rotate the spindle and adapter so the retaining spring
[32] is at the 12 o'clock position.
Place the spool type B300 [34] on the adapter [31].
Set one of the B300 inside cage wires [35] on the slot
[33] in the retaining spring tab [32] and slide the spool
onto the adapter.
WARNING
Position the spool type B300 so that it will rotate in a
direction when feeding so as to be de-reeled from bottom
of the spool.
32
34
Figure 12.
Wire Spool Type Readi-Reel®Loading
WARNING
Turn off the power source while mounting electrode wire.
26
27 36
24
39
35
37
38
Figure 13.
Turn the machine off.
Open the right side panel.
Unscrew the locking nut [24] and remove it from the
spindle [26].
Place the adapter of spool type Readi-Reel®[36] on
the spindle [26].Make certain that the spindle brake pin
[27] is put in the hole in the back side of the adapter.
The adapter of spool type Readi-Reel®can be
purchased separately (see "Accessories" chapter).
Re-install the locking nut [24]. Make sure that the
locking nut is tightened.
Rotate the spindle and adapter so the retaining spring
[37] is at the 12 o'clock position.
Place the spool type Readi-Reel®[39] on the adapter
[36]. Set one of the Readi-Reel®inside cage wires [35]
on the slot [39] in the retaining spring tab [37].

English 12 English
WARNING
Position the spool type Readi-Reel®so that it will rotate in
a direction when feeding so as to be de-reeled from
bottom of the spool.
Loading the Electrode Wire
Turn the machine off.
Open the right side panel of the machine.
Unscrew the locking nut of the sleeve [24].
Load the spool with the wire on the sleeve such that
the spool turns clockwise when the wire [14] is fed into
the wire feeder.
Make sure that the spindle brake pin [27] goes into the
fitting hole on the spool.
Screw in the locking nut 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.
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 M10, which
is placed inside of the sleeve frame after unscrewing the
locking nut of the sleeve.
41
40
24
Figure 14.
24. Locking Nut.
40. Adjusting Screw M10.
41. Pressing Spring.
Turning the screw M10 clockwise increases the spring
tension and you can increase the brake torque.
Turning the screw M10 anticlockwise decreases the
spring tension and you can decrease the brake torque.
After finishing of adjustment, you should screw in the
locking nut again.
Adjusting Pressure Roll Force
The pressure arm controls the amount of force the drive
rolls exert on the wire.
Pressure force is adjusted by turning the adjustment nut
clockwise to increase force, counterclockwise to decrease
force. Proper adjustment of pressure arm gives the best
welding performance.
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
Gun
Turn the welding machine off.
Depending on welding process, connect the proper
gun to the Euro Socket, the rated parameters of the
gun and of the welding machine should be matched.
Remote the nozzle from the gun and contact tip or
protection cap and contact tip. Next, straighten the gun
out flat.
Insert the wire through the guide tube, over the roller
and guide tube of Euro Socket into liner of gun. The
wire can be pushed into the liner manually for a few
centimeters, and should feed easily and without any
force.
WARNING
If force is required it is likely that the wire has missed the
liner of gun.
Turn the welding machine on.
Depress the gun trigger to feed the wire through the
gun liner until the wire comes out of the threaded end.
Or the Cold Inch / Gas Purge Switch [18] can be used
– keep in "Cold Inch" position until the wire comes out
of the threaded end.
When trigger or the Cold Inch / Gas Purge Switch [18]
is released spool of wire should not unwind.
Adjust wire spool brake accordingly.
Turn the welding machine off.
Install a proper contact tip.
Depending on the welding process and the type of the
gun, install the nozzle (GMAW process, FCAW-GS
process) or protection cap (FCAW-SS process).
WARNING
Take precaution to keep eyes and hands away from the
end of the gun while the wire is being come out of the
threated end.

English 13 English
Changing Driving Rolls
WARNING
Turn the input power off of the welding power source
before installation or changing drive rolls.
CITOSTEP 255C & 305C is equipped with drive roll
V1.0/V1.2 for steel wire.
For others wire sizes, is available the proper drive rolls kit
(see "Accessories" chapter) and follow instructions:
Turn the welding machine off.
Release the pressure roll lever /levers [42].
Unscrew the fastening cap / caps [43].
Open the protection cover [44].
Change the drive roll / rolls [45] with the compatible
ones corresponding to the used wire.
WARNING
Be sure that the gun liner and contact tip are also sized to
match the selected wire size.
WARNING
For wires with the diameter larger than 1.6 mm, the
following parts are to be changed:
●The guide tube of the feeding console [46] and [47].
●The guide tube of the Euro Socket [48].
Replace and tighten the protection cover [44] to the
drive rolls.
Screw fastening cap / caps [43].
Manually feed the wire from the wire reel, the wire
through the guide tube, over the roller and guide tube
of Euro Socket into liner of gun.
Lock the pressure roll lever / levers [42].
CITOSTEP 255C
42
44
45
43
Figure 15.
CITOSTEP 305C
42 47
46
45
44 43 48
42
Figure 16.
Gas Connection
Connect the gas hose to the Gas Connector [9]
located on the rear panel of the machine.
Put the gas cylinder on the machine shelf and secure
it with the chain.
A gas cylinder must be installed with a proper flow
regulator.
Once a gas cylinder with a flow regulator has been
securely installed, connect the gas hose to the
regulator using the hose clamp.
WARNING
The welding machine supports all suitable shielding gases
at a maximum pressure of 5,0 Bar.
WARNING
Always fasten gas cylinder properly in vertical position in a
special holder on the wall or on a carriage. Remember to
close gas cylinder valve after having finished welding.
WARNING
Gas cylinder can be fasten on the machine’s shelf, but the
height of gas cylinder doesn’t have to be higher than
43in/1,1m. See the Figure 17. The gas cylinder which is
fastened on the machine’s shelf has to be secured by
attaching it to the machine using the chain.
Figure 17.

English 14 English
Welding GMAW, FCAW-GS, FCAW-SS
Process
CITOSTEP 255C & 305C can be used to welding GMAW,
FCAW-GS and FCAW-SS process in Manual Mode.
CITOSTEP 255C & 305C do not include the gun
necessary for GMAW, FCAW-GS or FCAW-SS welding.
Depending on the welding process can be purchased
separately (see "Accessories" chapter).
Preparation the Machine for Welding
GMAW, FCAW-GS and FCAW-SS
Process
Procedure of begin welding of GMAW, FCAW-GS or
FCAW-SS process:
Turn the machine off.
Place the machine conveniently near the work area in
a location to minimize exposure to weld spatter and to
avoid sharp bends in the gun cable.
Determine the wire polarity for the wire to be used.
Consult the wire data for this information. If it is
necessary, change polarity, see [17] point – Terminal
Block of Changing Polarity.
Connect output the gun to GMAW, FCAW-GS or
FCAW-SS process to Euro Socket [6].
Make a sure, if it is needed (GMAW, FCAW-GS
process), that the gas shield has been connected.
Connect the work lead to output socket [7] or [8].
Connect the work lead to the welding piece with the
work clamp.
Install the proper wire.
Install the proper drive roll.
Manually push the wire into the gun’s liner.
Turn the machine on.
Insert the wire into the welding gun.
WARNING
Keep the gun cable as straight as possible when loading
electrode through cable.
WARNING
Never use defected gun.
Check gas flow with Gas Purge Switch [18] – GMAW
and FCAW-GS process.
Close the right side panel.
The welding machine is now ready to weld.
WARNING
The right side panel has to be completely closed during
welding.
WARNING
Keep the gun cable as straight as possible when welding
or loading electrode through cable.
WARNING
Do not kink or pull cable around sharp corners.
By applying the principle of occupational health and
safety at welding, welding can be begun.
Transport & Lifting
WARNING
Falling equipment can cause injury and
damage to unit.
To safety transport and lift CITOSTEP 255C & 305C (see
the Figure 18):
Use equipment of adequate capacity to lift and support
unit.
Always lift and support unit using both eye bolts.
Do not use one eye bolt to lift or support unit.
Lift only power source without gas cylinder , cooler
and wire feeder, or any other accessories.
Screw down an eye bolt and apply load axially in 45
degree angle in accordance to the Figure 16.
Ensure equal length of lifting lines.
Do not use handle to lift or support unit.
max 45°
CITOSTEP 255C & 305C
Figure 18.

English 15 English
Maintenance
WARNING
For any repair operations, modifications or maintenances,
it is recommended to contact the nearest Technical
Service Center or Lincoln Electric. Repairs and
modifications performed by unauthorized service or
personnel will cause, that the manufacturer’s warranty will
become null and void.
Any noticeable damage should be reported immediately
and repaired.
Routine maintenance (everyday)
Check condition of insulation and connections of the
work leads and insulation of power lead. If any
insulation damage exists replace the lead
immediately.
Remove the spatters from the welding gun nozzle.
Spatters could interfere with the shielding gas flow to
the arc.
Check the welding gun condition: replace it, if
necessary.
Check condition and operation of the cooling fan.
Keep clean its airflow slots.
Periodic maintenance (every 200 working hours but at
list once every year)
Perform the routine maintenance and, in addition:
Keep the machine clean. Using a dry (and low
pressure) airflow, remove the dust from the external
case and from the cabinet inside.
If it is required, clean and tighten all weld terminals.
The frequency of the maintenance operations may vary in
accordance with the working environment where the
machine is placed.
WARNING
Do not touch electrically live parts.
WARNING
Before the case of welding machine will be removed, the
welding machine had to be turned off and the power lead
had to be disconnected from mains socket.
WARNING
Mains supply network must be disconnected from the
machine before each maintenance and service. After
each repair, perform proper tests to ensure safety.
Customer Assistance Policy
The business of The Lincoln Electric Company is
manufacturing and selling high quality welding equipment,
consumables, and cutting equipment. Our challenge is to
meet the needs of our customers and to exceed their
expectations. On occasion, purchasers may ask Lincoln
Electric for advice or information about their use of our
products. We respond to our customers based on the best
information in our possession at that time. Lincoln Electric
is not in a position to warrant or guarantee such advice,
and assumes no liability, with respect to such information
or advice. We expressly disclaim any warranty of any
kind, including any warranty of fitness for any customer’s
particular purpose, with respect to such information or
advice. As a matter of practical consideration, we also
cannot assume any responsibility for updating or
correcting any such information or advice once it has
been given, nor does the provision of information or
advice create, expand or alter any warranty with respect
to the sale of our products.
Lincoln Electric is a responsive manufacturer, but the
selection and use of specific products sold by Lincoln
Electric is solely within the control of, and remains the sole
responsibility of the customer. Many variables beyond the
control of Lincoln Electric affect the results obtained in
applying these types of fabrication methods and service
requirements.
Subject to Change – This information is accurate to the
best of our knowledge at the time of printing. Please refer
to www.oerlikon-welding.com for any updated information.

English 16 English
WEEE
07/06
Do not dispose of electrical equipment together with normal waste!
In observance of European Directive 2012/19/EC on Waste Electrical and Electronic Equipment (WEEE)
and its implementation in accordance with national law, electrical equipment that has reached the end of its
life must be collected separately and returned to an environmentally compatible recycling facility. As the
owner of the equipment, you should get information on approved collection systems from our local
representative.
By applying this European Directive you will protect the environment and human health!
Spare Parts
12/05
Part List reading instructions
Do not use this part list for a machine if its code number is not listed. Contact the Lincoln Electric Service Department
for any code number not listed.
Use the illustration of assembly page and the table below to determine where the part is located for your particular
code machine.
Use only the parts marked "X" in the column under the heading number called for in the assembly page (# indicate a
change in this printing).
First, read the Part List reading instructions above, then refer to the "Spare Part" manual supplied with the machine, that
contains a picture-descriptive part number cross-reference.
REACh
11/19
Communication in accordance with Article 33.1 of Regulation (EC) No 1907/2006 – REACh.
Some parts inside this product contain:
Bisphenol A, BPA, EC 201-245-8, CAS 80-05-7
Cadmium, EC 231-152-8, CAS 7440-43-9
Lead, EC 231-100-4, CAS 7439-92-1
Phenol, 4-nonyl-, branched, EC 284-325-5, CAS 84852-15-3
in more than 0,1% w/w in homogeneous material. These substances are included in the “Candidate List of Substances of
Very High Concern for Authorisation” of REACh.
Your particular product may contain one or more of the listed substances.
Instructions for safe use:
use according to Manufacturer instructions, wash hands after use;
keep out of reach of children, do not put in mouth,
dispose in accordance with local regulations.
Authorized Service Shops Location
09/16
The purchaser must contact Lincoln Electric or Authorized Service Facility about any defect claimed under warranty
period.
Contact your local Sales Representative for assistance in locating the nearest Authorized Service Facility.
Electrical Schematic
Refer to the "Spare Part" manual supplied with the machine.