Paton MultiPRO-250 User manual

Dear customer, thank you for choosing a PATON™welding inverter.
With your purchase, you have acquired a high-quality product that has been manufactured
incorporating the latest findings in the areas of ergonomics, technology and ecology.
Since 1958, E.O. Paton has been a leader in arc welding technology, first for the countries
of the former Soviet Union, and since 1991 for its successor states. In the time since 1991,
E.O. Paton has successfully expanded into around 40 countries and stands for powerful,
reliable and robust technology.
More than 50000 units sold per year testify to the high degree of confidence welders have
in PATON™high-quality products. More than 250 employees work enthusiastically every
day to further extend this lead and to be able to offer you the best possible arc welding
equipment.
Please read these operating instructions carefully and observe all technical and safety-
relevant points. Make sure that you have access to these operating instructions at all times.
Шановний клієнте, дякуємо за вибір інвертора для зварювання Патон™. З цією
покупкою ви отримали високоякісний продукт, який було виготовлено з врахуванням
останніх досягнень у галузях ергономіки, технологій та екології.
З 1958 року Є.О. Патон був лідером у технології дугового зварювання спочатку для
країн колишнього Радянського Союзу, а з 1991 року — для його прийдешніх держав. З
того часу Є.О. Патон успішно вийшов на ринки приблизно 40 країн і є символом
потужної, надійної та стійкої технології.
Продаж понад 50 000 одиниць на рік свідчить про високий рівень довіри
зварювальників до високоякісних продуктів Патон™.
Понад 250 співробітників щодня з ентузіазмом працюють над тим, щоб збільшити це
перевагу і запропонувати вам найкраще обладнання для дугового зварювання.
Будь ласка, уважно прочитайте ці інструкції з експлуатації та дотримуйтеся всіх
технічних та безпекових вказівок. Переконайтеся, що у вас завжди є доступ до цих
інструкцій з експлуатації.

PATON MultiPRO DC MMA/TIG/MIG/MAG - 2 -
EU DECLARATION OF CONFORMITY
Manufacturer
PATON INTERNATIONAL LLC
Novopyrohivska 66, 03045 Kiev, UKRAINE
We hereby declare that the DoC is issued under our sole responsibility and belongs
to the following product:
Product designation:
PATON™MultiPRO 250
PATON™MultiPRO 270-400V
PATON™MultiPRO 350-400V,
Article number:
The object of the declaration is in conformity with the relevant directives and
standards:
Directives:
Safety of machinery - Electrical equipment
of machines -
EN 60204-1:2018
Arc welding equipment - Part 1: Welding
power sources
EN IEC 60974-1:2018/A1:2019,
EN IEC 60974-1:2023-05
Arc welding equipment - Part 10:
Electromagnetic compatibility (EMC)
requirements
EN IEC 60974-10:2014/A1:2015,
EN IEC 60974-10:2022-07
Signed on behalf of:
PATON International LLC
Place and Date:
03045 Kiev, UKRAINE 04.08.2022
Signature
Name, Function:
Mark Tokmakov
Chief Technical Officer
PATON International LLC
Novopyrohivska 66, 03045 Kiev
Tel: [phone]
E-Mail: [e-mail]

- 3 - PATON MultiPRO DC MMA/TIG/MIG/MAG
TABLE OF CONTENTS
INTRODUCTION
1
DECLARATION OF CONFORMITY
2
1. GENERAL INFORMATION
6
2. Start Up Of The Device
11
2.1 Intended Use
11
2.2 Placement Requirements
12
2.3 Connecting To The Power Grid
12
2.4 Connecting The Power Plug
13
3. MANUAL METAL ARC (SMAW) WELDING
13
3.1 Welding Process Cycle - MMA
14
3.2 "HOT-START" Function
14
3.3 "ARC-FORCE" Function
15
3.4 "ANTI-STICK" Function
16
3.5 Current-Voltage Characteristic Slope Control Function
16
3.6 Short-Arc Welding Function
17
3.7 No-Load Voltage Reduction Function
17
3.8 Pulsed Current Welding Function
17
4. TUNGSTEN INERT GAS (GTAW) WELDING
18
4.1.1 Welding Process Cycle - TIG-LIFT
19
4.1.2 TIG-LIFT Arc Striking Function
20
4.2.1 Welding Process Cycle - TIG-2T
20
4.2.2 TIG-2T Torch Button Function
22
4.3.1 Welding Process Cycle - TIG-4T
23
4.3.2 TIG-4T Torch Button Function
24
4.4 Shielding Gas Pre-Flow Function
25
4.5 Shielding Gas Post-Flow Function
25
4.6 Pre-Current Function (Pilot Arc)
25
4.7 Current Ramp-up function
25
4.8 Current Ramp-down function
25
4.9 Crater Filling Current Function
26
4.10 Pulse Current Welding Function
26
5. METAL INERT GAS / METAL ACTIVE GAS ARC WELDING (MIG/MAG)
27
5.1.1 Welding Process Cycle - MIG/MAG-2T
29
5.1.2 Button Function On The Torch - 2Т
29
5.2.1 Welding Process Cycle - MIG/MAG-4T
30
5.2.2 Button Function On The Torch - 4Т and alt.4Т
30
5.3 Inductance Function
31
5.4 Shielding Gas Pre-Flow Function
32

PATON MultiPRO DC MMA/TIG/MIG/MAG - 4 -
5.5 Shielding Gas Post-Flow Function
32
5.6 Welding Voltage Ramp-Up Function & Wire Feed Speed Ramp-Up
32
5.7 Welding Voltage Ramp-Down Function & Wire Feed Speed Ramp-Down
33
5.8 Motor Switch-Off Function
33
6. DEVICE CONFIGURATION
33
6.1 Switching To The Required Function
34
6.2 Switching To The Required Welding Mode
35
6.3 Resetting All Functions Of The Current Welding Mode
35
6.4 Changing The Program Number In The Current Welding Mode
35
7. GENERAL LIST AND SEQUENCE OF FUNCTIONS
36
8. Supply From Power Generators
39
9. Service And Maintenance
39
10. Storage Conditions
40
11. Transportation
40
12. Completion Of The Device
40
13. Safety Rules
41
14. WARRANTY OBLIGATIONS
45
15. Information On Disposal Of Used Equipment
46

- 5 - PATON MultiPRO DC MMA/TIG/MIG/MAG
ATTENTION!: Only use extension cables with the cross-section, length and appropriate
certificates for the area of application. Always fully unroll the cable when using the cable
reel. Avoid the formation of loops or knots on the power/extension cable.
(*values are indicated below).
Electrode
diameter
Set current value
for MMA and TIG
Wire cross-section
diameter for
MIG/MAG
Cross-section of
the mains wire,
mm²
Maximum wire
length, m
230V –PATON™MultiPRO-250
Ø2 mm
max 80A
max Ø0.6 mm
1.0
75
1.5
115
2
155
2.5
195
4
310
Ø3 mm
max 120A
max Ø0.8 mm
1.5
75
2
105
2.5
130
4
205
6
310
Ø4 mm
max 160A
max Ø1.0 mm
2
75
2.5
95
4
155
6
230
Ø5 mm fusible
max 200A
2.5
75
4
125
6
185
Ø5 mm
Ø6 mm fusible
up to 250A
up to Ø1.2 mm
2.5
60
4
100
6
150
400V –PATON™MultiPRO-270-400V, PATON™MultiPRO-350-400V
Ø2 mm
max 80A
max Ø0.6 mm
1.0
135
1.5
205
2
270
2.5
340
4
540
Ø3 mm
max 120A
max Ø0.8 mm
1.5
135
2
175
2.5
220
4
350
6
525
Ø4 mm
max 160A
max Ø1.0 mm
2
130
2.5
160
4
260
6
385
Ø5 mm.
max 220A
2.5
115
4
180
6
270
Ø6 mm fusible
max 270A
max Ø1.2 mm
2.5
85
4
135
6
205
Ø6 mm
up to 350А
up to Ø1,4 mm
2,5
65
4
100
6
150

PATON MultiPRO DC MMA/TIG/MIG/MAG - 6 -
1. GENERAL PROVISIONS
PATON™MultiPRO-250/270-400V/350-400V inverter multifunction machines are designed
for manual metal arc welding (MMA), gas tungsten arc welding (TIG) and metal inert gas /
metal active gas (MIG/MAG) with safety gases and mixtures at direct current. The
advantage of deploying a fully digital control system in this machine is its ability to
seamlessly handle multiple modes like MMA, TIG, and MIG/MAG. Unlike analog controls,
which are typically optimized for a specific mode and face inefficiencies when switched to
other modes, the digital method avoids these common issues. In an entirely digitized
system, the control board leverages its full potential, independent of the operational mode.
The MultiPRO series is engineered specifically for industrial applications. For enhanced
safety and user convenience during TIG or MMA welding procedures, the power source can
be decoupled from the wire feeder. This configuration negates the necessity to transport a
weighty unit with a loaded welding wire spool.
For improved TIG welding capabilities, the welder incorporates an arc initiation mechanism
utilizing high-frequency (HF) technology. This setup allows for TIG welding in 2T and 4T
mode with tungsten electrodes ranging in diameter from 1.0 to 4.0 mm, providing
versatility across various applications and accommodating diverse material thicknesses and
welding scenarios. The integration of the HF module not only facilitates consistent and
efficient arc striking but also minimizes the risk of tungsten contamination. While the HF
technology contributes to enhancing the overall weld quality and integrity, it's important to
note that achieving optimal results still relies on factors such as the welder's skill, shielding
gas quality, and material preparation.
The inverter rectifier can be adjusted to the most optimal setting in various situations. It
provides virtually uninterrupted load duration at the rated current, which is sufficient for
operation with any electrodes from ∅1.6 mm up to ∅6 mm and for semi-automatic welding
with solid wire or flux core of diameter from ∅0.6 mm to ∅1.4 mm. The source is preset to
optimal parameters suitable for a majority of tasks, and while it maintains simplicity,
delving into the advanced settings necessitates considerable expertise from the welder.
This equipment offers seamless transitions between DCEP and DCEN polarities, ensuring
optimal welding performance across various conditions and materials. For environments
posing potential risks, an integrated voltage reduction mechanism is incorporated in the
MMA mode, with an option for activation or deactivation.
A hallmark of PATON™semi-automatic machines is their robust, premium-grade 4-roller,
hermetically sealed wire feed mechanism, inclusive of all primary rollers. Furthermore,
these devices are equipped with the globally recognized EURO type connector, granting
users the flexibility to interchange torches as per their preferences.
The MultiPRO models from PATON™incorporates have a built-in undervoltage protection,
as well as short-term overvoltage protection. Upon shutdown, the unit retains all active
settings and subsequently restores them upon reactivation.

- 7 - PATON MultiPRO DC MMA/TIG/MIG/MAG
Furthermore, the machine has the capacity to store up to 16 unique user programs, each
identifiable by its specific number, within each welding mode.
The implemented input current regulation stabilization system in the device enables
compatibility with various power sources. As a result of maintaining a consistent input
current level, regardless of voltage fluctuations originating from the power source, the
welder can operate correctly and efficiently under diverse power supply conditions like
(power generator or long extension cables).
Main advantages:
1. Wide possibilities of adjusting welding parameters:
a) in MMA mode –1 (basic) + 7 (additional) + 4 (for pulse mode)
b) in TIG mode –1 (basic) + 7 (additional) + 4 (for pulse mode)
c) in MIG/MAG mode –2 (basic) + 6 (additional)
2. The availability of adjustable pulse mode;
3. In addition to surge protection, a system is installed to stabilize operation during
voltage fluctuations in the single-phase supply from 160V to 260V (for the MultiPRO-
250) and from 320V to 440V (for the MultiPRO-270-400V/350-400V);
4. The unit is equipped with a contactless arc ignition module(HF) in 2T or 4T mode for
the DC TIG method, characterized by high-voltage arc initiation on the order of
kilovolts (kV).
5. The device has the capability to be powered by a power generator or by utilizing
lengthy extension cables;
6. Adapted to the standard power network. Due to the high efficiency, the source
provides half the power consumption compared to traditional sources;
7. Adaptive fan speed, i.e. it increases when the unit is hot and slows down when it is
cold. It saves fan life and reduces dust in the unit;
8. The convenience of work thanks to the long loading duration (LD) on the rated
current, which allows to weld practically continuously by electrodes on the rated
current at 25°C;
9. Increased reliability of the unit in dusty production conditions, as the source
microelectronics is placed in a separate compartment;
10. A thermal electronic protection system is installed on all heating elements of the
source;
11. All electronics in the unit are impregnated with two layers of high-quality varnish,
which ensures the reliability of the product during its entire service life;
12. Advanced gas flow control mechanisms can ensure optimal shielding gas coverage,
leading to better weld quality.;
13. High mobility due to the modular design, as well as the device's small size and weight
without losing technical qualities, facilitate welding in hard-to-reach areas.
TECHNICAL CHARACTERISTICS
MultiPRO-250
MultiPRO-270-400V
MultiPRO-350-400V
Supply voltage, V
230
3х400
3х400
Frequency (50/60 Hz), Phases
1
3
3
Supply voltage variation ranges, V
+13%
+15%
+15%
-30%
-15%
-15%
Fuse, inert (A)
35
16
25

PATON MultiPRO DC MMA/TIG/MIG/MAG - 8 -
Nominal current required
29.6 … 35.1
12.1 … 14.1
16,2 … 18,7
Plug
Schuko
CEE-4x16
CEE-4x32
MIG/MAG (METAL INERT GAS / METAL ACTIVE GAS)
Adjustment range, A
30 - 250
30 - 270
30 - 350
Adjustment range, V
12 –28
12 –29
12 –30
rec. Welding wires, (mm)
0.6 –1.2
0.6 –1.2
0,6 –1,4
Max. weight of wire spool, kg
18
18
18
Wire feed mechanisms
Single drive roll
Dual drive roll
Dual drive roll
Wire feed speed control ranges, m/min
2,0 –16
2,0 –16
2,0 –16
Duty cycle 100% (in A) -DC
196
229
293
Duty cycle 60% (in A) -DC
254*
300*
385*
Duty cycle at max. current - DC
62%%
70%
70%
TIG (TUNGSTEN INERT GAS)
Adjustment range, A
12 - 250
12 - 270
14 - 350
rec. TIG Electrodes (mm)
1,0 - 3,2
1,0 - 3,2
1,0 - 4,0
Duty cycle 100% (in A) -DC
200
232
295
Duty cycle 60% (in A) -DC
258*
300*
385*
Duty cycle at max. current - DC
64%
74%
74%
Non-contact ignition unit (oscillator) in
YES
YES
YES
MANUAL METAL ARC WELDING (MMA)
Adjustment range, A
12 - 250
12 - 270
14 - 350
MMA electrode diameter, mm
1.6 –6.0
1.6 –6.0
1,6 –6,0
Duty cycle 100% (in A) -DC
193
225
290
Duty cycle 60% (in A) -DC
250
290*
375*
Duty cycle at max. current - DC
60%
70%
70%
No-load voltage in MMA mode, V
12 / 75
No-load voltage reduction unit in
MMA mode
on/off
Arc ignition voltage, V
110
Hot-Start in MMA mode
Adjustable
Arc-Force in MMA mode
Adjustable
Anti-Stick in MMA mode
Automatic
Pulsed welding modes
MMA: 0.2...500 Hz
TIG: 0.2...500 Hz
MIG/MAG: 5...500 Hz
Nominal consumption, kVA
6.6 … 7.8
8.0 … 9.4
10.7 …12.3
Max. consumption, kVA
9.5
11.4
15.3
Efficiency, %
90
Cooling
Adaptive
Operating temperature range
–25 … +45ºС
Overall dimensions (length, width,
height), mm:
360 х 260 х 270
540 х 360 х 400
540 х 360 х 400
Standards and approvals
EN IEC 60974-1
EN IEC 60974-1
EN IEC 60974-1
Weight without coil and accessories,
kg
14.1
16.5
16.9
Protection class*
IP33
IP33
IP33
Transformer insulation class
H
H
H
Test standard
CE, EAC
CE, EAC
CE, EAC
* Limitation (A)

- 9 - PATON MultiPRO DC MMA/TIG/MIG/MAG
*With reduced power, the MultiPRO-250 power sources can also be operated on a single-phase mains with a Schuko
plug and a suitable adapter. Please note the maximum welding current setting to avoid overloading the mains and
tripping the fuse. In single-phase operation with a Schuko plug, a maximum of 160 A is recommended.
* IP33 housing prevents objects with a diameter of more than 2.5 mm from entering the product, and also provides
protection against rain, when water flowing vertically or at an angle of 60º to the vertical does not disrupt the
operation of the device.
ADVISED CABLE LENGTH FOR WELDING OPERATIONS (MMA MODE):
Set current value
Cable length (one way)
Cross-sectional area
max 100А
2 … 9 m
10 mm2
3…14 m
16 mm2
max 160А
2 … 9 m
16 mm2
3…14 m
25 mm2
max 200А
2 … 7 m
16 mm2
3…10 m
25 mm2
max 250А
2…8 m
25 mm2
3…12 m
35 mm2
max 270А
5 … 11 m
35 mm2
up to 350А
6 … 14 m
35 mm2

PATON MultiPRO DC MMA/TIG/MIG/MAG - 10 -
1. Digital display;
2. Buttons to adjust the selected parameter to decrease and increase (default: for
MMA –welding current, for TIG –welding current, MIG/MAG –welding voltage);
3. Button for selecting the source function in the current welding mode;
4. Button for selecting the welding mode:
a) Manual Metal Arc Welding;(MMA)
b) Gas Tungsten Arc Welding; (TIG DC)
c) Metal Inert Gas / Metal Active Gas Welding (MIG/MAG)
5. Machine overheat indicator: it does not light up usually, but it blinks when
overheated;
6. Wire-filling button (no gas supplied);
7. Button for inserting the welding wire into the MIG torch (gas not supplied);
8. Button mode indicators on the MIG torch (2T/4T mode);
9. Button for selecting functions of the wire feeder;
10. Safety gas check button (no wire feed);
11. Buttons for adjusting parameters to decrease and increase (default: wire feed
speed);
12. KZ-2 EURO type connector for MIG torch connection;
13. Power supply plug to the wire feeder;
14. Control button connector on the torch for TIG welding;
15. Socket for safety gas supply to the torch for TIG welding;
16. Locking the protective cover;
17. Lifting protective cover;
18. Welding wire filler inlet;
19. Safety gas connection when using a MIG torch;
20. Control cable connection from the wire feeder;
21. Main power on/off switch;
22. Wire coil holder with spring braking mechanism;

- 11 - PATON MultiPRO DC MMA/TIG/MIG/MAG
23. Safety gas connection when using an TIG torch;
24. Fuses of the wire feeder and a gas heater;
25. Grounding cable connection point:
26. Socket for a gas heater (36V).
А - Current socket "+", socket type - bayonet:
a. for MMA welding - the MMA electrode cable is connected (in the very rare
cases where special electrodes are used, a "ground" cable is connected);
b. for TIG welding - the "ground" wire is connected;
c. MIG/MAG Welding with solid wire (GMAW) - the polarity cable is connected
from wire feeder to power source;
d. MIG/MAG welding with flux cored wire (FCAW) - the ground cable is
connected;
B - Current socket "-", socket type - bayonet:
a. for MMA welding, a "ground" wire is connected (in very rare cases, with
special electrodes, an electrode wire is connected);
b. for TIG welding - the TIG torch is connected;
c. MIG/MAG welding with solid wire (GMAW) - the ground cable is connected;
d. MIG/MAG welding with flux-cored wire (FCAW) - the polarity cable is
connected from wire feeder to power source;
2. START UP OF THE DEVICE
ATTENTION!: Before starting up the device, please read section 13 "Safety rules".
2.1 INTENDED USE
The machine is designed exclusively for: MIG/MAG (Metal Inert Gas / Metal Active Gas), TIG
(Tungsten Inert Gas) and Manual Metal Arc Welding (MMA). Any modification of the device
may adversely affect the safety. Therefore, any interference with the device, the safety
components or their misuse for other purposes is expressly prohibited. Not following this
prohibition will result in the loss of all warranty and product liability claims.
The product has been developed in accordance with generally approved principles of
technology and with regard to efficiency and operational safety and may therefore be
awarded the CE mark, which confirms these properties.
The use of the welding machine is appropriate if all the requirements of these operating
instructions are met. Start-up and operation may only be carried out by qualified personnel
who have been instructed about the product and trained in the operation of the welding
equipment, provided that the welding unit, power cable and fitted accessories are used as
intended and are in perfect working order.

PATON MultiPRO DC MMA/TIG/MIG/MAG - 12 -
2.2 PLACEMENT REQUIREMENTS
The welding device can be placed and operated outdoors. The internal electrical parts of
the device are protected against direct moisture exposure, but not against condensation
droplets.
ATTENTION! After welding work in hot weather or intensive welding work in any weather,
do not switch off the unit immediately! It is necessary for the electronic components to cool
down within 5 minutes.
ATTENTION! When operating the device in cold seasons, condensed water may appear
inside after the device has been switched off and cooled down! Switch the welding unit on
again 3 - 4 hours after switching it off. For this reason, do not switch off the welding unit in
cold seasons if you plan to switch it on no later than 4 hours after switching it off.
The unit should be positioned in such a way as to ensure a free flow of cooling air through
the vents on the front and rear covers of the unit. Pay attention to metal filings (which are
generated, for example, during grinding), these should not be directly absorbed into the
unit by the fan.
ATTENTION! The device can be life-threatening if hit hard on the ground. Place on a stable
hard surface.
2.3 CONNECTING TO THE POWER GRID
The welding machine is designed as standard for:
1. The mains voltage is 230V (-30% +13%) - for the MultiPRO-250 model;
2. The MultiPRO-270-400V/350-400V models operate on a three-phase 3x380V or
3x400V (-15% +15%) input, facilitated by three conductors - for safety compliance in
welding operations, grounding the machine's enclosure is imperative, which can be
achieved in two ways:
a) by leveraging the fourth conductor in the mains cable, adhering to the
yellow-green international marking standard,
b) by connecting to the bolt terminal at the machine's rear, a practice aligned
with the stringent grounding specifications in CIS nations.
ATTENTION!: If the device is connected to a mains voltage higher than 270 V (for
MultiPRO-270) or 450 V (for MultiPRO-270/350), all manufacturer's warranty obligations are
void! The manufacturer's warranty obligations are also void if the mains phase is
incorrectly connected to source earth.
The mains connector, the cross-sections of the power supply cables, as well as the mains
fuses must be selected according to the technical data of the unit.

- 13 - PATON MultiPRO DC MMA/TIG/MIG/MAG
2.4 CONNECTION OF THE MAINS PLUG
ATTENTION! The plug must match the supply voltage and current consumption of the
welder (see technical data). Use sockets with guaranteed earthing according to safety
regulations!
WARNING! The mains switch in the MultiPRO-250 models is a signal button and blocks
only the power current of the welding machine, but does not completely de-energize the
internal electronics of the machine. For utmost safety, always unplug the unit's power cord
from the electrical outlet after finishing work.
3. MANUAL ARC WELDING WITH A STICK ELECTRODE (MMA)
ATTENTION! Due to unblocked connectors of the welding current connection (device
connection) or dirt on the workpiece connection (paint, corrosion), the connection areas
and wires can get hot and you can get burned if you touch them!
Daily check the welding current connections and, if necessary, lock them by turning them
clockwise. Thoroughly clean the workpiece connection area and attach properly! Do not
use the workpiece structure parts as the welding current return line!
To prepare the source for operation:
-the wire feeder is not needed in this welding mode, so it can be detached;
-insert the electrode cable into the source A "+" socket;
insert the "ground" cable into the source B "-" socket;
-connect the "ground" cable to the piece;
-connect the mains cable to the power supply;
-turn the mains switch 21 on the rear panel to the "ON" position;
-set the welding mode MMA with button 4; the modes are switched in a circle;
-set the current main parameter (the welding current) with button 2;
If necessary, you can adjust additional functions of the welding process, see paragraph 6.1

PATON MultiPRO DC MMA/TIG/MIG/MAG - 14 -
ATTENTION! After the power switch (21) has been switched to the "ON" position, the
covered electrode is under voltage. Do not touch the electrode to conductive objects or
earthed objects such as, for example, the unit housing, etc. as the device will perceive this
condition as a signal to start the welding process.
3.1 WELDING PROCESS CYCLE - SMAW
The procedure for switching the value of any function is described in section 6.1.
3.2 HOT-START FUNCTION
The Hot-Start manual configuration provides precise modulation of the inception welding
amperage during the arc ignition phase. This facilitates equilibrium between energy
expenditure and ignition consistency.
The advantages provided by the function are as follows:
-Highest Ignition Proficiency: Ensures optimal arc initiation, even with low-
ignition potential electrodes.;
-Enhanced Base Material Penetration: Achieves deeper and more consistent
penetration at the ignition phase, thus mitigating potential workpiece damage.;
-Inhibition of Slag Inclusions: Actively counters the onset of slag inclusions during
the welding process.
Manual Adjustment: This feature enables users to set the function level to its minimum
value, resulting in a significant decrease in energy consumption during the initial ignition
phase. This allows the power source to start with voltage levels close to the minimum
achievable range, although it does impact the quality of the ignition moment (making the
apparatus similar to a transformer source). Alternatively, the function can be increased to
its maximum value to enhance the ignition moment (when working with a stable power
grid). However, it's crucial to remember that using the increased current from this function
can lead to the workpiece burning through when welding thin metals. Therefore, we
recommend reducing the value of the "Hot Start" function in such situations.

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Operational Illustration: For an arc initiated with a 3mm electrode at a primary welding
current of 90A, the "Hot-Start" functionality temporarily augments the welding current by
a default of 40%. Consequently, the resultant "Hot-Start" current becomes: 90A ×1.40=126
A
In the Advanced settings, you have the option to adjust both the "Hot Start" power [H.St]
and the "Hot Start" time [t.HS]. It's crucial not to increase these values excessively. When
set too high, a robust mains supply is required. If the mains supply is not sufficiently strong,
the ignition process may not succeed.
To change the value of any function in the current welding mode, see section 6.1.
3.3 ARC-FORCE FUNCTION
Advantages:
-Optimized Short Arc Stability: The technology significantly augments stability
during short arc welding operations, ensuring a consistent and quality weld.
-Efficient Metal Transfer: The system facilitates superior droplet transition from
the electrode to the weld pool, ensuring a smooth and flawless welding
experience.
-Superior Arc Ignition: Improved mechanisms facilitate instant and reliable arc
ignitions, eliminating tedious initiation processes.
-Minimized Electrode Adhesion: While the system drastically diminishes the risk
of electrode sticking to the workpiece, it is crucial to differentiate it from the "Anti-
Stick" feature, which will be elucidated in subsequent sections.
-Adaptable Manual Settings: This feature offers a dual advantage:
a) For delicate operations on thin metals, users can manually dial down the
function to its lowest setting. This not only conserves energy and optimally
distributes heat but also minimizes the risk of a burn-through. However, this
setting might marginally affect short arc stability, rendering the machine's
performance akin to a transformer-based source.
b) Conversely, for tasks requiring enhanced short arc stability, the function can
be ramped up to its highest. While this assures impeccable stability, it
mandates a robust power supply and slightly elevates the risk of burning
through the material.
Operational Mechanics:
If the arc voltage drops below the set threshold necessary for a steady arc, the welding
current will automatically increase by 40%. For those wanting more personalized settings,
both the Arc Force [Ar.F] and the activation threshold [u.AF] can be tweaked manually.
Yet, it's crucial to be careful when modifying these parameters. Excessive adjustments
might hamper the "Anti-Stick" feature, particularly when working with thin electrodes
smaller than Ф 3.2 mm in diameter. More information on this topic will be provided in the
following section.

PATON MultiPRO DC MMA/TIG/MIG/MAG - 16 -
For the procedure for changing the value of any function in the current welding mode, see Section 6.1.
3.4 ANTI-STICK FUNCTION
During the arc's initiation, there's a risk of electrode-workpiece fusion. While the
equipment is designed with safeguards to minimize this, occasional adherence can lead to
electrode compromise. In such scenarios, the system's integrated "Anti-Stick" function,
always active in MMA mode, responds by adjusting the welding current downwards within
0.6 to 0.8 seconds of detecting the issue. This swift response ensures easier electrode
detachment from the workpiece, reducing the chance of unintended arc re-ignition and
potential eye hazards. Once the electrode is successfully detached, the welder can resume
the process smoothly.
3.5 CURRENT-VOLTAGE CHARACTERISTIC SLOPE CONTROL FUNCTION
The slope of the current-voltage characteristic, often denoted as [CVS], varies depending
on the type of electrode coating. For rutile-coated electrodes, like E6013, a standard [CVS]
slope setting of 1.4 V/A is generally advised. However, for electrodes with a basic or main
coating, specifically the E7015 type, a more suitable [CVS] slope is around 1.0 V/A.
Electrodes coated with cellulose, such as E6011, have unique requirements. Their [CVS]
slope is recommended to be within the range of 0.2 to 0.6 V/A. Additionally, for optimal
performance with E6011 electrodes, one might need to increase the "Arc-Force" level,
labeled [u.AF], to as high as 18V in certain situations. However, always refer to the
electrode manufacturer's guidelines for the most accurate settings.
To change the value of any function in the current welding mode, see section 6.1.

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3.6 SHORT ARC WELDING FUNCTION
Short arc welding, a technique where the arc length is kept minimal between the electrode
and the workpiece, is favored for its lower heat input, which is especially apt for welding
thin materials to reduce distortion. This approach grants welders superior control over the
molten weld pool, minimizing spatter and facilitating positional welding, such as overhead
or vertical-up tasks. The result is generally a shallow penetration, stable arc, and cleaner
welds. However, it's imperative to select appropriate electrodes, as not all are suitable for
this method. For this purpose, the machine has an option to turn the "Short-Arc" function
to the "ON" position. By default, it is in the "OFF" position.
To change the value of any function in the current welding mode, see section 6.1.
3.7 NO-LOADING VOLTAGE REDUCTION UNIT FUNCTION
In the welding process in places such as tanks or cisterns, where maintaining a high level of
electrical safety is a priority, the no-load voltage reduction function becomes crucial. In this
equipment model, a unit that reduces no-load voltage has been integrated. After detaching
the electrode from the workpiece, within 0.1 seconds, it reduces the voltage at the source
terminals to a safe level below 12V. By default, this unit is set to the "OFF" position, as
activating this function can affect the quality of arc ignition. To ensure optimal balance
between safety and welding performance, operators should be aware of when and how to
use this function, considering the specifics of the working environment and potential risk.
To change the value of any function in the current welding mode, see section 6.1.
3.8 PULSED CURRENT WELDING FUNCTION
The pulse current function in SMAW (Shielded Metal Arc Welding) introduces a controlled
modulation between a higher peak current and a lower base current during the welding
process. This pulsation aims to optimize the balance between metal deposition rate, heat
input, and penetration.
During the peak current phase, sufficient energy is delivered to ensure proper fusion and
penetration, while the base current phase maintains the arc stability and reduces the
overall heat input. This controlled pulsing can aid in achieving a more consistent and
refined weld bead, mitigating excessive heat build-up and potential warping or distortion of
the workpiece.
For welders, the pulse function in MMA can offer enhanced control, especially beneficial
when working with heat-sensitive materials or in scenarios where precise heat input is
paramount. Proper tuning of the pulse parameters like pulse frequency and the ratio
between peak and base currents can lead to improved weld quality, reduced spatter, and a
more desirable bead appearance.
It also can provide better control over the cooling rate, which can influence the weld's
metallurgical properties and reduce the risk of defects such as porosity and cracking. By
controlling the current and consequently the arc force, there can be a noticeable reduction
in spatter, which results in cleaner welds and less post-weld cleanup.

PATON MultiPRO DC MMA/TIG/MIG/MAG - 18 -
Furthermore, when welding in challenging positions such as vertical or overhead, the pulse
current provides superior control of the weld pool, mitigating risks of sagging or dripping of
the molten metal.
To activate this function on the device, first you need to turn on the current pulse mode
[Po.P] - switch it from "OFF" to "ON" and set four parameters: peak current [I.iP], base
current [I.PS], pulse frequency [Fr.P] and peak-to-base ratio (or "duty cycle") [dut].
By default, the pulse frequency [Fr.P] and duty cycle [dut] are at the most common values
of 5.0Hz and 50%, respectively. When the "duty cycle" parameter is changed from 50%, an
asymmetry is introduced between the peak current and the base current:
default
"duty cycle" [dut] = 50%
"duty cycle" [dut] = 20%
"duty cycle" [dut] = 70%
These parameters are set in different situations in different ways, according to the welder’s requirements. See
paragraph 6.1 to change the value of any function in the current welding mode.
4. TUNGSTEN INERT GAS (GTAW) WELDING
ATTENTION! The default welding cycle set is TIG-2T, see paragraph 4.2.1.
ATTENTION!: The most common protective gas used is pure argon "Ar", sometimes
helium "He", as well as a mixture of these in various proportions. Example: argon + helium
"40% Ar + 60% He". DO NOT allow the use of flammable gases! Use of other gases is
allowed only in agreement with the equipment manufacturer.
ATTENTION! For continuous currents over 150A, be sure to use a water-cooled torch! Sold
separately together with a cooling unit!
ATTENTION! In TIG welding, the proper sharpening of a tungsten electrode is pivotal.
While the electrode should have a pointed end, excessive sharpness can lead to arc
instability, causing it to shift unpredictably. The optimal shape is a slightly blunted point,
offering a balanced and stable arc, especially at elevated currents. It's worth noting that
electrodes that are too sharply tapered can be prone to melting under high currents due to
limited heat distribution at the extremity. Furthermore, always ensure that any grinding
marks from the sharpening process align with the electrode's length, as this aids in
maintaining arc steadiness.