Saf-Fro PRESTO 300MV Guide

PRESTO 300MV
Cat n° : 8000-36522
Rev : 00
Date : 07/10/2015
www.saf-fro.com
25 Boulevard de la Paix – CS 30003 Cergy Saint-Christophe, 95895 CERGY-PONTOISE CEDEX
EN INSTRUCTIONS FOR USE SAFETY AND MAINTENANCE
FR INSTRUCTIONS D’UTILISATION, DE SÉCURITE ET D’ENTRETIEN
ES INSTRUCCIONES DE USO SEGURIDAD Y MANTENIMIENTO
IT ISTRUZIONI PER L’USO, LA SICUREZZA E LA MANUTENZIONE
DE BEDIENUNGS-, SICHERHEITS- UND WARTUNGSANLEITUNG

Arc welding may be dangerous for the operator
and persons close to the work area.
Read the operating manual.

EN-3
EN
CONTENTS
1 - GENERAL INFORMATION............................................................................................4
1.1 - PRESENTATION OF THE INSTALLATION ......................................................................4
1.2 - WELDING SET COMPONENTS......................................................................................4
2 - TECHNICAL DATA – DATA PLATE................................................................................5
2.1 - ACCESSORIES ...............................................................................................................5
2.2 - DUTY CYCLE AND OVERHEATING................................................................................5
3 - INSTALLATION..............................................................................................................6
3.1 - ELECTRICAL CONNECTIONS TO THE MAINS..............................................................6
3.2 - CONNECTING INPUT POWER.......................................................................................6
3.3 - HANDLING AND TRANSPORTING THE POWER SOURCE ..........................................6
3.4 - POSITIONING AND LOCATION OF THE MACHINE .......................................................6
4 - INSTRUCTIONS FOR USE............................................................................................7
4.1 - STARTING UP .................................................................................................................7
4.2 - CONTROL FUNCTIONS AND CONNECTIONS..............................................................7
4.3 - OTHER CONTROLS AND FEATURES............................................................................7
5 - CONNECTION AND PREPARATION FOR WELDING..................................................8
5.1 - MANUAL SHIELDED METAL ARC ..................................................................................8
5.1.1 - FEATURES ENABLED WITH MMA WELDING ..........................................................8
5.2 - MANUAL GAS TUNGSTEN WELDING............................................................................9
5.2.1 - TIG LIFT ARC STRIKING............................................................................................9
5.2.2 - PREPARING TUNGSTEN ELECTRODE ...................................................................9
6 - HUMAN INTERFACE PRESENTATION ..................................................................... 10
6.1 - CONTROLS AND OPERATIONAL FEATURES ............................................................10
6.2 - LED FUNCTIONS AND ALARM THRESHOLD .............................................................11
7 - OPTIONS ....................................................................................................................12
8 - TROUBLESHOOTIN................................................................................................... 13
9 - MAINTENANCE.......................................................................................................... 14
10 - SPARE PARTS LIST................................................................................................. 15
11 - WIRING DIAGRAM................................................................................................... 17
12 - CERTIFICATION ROHS /EMC ................................................................................. 18

EN-4
EN
1 - GENERAL INFORMATION
1.1 - PRESENTATION OF THE INSTALLATION
The system consists of a modern direct current power source for the
welding of metals, developed via application of the inverter. This special
technology allows for the construction of compact light weight power
source with high performance that make it an excellent work tool suitable
for all types of coated electrodes; cellulosic and aluminum included,
thanks to the possibility to setup Hot Start and Arc Force parameters.
The unit is equipped with over voltage, over temperature and anti-sticking
functions which protect the power source even in the harshest working
conditions; it is also enables the TIG welding with Lift Arc. The unit is

solution to achieve conformance to the limitation of the harmonic current
for equipment connected to public low voltage network.
Other PFC advantages are:
 

 maximising electronic components lifetime,
 increased motor generator compatibility,
 works with long primary cables.
In addition to these characteristics this model has the VRD function. VRD
stands for: “Voltage Reduction Device”.The VRD is a risk reduction device
for the welding unit that considerably reduces the risk of an electric shock

welding and supplies low voltage to the welding terminals in 1,5 second

           
automatically reduces the secondary circuit voltage between the welding
terminals to less than 15 volts when the unit is not working.
The VRD switches ON the power supply for welding when it detects that


1.2 - WELDING SET COMPONENTS.
PRESTO 300MV is delivered in a cardboard box.
This packing is comprised of:
 1 power source,
 
2

 
 1 operator’s manual,
 1 safety instructions.
GENERAL INFORMATION

EN-5
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2 - TECHNICAL DATA – DATA PLATE
PRESTO 300MV FLEX LINE
Power supply

230 V AC – 1 ph – 50/60 Hz

230 V AC – 3 ph – 50/60 Hz

400 V AC – 3 ph – 50/60 Hz

Welding process TIG MMA TIG MMA TIG MMA
Power supply at: ED 60%
ED 100%
3,3 kVA 4,5 kVA
2,5 kVA 3,4 kVA
5,5k VA 6,2 kVA
4,1 kVA 4,6 kVA
5,8 kVA 8,3 kVA
4,0 kVA 6,5 kVA
Primary consumption at I2max.

23,5 A 27,0 A
16 A
19,3 A 21 A
13 A
11,4 A 16,5 A
10 A
Open circuit voltage   
Welding current 5 – 215A 5 – 180A 5 – 270A 5 – 215A 5 – 270A 5 – 270A
Duty cycle at 35%

at 60%
at 100%

150 A 135 A
120 A 105 A

215 A 175 A
170 A 135 A
270 A 270 A
205 A 205 A
160 A 160 A
Electrode diameters
 1,6 to 4,0 mm 1,6 to 5,0 mm 1,6 to 6,3 mm
Weldable electrodes E6010 - E6011 – E6013 – E7018
Protection / insulation class IP22S / H
VRD function 
TIG LIFT start ON
 1,0 to 2,4 mm 1,0 to 2,4 mm 1,0 to 3,2 mm
 220 x 394 x 534 mm / 22 kg
Standards EN 60974-1; EN 60974-10

NOTE: THIS POWER SOURCE CANNOT BE USED IN FALLING RAIN OR SNOW. IT MAY BE STORED OUTSIDE, BUT IT IS NOT DESIGNED FOR
USE WITHOUT PROTECTION DURING PRECIPITATION.
Code letter IP Degrees of protection
First digit 2 
Second digit 1 
2 
3 
S 
was carried out with all parts of the equipment at idle.
IMPORTANT: MAKE SURE THE POWER SOURCE MEETS THE ABOVE REQUISITES. EXCEEDING THE SPECIFIED VOLTAGES CAN DAMAGE THE
WELDING MACHINE AND INVALIDATE THE WARRANTY.
2.1 - ACCESSORIES
Consult the area agents or the dealer.
2.2 - DUTY CYCLE AND OVERHEATING

that the unit can weld at its rated output without overheating. If the unit
overheats, the output stops and the over temperature light comes ON. To
correct the situation, wait the unit to cool. Reduce amperage, voltage or duty
cycle before starting to weld again.
TECHNICAL DATA – DATA PLATE