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TIG Welding (GTAW) 

This machine does not include a TIG torch necessary for 
TIG welding, but one may be purchased separately.  
Refer to the accessories section for more information. 
 
Most TIG welding is done with DC(-) polarity shown 
here.  If DC(+) polarity is necessary switch the cable 
connections at the machine. 
 

 

 
Connect the torch cable to the (-) 
terminal of the machine and the 
work clamp to the (+) terminal.  
Insert the connector with the key 
lining up with the keyway and 
rotate approximately ¼ turn 
clockwise.  Do not over tighten.  
Finally, connect the gas hose from the TIG torch to the 
gas connector (B) on the front of the machine.  If 
necessary, an extra gas connector for the fitting on the 
front of the machine is included in the package.  Next, 
connect the fitting on the back of the machine to a gas 
regulator on the cylinder of gas to be used.  The required 
fittings are included in the package.  Connect the TIG 
torch trigger to the trigger connector (A) on the front of 
the machine. 
 

TIG Welding with a Water Cooled Torch 

A cooling unit can be applied to the Machine: 

 COOLER-3 for 315DC 

 COOLER-4 for 415DC 

 
If a COOLER unit listed above is connected to the 
Machine, it will be automatically turned ON and OFF in 
order to ensure the torch cooling.  When Stick welding 
mode is used the cooler will be OFF. 
 
This machine does not include a cooled TIG torch, but 
one may be purchased separately.  Refer to the 
accessories section for more information. 
 

 WARNING 

The Machine is provided with an electrical connection for 
the COOLER unit on its rear side.  This socket is ONLY 
for the connection of the COOLER unit listed above. 
 

 WARNING 

Before connecting the cooler unit to the Machine and 
operate, read and understand the Instruction Manual 
supplied with the cooling unit. 

Remote Control Connection 

Refer to the accessories section for a list of 
remote controls.  If a remote control is used, 
it will be connected to the remote connector 
on the front of the machine.  The machine 
will automatically detect the remote control, 
turn on the REMOTE LED, and switch to remote control 
mode.  More information on this mode of operation will 
be given in the next section. 
 

Rear Panel 

A.  Power Switch:  It turns ON 

/ OFF the input power to 
the machine. 

 
B.  Input cable:  Connect it to 

the mains. 

 
C. Fan:  Do not obstruct or 

filter the fan inlet.  The 
“F.A.N.” (Fan As Needed) 
feature automatically turns 
OFF/ON the fan.  When 
the Machine is turned ON the fan is turned ON only 
for the startup time (few seconds).  The fan will start 
with welding operations and will continue to run 
whenever the Machine is welding.  If the Machine 
doesn’t weld for more than 7½ minutes, it will go in 
Green Mode. 

 

Green Mode 

The Green Mode is a feature that puts the machine in a 
stand-by condition: 

  The output is disabled 

  The fan is turned OFF 

  Only the Power ON LED remains ON. 

  A moving red dash is shown in the “V” and “A” 

displays 

 
This reduces the amount of dirt that can be drawn inside 
the Machine and the power consumption. 
To restore the Machine restart to weld or push the TIG 
torch trigger or push any button in the front panel or turn 
the encoder knob. 
 
NOTE: Green Mode long time condition: each 10min of 
continuous Green Mode the fan runs for 1min. 
 
NOTE: If a COOLER TIG torch cooling unit is connected 
to the machine, it will be turned ON/OFF by the Green 
Mode feature. 
 
D.  Gas Inlet:  Connector for the TIG shielding gas.  Use 

the supplied connector to connect the machine to the 
gas source line.  The gas source must have a 
pressure regulator and flow gage installed. 

 
E.  Power supply socket for COOLER:  400Vac socket.  

Connect here the COOLER cooling unit. 

 

Summary of Contents for PRESTOTIG 415DC

Page 1: ...IM3081 09 2021 REV06 PRESTOTIG 315DC 415DC OPERATOR S MANUAL ENGLISH Lincoln Electric Bester Sp z o o ul Jana III Sobieskiego 19A 58 260 Bielawa Poland...

Page 2: ...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 Tec...

Page 3: ...on a 10 min period Output Current Output Voltage 315DC 100 Stick 200A 28 0Vdc 100 TIG 220A 18 8Vdc 60 Stick 250A 30Vdc 60 TIG 250A 20Vdc 40 Stick 270A 30 8Vdc 40 TIG 300A 22 0Vdc 415DC 100 Stick 280A...

Page 4: ...dition Presence MIG mode TIG mode X STICK mode X After 30 minutes of non working X Fan off X The value of efficiency and consumption in idle state have been measured by method and conditions defined i...

Page 5: ...process gas usage depends on cross sectional area of the nozzle For commonly used torches Helium 14 24 l min Argon 7 16 l min Notice Excessive flow rates causes turbulence in the gas stream which may...

Page 6: ...o and or television transmitters and receivers Computers or computer controlled equipment Safety and control equipment for industrial processes Equipment for calibration and measurement Personal medic...

Page 7: ...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 electr...

Page 8: ...ect 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...

Page 9: ...ical Specification section of this manual The machines are designed to operate on engine driven generators as long as the auxiliary can supply adequate voltage frequency and power as indicated in the...

Page 10: ...and understand the Instruction Manual supplied with the cooling unit Remote Control Connection Refer to the accessories section for a list of remote controls If a remote control is used it will be co...

Page 11: ...mptrol or Pedal are allowed trigger is ignored Connecting the Remote command excludes the Output Current Knob of the Machine s user interface Through the Remote command is available the full Output Cu...

Page 12: ...and LEDs will revert to the default state where the Output Current knob sets the output current Memory Pushbuttons These pusbuttons allows to store M or recall M TIG welding programs 10 memory record...

Page 13: ...w level when the operator makes an error and sticks the electrode to the work piece This decrease in current allows the operator to remove the electrode from the electrode holder without creating larg...

Page 14: ...the TIG arc will remain on for 3 seconds if the arc is not started in this time limit the trigger sequence must be restarted The HF arc start strength can be adjusted in the setup menu by changing th...

Page 15: ...Downslope is activated In Stick welding mode this is not used 6 CRATER This function controls the final current value after the Downslope For an explanation of the Crater operation refer to the trigg...

Page 16: ...e TIG torch trigger When the Crater current is reached the output of the machine is turned OFF 4 Step Trigger Sequence To select 4 Step sequence Action Visualization Press several times until the LED...

Page 17: ...d OFF the postflow time will start As shown here after the TIG torch trigger is quickly pressed and released from step 3A it is possible to press and hold the TIG torch trigger another time to end the...

Page 18: ...te FOOT or AMP device is present depending on welding process selected the UP DOWN behavior is different SMAW In SMAW welding mode the remote device set the amperage setting in the whole range bypassi...

Page 19: ...ut of range LED is blinking Indicates that an Input Voltage Overrange protection is active the Machine restarts automatically when the Input Voltage returns in the correct range 06 Inverter voltage lo...

Page 20: ...n 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 Electri...

Page 21: ...300Hz Duty 50 315DC f 200Hz Duty 50 415DC Current selected value Frequency f 0 1Hz 0 1 10Hz step 0 1Hz 10 300Hz step 1Hz 300 500Hz step 10Hz Current selected value Hz Background 30 10 90 step 1 Curren...

Page 22: ...r 2 step No restart function enabled Preflow time 0s Upslope time 0s Downslope time 0s Postflow time 0s 5 300A 315DC 5 400A 415DC Voltage at output studs Current selected value A TIG SPOT FIXED TIME t...

Page 23: ...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...

Page 24: ...4m W000278404 2 315DC 415DC PROTIG NGS 35W EB C5B 5M W000278404 2 315DC 415DC PROTIG NGS 35W EB C5B 8M W000278400 2 315DC 415DC PROTIG NGS 40 EB C5B 5M W000278401 2 315DC 415DC PROTIG NGS 40 EB C5B 8...

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