Snap-On TIG250 Operating Instructions Manual
OPERATING INSTRUCTIONS
3.300.916/B
FOR MODELS:
TIG250
IMPORTANT OPERATING INSTRUCTIONS
SAVE THESE INSTRUCTIONS
2
IMPORTANT: BEFORE STARTING THE EQUIPMENT,
READ THE CONTENTS OF THIS MANUAL, WHICH MUST
BE STORED IN A PLACE FAMILIAR TO ALL USERS FOR
THE ENTIRE OPERATIVE LIFE-SPAN OF THE MACHINE.
THIS EQUIPMENT MUST BE USED SOLELY FOR WELDING OPERATIONS.
1 SAFETY PRECAUTIONS
WELDING AND ARC CUTTING CAN BE HARMFUL TO
YOURSELF AND OTHERS. The user must therefore be educated against the hazards, summarized below, deriving from
welding operations. For more detailed information, order the
manual code 3.300.758
ELECTRIC SHOCK - May be fatal.
· Install and earth the welding machine according to
the applicable regulations.
· Do not touch live electrical parts or electrodes with
bare skin, gloves or wet clothing.
· Isolate yourselves from both the earth and the workpiece.
· Make sure your working position is safe.
FUMES AND GASES - May be hazardous to your health.
· Keep your head away from fumes.
· Work in the presence of adequate ventilation, and
use ventilators around the arc to prevent gases from
forming in the work area.
ARC RAYS - May injure the eyes and burn the skin.
· Protect your eyes with welding masks fitted with filtered lenses, and protect your body with appropriate safety garments.
· Protect others by installing adequate shields or curtains.
RISK OF FIRE AND BURNS
· Sparks (sprays) may cause fires and burn the skin;
you should therefore make sure there are no flammable materials in the area, and wear appropriate
protective garments.
NOISE
This machine does not directly produce noise excee-
ding 80dB. The plasma cutting/welding procedure
may produce noise levels beyond said limit; users
must therefore implement all precautions required by law.
PACEMAKERS
· The magnetic fields created by high currents may affect the
operation of pacemakers. Wearers of vital electronic equipment (pacemakers) should consult their physician before
beginning any arc welding, cutting, gouging or spot welding
operations.
EXPLOSIONS
· Do not weld in the vicinity of containers under pressure, or in the presence of explosive dust, gases or
fumes. · All cylinders and pressure regulators used in
welding operations should be handled with care.
ELECTROMAGNETIC COMPATIBILITY
This machine is manufactured in compliance with the
instructions contained in the harmonized standard EN50199,
and must be used solely for professional purposes in an
industrial environment. There may be potential difficulties in ensuring electromagnetic compatibility in nonindustrial environments.
IN CASE OF MALFUNCTIONS, REQUEST ASSISTANCE
FROM QUALIFIED PERSONNEL.
2 DESCRIPTION OF THE EQUIPMENT
Led Mode
C D
These LEDs shows the welding mode selected by the
AC/DC switch AF
Mode key E.
When selected, one of the following LEDs lights:
F, G, H, L, M or N.
In TIG mode there will always be two LEDs lit: one indicating
HF or striking start mode, and the other indicating continuous or pulse mode with 2- or 4-stage command. The
selection changes each time the button is pressed.
The LEDs light alongside the various symbols to display your
choice:
F - LED. TIG welding with arc started without
high frequency.
To light the arc, press the torch trigger or foot switch and
touch the tungsten electrode to the workpiece, then lift it.
This move must be quick and decisive (0.3 sec.).
L - LED. TIG welding with arc started with high
frequency.
To light the arc, press the torch trigger or foot switch: a high
voltage/frequency pilot spark will light the arc.
G - LED. Continuous 2-stage TIG welding
(manual).
When the torch trigger or foot switch is pressed, the current
begins to increase over the previously set "slope up" time,
until it reaches the value set by means of the knob AA.
When the switch is released, the current begins to drop over
the previously set "SLOPE DOWN" time, until it returns to
zero.
IN THIS POSITION, YOU MAY CONNECT THE PEDAL
CONTROL ACCESSORY TIG250FP.
H - LED. Continuous 4-stage TIG welding
(automatic).
This program differs from the previous one in that the arc is
both started and shut off by pressing and releasing the torch
trigger or foot switch.
M - LED. Pulsed 2-stage TIG welding
(manual).
When the torch trigger or foot switch is pressed, the current
begins to increase over the previously set "slope up" time,
until it reaches the value set by means of the knob AA.
When the trigger is released, the current begins to drop over
the previously set "SLOPE DOWN" time, until it returns to
zero.
INSTRUCTION MANUAL FOR ARC WELDING MACHINE
3
IN THIS POSITION, YOU CANNOT CONNECT THE
PEDAL CONTROL ACCESSORY TIG250FP.
N - LED. Pulsed 4-stage TIG welding (auto-
matic).
This program differs from the previous one in that the arc is
both started and shut off by pressing and releasing the torch
trigger or foot switch.
J - LED - THERMAL PROTECTION
Lights when the operator exceeds the duty cycle or percentage intermittence admissible for the machine, and simultaneously blocks the current output.
NOTE: In this condition the fan continues cooling the
power source.
Y - LED
This LED never be lit to ensure safe welding conditions in AC
mode.
A - BALANCE CONTROL
This knob makes it possible to vary the halfperiods of the square wave when working in
TIG AC, welding aluminium.
The point where the two half-waves meet is
zero.
This position will give you less current absorption, reduced
electrode consumption and an ideal ratio between the width
and depth of the bead. If you wish to increase penetration,
turn the knob counter-clockwise; for a cleaner weld with less
penetration, turn the knob clockwise.
THIS FUNCTION IS ENABLED ONLY WHEN TIG WELDING
IS SELECTED IN AC.
AA - KNOB
Adjusts the welding current T.
Also, in combination with the push-button P,
you may:
- adjust the pre gas Q
- adjust the second level of current V
- adjust the "slope up" S
- adjust the "slope down" W
- adjust the pulse frequency U
- adjust the post gas X
- adjust the t/T ratio R
Z - Display
Displays the welding current and the settings selected
by means of the push-button P and adjusted via the knob AA.
LF GJYSZTVAAWAD
X
AE
U
R
AC
AB
C
D
H
M
N
E
A
P
Q
AF
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