Lincoln Electric INVERTEC V200-T - Manual (Page 16)

B-4 OPERATION B-4
OPERATING STEPS
WELDING IN TIG MODE
1. Connect the TIG torch and cable quick connect
plug to the DC- output receptacle. This receptacle
also contains an integral gas connection for the
torch. Connect the work cable to the DC+ recepta-
cle and to the work piece.
2. Set the Welding Process Switch to “2S” when
using a hand or foot amptrol. When using an arc
start switch, “2S or “4S” can be used.
3. Set the TIG Process Switch to the desired posi-
tion.
4. Connect an optional Amptrol or Arc Start Switch to
the Remote Control Connector.
5. Turn on the cylinder gas valve and adjust the flow
regulator to obtain desired flow.
6. Turn the power switch to “230” or “460” as appropri-
ate for your input voltage. NOTE: There will be a
0.5 second gas flow when the power is turned on.
7. Set the Current Control on the control panel to the
maximum desired amps.
8. Depress the Amptrol or Arc Start Switch to energize
the torch and establish an an arc with the work
piece.
NOTE: When the TIG Process Switch is set to “2S” or
“4S” TIG position, depressing the remote control will
start a 0.5 second gas pre-flow before energizing the TIG
torch. When the remote control is released the TIG torch
is de-energized and gas flow will continue for the set post
flow time (0 - 50 sec.).
REMOTE CONTROL OPERATION
A Foot Amptrol™ is optional with the V200-T for
remote current control while TIG welding. An optional
Hand Amptrol may also be used. An optional Arc
Start Switch may be used to start and stop the weld-
ing if no remote control of the current is desired. Refer
to the Accessories section of this manual.
Both the Hand and Foot Amptrol work in a similar
manner. For simplicity, the following explanation will
refer only to “Amptrols”, meaning both Foot and Hand
models. The term “minimum” refers to a foot pedal in
the “up” position, as it would be with no foot pressure,
or a Hand Amptrol in the relaxed position, with no
thumb pressure. “Maximum” refers to a fully
depressed Foot Amptrol, or a fully extended Hand
Amptrol.
When the welder is in TIG modes activating the
Amptrol energizes the electrode terminal and varies
the output welding current from its minimum value of 1
amp, to the maximum value set by the Current Control
on the control panel. This helps eliminate accidental
high current damage to the work piece and/or tung-
sten, and gives a fine control of the current. When the
welder is in the stick mode a remote control has no
effect and is not used.
It is important to note that, in some cases, the tung-
sten will not start an arc at the minimum current
because the tungsten may be too large or cold. To
start an arc reliably, it is important to depress the
Amptrol far enough so that the machine output current
is near the tungsten operating range. For example, a
3/32” tungsten may be used on DC- to weld the full
range. To start the weld, the operator may have to
turn the current control up and depress the Amptrol
approximately 1/4 of the way down. Releasing the
Amptrol to its minimum position may not start the arc.
Also if the current control is set too low, the arc may
not start. In most cases, a large or cold tungsten will
not readily establish an arc at low currents. This is
normal. In DC-, the V200-T will start a 3/32, 2% thori-
ated tungsten electrode at 15 amperes provided the
electrode tip is properly grounded and not contaminat-
ed.
INVERTEC V200-T Sept97