Power-Up Sequence - Lincoln Electric PRECISION TIG SVM186-A Service Manual

B-5
8. PULSE TIG CONTROL – The Pulse TIG feature
built into the PRECISION TIG® 225 is simplified to
be a single knob control which sets the Pulse
Frequency over the peak pulses/sec. range of about
0.1 to 20 pulses per second:
• Full CCW (min.) setting of the control knob shuts
off Pulse TIG (0.0 pps).
• Peak Pulse level is set by the Max. Output
Control and the Remote Amptrol (if used).
• Background Current level is typically optimized at
a fixed 50% of Peak Pulse level setting.
• Peak Pulse % On-time is typically optimized at a
fixed 50%.
A Green light "blinks" with each Peak Pulse to indi-
cate the Pulse TIG Control setting before and dur-
ing welding.
9. THERMAL SHUTDOWN LIGHT
panel light turns on if the machine output is shut-
down because internal overheating has occurred,
and turns off when cooled to reset.
10. REMOTE RECEPTACLE – Provides for connec-
tion of remote control and/or arc start switch only in
TIG Mode: (There is no remote output control
capability when stick welding).
• Plugging a remote current control (Amptrol) into
this receptacle automatically switches the output
control from the panel Max Output Control (See
Item 5) to the remote control.
• The connected remote control will then control the
output current between the Min. range of the
machine and the setting of the panel Max Output
Control.
• Switching Mode Switch (See Item 3) to Stick will
automatically disable the connected remote con-
trol and switch the output control back to the Max
Output panel control.
11. ELECTRODE/GAS OUTPUT RECEPTACLE -
This quick connect Twist-Mate™ receptacle pro-
vides electrical connection to the electrode holder
and cable for Stick welding and a combined electri-
cal and gas connection for the TIG torch when TIG
welding.
12. WORK CABLE - This 10ft.(3.05m) cable with work
clamp is factory connected to the welder and its
clamp is connected to the work piece to complete
the welding circuit. Refer to Machine Grounding
and High Frequency Interference Protection in
the Installation section of this manual for the prop-
er procedure on grounding the work clamp and
work piece to minimize high frequency interfer-
ence.
OPERATION

POWER-UP SEQUENCE

When the PRECISION TIG® 225 Power switch is ini-
tially turned On , the following will be observed:
(Refer to this Section Controls and Settings Figure
B.1)
• The cooling fan will run for about 5 seconds.
• The previous (prior to Power Off) settings of Mode
and Maximum Output will be initiated.
• If in TIG Mode, the shielding gas solenoid valve will
be activated for the time set by the Post Flow Time
control.
This Yellow LED
PRECISION TIG® 225
B-5