Tweco 400 MST Arc Master - Manual (Page 26)

4
SEQUENCE OF OPERATION
4 – 1
SEQUENCE OF OPERATION NOTE: Parameter Buttons are used to select the
parameters to be set. The LED's show which func-
tion is being adjusted on the weld sequence graph.
Refer to Symbols Table located in the front of the
manual for Symbol descriptions.
Figure 4-1: 400MST Front Panel
1. Contactor function - Pressing this button
enables Contactor functions.
2. Remote functions - Pressing this button
enables remote current functions.
3. Digital LED displays - Welding amperage, Volt-
age and parameter values are displayed in this
window. Internal warnings such as over tem-
perature, low or high input voltage applied are
signaled to the operator by a warning sound
and error message on the screen.
4. Save/Load Buttons -By using the Save & Load
buttons the operator can easily save up to 5
welding parameter programs.
5. Control knob - Allows the operator to adjust the
output amperage/voltage within the entire
range of the power source, also used to set
each parameter value.
6. Process Button - This button selects between
STICK, Lift TIG, and MIG modes. MIG modes
include MS for mild steel and SS for stainless
steel.
7. Parameter Button. - This button selects
between HOT START, WELD CURRENT, and
ARC CONTROL while in STICK and Lift TIG
modes and selects between WELD VOLTAGE
and INDUCTANCE CONTROL while in MIG
mode. This button is also used in conjunction
with the Save/Load buttons to save and load
welding programs.
1
Stick Welding
 Connect work lead to negative terminal.
 Connect electrode lead to positive terminal.
 Switch machine on.
 Set weld current.
 Set Contactor.
 Connect remote control device if required.
Use the Scroll Buttons to move to the parameter to
be set. The LED will show which function is being
adjusted on the weld sequence graph. Use the
control knob to adjust each parameter.
 Set HOT START .
 Set ARC CONTROL.
 Set WELD current .
Commence welding.
2
LIFT TIG Welding
 Connect work lead to positive terminal.
 Connect TIG torch to negative terminal.
 Switch machine on.
 Set weld current.
 Connect remote control device if required.
Use the Scroll Buttons to move to the parameter to
be set. The LED will show which function is being
adjusted on the weld sequence graph. Use the
control knob to adjust each parameter.
Commence welding.
3
MIG Welding
 Connect work lead to negative terminal.
 Connect electrode lead to positive terminal.
 Switch machine on.
 Set weld voltage.
 Set Inductance.
 Connect Wire feeder.
 Set wire feed speed (IPM).
Use the Scroll Buttons to move to the parameter to
be set. The LED will show which function is being
adjusted on the weld sequence graph. Use the
control knob to adjust each parameter.
Commence welding.
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