Firepower MST 220i, Operating Manual

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FIREPOWER MST 220i
INSTALLATION/SETUP 3-10 Manual 0-5343
1. Power Indicator
The power indicator is illuminated when the correct mains power is applied to the power source and when the
ON/OFF switch located on the rear panel is in the ON position.
2. Thermal Overload Indicator (Fault Indicator)
This welding power source is protected by a self resetting thermostat. The indicator will illuminate if the duty
cycle of the power source has been exceeded. Should the thermal overload indicator illuminate the output
of the power source will be disabled. Once the power source cools down this light will go OFF and the over
temperature condition will automatically reset. Note that the mains power switch should remain in the on
position such that the fan continues to operate thus allowing the unit to cool sufficiently. Do not switch the
unit OFF should a thermal overload condition be present.
3. Digital Wirespeed/Amperage Meter (Left Digital Display)
MIG Mode
This digital meter is used to display the pre-set (preview) Wirefeed Speed in IPM (Inches per minute) in MIG
mode and actual welding amperage of the power source when welding. At times of non-welding, the digital
meter will display a pre-set (preview) value of Wirefeed Speed. This value can be adjusted by varying the
Amperage Control Knob (4).
STICK and LIFT TIG Modes
The digital meter is used to display the pre-set (preview) amperage in STICK / LIFT TIG modes and actual
welding amperage of the power source when welding. At times of non-welding, the amperage meter will
display a pre-set (preview) value in both STICK and LIFT TIG modes. This value can be adjusted by varying
the Amperage Control Knob (4).
When welding, this digital meter will display actual welding amperage in all modes.
At the completion of welding, the digital meter will hold the last recorded amperage value for a period of
approximately 10 seconds in all modes. The amperage meter will hold the value until; (1) any of the front
panel controls are adjusted in which case the unit will revert to preview mode, (2) welding is recommenced,
in which case actual welding amperage will be displayed, or (3) a period of 10 seconds elapses following the
completion of welding in which case the unit will return to preview mode.
NOTE
The preview functionality provided on this power source is intended to act as a guide only. Some dif-
ferences may be observed between preview values and actual welding values due to factors including
the mode of welding, differences in consumables/gas mixtures, individual welding techniques and the
transfer mode of the welding arc (ie dip versus spray transfer). Where exact settings are required (in
the case of procedural work), it is recommended that alternate measurement methods be utilized to
ensure output values are accurate.
3A Wirespeed Indicator
The Wirespeed Indicator illuminates when MIG mode is selected to identify that the Digital Wirespeed/Amper-
age Meter is previewing Wirespeed in IPM (inches per minute).
The Wirespeed Indicator extinguishes when the user is MIG (GMAW/FCAW) welding or depressing the MIG
gun trigger and the Digital Wirespeed/Amperage Meter displays actual welding amperage of the power source.