Firepower MST 140i, Operating Manual

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Firepower MST 140i
Manual 0-53 38 3-13 INSTALLATION, OPERATION AND SETUP
13. Digital Voltage Meter (Right Digital Display)
The digital voltage meter is used to display the both the preview voltage (MIG mode only)
and actual output voltage (all modes) of the Power Source.
At times of non-welding, the voltage meter will display a preview value in MIG mode. This
value can be adjusted by varying the multifunction control knob (Control No. 9). Note that
in STICK and LIFT TIG modes, the voltage meter will not preview welding voltage but will
display Open Circuit Voltage in STICK mode and 0V in LIFT TIG mode.
When welding, the voltage meter will display actual welding voltage in all modes.
At the completion of welding, the digital voltage meter will hold the last recorded voltage
value for a period of approximately 10 seconds in all modes. The voltage meter will hold the
value until; (1) any of the front panel controls are adjusted in which case the Power Source
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 Power Source will return to preview mode.
NOTE
The preview functionality provided on this power source is intended to act as a guide
only. Some differences 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.
MIG
STICK
4T
2T
POWER FAULT
6
14
MIG
LIFT TIG
STICK
4T
2T
V
4
7
3
6
4 6
13
14. 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 or if a fault is detected
in the Inverter. Should the Fault 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 power switch should remain in the on position
such that the fan continues to operate thus allowing the Power Source to cool sufficiently. Do
not switch the Power Source off should a thermal overload condition be present. If the fault
condition does not extinguish, then the Power Supply will need to be taken to an authorized
repair center for analysis.
15. Gas Inlet (MIG mode only for MIG Gun)
The Gas Inlet connection is used to supply the appropriate MIG welding gas to the Power
Source. Refer to section 3.19 to 3.20 for MIG (FCAW/GMAW) set up details.
!
WARNING
Only Welding Shielding Gases specifically designed for arc welding applications
should be used.
16
15
(Back)
16. On / Off Switch
This switch is used to turn the Power Source on/off.
WARNING
When the front digital displays are lit, the machine is connected to the Mains supply
voltage and the internal electrical components are at Mains voltage potential.