Section 5: Power Source Problems And Routine Service Requirements; Power Source Problems - Firepower MST 180i Operating Manual

SECTION 5: POWER SOURCE PROBLEMS AND

5.01 Power Source Problems

FAULT
1 Electricity Supply is ON, power in-
dicator is illuminated however the
Power Source will not commence
welding when the torch trigger
switch is depressed.
2 Fault Indicator is illuminated and
the Power Source will not com-
mence welding when the torch
trigger switch is depressed.
3 The Power Source will not feed
wire in MIG mode.
4 Welding wire continues to feed
when torch trigger is released.
5 Welding arc cannot be established
in MIG mode.
6 Inconsistent wire feed.
7 No gas flow in MIG mode.
8 Gas flow continues after the torch
trigger switch has been released
(MIG mode).
9 Power indicator will not illumi-
nate and welding arc cannot be
established.
10 TIG electrode melts when arc is
struck.
11 Arc flutters during TIG welding.
Manual 0-5339
ROUTINE SERVICE REQUIREMENTS
CAUSE
A Power Source is not in the correct mode of
operation.
B Faulty torch trigger.
Duty cycle of Power Source has been
exceeded.
A Electrode wire stuck in conduit liner or
contact tip (burn-back jam).
B MIG GUN/SPOOL GUN switch is switched
to SPOOL GUN.
A Trigger mode selection switch is in 4T latch
mode.
B Torch trigger leads shorted.
A MIG Gun polarity lead is not connected into
a welding output terminal.
B Poor or no work lead contact.
A Worn or dirty contact tip.
B Worn feed roll.
C Excessive brake tension on wire reel hub.
D Worn, kinked or dirty conduit liner
A Gas hose is damaged.
B Gas passage contains impurities.
C Gas regulator turned OFF.
D Empty gas cylinder.
Gas valve has jammed open due to impuri-
ties in the gas or the gas line.
The Electricity Supply voltage has exceeded
voltage limits of the Power Source.
TIG Torch is connected to the (+) VE
terminal.
Tungsten electrode is too large for the
welding current.
A Set the Power Source to the correct mode of opera-
tion with the process selection switch.
B Repair or replace torch trigger switch/lead.
Leave the Power Source switched ON and allow it to
cool. Note that fault indicator must be extinguished
prior to commencement of welding.
A Check for clogged / kinked MIG Gun conduit liner or
worn contact tip. Replace faulty components.
B Switch the MIG GUN/SPOOL GUN switch to MIG
GUN.
A Change the trigger mode selection switch from 4T
latch mode to 2T normal mode.
B Repair or replace torch trigger switch/lead.
A Connect the MIG Gun polarity lead to either the posi-
tive welding output terminal or the negative welding
output terminal as required.
B Clean work clamp area and ensure good electrical
contact.
A Replace if necessary.
B Replace.
C Reduce brake tension on spool hub
D Clean or replace conduit liner
A Replace or repair.
B Disconnect gas hose from the rear of Power Source
and blow out impurities.
C Turn ON regulator.
D Replace gas cylinder.
Have an accredited Firepower service provider repair
or replace gas valve.
Ensure that the Electricity Supply voltage is within
208-265 VAC.
Connect the TIG Torch to the (-) VE terminal.
Select the correct size of tungsten electrode. Refer
to Table 4-7.
Table 5-1
5-1
Firepower MST 180i
REMEDY
TROUBLE SHOOTING AND SERVICE