Tweco 181i Thermal Arc Fabricator - Manual (Page 83)

Fabricator 181i
Manual 0-5191 5-1 Trouble ShooTing and Service
SECTION 5: POwEr SOurCE PrOBLEMS AND
rOuTINE SErVICE rEQuIrEMENTS
5.01 Power Source Problems
FAuLT CAuSE rEMEDY
1 electricity Supply is on,
power indicator is illumi-
nated however the Power
Source will not commence
welding when the torch trig-
ger switch is depressed.
a Power Source is not in the cor-
rect mode of operation.
a Set the Power Source to the correct
mode of operation with the process
selection switch.
b Faulty torch trigger. b repair or replace torch trigger
switch/lead.
2 Fault indicator is illuminat-
ed and the Power Source
will not commence weld-
ing when the torch trigger
switch is depressed.
duty cycle of Power Source has
been exceeded.
leave the Power Source switched
on and allow it to cool. note that
fault indicator must be extinguished
prior to commencement of welding.
3 The Power Source will not
feed wire in Mig mode.
a electrode wire stuck in conduit
liner or contact tip (burn-back
jam).
a check for clogged / kinked Mig gun
conduit liner or worn contact tip.
replace faulty components.
b Mig gun/SPool gun switch
is switched to SPool gun.
b Switch the Mig gun/SPool gun
switch to Mig gun.
4 Welding wire continues to
feed when torch trigger is
released.
a Trigger mode selection switch
is in 4T latch mode.
a change the trigger mode selection
switch from 4T latch mode to 2T
normal mode.
b Torch trigger leads shorted. b repair or replace torch trigger
switch/lead.
5 Welding arc cannot be
established in Mig mode.
a Mig gun polarity lead is not
connected into a welding out-
put terminal.
a connect the Mig gun polarity lead
to either the positive welding output
terminal or the negative welding
output terminal as required.
b Poor or no work lead contact. b clean work clamp area and ensure
good electrical contact.
6 inconsistent wire feed. a Worn or dirty contact tip. a replace if necessary.
b Worn feed roll. b replace.
c excessive brake tension on wire
reel hub.
c reduce brake tension on spool hub
d Worn, kinked or dirty conduit
liner
d clean or replace conduit liner
7 no gas flow in Mig mode. a gas hose is damaged. a replace or repair.
b gas passage contains impuri-
ties.
b disconnect gas hose from the rear
of Power Source and blow out
impurities.
c gas regulator turned oFF. c Turn on regulator.
d empty gas cylinder. d replace gas cylinder.