FABRICATOR 281 WELDING MACHINE
Manual No. 0-4880B
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TROUBLESHOOTING
6.04 Power Supply Problems
FAULT
CAUSE
REMEDY
A. Indicator light in the ON/OFF Power
Switch is illuminated but welding arc
can not be established.
1. The ON/OFF Power Switch is
off.
Switch the ON/OFF Power Switch
on.
B. Primary Input supply voltage is ON.
Indicator light in the ON/OFF Power
Switch is not lit and welding arc can not
be established.
1. Primary fuses has blown or
primary circuit breaker has
tripped.
Get a qualified electrician to
replace the primary fuses or reset
the circuit breakers.
C. Primary Input indicator light in the ON/
OFF Power Switch is not lit and welding
arc can be established.
1. Indicator light is open circuit.
Have an Accredited Thermal Arc
Service Agent replace the ON/OFF
Power Switch.
D. Primary Input supply voltage is ON and
indicator light in the ON/OFF Power
Switch is lit but when the gun trigger
switch is depressed nothing happens.
1. Gun trigger switch leads are
disconnected.
Reconnect gun trigger switch
leads.
E. Primary Input supply voltage is ON, no
wire feed but gas flows from the MIG
Gun when the gun trigger switch is
depressed.
1. Electrode wire stuck in conduit
liner or contact tip (burn-back
jam).
Check for clogged / kinked MIG
Gun conduit or worn contract tip.
Replace faulty component(s).
2. Faulty control PCB or Tweco
Gun
Have an Accredited Thermal Arc
Service Agent investigate the fault.
F. Wire feeds when the gun trigger
switch is depressed but arc can not be
established.
1 . P o o r o r n o w o r k l e a d
connection.
Clean work clamp area and ensure
good electrical contact.
G. Wire feed and shielding gas ceases
but the MIG gun trigger switch is still
depressed.
1. The Mode Selector switch is
set to Spot
Set the Mode Selector switch is
set to Continuous
.
H. Jerky wire feed
1. Worn or dirty contact tip
Replace
2. Worn feed roll
Replace
3. Excessive back tension from
wire reel hub.roll.
Reduce brake tension on spool
hub
4. Worn, kinked or dirty conduit
liner
Clean or replace conduit liner
5. Low Swing Arm pressure
Increase the Swing Arm pressure.
I. No gas flow
1. Gas hose is cut or pinched
Replace or repair.
2 . G a s p a s s a g e c o n t a i n s
impurities
Disconnect gas hose from the
rear of Fabricator then raise
gas pressure and blow out the
impurities.
3. Gas regulator turned off
Turn on.
4. Empty Cylinder
Refill cylinder.
J. Gas flow continues after the gun trigger
switch has been released.
1. Gas valve has jammed open
due to impurities in the gas or
the gas line.
Have an Accredited Thermal Arc
Service Agent repair or replace
gas valve.
Table 6-2: Power Supply Problems
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