Tweco 190 MIG Thermal Arc Fabricator - Manual (Page 55)

FABRICATOR 190 WELDING MACHINE
Manual No. 0-4838 5-7 MANUAL GMAW WELDING
5.05 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.
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. 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.
2. Two amp circuit breaker in
the wirefeed compartment
has tripped.
Reset the circuit breaker in the
wirefeed compartment.
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.
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). E. Primary input supply voltage is ON, no
wire feed but gas flows from the MIG
Gun when the gun trigger switch is
depressed.
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. Poor or no work lead
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
.
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
H. Jerky wire feed
5. Low Swing Arm pressure Increase the Swing Arm pressure.
1. Gas hose is cut or pinched
Replace or repair.
2. Gas passage contains
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.
I. No gas flow
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 5-2: Power Supply Problems