Tweco 250 Weldskill MIG - Manual (Page 43)

8-5 Manual No 0-5072
service weldskill 250, 350
December , 2008
4 Mains supply voltage
is ON, no wire feed
but gas flows from
the MIG Torch when
the torch trigger
switch is depressed.
A
B
Electrode wire stuck in conduit
liner or contact tip (burn-back
jam).
Faulty control PCB
A
B
Check for clogged / kinked MIG
Torch conduit liner or worn
contract tip. Replace faulty
components.
Have an Accredited CIGWELD
Service Provider investigate the
fault.
5 Wire feeds when the
torch trigger switch is
depressed but arc can
not be established.
Poor or no work lead contact. Clean work clamp area and ensure
good electrical contact.
6 Jerky wire feed A
B
C
D
Worn or dirty contact tip
Worn feed roll.
Excessive back tension from wire
reel hub.
Worn, kinked or dirty conduit liner
A
B
C
D
Replace
Replace
Reduce brake tension on spool
hub
Clean or replace conduit liner
7 No gas flow A
B
C
D
Gas hose is cut.
Gas passage contains impurities.
Gas regulator turned off.
Empty Cylinder
A
B
C
D
Replace or repair.
Disconnect gas hose from the rear
of Power Source or wirefeeder
then raise gas pressure and blow
out impurities.
Turn on.
Replace cylinder.
8 Gas flow continues
after the torch trigger
switch has been
released.
Gas valve has jammed open due
to impurities in the gas or the gas
line.
Have an Accredited CIGWELD
Service Provider repair or replace
gas valve.
9 Wire does not feed
when torch trigger
depressed
A
B
Faulty trigger switch / lead
Circuit breaker tripped
A
B
Repair or replace Torch / trigger
lead
Reset Circuit Breaker(s)
0 Wire continues to
feed when torch
trigger released
A
B
Wirefeeder in 4T (LATCH) mode
Torch trigger leads shorted
A
B
Change to 2T (NORMAL) mode
Repair or replace Torch / trigger
lead
 Wire feeds when
the torch trigger
switch is depressed
but arc can not be
established and
OVERTEMPERATURE
led is illuminated
Power Source Overtemperature
Protection circuit has operated
Cease welding and allow
Power Source to Cool for 0
minutes. Overtemperature led
will extinguish when the Power
Source has cooled sufficiently.