Tweco VAF4 Transmig - Manual (Page 75)

TRANSMIG VAF4
Manual 0-5231 4-11 SERVICE
FAULT CAUSE rEMEDY
5 Power indicator is
ON, no wire feed but
gas flows from the
MIG Torch when the
torch trigger switch is
depressed.
A
B
C
Preflow is operating.
Electrode wire stuck in conduit
liner or contact tip (burn-back
jam).
Faulty motor control PCB.
A
B
C
Adjust preflow time setting. Refer
to Section 3.08.
Check for clogged / kinked MIG
Torch conduit liner or worn contract
tip. Replace faulty components.
Have an Accredited CIGWELD
Service Provider investigate the
fault.
6 Wire feeds when the
torch trigger switch
is depressed but arc
cannot be established.
A
B
C
Poor or no work lead contact.
Wirefeeder signal is not initiating
the power source which could
be caused by a loose 19 pin plug
connection.
A fault or overload condition has
occurred in pins A & B of the 19
pin interconnection lead control
cable and the P.T.C. protection has
activated.
A
B
C
Clean work clamp area and ensure
good electrical contact.
Tighten 19 pin plug connection,
repair or replace the 19 Pin control
cable.
Refer to Subsection 3.29 Protection
of Power Source Contactor
Output Control. (P.T.C.) or have
an Accredited CIGWELD Service
Provider investigate the fault.
7 Wirefeed motor
operates but wire does
not feed.
A
B
C
Pressure on feed rolls not
correctly adjusted.
Incorrect feed rolls used.
Worn feed roll.
A
B
C
Adjust pressure on feed rolls so
that it will be set to a minimum
pressure that will provide
satisfactory wire feed without
slippage.
Check that feed roll being used
matches the wire size and type
being used.
Replace feed roll.
8 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 contact tip.
Replace feed roll.
Reduce brake tension on spool hub.
Clean or replace conduit liner.
9 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 Wirefeeder then raise gas
pressure and blow out impurities.
Turn on Regulator and adjust to
correct pressure.
Replace cylinder.
10 Gas flow continues
after the torch trigger
switch has been
released.
A
B
Postflow is operating.
Gas valve has jammed open due
to impurities in the gas or the gas
line.
A
B
Adjust postflow time setting. Refer
to Subsection 3.08.
Have an Accredited CIGWELD
Service Provider repair or replace
gas valve.
11 Wire does not feed
when torch trigger is
depressed
Faulty trigger switch / lead. Repair or replace Torch / trigger
lead.
12 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.