Tweco 550i Transmig - Manual (Page 73)

TRANSMIG 350i, 450i, 550i
Manual 0-5205 5-1 POWER SOURCE PROBLEMS AND ROUTINE SERVICE REQUIREMENTS
SECTION 5:
POWER SOURCE PROBLEMS AND ROUTINE SERVICE
REQUIREMENTS
5.01 Power Source / Wirefeeder Problems
FAULT CAUSE REMEDY
1 Mains supply voltage is
ON, power indicator is
illuminated however unit
will not commence welding
when the torch trigger
switch is depressed.
A
B
Power source is not in the
correct mode of operation.
Faulty torch trigger.
A
B
Set the power source to the
correct mode of operation with
the process selection switch.
Repair or replace torch trigger
switch/lead.
2 Mains supply voltage is
ON. Indicator light is not lit
and welding arc cannot be
established.
A
B
Primary fuse is blown.
Broken connection in primary
circuit.
A
B
Replace primary fuse.
Have an Accredited CIGWELD
Service Agent check primary
circuit.
3 Fault Indicator is illuminated
and unit will not commence
welding 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.
4 Wirefeeder will not feed wire
in MIG mode.
A
B
Electrode wire stuck in conduit
liner or contact tip (burn-back
jam).
Internal fault in power source
A
B
Check for clogged / kinked MIG
torch conduit liner or worn
contact tip. Replace faulty
components.
Have an Accredited CIGWELD
Service Provider investigate the
fault.
5 Wire continues to feed when
torch trigger released
A
B
Trigger mode selection is in 4T
(LATCH) mode(10 Pin socket
only)
Torch trigger leads shorted
A
B
Change to 2T (NORMAL) mode
Repair or replace Torch /
trigger lead
6 Wire feeds when the
torch trigger switch is
depressed but arc cannot be
established.
Poor or no work lead contact. Clean work clamp area and
ensure good electrical contact.
7 Inconsistent 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
8 Wire does not feed when
torch trigger depressed
Faulty trigger switch / lead Repair or replace Torch /
trigger lead
9 TIG electrode melts when
arc is struck. TIG torch is connected to
the (+) VE terminal. Connect the TIG torch to the (-)
VE terminal.
10 Arc flutters during TIG
welding. Tungsten electrode is too
large for the welding current. Select the correct size of
tungsten
electrode.