Tweco 175i Transtig - Manual (Page 67)

TRANSMIG 175i
Manual 0-5143 5-1 POWER SOURCE PROBLEMS AND ROUTINE SERVICE REQUIREMENTS
SECTION 5:
POWER SOURCE PROBLEMS AND ROUTINE SERVICE
REQUIREMENTS
5.01 Power Source Problems
FAULT CAUSE REMEDY
1 Mains supply voltage is ON,
power indicator is illumi-
nated however unit will not
commence welding when
the torch trigger switch is
depressed.
A Power source is not in the
correct mode of operation.
A Set the power source to the cor-
rect mode of operation with the
process selection switch.
B Faulty torch trigger. B Repair or replace torch trigger
switch/lead.
2 Fault Indicator is illumi-
nated 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 com-
mencement of welding.
3 Unit will not feed wire in
MIG mode.
A Electrode wire stuck in
conduit liner or contact tip
(burn-back jam).
A Check for clogged / kinked MIG
torch conduit liner or worn
contact tip. Replace faulty com-
ponents.
B Internal fault in power
source
B Have an Accredited CIGWELD
Service Provider investigate the
fault.
4 Welding wire continues to
feed when torch trigger is
released.
A Trigger mode selection
switch is in 4T latch mode.
A Change the trigger mode selec-
tion switch from 4T latch mode
to 2T normal mode.
B Torch trigger leads shorted. B Repair or replace torch trigger
switch/lead.
5 Welding arc cannot be
established in MIG mode.
A MIG torch polarity lead is
not connected into a weld-
ing output terminal.
A Connect the MIG torch polar-
ity lead to either the positive
welding output terminal or the
negative welding output terminal
as required.
B Poor or no work lead
contact.
B Clean work clamp area and en-
sure good electrical contact.
6 Inconsistent wire feed. A Worn or dirty contact tip. A Replace if necessary.
B Worn feed roll. B Replace.
C Excessive brake tension on
wire reel hub.
C Reduce brake tension on spool
hub
D Worn, kinked or dirty con-
duit liner
D Clean or replace conduit liner
7 No gas flow in MIG mode. A Gas hose is damaged. A Replace or repair.
B Gas passage contains
impurities.
B Disconnect gas hose from
the rear of power source or
wirefeeder and blow out impuri-
ties.
C Gas regulator turned off. C Turn on regulator.
D Empty gas cylinder. D Replace gas cylinder.