Power Source Problems - Thermal Arc Fabricator 211i Operating Manual

PROBLEMS/SERVICE
SECTION 5: POWER SOURCE PROBLEMS AND ROUTINE

5.01 Power Source Problems

FAULT
1 Mains supply voltage is ON,
power indicator is illumi-
nated however unit will not
commence welding when
the torch trigger switch is
depressed.
2 Fault Indicator is illumi-
nated and unit will not
commence welding when
the torch trigger switch is
depressed.
3 Unit will not feed wire in
MIG mode.
4 Welding wire continues to
feed when torch trigger is
released.
5 Welding arc cannot be
established in MIG mode.
6 Inconsistent wire feed.
7 No gas flow in MIG mode.
Manual 0-5225
SERVICE REQUIREMENTS
CAUSE
A Power source is not in the
correct mode of operation.
B Faulty torch trigger.
Duty cycle of power source
has been exceeded.
A Electrode wire stuck in
conduit liner or contact tip
(burn-back jam).
B Internal fault in power
source
A Trigger mode selection
switch is in 4T latch mode.
B Torch trigger leads shorted. B Repair or replace torch trigger
A MIG gun polarity lead is not
connected into a welding
output terminal.
B Poor or no work lead
contact.
A Worn or dirty contact tip.
B Worn feed roll.
C Excessive brake tension on
wire reel hub.
D Worn, kinked or dirty con-
duit liner
A Gas hose is damaged.
B Gas passage contains
impurities.
C Gas regulator turned off.
D Empty gas cylinder.
5-1
FABRICATOR 211i
REMEDY
A Set the power source to the cor-
rect mode of operation with the
process selection switch.
B Repair or replace torch trigger
switch/lead.
Leave the power source
switched ON and allow it to cool.
Note that fault indicator must
be extinguished prior to com-
mencement of welding.
A Check for clogged / kinked MIG
gun conduit liner or worn con-
tact tip. Replace faulty compo-
nents.
B Have an Accredited Thermal Arc
Service Provider investigate the
fault.
A Change the trigger mode selec-
tion switch from 4T latch mode
to 2T normal mode.
switch/lead.
A Connect the MIG gun polar-
ity lead to either the positive
welding output terminal or the
negative welding output terminal
as required.
B Clean work clamp area and en-
sure good electrical contact.
A Replace if necessary.
B Replace.
C Reduce brake tension on spool
hub
D Clean or replace conduit liner
A Replace or repair.
B Disconnect gas hose from the
rear of power source and blow
out impurities.
C Turn on regulator.
D Replace gas cylinder.
PROBLEMS AND ROUTINE SERVICE