Tweco 170i Transarc - Manual (Page 55)

TRANSARC 170i
Manual 0-5281 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 volt-
age is ON, Amps
Display is illuminated
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 correct
mode of operation with the process
selection switch.
B Faulty torch trigger. B Repair or replace torch trigger
switch/lead.
2 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.
3 Welding arc cannot
be established.
A Poor or no work lead contact. A Clean work clamp area and ensure
good electrical contact.
B Trigger switch faulty or discon-
nected.
B Connect or repair trigger switch.
4 No gas flow in TIG
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 impurities.
C Gas regulator turned off. C Turn on regulator.
D Empty gas cylinder. D Replace gas cylinder.
5 Gas flow continues
after the torch trig-
ger switch has been
released (TIG mode).
A Gas valve has jammed open due
to impurities in the gas or the gas
line.
A Have an accredited CIGWELD
service provider repair or replace
gas valve.
B Post flow is active in TIG modes. B Reduce post flow time
6 Amps Display will
not illuminate and
welding arc cannot be
established.
The mains supply voltage has
exceeded voltage limits of the
power source.
Ensure that the mains supply volt-
age is within 240VAC ± 15%.
7 TIG electrode melts
when arc is struck.
TIG torch is connected to the (+)
VE terminal.
Connect the TIG torch to the (-) VE
terminal.
8 Arc flutters during
TIG welding.
Tungsten electrode is too large
for the welding current.
Select the correct size of tungsten
electrode. Refer to Table 4-3.
9 Fault light is on ,and
E-1 is shown on the
Amps display
A Fail to Safe protection has oper-
ated in STICK mode- VRD fault.
A Reset mains power, if fault does not
clear then replace control board.
B Fail to safe protection has oper-
ated in TIG mode- Inverter fault.
B Reset mains power, if fault does not
clear then replace control board.
C External voltage has been applied
to the welding circuit.
C Reset mains power and remove the
source of the external voltage.