Parweld XTT-182 DV Operator's Manual page 11

Description possible Cause
Welding arc (a) Work clamp is not
cannot be connected to the work
established piece or the work/torch
leads are not connected
to the machine
(b) Torch lead is discon-
nected
(c) Gas flow incorrectly
set, cylinder empty or
the torch valve is off
Arc start is not (a) Tungsten electrode is
smooth too large for the welding
current .
(b) The wrong electrode
is being used for the
welding job.
(c) Gas flow rate is too
high.
(d) Incorrect shielding
gas is being used.
(e) Poor work clamp
connection to work piece
power source problems
Remedy
a) Connect the work
clamp to the work
Description
piece or connect
The welding
the work/torch leads
arc cannot be
to the right welding
established
terminals.
(b) Connect it to the
'.' terminal.
(c) Select the right
flow rate, change
cylinders or turn
torch valve on.
(a) Select the right
size electrode
(b) Select the right
Maximum
electrode type.
output welding
Refer to basic TIG
current cannot
welding guide
be achieved
(c) Select the correct
with nominal
rate for the welding
mains supply
job. Refer to basic
voltage
TIG welding guide
Welding
(d) Select the right
current
shielding gas. Refer
reduces when
to basic TIG welding
welding
guide
(e) Improve
A total loss of
connection to work
power, pilot
piece
lamp is off,
no output,
the fan is not
operating
Fault lamp is
on, no power
output
rOutIne MaIntenanCe
The only routine maintenance required for the power supply is a
thorough cleaning and inspection, with the frequency depending on
the usage and the operating environment.
Warning
Disconnect primary power at the source before removing the cover.
Wait at least two minutes before opening the cover to allow the
primary capacitors to discharge.
To clean the unit, remove the screws securing the outer cover,
lift off the outer cover and use a vacuum cleaner to remove any
accumulated dirt and dust. The unit should also be wiped clean,
if necessary; with solvents that are recommended for cleaning
electrical apparatus.
Possible cause Remedy
(a) The primary supply (a) Switch on the
voltage has not been primary supply
switched on voltage
(b) The welding power (b) Switch on the
source switch is switched welding power
off source.
(c) The power source is (c) Switch the power
latched on source on and off
(d) Loose connections (d) Have a
internally qualified service
engineer repair the
connection
Defective control circuit Have a qualified
service engineer
inspect then repair
the welder
Poor work lead Ensure that the
connection to the work work lead has a
piece reliable electrical
connection to the
work piece
(a) Failure of input (a) Re-establish
voltage mains supply
(b) Possible over voltage (b) Check voltage
and if necessary
(c) Internal fault with the
move machine to
machine
alternative supply
(c) Have a qualified
service engineer
inspect then repair
the welder
(a) Machine overheated (a) Allow to cool
with fan running
(b) Over current state
(b) Switch off
(c) Internal fault with
mains power to the
machine
machine and re start
(c) Have a qualified
service engineer
inspect
then repair the
welder
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11