Thermal Arc 250TS DC CC, Operating Manual

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44
9.03 Power Source Problems
Description Possible Cause Remedy
1 The welding arc
cannot be
established
A
B
The Primary supply voltage
has not been switched ON.
The Welding Power Source
switch is switched OFF.
A
B
Switch ON the Primary supply
voltage.
Switch ON the Welding Power
Source.
C Loose connections internally. C Have an Accredited Thermal
Arc Service Agent repair the
connection.
2 Maximum output
welding current can
not be achieved
with nominal
Mains supply
voltage.
Defective control circuit Have an Accredited Thermal
Arc Service Agent inspect then
repair the welder.
3 Welding current
reduces when
welding
Poor work lead connection to
the work piece. Ensure that the work lead has a
positive electrical connection
to the work piece.
4 No gas flow when
the torch trigger
switch is
depressed.
A
B Gas hose is cut.
Gas passage contains
impurities. A
B Replace gas hose.
Disconnect gas hose from the
rear of Power Source then
raise gas pressure and blow
out impurities.
C Gas regulator turned off. C Turn gas regulator on.
D Torch trigger switch lead is
disconnected or switch/cable
is faulty.
D Reconnect lead or repair faulty
switch/cable.