Tweco 300 ACDC Arcmaster - Manual (Page 51)

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10.03 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 repair the
connection.
3 Welding current
reduces when
welding.
A
B
C
D
E
Loose welding cable
connections.
Incorrect welding cable size.
Improper input connections.
Poor electrode condition.
Wrong welding polarity.
A
B
C
D
E
Tighten all welding cable
connections.
Use proper size and type
of cable.
Refer to Section 2.05 Electrical
Input Requirements.
Replace electrode.
Verify output torch
connections.
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 a
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.
Table 10-3. Power Source Problems