Tweco 185TSW DC CC - Manual (Page 47)

47
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
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.