Tweco 500P PowerMaster - Manual (Page 46)

POWERMASTER 500, 500P, 350
SERVICE 5-4 Manual No. 0-4749
5.04 Power Source Problems
FAULT CAUSE REMEDY
1 Mains supply voltage is ON.
Digital meter if off and
welding arc can not be
established.
.
A
B
C
D
E
F
Primary fuse is blown.
Broken connection in
primary circuit.
Voltage links not set
correctly
Control POWER switch is
OFF
Control POWER switch is
faulty
Possibly defective main
control board or display
board
A
B
C
D
E
F
Replace primary fuse.
Have an Accredited Thermal Arc
Service Provider check primary
circuit.
Correct voltage links
Turn switch ON
Have an Accredited Thermal Arc
Service Provider replace the
switch
Have an Accredited Thermal Arc
Service Provider replace the
board(s)
2 Power Source blows input
fuse as soon as power is
applied
A
B
C
D
E
Incorrect input wiring
Voltage links not set
correctly
Control fuse blown
Internal wiring to terminal
block, input rectifier,
IGBT’s, contactors or
changeover board faulty
Possible defective input
rectifier, suppressor, IGBT,
or capacitor board
A
B
C
D
E
Correct input wiring
Correct voltage links
Replace
Have an Accredited Thermal Arc
Service Provider repair the
wiring
Have an Accredited Thermal Arc
Service Provider replace the
components(s) / board(s)
3 Power Source powers up
but fans do not run
A
B
C
Control switch is OFF
No 120VAC on rear outlet
Faulty wiring
A
B
C
Turn switch ON
Replace 20A fuse on rear panel
Have an Accredited Thermal Arc
Service Provider repair the
wiring to fans or main control
board J9
4 Power Source powers up
but fans do not run
D
E
Defective main control pcb
Possible faulty fan(s)
D
E
Have an Accredited Thermal Arc
Service Provider replace pcb
Have an Accredited Thermal Arc
Service Provider replace the
fan(s)