Panasonic YD-200KR Operating Instructions Manual page 35

OTHER TROUBLE AND ERROES
When the power switch of the welding machine is turned on, but the POWER indicator lamp does
not go on B
Is a 3-phase
voltage being applied to
the input end of the
welding power unit ?
YES
When the POWER switch
[14] is turned on, does
the cooling fan start?
YES
Is the electromagnetic
contactor turned on ?
YES
What is a voltage at both
ends of the
indicator, lamp [2l] ?
YES
The printed circuit
board is defective.
When the power indicator lamp goes on, but welding cannot be done (no arc is produced)

Is the electromagnetic
contactor turned on ?
YES
When the torch switch is
turned on, is the wire
fed ?
YES
Is the output
properly connected and
the cable condition
normal?
YES
 The
printed
board is defective.
 The thyristors SCR1 ～
SCR6 are damaged.
 The control transformer
is defective.
rated
NO
Is the switch of the
switch box turned on ?
The fuse(Fu1) is gone.
NO
The
defective.
NO
The
board is defective.
DC24V
POWER The POWER indicator lamp
is defective.
NO
The electromagnetic
contactor
defective.
Is
NO
output
voltage
generated?
cable
NO
Connect
properly and
firmly.
circuit
cooling fan is
printed circuit
is
Is the wire
the
NO
fed
turning on
the inching
switch.
 The
printed
circuit board
is defective.
３１
FOR YOUR INFORMATION
YES
Is the switch of the
switch box turned on ?
Is the switch of the
switch box turned on ?
Is the switch of the
switch box turned on ?
NO
 The
by
is gone.
 The
circuit board is
defective.
 Is
YES
feeder
connected?
 Is
roller of the wire
feeder
set?
 Is the chip not
clogged.
NO
YES
C
fuse(Fu2)
printed
the wire
properly
the feed
properly