11.02 Power Source Issues, High OCV, No Fan or Abnormal Inverter Frequency
Fault Possible Cause Remedy
1 The Power Indicator
is FLASHING when
primary lead is plugged
into Mains Power and
the outlet switch is
switched ON.
A Frequent switching input switch in
power source over 6 times may cause
power indicator to flash.
A Switch off machine for 10
minutes then switch on power
source once, power indicator
should not flash.
2 Machine powers up
OK and has OCV but
when an arc is struck
the Power Indicator is
FLASHING and it cannot
maintain the arc.
A The soft start circuit or relay J1/ J2
have failed.
A Fix soft start circuit, replace
relay J1/ J2 or replace Inverter
PCB.
3 OCV (open circuit
voltage) is greater than
90VDC
A
B
C
D
E
Check that Mains Supply Voltage is
greater than 276VAC.
Check snubber circuit components
for secondary diodes on Inverter PCB
have failed open circuit:
C1, R74, R1, R2, R3, R83
C15, R75, R20, R21, R23, R30
Check filter circuit components across
the output terminals on Inverter PCB
have failed open circuit:
C13, R14, R15, R16, V3
Component failure in Control PCB.
Ribbon cable has bad electrical
connections.
A
B
C
D
E
Disconnect the machine from
the Mains Supply Voltage
because input voltages greater
than 276VAC will cause
component failures with this
machine.
Replace defective components.
Replace defective components.
Replace Control PCB.
Check ribbon cable for
continuity, replace if faulty.
4 Fan does operate then
stops operating 30
seconds after switch on
A Fan has an intermittent fault or has a
mechanical problem.
A Replace fan
5 No air been blown
out of the front panel
louvres
A
B
C
Airflow inlet duct next to fan or outlet
duct next to front panel/side panel are
blocked with foreign material.
Inverter PCB connector CN1 pins 1 &
2 do not have 24VDC.
Fan is faulty.
A
B
C
Remove the foreign material
from airflow air inlet and/or
outlets.
Check R31 / R35 / R38 are
connected between R28 & U4
pin 1, if open circuit replace
R31/R35 /R38. If no 24VDC
then replace U6 (TL431) then
replace U5 (PC817B).
Replace fan.
6 Mode switch does not
change welding mode
A Faulty push button switch or Control
PCB.
A Replace Control PCB.
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