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Abnormal Condition
C.
FAN does not rotate
while the Power Switch
is ON
D.
Open circuit voltage is
less than 60 Volts DC
while the main power
switch is ON.
E.
The available welding
current is maximum and
cannot be controlled
F.
Unstable arc
G.
Erratic Welding Current
Output
Cause
Fault in AC input supply.
Fault in 3 phase AC input
supply
Fault in Control PCB
Fault in Control PCB
Fault in VR, control
potentiometer
Supply voltage fluctuations
(greater than + / - 10%)
Wrong polarity used for the
electrode
Damaged main SCR
One phase missing
Fault in control PCB or Firing
PCB (ZMAT D110)
Damaged main SCR
One phase missing
9
Remedy
Check the three-phase input
AC supply and current.
Check the input line and
rectify.
Replace the PCB
Replace the Control PCB
Check and replace
Check and rectify
Check and rectify
Replace the SCR
Check and rectify
Check and replace
Check & replace
Check & rectify
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