ANDELI MCT Series Owner's Manual page 18

Fault symptom
The fan does not rotate, the
digital meter has no display, and
there is no welding output.
The fan turns, the abnormal
indicator light is not bright, there
is no high-frequency discharge
"sa sa sa" sound, and the "LIFT
TIG welding" can not start the arc.
Abnormal indicator light is off,
there is high frequency discharge
"sa sa sa" sound, no welding
output
Abnormal indicator light is not lit,
no high-frequency discharge "sa
sa sa" sound, arc welding can
start arc
Abnormal indicator light is on, no
output
1. Confirm that the air switch is intact or closed.
2. Confirm that the power grid connected to the output cable has
power.
3. The thermistor (four) on the power supply board is damaged (this is
usually caused by DC24V relay failure or poor contact contact).
4. The power board (base board) is faulty and there is no DC537V
voltage output.
5. The auxiliary power supply on the control panel has failed.
1. Check all kinds of patch cords in the machine for poor contact.
2. Control circuit problems, find the cause or contact the dealer.
3. The control line on the welding torch is broken.
1. The welding gun cable is broken.
2. The ground wire is broken or not connected to the welded
workpiece.
3. The positive output terminal or the torch gas output terminal is loose
from the connection inside the machine.
1. The primary line of the arcing transformer is in poor contact with the
arcing plate and is retightened.
2. The discharge nozzle is oxidized or the distance is remote. The
surface of the discharge nozzle is treated with an oxide film or the
distance of the discharge nozzle is about 1 mm.
3. Hand soldering argon welding conversion switch is damaged and
replaced.
4. The individual components of the high-frequency arc-trigger circuit
are damaged, and the replacement is found.
1. It may be overcurrent protection. Please turn off the machine. When
the abnormal indicator light is off and then restarted, it can be restored.
2. may be overheat protection, do not need to shut down for 2-3
minutes, the machine can naturally return to normal.
3. It may be that the inverter circuit is faulty. Please unplug the power
supply plug of the main transformer on the MOS board (near the fan
VH-07 plug-in) and restart it:
(1) If the abnormality indicator is still on, turn off the power plug of
the high-frequency pilot arc power supply (near the fan VH-03 plug-in)
and turn it back on:
a. If the abnormal indicator is still on, the individual FETs on the MOS
board are damaged.
b. If the abnormal indicator is not lit, the step-up transformer in the
high-frequency arc-rising circuit on the power supply board is broken
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