ANDELI MCT-520DPL Benutzerhandbuch - Seite 7
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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
Tungsten needle burnt seriously
Can not break the oxide film when welding aluminum
13.EXPLOSIVE VIEW
1 Central connector
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 and replaced.
(2) If the abnormal indicator does not light:
a. It may be damaged in the middle plate transformer. The primary inductance and Q value of the main
transformer can be measured by the bridge.
b. It may be that the transformer secondary rectifier is individually broken down, and the same type of
rectifier Is found and replaced.
4. It may be that the feedback circuit is open.
The duty cycle is adjusted too much to reduce the duty cycle.
1. The welding gear selection is incorrect;
2. The duty cycle adjustment is too small;
3. The secondary inverter has field tube damage.