ANDELI MCT-520DPL Manuale d'uso - Pagina 17

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Abnormal indicator light is on, no

output

Can not break the oxide film when

welding aluminum

Tungsten needle burnt seriously

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.

1. The welding gear selection is incorrect;

2. The duty cycle adjustment is too small;

3. The secondary inverter has field tube damage.

The duty cycle is adjusted too much to reduce the duty cycle.