FAULT FINDING
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© ESAB AB 2016
1. Is the not working motor fan supplied with the correct mains power supply?
Yes:
Replace the defective motor fan.
No:
Go to step 2.
2. Is there a correct mains power supply on the power switch S1?
Yes:
Check the motor fan wiring connection.
No:
Go to step 3.
3. Is there a correct mains power supply on the mains power cable?
Yes:
Replace the power switch S1.
No:
Check the mains power supply.
No LEDs lit on the front panel
Symptom
No LEDs are lit on the front panel when the power source is turned on.
1. Check that the voltages are present on the auxiliary transformer (T AUX 1). Are they
0-24 VAC, 0-9 VAC and 0-18 VAC?
Yes:
Replace the logic board PCB7.
NOTE!
It is not necessary to replace the AC drive board PCB8 attached to the logic
board PCB7.
No:
Go to step 2.
2. Is there a correct mains power supply to the auxiliary transformer (T AUX 1)?
Yes:
Replace the auxiliary transformer (T AUX 1).
No:
Go to step 3.
3. Is the fuse (F1) on the rear of the power source damaged or blown?
Yes:
Replace the fuse (F1). Value = 100 mA T.
No:
Go to step 4.
4. Is there a correct mains power supply at the power switch (S1)?
Yes:
Replace the power switch (S1).
No:
Check the mains power supply.
The over temperature LED is blinking
Symptom
The over temperature LED is blinking continuosly.
Before any actions are made, check the following:
•
Make sure that the power source is not working above the maximum capacity.
•
Make sure that the welding conditions and parameters are correct, compare with the data
on the rating plate.
