FAULT FINDING
0464 523 010
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© ESAB AB 2016
The solenoid valve does not work
Symptom
The power source is working but the weld is not good and there is poor or no gas flow when
the torch trigger is pressed.
1. Check that the voltages are present on the auxiliary transformer (T AUX 1), they should
be 0-24 VAC, 0-9 VAC and 0-18 VAC. Are they present?
Yes:
Go to step 2.
No:
Go to step 3.
2. Is the input voltage on the solenoide valve 24 V AC?
Yes:
Replace the solenoide valve.
No:
Check the wiring and connectors between the solenoide valve and T AUX 1.
3. Is there correct mains power supply present at the auxiliary transformer (T AUX 1)?
Yes:
Replace the auxiliary transformer (T AUX 1)
No:
Go to step 4.
4. Is the fuse F1 at the rear of the power source damaged or blown?
Yes:
Replace the fuse F1. Value = 100 mA T.
No:
Replace PCB7.
Welding in DC but not in AC
Symptom
The power source is working, but only in DC mode not in AC.
1. Set the power source in DC mode. Make sure that everything is working normally. Set
the power source in AC mode. Does the power source work in AC mode?
Yes:
The power source is working.
No:
Replace PCB 2 and PCB 8.
2. Does the fault remain?
Yes:
Go to step 3.
No:
Go to section "At completion".
3. Measure between point 2 and 3 on connector J1, the value should be +15 VDC and 0
VDC at OCV. Are the values correct?
Yes:
Fault find the power source as described in section "Fault finding without power
supply" and "Fault finding with power supply".
No:
Replace PCB7.
Fault finding without power supply
To do fault finding without power supply, follow the instructions below.
1. Turn off the power source and wait for five minutes.
2. Remove the cover of the power source.
3. Loosen and remove PCB9 and then PCB1.
