CEBORA S.p.A. 2
CONTENTS
1 - GENERAL INFORMATION..........................................................................................................................3
1.1 - Introduction. .................................................................................................................................................3
1.2 - General service policy. .................................................................................................................................3
1.3 - Safety information........................................................................................................................................3
1.4 - Electromagnetic compatibility......................................................................................................................3
2 - SYSTEM DESCRIPTION ..............................................................................................................................4
2.1 - Introduction. .................................................................................................................................................4
2.2 - Technical specifications................................................................................................................................4
2.3 - Description of TIG 250 AC/DC power source. ............................................................................................4
3 - MAINTENANCE............................................................................................................................................7
3.1 - Periodic inspection, cleaning........................................................................................................................7
3.2 - Operating sequences.....................................................................................................................................7
3.2.1 - Control panel commands and signals.........................................................................................................7
3.2.2 - Power Source TIG operation. ....................................................................................................................8
3.3 - Troubleshooting..........................................................................................................................................10
3.3.1 - The power source does not start, control panel off..................................................................................10
3.3.2 - Power source powered, control panel on, fan (45) stopped. ....................................................................12
3.3.3 - System powered, display and signals do not show the correct values. ....................................................13
3.3.4 - The start button produces no effect..........................................................................................................15
3.3.5 - In TIG mode, no gas flows from the torch...............................................................................................16
3.3.6 - In TIG mode, gas flows from the torch, the arc does not strike (no high frequency). .............................17
3.3.7 - In open circuit operation, the output voltage is not regular. ....................................................................19
3.3.8 - In resistive load operation, the output voltage is not regular...................................................................22
3.3.9 - AC operation, arc unstable, welding irregular.........................................................................................24
3.4 - Alarm signals..............................................................................................................................................25
3.4.1 - Led (Y) off. Power source output voltage greater than 48 Vac. ..............................................................25
3.4.2 - Led (F) on. Temperature of the transformer (46) or inductor (50) too high, or low pressure of the coolant
fluid.
........................................................................................................................................................25
4 - COMPONENTS LIST...................................................................................................................................26
4.1 - Power source art. 236.76 : see file ESP236.76.pdf enclosed at the end of the manual...............................26
4.2 - Components table : see file ESP236.76.pdf enclosed at the end of the manual..........................................26
4.3 - Spare parts list. ...........................................................................................................................................26
5 - ELECTRICAL DIAGRAMS ........................................................................................................................27
5.1 - Power source art. 236.76 : see file SCHE236.76.pdf enclosed at the end of the manual............................27
5.2 - Waveforms. ................................................................................................................................................27
5.2.1 - Output voltage with open-circuit power source (par. 3.3.7). ...................................................................27
5.2.2 - Firing pulses for SCR1 with open-circuit power source (par. 3.3.7). ......................................................27
5.2.3 - Firing pulses for SCR2 with open-circuit power source (par. 3.3.7). ......................................................27
5.2.4 - Output current with power source loaded in table conditions (par. 3.3.8)...............................................28
5.2.5 - Output voltage with power source loaded in table conditions (par. 3.3.8)...............................................28
5.2.6 - Firing pulses for SCR3 with power source loaded in table conditions (par. 3.3.8)..................................28
5.3 - Mains filter board (51) code 5.600.993/A. .................................................................................................29
5.4 - Fuse board (4) code 5.602.288....................................................................................................................29
5.5 - Control board (40) code 5.602.293/A.........................................................................................................30
5.6 - Shut-off board (48) code 5.602.289............................................................................................................31
5.7 - Snubber board (6) code 5.602.294..............................................................................................................32
5.8 - HF board (42) code 5.602.290....................................................................................................................32
5.9 - HF-filter board (41) code 5.602.291...........................................................................................................33
5.10 - Connector board (49) code 5.602.292. .......................................................................................................33
5.11 - Diode group (19) code 3.200.090/A...........................................................................................................34
3.302.221 15/01/07