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Kemppi Minarc Evo 150 Not Powering On, VIPER27H Power Supply Issue

been1 6963 13
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16170856
    been1
    Level 14  
    Welding machine as in the title. When turned on, there is no sign of life except the neon light in the switch.
    Measured diodes and IGBT module and output diodes according to SM. Everything ok, no short circuits. The voltage on the main capacitor is about 310V.
     The VIPER27H power supply does not start. It only sends out starting impulses but does not take up work. The secondary side of the power supply also has no short circuits.
    I powered the system with 24V external voltage but without results. I suspect the short circuit will hit this power supply, but it seems unlikely.
     I have no ideas yet what else to check, maybe some suggestions more experienced in this matter?
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  • #2 16172002
    SQ5AZP
    Level 33  
    The power supply is blocked by a failure signal.
    Replace the Z001 board.
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  • #3 16172545
    been1
    Level 14  
    Thank you SQ5AZP for your interest. Jedak replacement of the Z001 board seems to me unprofitable.
    Maybe blocking the failure signal will allow you to start this power supply and take measurements. For this you need a diagram and that in SM unfortunately is missing.
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  • #4 16172799
    SQ5AZP
    Level 33  
    Everything points to a fault in one of the digitally controlled circuits.
    The small transistor locks the power supply for Viper. Try to power the circuit with 15V external power pin1 ,, - '', pin2 ,, + ''. You will not make records any more.
  • #5 16175765
    been1
    Level 14  
    I paid VIPER as you did and ... surprise. No reaction, even starting pulses have disappeared.
    Adjusting the nap. feeding from 0-15V starting pulses faded from 6V up. I will also venture a VIPER exchange.
  • #6 16177108
    SQ5AZP
    Level 33  
    One more thing.
    Are there output voltages?
    If not - then the actual final stage in the IC may be the cause.
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  • #7 16178719
    been1
    Level 14  
    On the secondary winding there appear pulses of small amplitude.
    After straightening, the C62 is approx. 0.8-1V
  • #8 16180013
    SQ5AZP
    Level 33  
    Raise the supply voltage to above 18V to 20V.

    The level of 15 V is the starting threshold. (I was hoping you would look at the IC documentation yourself.)
  • #9 16180553
    been1
    Level 14  
    Of course, I reviewed the IC documentation, although I admit that it is more of a schematic than parameters.
    I will describe the proceedings thoroughly.
    I connected a 100W bulb to PTC in parallel to keep them warmer and the power supply to the system was relatively constant.
    Voltage on IC: pin2: 6-8V pin3: 0.03V pin4: 0.2V pin: 7.8 260V
    Waveform on the oscilloscope: pin2: similar to a saw with an amplitude of approx. 8V pin3: pulses width 8ms every 100ms amplitude 0.6V pin4: pulses width 8ms every 100ms amplitude 3V
    On the secondary side, as I wrote, bunches with an amplitude of about 2V.
    After applying the external voltage on the IC, adjusting from 0 to 6V, nothing changes. From 6-20V, all IC work is lost.
    I have already ordered VIPER. After the exchange I will describe the effects.
  • #10 16203152
    been1
    Level 14  
    I exchanged VIPER. Unfortunately, nothing has changed. All tensions and waveforms are the same as on the old one. What else can you check?
    A bit of damage to such equipment for scrap.
  • #11 16203327
    SQ5AZP
    Level 33  
    SQ5AZP wrote:
    The power supply is blocked by a malfunction signal.
    Replace the board Z001.


    After all, I wrote at the beginning.
  • #12 16204275
    been1
    Level 14  
    Everything is correct, but with this approach, we will become module changers, not servants or hobbyists.
    In the TV sm they give: replace t-con. And we replace the AS-15 or the 2.5V stabilizer and the tv blows.
    I do not know welders very well although I have already fixed a few.
    As for this, I have not encountered a completely digital control yet, and SM is poor, so it is a problem with repair. For this two-sided printing and it is such that nystagmus goes to get.
    Thank you SQ5AZP for hints.
  • #13 16206169
    SQ5AZP
    Level 33  
    The producer is exactly what this is about. Hence, the lack of device diagrams. As long as the obligation to publish service materials (including detailed conceptual diagrams) was one of the requirements for the release of the product for sale in the customs territory of the EU - there was no problem.
    it was created only when the operation of this provision was not prolonged.
  • #14 16635650
    been1
    Level 14  
    Unfortunately, I could not repair this welder. I close the subject.
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Topic summary

The discussion revolves around a Kemppi Minarc Evo 150 welding machine that fails to power on, with only the neon light in the switch illuminating. The user has measured various components, including diodes and the IGBT module, finding no short circuits, and noted a main capacitor voltage of approximately 310V. The VIPER27H power supply is suspected to be malfunctioning, as it only emits starting impulses without engaging. Suggestions from other users include replacing the Z001 board, checking for faults in digitally controlled circuits, and powering the circuit with external voltages. Despite attempts to troubleshoot and replace the VIPER27H, the issue persists, leading to frustration over the lack of detailed service materials for repair. Ultimately, the user concludes that they could not repair the welder.
Summary generated by the language model.
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