Invertec 140S

[amudsen]

Stie cineva daca zenerele D15 din grila igbt sunt aceleasi ca in versiunea v160? Adica 1N4749A, 

si condensatorul C7 de pe iesire cam ce valoare ar avea?

 

Nu imi place forma semnalului din grila si nici de la iesire, cand pun rezistenta de sarcina, semnalul de pe grila se mareste considerabil.

Multumesc.

Editat Iunie 25, 2014 de amudsen

[nickrvl]

D15 - 1N4148

C7 - 4,7nF/4kV

[amudsen]

Multumesc nickrvl, totusi nu sunt niste zenere in grila igbt-urilor asa cum are fratele mai mare v160?

[nickrvl]

Nu, acest model nu are.

[amudsen]

Cred ca ar fi util......... sa aiba,  dupa modelul celui de la 160s. 

[mmihai94]

Care e rolul rezistentelor din pozele de mai jos? Fac parte dintr-un snubber? Ce tensiune ar trebui sa fie pe ele? sau nu ar trebui sa fie?

 

https://drive.google.com/open?id=1WMLyUJ4MYvsYp9pVkuRQeQZmL0DpxYV5Iw

 

Initial am crezut ca sunt pentru softstart, dar nu e asa. Pusesem un bec in locul lor si se aprindea normal, aveam 200V pe el, dar invertorul pare ca functiona, aveam 45V la iesire. Imi e frica sa il pornesc cu rezistentelel alea, care s-au copt la propriu.

 

https://drive.google.com/open?id=0B6ENA_LEM4-YeGNibXpULUlsVzA

[amudsen]

De la snubber, eu pur si simplu le-am inlocuit cu unele de putere mai mare si le-am distantat un pic fata de placa astfel incat sa aiba un airflow (e posibil sa trebuiasca sa schimbi puntea redresoare si condensatorii - eu asa am facut). Invertoarele din versiunile anterioare aveau 4 rezistoare in paralel (v100 si v130).Eu m-am chinuit cu traful de curent, pana la urma am scris la firma din Italia si mi-au trimis pur si simplu unul. Foarte bun invertorul (desi ar fi loc de imbunatatiri), eu il folosesc ocazional, de fiecare data cand il folosesc ii multumesc lui @cyprian pentru ajutorul dat.

[Vizitator welder]

Hi dear technicians. Does anyone have a wiring/circuit diagram of PWM module at Invertec V140-S? Sеveral weeks ago i receive this inverter with completely burnt out power module - six IGBT's (HGTP12N60) and two diodes (STTH12R06) has destroyed. Now I has finish with recover them and the gate pulses are correct, but ... When try to ignite arc the welding current is extremely high (around 150...155 A!) and no output current control from potentiometer. The potentiometer, output current sensor (shunt) and 8-wire cable between front control board and inverter board are correct. Something in PWM module make me crazy. In first place the device has previous attempts to repair from someone else and I'm not 100% sure in IC component type and placing: U1=LM324N, U2=LM393N, U3=TDA1060, U4=LM324N and U5=LM358N. That's correct? And second - the original resistor (R48) in red circle position is completely crumbles to pieces from rust and colour code are missing. I try to measure his remains and got as result around 220k. Also replaced, but again no 100% sure in this value! The IC's nr. 1, 2, 4 and 5 has also replaced (easy, adaptor socket), but no difference in problem status. The diodes and transistors in module is measured too and not damaged. I suspect R48 is with incorrect value, but no circuit diagram of PWM module. Does anyone have any high resolution photo of this PWM module or schematic diagram with component values?

​PS: I have service manual.
Thank's in advance!

[Vizitator welder]

The U1 has been previously replaced from other technicians with LM324. This is wrong or fraud, I don't know exactly, but after some pinout and circuit researches - the right integrated circuit at this place is LM339! This was proved later from em2006 technical documents too. The device is fixed more than year ago and working flawlessly.

[em2006]

... This was proved later from em2006 technical documents too. The device is fixed more than year ago and working flawlessly.

 

Hello, welder,

I saw your post on V140 right now, because in 2017 I missed all of the electronics forums. I have suffered an acute myocardial infarction with cardiac arrest and multiple complications (January 9,2017).

Now, after 1 year of hospitalizations, I came back here.

Before 2017 I posted on my website the V140 article specifically for you, as we saw your request on Volodin's forum - valvol.ru.

Unfortunately, I have not been able to tell you about it because, due to health problems, I have interrupted my correspondence with you.

Now I'm glad that the article was useful.

I appreciate your tenacity in addressing the debugging of professional welding inverters and I hope you will share your experience on the Romanian forums as well.