As in the topic, the welder turns on the 15 V power supply, there is no response to the potentiometer. On the forum I found a diagram very similar to my system, but only the main one, I lack the control part, the welding machine has a hot start and anti-stik. My measurements show that I do not...

Take accurate photos of the plates of this welder and blend.

It is possible to replace it in the upper right corner of CA3140.

For a better overview, I have included descriptions of the scalers in the photo. The stabilizers are operational. LM358 with the potentiometer plug replaced, IFRZ24 checked. After removing the plug (bottom right) from the welder's output, the output voltage increases from about 9V to 57V, but the minimum current barely sparks.

Check TL084 - solder the stand there and replace it. Added after 6 [minutes]: A similar topic was raised here:

A good diagram, a good link, if you have a diagram and you can still rummage with tension. I also walked on these Russian sides. The main diagram is identical to this figure only stronger transistors and less. and as for the chip, you mean on the vertical board you have to remove it first.

Check everything carefully here:

Hello, I have a similar problem. The welder always welds at maximum current, no adjustment. On the display, the value of current changes when the potentiometer changes. I checked all voltages according to the diagram below and everything is correct. The question is what else should be checked and measured? Below are photos of the device

After all, the error amplifier circuit must receive a signal from the current transformer! When the transformer is damaged, signal forming elements, paths to op-amp. - the effect will be exactly as described, and the amplifier's voltages will be within 10-15% tolerance! load the output with a 2? / 800W resistor and you can easily feel where the problem lies with the oscilloscope.

Hello, digging up the topic of the welding machine, I have a problem with the welder and I have a burned out transformer on the plate type EEL25 200 12 22 22 CE, looking at the diagram above at my friend, it is a T2 transformer, or someone is able to offer something to replace or solve it in some other way way? because searching for it is only available in Chinese stores

EEL25 are the dimensions of the core, the remaining numbers i.e. 200, 12, 22, 22 are the numbers of turns. The primary winding has 200, feedback is 12, and those after 22 are from +/- 24V. Probably it will be faster to unstick the core and rewind it, or you can put in two 24V power supplies.

MGSI-200 IGBT Magnum Welder: No Response to Potentiometer, Need Control Diagram

bokun 22863 12

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#1 16462919 08 May 2017 12:12

bokun bokun

Level 11

» |

Post #1
16462919 08 May 2017 12:12

As in the topic, the welder turns on the 15 V power supply, there is no response to the potentiometer. On the forum I found a diagram very similar to my system, but only the main one, I lack the control part, the welding machine has a hot start and anti-stik. My measurements show that I do not have voltage for the IGBT control transformer. On the control board, apart from the integrated circuits, there is such a bridge composed of IRFZ24 and IRF9Z24, it is possible that they control the operation of the steering transformer.
Any advice or a diagram of such a welding machine? The board is removed from the heat sinks.
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#2 16463002 08 May 2017 12:53

SQ5AZP SQ5AZP

Level 33

» | Helpful post? (+1)

Post #2
16463002 08 May 2017 12:53

Take accurate photos of the plates of this welder and blend.
#3 16509569 03 Jun 2017 09:22

panstalin2 panstalin2

Level 20

» | Helpful post? (+3)

Post #3
16509569 03 Jun 2017 09:22

It is possible to replace it in the upper right corner of CA3140.
#4 16517913 07 Jun 2017 21:40

bokun bokun

Level 11

» | Topic author Helpful post? (+3)

Post #4
16517913 07 Jun 2017 21:40

For a better overview, I have included descriptions of the scalers in the photo. The stabilizers are operational. LM358 with the potentiometer plug replaced, IFRZ24 checked. After removing the plug (bottom right) from the welder's output, the output voltage increases from about 9V to 57V, but the minimum current barely sparks.
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#5 16518367 08 Jun 2017 08:34

panstalin2 panstalin2

Level 20

» | Positive voted Helpful post? (+7)

Post #5
16518367 08 Jun 2017 08:34

Check TL084 - solder the stand there and replace it.

Added after 6 [minutes]:

A similar topic was raised here: http://valvol.ru/topic2248.html
#6 16519899 08 Jun 2017 21:54

bokun bokun

Level 11

» | Topic author Helpful post? (+2)

Post #6
16519899 08 Jun 2017 21:54

A good diagram, a good link, if you have a diagram and you can still rummage with tension. I also walked on these Russian sides. The main diagram is identical to this figure only stronger transistors and less. and as for the chip, you mean on the vertical board you have to remove it first.
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#7 16520299 09 Jun 2017 08:26

panstalin2 panstalin2

Level 20

» | Positive voted Helpful post? (+18)

Post #7
16520299 09 Jun 2017 08:26

Check everything carefully here:
#8 18644128 24 Apr 2020 18:51

lecho5law lecho5law

Level 8

» | Helpful post? (+2)

Post #8
18644128 24 Apr 2020 18:51

Hello, I have a similar problem. The welder always welds at maximum current, no adjustment.
On the display, the value of current changes when the potentiometer changes.
I checked all voltages according to the diagram below and everything is correct.
The question is what else should be checked and measured?

https://obrazki.elektroda.pl/3415508400_1496903282.jpg
Below are photos of the device

https://obrazki.elektroda.pl/8453558600_1584450081.jpg
https://obrazki.elektroda.pl/1873687000_1584450080.jpg
https://obrazki.elektroda.pl/4164701700_1584450079.jpg
#9 18645494 25 Apr 2020 12:07

SQ5AZP SQ5AZP

Level 33

» | Helpful post? (+1)

Post #9
18645494 25 Apr 2020 12:07

After all, the error amplifier circuit must receive a signal from the current transformer!
When the transformer is damaged, signal forming elements, paths to op-amp. - the effect will be exactly as described, and the amplifier's voltages will be within 10-15% tolerance! load the output with a 2? / 800W resistor and you can easily feel where the problem lies with the oscilloscope.
ADVERTISEMENT
#10 18847488 31 Jul 2020 15:38

Wacko123 Wacko123

Level 2

» | Helpful post? (+1)

Post #10
18847488 31 Jul 2020 15:38

Hello, digging up the topic of the welding machine, I have a problem with the welder and I have a burned out transformer on the plate type EEL25 200 12 22 22 CE, looking at the diagram above at my friend, it is a T2 transformer, or someone is able to offer something to replace or solve it in some other way way? because searching for it is only available in Chinese stores
#11 19158243 04 Jan 2021 12:56

ukixx ukixx

Level 21

» | Helpful post? (0)

Post #11
19158243 04 Jan 2021 12:56

Wacko123 wrote:
Hello, digging up the topic of the welding machine, I have a problem with the welder and I have a burned transformer on the plate type EEL25 200 12 22 22 CE

EEL25 are the dimensions of the core, the remaining numbers i.e. 200, 12, 22, 22 are the numbers of turns. The primary winding has 200, feedback is 12, and those after 22 are from +/- 24V. Probably it will be faster to unstick the core and rewind it, or you can put in two 24V power supplies.
#12 19917073 05 Mar 2022 23:11

Loveths Mannongol Loveths Mannongol

Level 2

Helpful post? (+3)

Post #12
19917073 05 Mar 2022 23:11

bokun wrote:
A good diagram, a good link, if you have a diagram and you can still rummage with tension. I also walked on these Russian sides. The main diagram is identical to this figure only stronger transistors and less. and as for the chip, you mean on the vertical board you have to remove it first.

Sir bokun can you share the full schematic diagram it will be a great help for us.
Looking forward for your kind consideration.
#13 20240277 17 Oct 2022 16:35

hosseinarevan hosseinarevan

Level 7
» | Helpful post? (+2)

Post #13
20240277 17 Oct 2022 16:35

bokun wrote:
As in the topic, the welder turns on the 15 V power supply, there is no response to the potentiometer. On the forum I found a diagram very similar to my system, but only the main part is missing the control part, the welding machine has a hot start and an anti-stick. My measurements show that I do not have voltage for the IGBT control transformer. On the control board, apart from the integrated circuits, there is such a bridge composed of IRFZ24 and IRF9Z24, it is possible that they control the operation of the steering transformer.
Any advice or a diagram of such a welding machine? The board is removed from the heat sinks.

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Topic summary

The discussion revolves around the MGSI-200 IGBT Magnum Welder, which is experiencing a lack of response to the potentiometer despite powering on the 15 V supply. Users suggest checking various components, including the CA3140 and TL084 integrated circuits, and the IRFZ24 and IRF9Z24 transistors that may control the IGBT transformer. One user notes that after disconnecting a plug, the output voltage increased significantly, but the current remained low. Another user highlights the importance of the error amplifier circuit receiving a signal from the current transformer, indicating that a damaged transformer could lead to the described issues. Additionally, there are inquiries about obtaining a full schematic diagram for better troubleshooting.
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MGSI-200 IGBT Magnum Welder: No Response to Potentiometer, Need Control Diagram

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