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Old 04-12-2012, 04:39 AM
jimmy meade jimmy meade is offline
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Default MPM 7/250CX Welder Genset make

Hallo from Ireland
I have the above welder
The output to the 3phase diodeset has 6 wires 3 go directly to
3phase bridge the other 3 go to 0.47ohm resistors then to another
3phase bridge the + and- of these bridges are commoned
why this circuit
Thanks
Jimmy Meade
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  #2  
Old 04-12-2012, 09:20 AM
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terry lingle terry lingle is offline
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Welcome to the SFT experience
It would be easier to comment on the construction if you could post a link to the manual or a picture of the schematic diagram.

From your description it seems that the diodes/heatsinks are a little marginal so they put in a second set with a current sharing scheme rather than use a higher capacity diode/heatsink.
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Old 04-12-2012, 12:38 PM
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H80N H80N is offline
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Quote:
Originally Posted by jimmy meade View Post
Hallo from Ireland
I have the above welder
The output to the 3phase diodeset has 6 wires 3 go directly to
3phase bridge the other 3 go to 0.47ohm resistors then to another
3phase bridge the + and- of these bridges are commoned
why this circuit
Thanks
Jimmy Meade
I found this data sheet but not a tech manual...

http://www.genset.co.uk/wp-content/u...50-I_DR_AE.pdf

and a tech contact link to the distributor/mfg??/importer??

http://www.genset.co.uk/technical-help/
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Last edited by H80N; 04-12-2012 at 12:46 PM.
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Old 04-12-2012, 01:13 PM
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RancherBill RancherBill is offline
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Quote:
Originally Posted by terry lingle View Post
From your description it seems that the diodes/heatsinks are a little marginal so they put in a second set with a current sharing scheme rather than use a higher capacity diode/heatsink.
+1

Can you hand draw the circuit with part numbers. IIRC the resistors are so one set does not 'race' (sharing)

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Old 04-13-2012, 03:42 AM
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GWIZ GWIZ is offline
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Quote:
Originally Posted by jimmy meade View Post
Hallo from Ireland
I have the above welder
The output to the 3phase diodeset has 6 wires 3 go directly to
3phase bridge the other 3 go to 0.47ohm resistors then to another
3phase bridge the + and- of these bridges are commoned
why this circuit
Thanks
Jimmy Meade
I'm not sure how to say it from what you are saying.

When you have a 3 phase bridge used to change AC to DC, you have the "THREE INPUT" lines (not output lines as you are saying)
And the two DC output lines.

More then likely you have Three lines feeding AC to one set then jumped to feed AC to another three phase bridge. powering more then one bridge.
one bridge may power the high current and the other for control boards.


"why this circuit"
Its not uncommon to tie the + from one supply to the - on another supply and using that as a common for other circuits.
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