the snooper
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If you can find out the specs you may be able to get a bolt in replacement
- Thread starter mattylandrover
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mattylandrover
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ive tried to pull the knackard one out but its just breaking up - the diodes on the opposite plate to the one with the brocken diode seem to sit slightly prouder and i think i can read the number 28819547 but they seem to test the opposite way round with the multi-meter or are they the same diode just fitted the opposite way round
the snooper
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that number doesn't come back to anything in a search, as long as the diodes tests good that's all you are looking for, maybe miller have just configured them that way
Seadog
Save the planet. It's the only one with rum!
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They are the same diode, however they're constructed so that the polarity is opposite, one to the other. In physical terms it means that if you get a reading on one set with the positive lead connected to the alloy heat sink then, for the other set, you will need to connect the negative to the heat sink for a similar reading.
mattylandrover
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the snooper
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now the hard part, finding one
mattylandrover
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yeah i was thinking just as much - the welder was originally supplied by grahams machinery in chester and looking on there website they do welder repairs so i might give them a bell tomorrow on the off chance they can locate one
WorkshopChris
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Have a good look if its just got hot in use then its fine but if it has got hot enough to burn the insulating lacquer of on the edge it should hopefully still be ok. BUT if the insulation has burned you will need to keep on top of regularly tacking the side off and blowing the rubbish out as it will be more susceptible to flashing over and shorting. Looks like your no the right tracks with the diodes.
Don't know what everyone else thinks but you're obviously going to need replacements and personally diodes should be replaced as a matched set not just the 1 damaged one, in your configuration would be looking to replace as a set of 4.
mike 109444
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One place to try for your diode might be a car/lorry alternator repair place as they are very similar to some used in them. Try and find a place with an old boy working there and show him the plate and see what he might have.
500e
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https://www.millerwelds.com/files/owners-manuals/O188414C_MIL.pdf
If you can find Ser No go to site & it asks for Ser no & model Miller the best tech help on web
If you can find Ser No go to site & it asks for Ser no & model Miller the best tech help on web
mattylandrover
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the model is a 241 compactblu and ive tried searching the miller page for that model and i cant find it and nor does it find the serial number - the closest one on the miller site is called integra 241 .
The welder has a badge on the side saying supplied by grahams machinery chester so today i took a trip there armed with the rectifier and all details off the welder - managed to get a really helpfull guy out the workshop who went through all there old parts books and eventualy found the original manual from 1996 for the welder and then had a phone round suppliers but no joy but he did say he thinks he should be able to get a complete rectifier and ive left him my number and he is going to give me a call tomorrow to let me know if he can and how much
The welder has a badge on the side saying supplied by grahams machinery chester so today i took a trip there armed with the rectifier and all details off the welder - managed to get a really helpfull guy out the workshop who went through all there old parts books and eventualy found the original manual from 1996 for the welder and then had a phone round suppliers but no joy but he did say he thinks he should be able to get a complete rectifier and ive left him my number and he is going to give me a call tomorrow to let me know if he can and how much
the snooper
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hope it doesn't cost you an arm and a leg its hard to weld with one of each missing
mattylandrover
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im right handed and have a auto darkening helmet so as long as it only costs my left arm i should be ok ..... from looking on the internet and other people who have had to buy similer rectifiers for other welders i dont think im going to get much change from £200 and thats if they can get one
the snooper
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I would be looking at getting the amperage of the diodes and buy some new ones and save some cash I would imagine they are in banks of four so they will handle the power between them
mattylandrover
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this might make no sense because i dont really know what im talking about but if i replaced all the diodes with ones that are bigger / higher rating than the ones fitted would that work or do they have to be a exact mach for the old ones
the snooper
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higher ratings are fine, all you need to do is find a supplier and speak to them tell them the spec of the machine then they can advise if they have match, bolt in would be ideal
mattylandrover
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yeah i have noticed them bolt in ones with tail wires coming off and they do look like they could easily enough be retro fitted into the rectifier so looks like thats my next route if they cant get a new rectifier or want daft money for one
the snooper
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you could build a complete new rectifier, only 2 ally plates
Jim Davey
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230 Amp Full wave rectifier, 2 bolt fixing, Plate length 200L x 100 W x 75H £71.00 inc VAT
290 Amp Full wave rectifier, 2 bolt fixing, Plate length 200L x 100 W x 75H £86.00 inc VAT
£10.00 P&P you might have to drill new mounting holes and extend wires but pretty straightforward stuff if you have the time.
290 Amp Full wave rectifier, 2 bolt fixing, Plate length 200L x 100 W x 75H £86.00 inc VAT
£10.00 P&P you might have to drill new mounting holes and extend wires but pretty straightforward stuff if you have the time.
the snooper
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96 quid and your back in business
