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Discussion Starter #1
Hello,

i'm rebuilding a 1221R curtis controller.

I'm looking for the datasheet of SR4180R 1 diode / motorola....

it's a two plate monuting similar "to220" with rounded diode insered in....

thank's
 

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Take a picture of the part because I can't find it, nor does it seem like a valid Motorola part number (Curtis likes to use Motorola dual-diodes with a common anode).

An example of a valid part number would be MUR1620CTR - the CTR suffix is important is it indicates the rectifier is a Center-Tapped, Reverse configuration.
 

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I think it is about 200V / 40A , but its imposssible in to220 normal case!
Sorry - can't help you. Your original part number is not a valid one for rectifiers; it cross-references to a crystal oscillator.

You will need to be able to determine what the diode is doing in the circuit - is this one of the freewheeling diodes, for example? - and then pick a substitute based on the controller's ratings.

Also, it is quite possible to have a 200V/20A rectifier in a TO-220 package as long as the Vf is less than 1.2V or so and the total thermal resistance from junction to heatsink is less than 3C/W.
 

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Discussion Starter #5
yes it's for free-wheel. and regenerate too.

with 300A of current in max braking ,there are 12 diodes (and no place for more), it need 25A minimum...each:confused:
 

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yes it's for free-wheel. and regenerate too.

with 300A of current in max braking ,there are 12 diodes (and no place for more), it need 25A minimum...each:confused:

I've used the MUR2020R in 1221's (and other early Curti) and they will work, despite a lower 20 amp current rating.
I honestly am not recommending them, but there is simply no other alternative that I am aware of.
These are still available, but probably won't be for long as they are the reverse polarity of their FAR more common cousins.

http://www.onsemi.com/PowerSolutions/product.do?id=MUR2020R

Cheers

Mark
 

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I also have used the MUR2020R sucessfully. I am also working on an idea where I will use TO242 diodes which are not reverse and mount them sideways above the original TO220 location. Then I can use short jumpers from the appropriate leads the board. The only drawback is that they must be insulated from the heatsink. Just an idea.
 

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Discussion Starter #8
Hi for all...

recently , one of sr4180r diod flashed on road...:eek:
diod replaced but curtis desn't works any more...
there was a flash on board next to...
i found a wire conductive on board cutted , an ic lm358out of arder too...
It works on table now , except the "drive" solenoid command who turn off after throttle..!
It's too , i'm powerless in front of this problem without schematic of this card.
It's the card with molex connect and 4 opto's on....
if neither some body as ever work on, i'm interested;

and excuses my poor writing english level!

thank's
 
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