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MEP-16A Rotating Diode?


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Old 08-18-2008, 07:40:35 PM
K D Redd K D Redd is offline
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Default MEP-16A Rotating Diode?

I finally got the MEP-16A, that had taken up residence in my pick-up bed, removed from the truck bed and dis-assemblied to find what was it's problem NOT carrying a full load. I found one of the rotating diode shorted. Thank to whoever suggested I check them.
Now the question, what rating of diode should I replace them, I am going to replace all three even though only one is bad. The diodes are a DO-4 package, 10-32 stud with the cathode on the stud but what PIV/PRV and forward current. The current can not be that high as the wire connected to the diode post is 18 gauge at best. I am thinking 100 volt PIV/PRV and 6 amps forward current. Or should I use 12 amp forward current diode?
There are NO visible numbers on the old diode.
Kent
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Old 08-18-2008, 07:58:52 PM
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Talking Re: MEP-16A Rotating Diode?

If it was "Me", I would look for the same Diode Package, in the Selection
Guide, and pick the Highest Amp Rating, with the highest PIV Rating, that
is made in the same package. The wieght will always be the same and they
are usually set equideistant around the Armature for balance anyway.
The cost of the Diode is way less than the time it will take to replace one
again, should your guess on the spec's be a bit under what the system
requires.
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Bruce in alaska
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Old 08-18-2008, 09:44:17 PM
K D Redd K D Redd is offline
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Default Re: MEP-16A Rotating Diode?

I can go up to 20 amp 1000 PIV/PRV but I think both of these values are a little OVERKILL. What little experiance I have with generators of this size it seems as if most use a 24 volt field voltage. This being a brushless unit there is not way to measure though. I returned a 20 KW Generac to operation and it had a 24 volt field voltage. I think I will use 200 PIV/PRV 12 amp diodes.

Kent
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Old 08-19-2008, 12:19:28 AM
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Jim McIntyre Jim McIntyre is offline
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Default Re: MEP-16A Rotating Diode?

Quote:
Originally Posted by K D Redd View Post
I can go up to 20 amp 1000 PIV/PRV but I think both of these values are a little OVERKILL....I think I will use 200 PIV/PRV 12 amp diodes.

Nah, go with the 100V 6A diode. You'll save a few bucks. What could possibly go wrong?

(For the record, I agree w/Bruce, BTW. Use the beefiest DO-4 you can get)
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