mep 003 AVR PINOUT

[bmchauvette]

MEP. 003A.VR. Pinout. my generator was putting ouT power until one day it just stopped for no apparent reason

I believe my helper installed the Avr board Incorrectly. So I must do a pin out to trace the wires. I don't think the schematic is correct. I am working off the schematic in TM. 5-6115-585. Dash 34. Change #5. Terminals one, two, and three are jumped together. 8&9 are also jumped, but I don't have any Jumpers on my board also My board is fully populated (no unused terminals). However, terminal 6&7 Is not used on the schematic.

I am going to use a tone tracer To check out the installation. Any pointers? I noticed that three of the six rotating diodes are reverse-biased (Noted on the schematic). Can I read the printing on the old diodes to tell which ones are reversed? Or how can I tell which ones are reversed bias? Do the diodes need to be disconnected to test? Is it safe to assume diodes of a higher voltage and current rating are OK to use?

 

[Scoobyshep]

MEP. 003A.VR. Pinout. my generator was putting ouT power until one day it just stopped for no apparent reason

I believe my helper installed the Avr board Incorrectly. So I must do a pin out to trace the wires. I don't think the schematic is correct. I am working off the schematic in TM. 5-6115-585. Dash 34. Change #5. Terminals one, two, and three are jumped together. 8&9 are also jumped, but I don't have any Jumpers on my board also My board is fully populated (no unused terminals). However, terminal 6&7 Is not used on the schematic.

I am going to use a tone tracer To check out the installation. Any pointers? I noticed that three of the six rotating diodes are reverse-biased (Noted on the schematic). Can I read the printing on the old diodes to tell which ones are reversed? Or how can I tell which ones are reversed bias? Do the diodes need to be disconnected to test? Is it safe to assume diodes of a higher voltage and current rating are OK to use?

Higher rated diodes are ok to use. They need disconnected to test as the reversed bias ones will not give you usable results.

Sent from my SM-S908U using Tapatalk

 

[Ray70]

Can you send a picture of your VR wiring?
There should be stainless steel jumper bars ( barely visible unless you look closely ) jumping screws 1,2,3 and 8,9 ( with a wire on 8 but not 9 )
Then you should have individual wires on 10-18
So 1-7 and 9 should all be empty screws.
If you have wires on every screw something has been altered!

 

[Guyfang]

Also keep in mind, there is an old and new style ACVR. So yes, send pictures, of both the old and new ACVR.

 

[Guyfang]

The schematic in the TM is right. The schematic on the gen set is often out of date, but the one in the TM is all you need.

 

[kloppk]

The two versions of the ACVR are very similar. Just a couple of zener diodes added to the newer design as I recall.

 

[Triple Jim]

Terminals 4 and 5 should also be jumpered together. So that's:

1-2-3
4-5
8-9

Missing jumpers won't prevent the generator from producing power though. It affects how well the generator responds to changing loads.

 

[Guyfang]

By old and new, I meant, one was for the 60 hertz model, and the 400 hertz model, they were the first versions. Then came the new regulator that was for both the 60 and 400 hertz. Simply a matter of moving the wires/jumper around. I would think the first version would be about impossible to find now a days. But you never know.

 

[bmchauvette]

Also keep in mind, there is an old and new style ACVR. So yes, send pictures, of both the old and new ACVR.

will do may take a while

 

[Triple Jim]

Of the two I've worked with, the older one is 72-5020 and the newer one is 72-5338. Those numbers are printed the boards. There is no significant difference between the two, but the layout is a little different. Both use jumpers to configure them for 60Hz or 400Hz use.

 

[bmchauvette]

will do may take a while

 

[Triple Jim]

That new one was made my me some time ago, as an aftermarket replacement with some improvements. I made several hundred of those before I retired last year. I designed the board so that it was configured for 60Hz operation without needing any jumpers, and I eliminated the unused terminals.

 

[Ray70]

Well that explains a lot! I think we were all assuming you had an OEM regulator!
That's what we get for making ass-umptions.

 

[Chainbreaker]

Also... maybe I'm reading this thread wrong... but there are other places/components/connections that could have issues that can trigger No AC output as you mentioned as the initial issue you experienced.

Some things that come to mind are within the "AC Reconnection Box", "Control Panel" - transformers, intermittent "wiring connections", etc.

You mentioned: "I believe my helper installed the Avr board Incorrectly". Was this a new board, or one that was already installed that had been removed to troubleshoot or what?

BTW, I have one of Triple Jim's AVR's installed on my #1 genset & it has been rock-solid.

 

[Guyfang]

Well that explains a lot! I think we were all assuming you had an OEM regulator!
That's what we get for making ass-umptions.


Well, really, I also assume someone should tell us that.