MEP-802 and 803 Main generator tip.

[Korgoth1]

I found IN5404 diodes in mine, not IN5406?

 

[Korgoth1]

I wonder if newer model came with 5406 and older ones had 5404 like mine?

 

[MusgroveM]

I know it's been a few weeks, but I just got this information today. Here is a link to an AVR that is supposed to work when the quad windings were burned out by a faulty voltage regulator. https://www.flightsystems.com/standby-generator-ats-controls/model-808-basler-delco-regulator.html It's called a MODIFIED 808 universal voltage regulator. Not exactly cheap,($275) but it's a lot cheaper than replacing the stater. Engineer told me that he has successfully replaced the military voltage regulator with quad windings burned out. You will need to contact them and let them know what you are doing so they can modify it to fit your needs.
I can't find any indication that the SX460 AVR has ever been used to replace the voltage regulator in the 802A or the 803A

 

[biz]

I'm new here but it seems to me this should be a sticky post up top. The fuse and MOV mod seem to be pretty important.

 

[Dwnorton1]

The circular blue disc is a MOV that I added to prevent the voltage spikes that can take out the diode bridge in the voltage regulator.[/QUOTE]
If you are looking for MOV, you're local RadioShack may have them in stock. Mine did. My 802 had Tier 2 in 2012 so fuse was there, but after reading this helpful tip above I was able to again extra protection as well. Picture shows part #. I crimped on pin ferrule on to ensure good connection.




FYI. They cost $2.70 ea. Cheap insurance.
Radioshack states direct replacement for V130LA20A

http://www.mouser.com/ds/2/240/littelfuse_mov_la-299842.pdf

 

[NormB]

I found IN5404 diodes in mine, not IN5406?

5406s have slightly better peak voltage handling and blocking (i.e. - less likely to sacrifice itself for transient, non-harmful voltage spikes).

See PDF attached.

I had some MOVs (V14201U) on hand from another project and will get one installed this afternoon when it gets into the 40s outside.

View attachment 1n5404 5406 diodes MEP802 generator.pdf

 

[Dwnorton1]

Now I am wondering about my MOV rating. What would be the maximum spike that the diode bridge could be exposed to?

 

[NormB]

Now I am wondering about my MOV rating. What would be the maximum spike that the diode bridge could be exposed to?

Good question. I'm not an electronics tech - but I've build and rebuilt a few ham radios and amps over the years among other projects. I can read circuit tracings and troubleshoot and solder with the best of 'em, but I think you might want to direct that question to Guyfang, he's a generator guy.

I had placed these on the input side of the RFI filter on an amplifier - I run power conditioners for my computers and TV/audio system at home. Power spikes on our home lines and OVERvoltage are legendary (try 135 VAC - shut down everything, fried some wall wart, but 122-127 is about normal) and don't even ask about why BGE doesn't fix the problem.

Anyway, I think what you've got is probably fine, I just used what I had on hand.

Norm

 

[Bmxenbrett]

I was able to find the MOV at a local radioshack that was closing down today. I got two of them for less than $1. The fuse and holder i ordered online from allfuses.com
I want to say i have less than $22 into this modification.

 

[DieselAddict]

Nice job!

 

[Guyfang]

Looking good.

 

[Daybreak]

Howdy,
A very important thing to make sure it is done on your generator.

 

[Bmxenbrett]

Since i have done my fuse mod i came across time delay fuses at my local home depot. No 3amp but im sure you can site to store ship it. No need to pay $30 a fuse. They had them for $13 for two.

 

[TrailLifeBill]

Amazon has FNQ-R-3 fuses for $5.45 shipped.

 

[rogpike]

Good post. I just looked and my 2007 803a does not have the fuse mod on it. So what is the best source for the fuse and fuse holder that you have found?

 

[lonesouth]

got mine on amazon.

 

[rogpike]

Thanks, just ordered the fuses and fuse holder from allfuses.com

I will order the diodes from Amazon.

 

[Daybreak]

Howdy,

It is also all spelled out in the Reset TB

Military MEP generator reset information on PDF page 29

 

[Jigawatts]

I am trying to find the specs for the MOV. I tried viewing the manual in post #4 but it isn't working? The MOV's that some of you have listed as using in your units have different specs? Some higher and some much lower voltages? Please forgive my confusion I'm just trying to make sure I'm actually protecting the quad with the MOV and it isn't simply decorative!

 

[Zed254]

Post 15: https://www.steelsoldiers.com/showthread.php?148791-MEP-802-and-803-Main-generator-tip/page2