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Antonius Teja
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Join Date: Sep 2015
Posts: 5

Marelli AVR M40FA640A Blown Fuse

09/13/2015 3:35 AM

Hello,

Good day.

I have purchased 10 AVR M40FA640A from China and imported it to Jakarta.

At first when I installed it in my Marelli model MJB, it worked perfectly. However, when I insert a slight load such as turning on all the lights, the fuse just blown.

I have changed the fuse 5x and it still does the same thing.. All the cables were correctly installed and I was also assured by some of the local engineers.

Finally, I decided to change the AVR to a new one (from the same China manufacturer) and it does the same thing.

After the third replacement, only then it works..

I would like to know what is the cause of the blown fuse in my AVR?

Could it be there is too much current running? Too high voltage or amp?

I am not an expert myself and would like to receive any advice or recommendation from anyone...

Is there any ways to fix this? Or is it possibly that I have been ripped off by China AVR manufacturer?

Please help..

Regards,

Antonius
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Pathfinder Tags: avr regulator electrical engineering marelli
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JohnDG
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#1

Re: Marelli AVR M40FA640A blown fuse

09/13/2015 7:31 AM

Is the correct type of fuse fitted (time delay (AKA anti-surge) rather than fast-acting)?

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Antonius Teja
Member

Join Date: Sep 2015
Posts: 5
#2
In reply to #1

Re: Marelli AVR M40FA640A blown fuse

09/13/2015 8:00 AM

Yes. It is the standard fuse for Marelli AVR M40FA640A
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SolarEagle
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Location: by the beach in Florida
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#3

Re: Marelli AVR M40FA640A blown fuse

09/13/2015 1:16 PM

You seem to be experiencing instability light load which is common....You can adjust the parameters accordingly....check your users manual or check link below...You might try slower loading or incremental loading, waiting for generator to stabilize in between...

http://www.mase.no/cart/images/File/Bruksannvisninger-GB/SIN.UM.018.3.pdf

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Antonius Teja
Member

Join Date: Sep 2015
Posts: 5
#4
In reply to #3

Re: Marelli AVR M40FA640A blown fuse

09/14/2015 3:07 AM

I have tried increasing the load slowly and the fuse still blown. Still have no idea what is wrong. I think it might have something to do with the regulator.
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redfred
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Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

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#5

Re: Marelli AVR M40FA640A Blown Fuse

09/14/2015 9:37 AM

Did you measure the current running flowing through this fuse before and when the lights were turned ON? This will identify if you have defective fuses or if the fuses are doing their job properly.

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Antonius Teja
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Join Date: Sep 2015
Posts: 5
#7
In reply to #5

Re: Marelli AVR M40FA640A Blown Fuse

09/14/2015 12:36 PM

The fuses are definitely working because I tested it on original AVR from Marelli itself and it works... So I guess the problem lies with the China AVR itself...
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redfred
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#9
In reply to #7

Re: Marelli AVR M40FA640A Blown Fuse

09/14/2015 2:10 PM

So I guess you didn't measure the current.

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vsar
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Join Date: May 2010
Location: Metro.Manila, Philippines.
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#6

Re: Marelli AVR M40FA640A Blown Fuse

09/14/2015 9:41 AM

Since your AVR was made in China, it is very possible the reason why it's blowing the fuse is you are putting too much load on the unit!

It is possible that the AVR power handling capacity has been over-rated! Either due to improper design, use of sub standard materials or both!

What you can do is replace the blown fuse with a same rated amperage but use the slo-blow type... Once the AVR is powered, slowly add or turn on your initial load, doing it incrementally at the beginning while observing the results of your test! Use resistive loads like incandescent lamps for testing...avoid using any motor driven loads! Good luck!

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Antonius Teja
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Posts: 5
#8
In reply to #6

Re: Marelli AVR M40FA640A Blown Fuse

09/14/2015 12:45 PM

I guess its just because of bad capacitors being built in to the regulator...

The Marelli Generator are actually attached to Mitsubishi 8DC11. I use it to generate electricity.

Whenever I pull the handle to speed up the diesel engine, the fuse in the Avr just blown.

Is this a common occurrence?
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SolarEagle
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#10
In reply to #8

Re: Marelli AVR M40FA640A Blown Fuse

09/14/2015 5:06 PM

I think maybe you have the wrong type of avr control for your setup....

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DodgySolenoid
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Join Date: Sep 2013
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#11

Re: Marelli AVR M40FA640A Blown Fuse

09/15/2015 3:50 AM

ATTENTION!

: it is not advisable to have the generator operating loaded when the frequency (speed) is below the rated

value: this kind of operation is an overload for the whole generator excitation system.
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Users who posted comments:

Antonius Teja (4); DodgySolenoid (1); JohnDG (1); redfred (2); SolarEagle (2); vsar (1)

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