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Watchmon 4 onboard output
#11
Not fusing as per the schematic, which I assume is their definition of incorrectly, would only have been a problem if you'd made a mistake with the wiring, or connected a hefty fan, and no fuse - or some other issue resulting in a component failure.

I have 3 different systems running using WM4s, I cant remember if that schematic was ever replicated exactly (using a fan) during our initial evaluation - but the switching logic certainly functioned correctly.

Of the 3 slightly differing systems now in operation, 1 WM4 doesn't use either A or B as they failed shorted during testing, probably due to having what seems to be no fly back protection - this was during the shunt locking phase which resulted in shunt trips being triggered whenever a cell went into bypass - all three now have expansion boards, the remaining two whose A and B outputs do still function switch relays or contactors, which in turn are connected to either heating or cooling system - you'll get the gist from this image showing a part finished BMS enclosure.

All of the I/Os are broken out to a separate enclosure which contains the relays and contactors - all of which have external coil protection.



I'm assuming you've checked the fan actually works, and that it's not polarised before connecting it ...... sometimes simple things cause big problems.
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#12
Either fets have fused due to inrush, wires are wrong, the configuration is wrong - post HIGH res photos of every component and a video of every screen on the toolkit and i'm happy to take a look -
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#13
Alrighty ...well according to a response I just got from Jaron, the problem is the DC-DC converter that I am using is too powerful for the Watchmon 4's outputs using the wiring approach on Batrium's website.  He sent that response after I had sent more pictures today as well as checked the output on the Watchmon 4 that I was using for the fans with my multimeter today.  Yes the fet is damaged.  When checking with my multimeter it is constantly supplying the switched ground.  Which is why the fans are always on no matter what the Watchmon toolkit control logic instructs.

I did not realize the criteria on the dc-dc converter, especially since the outputs on the Watchmon 4 were just switching ground on/off for the Dc-Dc converter.  In fact the Dc-Dc converter that I chose has the same specs (and probably made in the same Chinese plant) that is in the Batrium video on installing fans without the expansion board.  The dc-dc converter itself never supplied voltage to the Watchmon supply rails.  That was either provided by the USB connection or the battery itself (with that 2 amp fuse in line when that was the case).  Of note is there is no specification regarding choice of DC-DC converter in Batrium's instructions on wiring up fans to the outputs.  So I picked an inexpensive Dc-Dc converter with plenty of headroom for what I am using right now (4 fans that draw .2A each) and possible future expansion if needed.  And again it is the same one that is in Batrium's video for this application.  However, I chose the wiring approach that is on Batrium's web site instead of the one in the video  because I wanted hook up a 48V shunt trip breaker to the other output.  This is different then the approach that is in the video.   So lesson learned regarding this and hopefully this will be helpful to others in the future.  I am waiting for Jaron's response on how we will proceed on this,  

BTW ...for future reference, since I am not going to be posting video's to Youtube with these efforts at this time ...is there a way to post a video only on this forum?  Or does it have to embedded on a site like Youtube?

Thanks as always,

Richard
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#14
And ur sure you havent burnt the mosfet? I see mention of DC/DC? Their inrush currents can easily blow it up

Edit: I responded when there were new responds so most likely ignore this response for now...
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#15
A timely reply from Jaron and a plausible explanation.

Headrc - Batrium mistakenly sent a 12v expansion board to us many moon ago, if you want it you can have it - PM me if it'll be of any use.

(07-15-2019, 07:48 PM)kevinjaye Wrote: Can anyone help me with the onboard mosfet output on the watch mon 4?
I connected a fan to output A on the watchmon based on the info provided  on the batrium site however when I set the output to manually on nothing happens same thing with output B. The software shows the on indicator but nothing at the terminals.



Just Kevin's issue to solve now - which wont be in rush related.
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#16
Sean ...that is a generous offer from you.  Checking this morning for a response from Jaron did not turn up anything, and due to the different time zones it will be at least another 8 hours before I hear anything.   I would like to see what Batrium is going to do regarding this before I impose on you.  I do not feel negligent regarding this issue considering all the information/instruction available for this application was followed. I put a lot of effort in studying that information and then a lot of time going back and forth with Batrium regarding the problem.  

This once again emphasizes the need for an organized detailed manual from Batrium.  One which would specify things like ...do not use a Dc-Dc converter of the like that I used for this application.  It would be good insurance against Batrium's limited resources and help customers avoid time consuming mistakes.  

Thanks, 

Richard
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#17
(07-17-2019, 02:39 PM)Headrc Wrote: This once again emphasizes the need for an organized detailed manual from Batrium.  One which would specify things like ...do not use a Dc-Dc converter of the like that I used for this application.  It would be good insurance against Batrium's limited resources and help customers avoid time consuming mistakes.  

Thanks, 

Richard

In Batriums defence they do mention the A & B outputs switching capabilities, which from memory is 4A and 8A surge (but no surge duration) ? - but it might be of interest to clarify either via the converters spec, or by experiment what the actual surge is. I've managed to kill both on one of mine, I think I've mentioned how previously - hence my now rather retro use of mechanical relays, switched by the onboard FETs

I'll find the 12v expansion before the end of the week have see how the FETs are configured, it's yours if you need it.
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#18
Headrc you cannot write a manual stating what not to do... That list would be lobg
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#19
Ok I agree on that ...but maybe then a specification for the proper DC-DC converter ....and again the one I used was exactly the same as the one in the demonstration video.
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#20
I've now watched closely the Batrium how to video illustrating the method of using the supervisors onboard FETs to feed the DC to DC to the fan - I've attached a screenshot, and the Batrium schematic.

I now know why folks are killing their FETs (this is not how mine died)

Anyone else see the difference ?





Again in Batriums defence, they have quoted the FET switching specs

but ...... etc etc
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