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ET5410 Electronic Load mod: add external sense

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cybermaus:

--- Quote from: ceut on September 11, 2021, 04:52:53 pm ---I have made a small mod for the (too loud) fan.
I use a lot 40°C Thermal Switch (Normally Open) for many devices which have too loud fan (I don't know the real name of this component).

--- End quote ---

Hmm, that is not a bad idea. Simple enough.
It's just called a thermostat. Probably this model uses a simple bi-metal switch.
Next time I order some stuff I should have some come along.

Can I suggest to you that you put some sort of isolation on the scews for the heat-sinc stands?
They are connected to the Red (+) terminal. One small dent in the side, and you are shorting the latter to ground.
I just put some felt pads between the screws and the sides. It not only isolates, but also helps prevent dents and reduce vibrations.

ceut:

--- Quote from: cybermaus on September 16, 2021, 05:38:08 am ---
--- Quote from: ceut on September 11, 2021, 04:52:53 pm ---I have made a small mod for the (too loud) fan.
I use a lot 40°C Thermal Switch (Normally Open) for many devices which have too loud fan (I don't know the real name of this component).

--- End quote ---

Hmm, that is not a bad idea. Simple enough.
It's just called a thermostat. Probably this model uses a simple bi-metal switch.
Next time I order some stuff I should have some come along.

Can I suggest to you that you put some sort of isolation on the scews for the heat-sinc stands?
They are connected to the Red (+) terminal. One small dent in the side, and you are shorting the latter to ground.
I just put some felt pads between the screws and the sides. It not only isolates, but also helps prevent dents and reduce vibrations.

--- End quote ---


Hello,
Thank you for your great advice !
I have teardowned again my ET5410 because I have received an Arctic F8 fan (airflow=31CFM), to try it inside.

And you are totally right ! :-+ The (+) is on the heatsink  :-\
In fact, it is because there are no thermal isolation pad between the mosfet tabs and the heatsink (maybe the heatsink is a part of the current sinking :-? )
So I have put 2 pieces of ductape on each of the 2 opposites screws.

For the F8 Fan: it is a failure  :-[ the airflow is too low  :-\

I have checked all good PC fan brands (Noctua, Arctic, Coolermaster, Antec, bequiet and other brand) and I can't find any that matches the one inside (I have looked for a 0.35A / 4.2W fan at 4000rpm).
I have ordered a little UT363 to check the airflow, but I'm stuck.

Mine has an horrible metallic noise when it's rotating: I think there is a bad ballbearing inside.
Fortunately the "thermostat" saves me  :-+  (it is a simple bi-metal switch as you say=>there is a very little "clic" like a relay when it is activating)

If someone has an idea to replace the 80mm fan inside ?


Edit: I have ordered a Arctic "P8" version: it is the high static pressure version, to try it...

vav:
Hi, I'm the new owner and I made some adjustments. I placed the
1.USB port on the front panel
2. I added terminals for 4W measurement
3. I added a 2W / 4W switch
English is not my native language, I use a translator.

cybermaus:

--- Quote from: vav on March 15, 2022, 01:08:24 am ---Hi, I'm the new owner and I made some adjustments. I placed the
1.USB port on the front panel
2. I added terminals for 4W measurement
3. I added a 2W / 4W switch
English is not my native language, I use a translator.

--- End quote ---

looks nice.

T3TRIS:
Well, I'm reviving this one, hopefully!
I bought an East Tester ET5410A+ DC load and have been using it for testing LiFePO4 battery builds. It has worked fine so far and has been useful for capacity tests. However, one of these capacity tests is pointing to an issue with battery I made, and I now want to test individual cells. The issue that brings me here is the voltage sense wires. They aren't critical for an assembled battery with BMS but for single cell tests, it's a pain. I had started a 40A load test on one cell, telling the load to stop at 2.5V. However I quickly noticed the 0.5V voltage drop between the cell terminal and the load (using 6AWG cables and crimped lugs).
Anyhow, I now want to do this voltage sense wire mod, but apparently the A+ version of the ET5410 doesn't look friendly to that!

I can solder some wires to banana plugs, but to be honest, finding where to solder on this board seems to be above my pay grade.

Has anyone ever figured this one out?

I also sent an email to East Tester directly to see if they can assist.

Thanks

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