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| ET5410 Electronic Load mod: add external sense |
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| Algasman:
I found the pictures from my mod. They were still on my camera. Trying to get the pics inline does not work (maybe its a Safari iPad issue). The first three pictures are taken before the modification and show the controller board attached to the front panel and the original wireing. One can see the power lines and the thin black & white sense lines |
| Algasman:
Right above the relay is the connector for the sense signals. I ordered some decent Hirschmann Terminals. The big ones are 63A rated. |
| Algasman:
Now to the mod: It’s quite easy, since the front panel is the same for the two channel version. So the positions for the sense terminals are defined. Just some drilling and filing necessary. |
| Algasman:
The new sense wires soldering and mounted to terminals. All terminals mounted. The main lines are unaltered, just the old sense wires are cut. The modification is really simple. I did not use a switch, just have to put a bracket between the terminals if I use it without external sensing |
| cybermaus:
--- Quote from: Algasman on April 16, 2021, 06:55:09 pm ---The new sense wires soldering and mounted to terminals. All terminals mounted. The main lines are unaltered, just the old sense wires are cut. The modification is really simple. I did not use a switch, just have to put a bracket between the terminals if I use it without external sensing --- End quote --- Brackets may be as good as my switch. I hope the switch will not have contact corrosion in a few years. More importantly, you did also not think to add polarity protection" --- Quote ---Alas no reverse polarity protection on the now separate sense wires, I am now wondering if I should have shorted the middle of the 4 100K resistors with a diode. After all, the TL072 can only stand -0.3V --- End quote --- I think a diode, with it's 0.6V threshold placed strategically in the middle of that 4x 100K network, would not at all affect precision, but if I accidentally cross the sense wires, it would deflect the negative voltage before it reaches the TL072. But I did not take any action on it yet. |
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