I finally got my 3-phase 40A relays and hooked it up to see if it worked.
It works, but it seems the load is to high for the EVSE board. My multimeter is showing me that the relays is using about 450mA, while the board is designed for 300mA, correct?
The big black thing labeled "MPD D107E" gets warm and starts to make a "sissing" noise.
Next to the relays connection there is a 12V/GND connection on the board. What is the maximum load for that? If that can handle the 450mA better I'll probably buy a small relays in between to switch on the big relays.
450ma @ 12V (5.4W) is far too much. The OpenEVSE Power supply is only 4W. The OpenEVSE board and Adafruit LCD use less than 1.5w leaving more than 2.5w for the relay... The D107E is he DC/DC converter for the pilot. It is probibly getting hot due to a voltage drop when the relay kicks in... Is your relay avaliable with a 230v coil? You can use a much smaller relay to switch 230V to your 3 phase relay and stay within the 4W.
Model S #P1089
The 230V version is also much more expensive.
I think I'll take a doorbell transformer which outputs 12V 1A and use a small relay to use the doorbell transformer to turn on the big relay.
12V doorbell transformer ----> Relay connected to EVSE ----> Big relay
Try one of these :
small solidstate relais 12V DC IN -> 48V DC 0,5A out
Model S EU P10 / Model X EU P9 ......... ZOE #47
Just an FYI, OpenEVSE released new firmware that allows setting the pilot amperage via a 1 button menu system, viewed on a 2X16 RGB LCD display, see the homepage for pictures: http://code.google.com/p/open-evse/
Also in the news Leviton is now selling 30A J-1772 cable, 25' long for $126, this has brought down the price of building a 30A portable OpenEVSE to a little over $400, see my build link below, which has been updated with the new lower cost Leviton J-1772 cable: http://code.google.com/p/open-evse/w...SE_by_mwolrich
My own EVSE is done! I started this effort before I was aware of the open EVSE project; however I decided to continue with my own design mostly for my own education. While the J1772 part itself was fairly strait forward, the GFCI, was another matter...
I can confirm that off the shelf GFCI "donut" modules designed for hot tubs do not work with the Roadster! The unit I bought did provide a nice coil that I ended up using with my own circuit.
I put all my design notes (including schematic and source code) in one document here: J1172 Design Notes - Google Docs
Here is a picture of the finished unit:
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