I have managed to integrate the Western Automation RCM14-03 module into the OpenEVSE unit.
This gives AC 30mA and 6mA DC GFCI protection (tested and confirmed). While there are several methods of integrating the module…I wanted to simplify the integration so that DIY builders can easily upgrade their units without having to make modifications to the actual controller board or firmware.
The RCM14-03 gives a ‘HIGH’ output on its [FAULT] pin via a pull-up resistor when leakage is detected.
This [HIGH] signal can be directly coupled to the sensor input (pin 2) on the GFCI connector. The value of the pull-up resistor is selected (1k2) to level shift from 12V operating level to the 5V input of the GFCI detector.
I added an ‘exciter’ coil to the RCM14-03 so that the self tests will run without issue. I also made a custom cable with integrated pull-up resistor so that the module can be fitted easily to the controller board.
I received great support from the R&D department of Western Automation who are the manufacturers of the necessary modules.
Please see pictures attached.
