I can't use a current monitor as this would only detect while running
And, for the case when the pumps are not running, it is possible for the source side to be disconnected, so that some other system can be inserted...such as low current system....a system that injects some level current. If we know that there is to be return current, then a device will monitor return current. If that return current disappears, then it could mean that the line is cut.
Such as a capacitor and voltmeter perhaps ? And before someone says a voltmeter doesn't measure current, they actually work on the basis of low current measurement.
Yes, I also understand this may not be feasible at all. This was just an idea from a real farmer, that we wanted to develop and maybe turn into a comercial product if viableThanks
The original idea was to develop a system that can coexist with the VFD at the same time, be tolerant to the voltage of spikes generated in the system while running, and be able to detect a cut wire when not running, but without the need to engage/disengage devices from the line.