I think I may understand what's happening here but it's just a theory. Here's the scenario...
I have a logic gate sensing when a 1/2hp 120V AC motor turns on. To get the 5Vdc logic signal (that the motor has come on), I have the following circuit:
My thinking is that since it's a motor starting, it's probably pretty noisy and with transients. Possibly a few milliamps of this signal is getting lost and confusing the GFCI. I tried the circuit tapped right off of the line (same 120VAC outlet, but before I had connected the voltage divider circuit to the motor) and no trouble. So it seems to be related to the motor and start up.
Any other theories besides my thought with the transients?
I have a logic gate sensing when a 1/2hp 120V AC motor turns on. To get the 5Vdc logic signal (that the motor has come on), I have the following circuit:
My thinking is that since it's a motor starting, it's probably pretty noisy and with transients. Possibly a few milliamps of this signal is getting lost and confusing the GFCI. I tried the circuit tapped right off of the line (same 120VAC outlet, but before I had connected the voltage divider circuit to the motor) and no trouble. So it seems to be related to the motor and start up.
Any other theories besides my thought with the transients?