Hello everyone! I am a new member. I hope someone is willing to help me with the following, seemingly simple, question:
I need to trip a relay (coil can be any voltage you like, AC or DC) whenever there is output from a triac. The triac's output is used to drive a 120VAC exhaust fan motor. I have access ONLY to the AC motor's leads (i.e., the triac's variable AC output).
I cannot use a 120VAC coil relay because on slow motor speeds, the triac's output is not sufficient to trip the relay. Consequently, I need a device or circuit with a wide voltage range in order to handle the very_low-to-120VAC variable output from the triac.
Alternatively, one can try to detect current flow to the motor. Whatever the method, I need to trip a relay whenever there is any output from the triac, i.e., whenever the motor is running at any speed. Once again, I have access only to the motor's two leads. How can I achieve this?
Thank you.