There is an electromagnet at my job that has a 50% duty cycle. That is it may be on for up to 5 minutes and then off for 5 before using it again. I want to design a circuit that acts as a time integrator. As long as a relay is pulled in, the timer is counting up. When the relay is out, the timer counts down to zero and stays there. If the operator isn't paying attention, and he goes over 5 minutes, an alarm sounds to alert him that he is operating the electromagnet outside its design parameters. How can this be accomplished? Any suggestions would be appreciated.
- posted
18 years ago