can somebody please give me a working diagram for alternate on-off operation?!
as a specific example:
two pumps connected in series. when a high level switch is triggered, pump 1 will operate while pump 2 remains off. when a low level switch is triggered, pump 1 will turn off (both pumps now are off). when the high level switch is triggered again, it is now pump 2 that will operate while pump 1 is off. when the low level switch is triggered, pump 2 will turn off (both pumps now are off)... and cycle repeats. the two pumps should not operate simultaneously.
i easily created a circuit with plc diagram using one-shot relay. but when an interviewer asked me to draw a diagram for hard circuit (not plc), too bad i cannot think about it easily.
thanks!
as a specific example:
two pumps connected in series. when a high level switch is triggered, pump 1 will operate while pump 2 remains off. when a low level switch is triggered, pump 1 will turn off (both pumps now are off). when the high level switch is triggered again, it is now pump 2 that will operate while pump 1 is off. when the low level switch is triggered, pump 2 will turn off (both pumps now are off)... and cycle repeats. the two pumps should not operate simultaneously.
i easily created a circuit with plc diagram using one-shot relay. but when an interviewer asked me to draw a diagram for hard circuit (not plc), too bad i cannot think about it easily.
thanks!