Loop control problem
Thread Content
I would like to ask: I want to use two time relays to control the operation of two motors. For example, motor A operates for 5 seconds before stopping, motor B operates for 10 seconds before stopping, and then motor A operates again for 5 seconds before stopping... How can this be achieved? Is it necessary to use additional relays?
It depends on the motor power. Since the contact capacity of time relays is relatively low and the motor requires high power, a large contactor is necessary; as a result, the contacts of the time relay may not be able to handle the load. In such cases, an intermediate relay must be used as an intermediary. If the contactor is small, it’s not necessary.
Actually, it’s much easier to use a logo; it offers good value for money and is easy to maintain.
How exactly is this to be achieved? The power level of the motor doesn’t matter; what’s important is how to implement cyclic control
They are controlled by each other using two time relays. The overall principle is as follows: When time relay A is powered on, it delays the activation of time relay B; once B is powered on, it delays the disconnection of power to relay A’s coil. When A loses power, B also loses power, and once B loses power, A gains power again. This creates a cyclic control mechanism with mutual triggering. The implementation method involves connecting B’s normally closed contact in series with A’s coil, and A’s normally open contact in series with B’s coil. By setting a time interval and applying power, cyclic control can be achieved. Time relays of the electric delay type should be used
Nothing else is needed, but a interlock circuit for the set of A and B pumps should be added. It is recommended to use an intermediate relay; the contacts on a time relay are limited in number. The signal for starting pump A should be taken from the normally closed contact of pump B’s intermediate relay, while the signal for pump B should be taken from pump A’s intermediate relay.
It can definitely be done; I posted such drawings on that forum last time.
http://bbs.hcbbs.com/thread-4748-1-3.html Take a look; these are the pictures I posted last time. The operating time for both time relays is indicated, and it can be adjusted. I used them to control the ventilator in the basement water station. With this control setup, the ventilator operates three times a day for two hours each time, with 8 hours of downtime in between. They are Delta time relays, and their operating time can be adjusted within 12 hours.