Time relay several contacts closed and disconnected
In addition, the general time relay sub-suction delay (coil power, relay immediately pull, delay contact delay pull or disconnect) and off delay (coil power when there is delay action), can press Title requirements Action: in the coil power, contact closure and disconnect the relay should be no, not to mention also require power off after the electromagnet is more difficult to appear.
The subject of the action requirements can be achieved with electronic circuits, power-on signal to trigger a time alone only 1 second relay, to reach the pull, the delay after one second off, the same signal triggered the relay, the same pull after a second disconnect.
The general time relay works when the working coil is energized, and some of the contacts are immediately closed (or disconnected). Some of the contacts are closed (or disconnected) according to the setting time, and are kept closed (or broken) during operation Open state until the coil is de-energized (the relay does not work).
Special with self-locking (memory function) of the relay can be powered off after the power to continue to run, that is, keep the relay after the contact state, until the release of the coil after the power to change the contact state.
The delay time relay contacts, after the relay is energized, reaches the set delay time contact action. The relay is restored after the relay is de-energized.
?????? Power-off delay time relay contact, the relay power after the contact action, the relay after power failure, arrived at the set time delay contact recovery.
?????? How do I remember my graphic symbols?
?????? Look at the power-on delay time relay contacts:
?????? Power delay time relay contact to see the arc, the arc to move in the direction of the circle, driving contact delay action
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? Look at the power delay time relay contacts:
?????? Power-off delay time relay contact is to see the arc, power contact after the action. After the power, the arc moves to the center of the circle, driving the contact delay reset.
Turn left to turn right
Of course, some time relay also with instantaneous action contacts, with the same relay contacts, power action, power recovery.
