Explain power on time delay relay timer driver#
Explain power on time delay relay timer series#

Notes 2 The earliest time-delay relays used pneumatic dash-pot motion dampers to provide the. le 03132 Answer 2 A time-delay relay either waits before actuating after power-up, or waits before de-actuating after power-down. By changing the potentiometer value or C1-C2 value, we can achieve different time delay levels. Explain what a time-delay relayis, and how it functionally diers from a regular electromechanical relay. Hence we can achieve a few seconds to a few minutes time delay. With multi-function relays we often find an LED built into the device, this will flash at different intervals to indicate what function it is currently performing. To complete the above process it takes some time delay depending on potentiometer value, C1-C2 charge time, and Zener diode breakdown voltage. It means that, even if you cut the input power to the timer, the timer still provides the contacts to the exiting circuit. The time delay relays and switches will operate automatically once setup and provided with a trigger or a signal to cause the action. Then the base-emitter voltage limit of the Q1 transistor is reached by the C2, Q1 gets turned ON and the relay coil gets a complete DC supply. When it’s completed and above the cutoff limit of the Zener diode, voltage is passed to the C2 capacitor and it gets charged. A small level of voltage is passed to C1, and it gets charged. Now we need to power the circuit, here supply value to this circuit depends on the value of the potentiometer. Here 12V relay is connected with the collector terminal of the SL100 transistor, the bicolor LED terminal green is connected with the emitter of Q1 and terminal red is connected across the collector. The second stage of this circuit is a relay with an indicator LED. The output of the variable resistor (potentiometer) is connected to the C1 capacitor and reverse-biased Zener diode, then the C2 capacitor finally to the base of transistor SL100. Resistor R1, potentiometer, and R2 are connected in series, and across to the DC input supply.

Explain power on time delay relay timer series#

Here the first stage of this circuit is time delay elements, such as voltage divider resistor series and two electrolytic capacitors. However, if S1 is pressed for longer than T, and then released, U1 wont time out at all itll just follow S1. This circuit decides the time delay, to give power supply to the electromechanical relay coil (by the way to the load connected to the relay). The circuit youve shown is that of a 555 timer wired as a monostable multivibrator and if S1 is pressed and released, pin 3 will go high as soon as S1 is made and will turn the relay ON for: T 1.1 × R 1 × C 1 seconds.

Explain power on time delay relay timer driver#

This time delay relay circuit contains an electromechanical relay and driver circuit.