E7022PI004

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Time delay relays are devices which control the sequence of circuits. The most common example is the shutoff switch on an air conditioner which delays the start up of the compressor until the fan is operating. E7022PI004 is one of the widely used time delay relays, and it has its own application fields and working principles.

Application Fields

The E7022PI004 can be used in a variety of fields. In the the home appliances industry, it can be used for electronic ovens, oven controls, coffee machines, and more. This particular product is ideal for controlling appliances as it is programmable and may be set to delay start, reset and shutdown processes. In terms of industrial use, this device can be used to control the time needed for fire protection systems, as well as for presses, cranes and other automated machinery that require a delay in control operations.

Working Principle

The E7022PI004 is a 20-pin integrated circuit (IC) that contains electronics circuitry for timing and control. It utilizes a delay-ON timing circuit that begins a delayed period as soon as power is applied. When the preset delay period elapses, it forces the output relay to energize. The output relay is designed to remain energized until the power supply to the IC is removed. The power to the IC should be applied between the voltage terminals of VCC+ and VCC-. The delay period is programmed by the user, based on the required timing period. The device operates with an AC or DC power supply and uses a timing element, which is a network of resistors that is connected to a timer input pin.

When power is initially applied, the control logic (timer) detects a start-up pulse on the timer input pin. This initiates a timer period, determined by the set of resistors connected to the timer input pin. The timer begins counting down from its current value, and when it reaches zero, it energizes the output relay. When the timer is depressed, the timer period is reset and the device starts counting down again from its current set value. The device continues to energize the relay when the timer period has expired and it will remain energized until the power is removed.

Conclusion

The E7022PI004 is a time delay relay which is widely used in a variety of application fields such as home appliances and industrial machinery that require a delay in control operations. It functions by detecting an initial start-up pulse when power is applied and initiating a timer period as a result. The timer period is determined by the set of resistors connected to the timer input pin. When the timer period elapses, the output relay is energized. The output relay will remain energized until the power is removed. This device is ideal for controlling appliances, and it is a cost-effective solution for controlling the time needed for fire protection systems.

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