7022JC Industrial Controls

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Time Delay Relays (TDRs) are commonly used in control systems where a delay is needed between the operation of two different functions. The 7022JC application field and working principle can be best illustrated by examining a real life example. Consider a situation where a machine has to be powered up before a certain operation has to be executed for a certain period of time. In this case, a TDR will be used to delay the on-state of the machine and provide a delay before the operation is executed.

The 7022JC is a dual time delay relay (TDR) with two independent channels. It is commonly used for controlling the on-state of circuits and equipment with selectable timing functions. Each of the two channels is operated independently and is provided with individual control inputs. Additionally it offers a wide range of settings for fine-tuning the delays for each channel.

The working principle behind the 7022JC can be understood by examining its different components. At the center of the TDR is a relay (known as a latching relay) that serves to maintain the on-state of a circuit for a predetermined amount of time. It is operated by an electronic circuit that controls the time period of the relay. This circuit is powered by an external direct current (DC) supply and uses components to create a delay-on effect.

The DC supply is connected to the relay coil. When an external trigger signal is given (commonly in the form of a voltage switch or contact closure), the coil is magnetized by the external supply and the armature of the relay is pulled in. This creates a normally open (NO) contact. This contact must be provided with a delay-on to ensure the external equipment is provided with enough time to respond. The delay-on is created by the combination of a capacitor, a resistor and a transistor that provide a timed current flow which in turn triggers the relay after a certain amount of time.

The capacitor stores the energy needed for activating the relay and is charged via the resistor and the external DC supply. When the external trigger signal is given, the resistor serves to limit the current flowing from the power supply to the capacitor. The transistor, which acts as a switch, is in series with the resistor and capacitor. When the Voltage at the capacitor reaches a certain level, the transistor is activated, allowing the current to flow from the capacitor to the relay and activating it.

The time delay of the 7022JC is adjustable up to a maximum delay time of 10 seconds. It is possible to adjust the time delay by replacing a resistor, capacitor or both components simultaneously. This allows for customization and optimization of the timing of the TDR and makes the 7022JC a versatile choice for a variety of applications.

In conclusion, the 7022JC application field and working principle serve as an effective control system in any situation where a delay is needed. This device is both versatile and reliable, thanks to its adjustable timing options and robust design. The 7022JC is thus a great choice for use in any automation environment where a delay between two separate functions needs to be created.

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