Modular relays
Time delay relays are a specific category of control relays equipped with an integrated timing function.
What is the distinction between time delay relays and electromechanical relays?
The distinguishing element lies in the timing point at which the output contacts activate or deactivate. In a conventional control relay, the contacts operate in response to the application or removal of voltage to the coil. In contrast, time delay relays ensure that the contacts activate either before or after a predetermined time lapse. When choosing a time delay relay, it is crucial to consider the specific timing requirement of the application in question.
What are the different types of timing functions?
Time delay relays offer several commonly used timing functions, including:
- On-Delay: The timing starts as soon as voltage is applied.
- Off-Delay: The relay is ready to be activated as soon as voltage is applied.
- One-Shot: One-shot mode.
- Interval: Interval and flashing mode (on first/off first).
- Repeat Cycle: The relay contacts change state when voltage is applied, then the timing begins.
How to program a time delay relay in an application?
When designing an application, it is important to understand the distinctions between the different categories of time delay relays. This involves considering what should initiate the timing, whether the timing should start simultaneously with the application of voltage, and the timing of its activation upon the removal of voltage.
Time delay relays can be initiated by:
- Application of voltage
- Closure or opening of a trigger signal
The trigger signals can take the form of:
- Control contacts (dry contact), such as limit switches, float switches, or push buttons
- Voltage (electrical trigger)
In what application areas are time delay relays used?
Time delay relays are generally used in industrial applications as well as original equipment. They are crucial in many industrial processes, including small panel or sub-panel applications, lighting circuits, motor start control, management of sensitive equipment, security systems, and timing sequences for conveyors.
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