Working Principle of Timer
- The on-delay relay timer provides a change to the state of the contacts that are controlled by the energizing of the timer.
- The on-delay relay timer can be set or programmed to a predetermined time and this is called the preset time.
- Preset time can be as low as milliseconds to hours and even days but usually, in the industrial control system, it is set to seconds and minutes.
- Once the coil of the timer is energized the timer starts to count from zero to the pre-set time, this count is known as the accumulated time.
- When the preset time and accumulated time are equal the contacts of the timer change their state; contacts that are normally open when the coil was not energized go closed and contacts that are normally closed will change to open.
- The contacts of the timer will stay in their changed state for the same amount of time the coil is energized.
- When the power is removed from the coil of the timer the accumulated time returns to zero and contacts return to their original state.
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