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Introduction to Timers

Timers are available in many types and styles.

We will show in detail how to work with the most common types of timers.

The timer used is a Dayton Multi-function Multi-Range solid state timer that can be setup as a one shot, on delay, off delay, repeat and Interval timer. This timer is available from Granger for under $80 - Part Number 6A855 - Timing Range is 50MS to 999 Minutes.



On Delay Timer 3 step operation.

1) Power. Upon application of voltage to input terminals 2 and 10, Timing Starts.

2) Timing. Timing to the Preset time range

3) Switching. Contacts transfer the DPDT/internal relay becomes energized.

Power = Timing = Switching

If the input power is interrupted before the timing period is complete the timing circuit will start over.

e. g., A 10 second on delay timer will need uninterrupted power for the full 10 seconds in order for the contacts to change state.

When power is removed the contacts return to their original state.

Watch the illustrated animation for a demonstration of how the circuit works.





Off Delay Timer

Power is applied to terminals 2 and 10

The Switching Contacts Transfer as soon as the start contacts close terminals 5 and 6

Timing starts as soon as the start contacts open.

After timing, the contacts return to their original state.

e. g., a momentary button at terminals 5 and 6 (Start input) with a timer set for 10 seconds

The button is pushed in for 3 seconds and the contacts are switched for 13 seconds because timing starts when the button is released.

Watch the illustrated animation for a demonstration of how the circuit works.