LocksOnline product focus – Timer Relays.
In reality, there is not a lot to say about the timer relay however, be mindful that it is quite an important part of an access control solution.
If you are ever thinking of fitting and access control solution where say perhaps you have a magnetic lock on your door. It is common that when you press the button to release the magnet that the magnet will stay release for 4 or 5 seconds. This may be done in two different ways. The first way is probably part of the main access control function from a keypad or proximity reader. It is not uncommon these days that when fitting a keypad or a proximity reader on the outside it has a delay function that will interact with a push to release button on the inside.
Sometimes, there is no need to have key pads or the like to control access or egress. And in some applications you may simply need a push to release button on either side of the door. When fitting a system like this one of the commonality problems is that to release the magnet you need to be pushing the button on the push to release switch at the same time as pushing the door open. This can be quite cumbersome if you have shopping or holding other things in your hand at the same time. this is when a timer relay comes into its own.
There are quite a few variations of time relays but one of the most popular is the D– 6G timer relay that is on our site.
We have decided to take an image of this timer relay and overlay on it what the terminations are and how it works.
Sitting in the centre of the printed circuit board there is a variable potentiometer that allows you to alter the time delay between 2 and 60 seconds. In the cluster of the five terminals on the right the first three relate to a dry relay contacts which change state when the other two terminals by the side get shorted together.
Two terminals at the top of the timer relay is where you would permanently connected a 12 V DC supply to. The purpose of the permanent supply to the timer relay is to ensure that the Timer Relay is energised so the timer facility function will be maintained.
Of course, these relays are not only limited to access control functions and can be used for an example switching lights on counting down or any other function where you need a delay between the cause and the effect.
For more information on Timer Relays
Head of the tech team.