Timer board

[333rocky333]

Bought from RS, basically to add to an existing gate maglock to allow more time for access.
However think i am ok with the wiring, but a bit lost regarding the Jumper position and what they are saying the difference between 1, and 2,
Any help appreciated

20210509_103227

• 333rocky333
• 9 May 2021

 

[sparkymarka]

Sounds like jumper on requires a reset after timer ..

 

[Gasguru]

I think it's saying that if the jumper is removed then as soon as you hit the button the relay is energised and the timer starts counting down,
and if the jumper is present the timer only starts counting down once the button is released.

 

[333rocky333]

My first thoughts too, i assume option 1 prevents someone jamming the button in and hence leaving the gate open
30 seconds is ample time so will likely try that option

 

[Gasguru]

It doesn't mention the type of load the relay can handle so you might want to connect a hefty diode back to front across the contacts to prolong the life.

 

[333rocky333]

It doesn't mention the type of load the relay can handle so you might want to connect a hefty diode back to front across the contacts to prolong the life.

I seem to recall doing that once years ago on an old solenoid lock, what does it do stop the the contacts arcing or something, This is for a small 12 volt Dc maglock, do you think it would need a diode, If so i would have to order one and return at a later date.
Heres the timer on the Rs site

https://uk.rs-online.com/web/p/acce...MkWd-ZfkA0THhQtCOmxoCDlMQAvD_BwE&gclsrc=aw.ds

 

[Gasguru]

When the relay contacts open the current that flows through the solenoid coil needs to decay and if there isn't a path (say via a diode) arcing across the contacts is the result.
With a small solenoid I wouldn't worry...those modules are cheap enough and it looks like a standard easily obtainable relay.

 

[bernardgreen]

RS seem a bit confused, looks like two different designs with same order code

https://uk.rs-online.com/web/p/access-control-accessories/8700720/

https://docs.rs-online.com/2123/0900766b81584bad.pdf

 

[sparkymarka]

It doesn't mention the type of load the relay can handle so you might want to connect a hefty diode back to front across the contacts to prolong the life.

the load that is on the sheet ? 5 amp 28v dc or 3amp 240v
Anyway most decent make mag locks have built in suppression

 

[333rocky333]

I do have some of these diodes, if any good

IN4004 304C

20210509_133227

• 333rocky333
• 9 May 2021

 

[sparkymarka]

Normally it’s a 4001 …should be ok according to google …

 

[JohnW2]

Normally it’s a 4001 …should be ok according to google …

Indeed, although Rocky does not need the 400V PIV of a 4004, it would do no harm.

Kind Regards, John

 

[333rocky333]

Indeed, although Rocky does not need the 400V PIV of a 4004, it would do no harm.

Kind Regards, John

Thanks John, Gasguru suggested putting the Diode across the contacts, but Google seems to show them across the coil.
Sparkymarka suggests the mag lock may have built in surpression which looking at ones on Google does seem likely.

So bit lost to be honest, where I put the Diode.

I cannot access the coil and do not really want to start soldering it so
Could i go across + and pb
or
Across the contacts
Com and N/C

 

[sparkymarka]

It goes across the lock ….

 

[JohnW2]

Thanks John, Gasguru suggested putting the Diode across the contacts, but Google seems to show them across the coil.

Across the coil would be the norm. It's the 'back emf' across the coil which can damage contacts etc. Putting a diode across the contacts would send that voltage/current 'somewhere else', where I imagine it might possibly damage electronics.

Kind Regards, John