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Delaying current to a relay


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radkonn 
Copper - Posts: 73
Copper spacespace
Joined: January 21, 2005
Posted: March 02, 2005 at 10:49 PM / IP Logged  
If it was seventy five dollars than it isn't the one I'm talking about. I saw one on ebay yesterday, but it was for 18 to 30 volts. There was a guy on ebay selling 10 delay on break time delays for like 15 dollars a while back. However, you need a delay on make time delay. I'll try and find one searching the internet. You can try doing it other way using capacitors and resistors; I was just trying to give you an easier solution. The time delay I'm talking about has regular 1/4 in stake on terminals.
704acc 
Copper - Posts: 55
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: March 02, 2005 at 10:56 PM / IP Logged  
I really appreciate everyone's efforts.  If you do find anything please let me know.  I found a company called Kussmaul Electronics out of New York who has a time delay relay model # 091-100-012-B which might work.  What do you think?
Ray Kane
radkonn 
Copper - Posts: 73
Copper spacespace
Joined: January 21, 2005
Posted: March 02, 2005 at 11:22 PM / IP Logged  
I did a quick search and found this one that has a .01 to 10 second delay. It is a little more than I am used to paying, but it should work if your willing to pay the price. I'd just try looking through some more websites. I hit this one on the second site I looked through. I just typed in automotive time delay into google. You can try some variations like 12vdc delay on make time delay, 12volt time delay, etc....
Hope this helps.
Delay On Make Time Delay
slush 
Member - Posts: 38
Member spacespace
Joined: January 23, 2005
Location: United States
Posted: March 03, 2005 at 2:35 AM / IP Logged  

704acc wrote:

Do you know where I might get one of these relays with a 1 to 3 second delay?I think I am catching on here - please correct me where appropriate:

Capacitors have a polarity and resistors do not?

I connect the switched 12volt+ siren lead to either side of a {what value?} resistor{s}

Then connect the remaining resistor lead to the positive side of a {47uF?} capacitor

Then connect the negative side of the capacitor to the relay's contact {85 or 86 - does it matter?} and the other relay contact to ground.

How am I doing?

Yes, that's right!  The type of resistor depends on the amount of delay you want.  The higher the resistance, the more delay you'll get.  Like my previous calculation, about 2s delay with a 47uF capacitor would require a ~42K resistor.  So you could do any combination (just simple addition of resistor values):

10K + 10K + 10K + 10K = 40K resistance (prob like 1.8s delay).

33K + 10K + 1K = 44K resistance (2s delay)

etc.

I don't know all of the resistor values that are out there... just those.  So if there is one closer to 44K or 50K you could get that and have a 2s-2.5s delay so you won't have to have a "resistor chain".  You would just connect each resistor to each other in series like:

TRIGGER----[ R ]----[ R ]---[ R ]--------|C(------RELAY

R = resistor, C= Capacitor. 

Oh and remember, never reverse the polarity on a capacitor.  It's a nice way to see an 80 cent fire cracker (it'll blow up).  Just make sure the NEGATIVE side is going to the relay and you'll be good to go (the negative terminal is almost always marked on the body).

You could go the route that radkonn suggested, but you'd be spending around $20 more than just getting these few parts from radioshack. 

Just buy a very very small project breadboard, the 47uF capacitor, the resistor(s), a couple of wires, and you'll be set.

-Derek

riceman 
Copper - Posts: 109
Copper spacespace
Joined: October 14, 2004
Posted: March 03, 2005 at 3:35 PM / IP Logged  
704acc wrote:

This is my first post so please bear with me.  I am using the 12 volt positive siren lead from my Viper alarm to trip a relay in addition to powering the siren.  I do not want to energize the relay when the alarm is armed/disarmed and the siren chirps, but I want the relay energized when the alarm is tripped and the siren is sounding.  Is there a way to delay the current to the relay {but not the siren} for a second or two?  I have a JPEG of the diagram if anyone can assist me with posting it.

Regards,

Just a quick thought, now that you've hooked up your siren check if your alarm has a horn output wire sometimes the horn output wire on some alarms only trigger when fully triggered. On most alarms its a BROWN / white. hopefully that helps.

704acc 
Copper - Posts: 55
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: March 03, 2005 at 7:19 PM / IP Logged  
Thanks to everyone for their suggestions.  I just went thru the installation manual - no such luck.  There is not an output for when the alarm has been triggered.  I am gonna keep the search up for some sort of delay.  If anyone runs across something, let me know
Ray Kane
zzimerclan 
Member - Posts: 15
Member spacespace
Joined: January 03, 2005
704acc 
Copper - Posts: 55
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: March 23, 2005 at 1:00 AM / IP Logged  

Well I purchased the DEI 528T pulse timer and started playing with it last night .  PLEASE SEE MY NEW POST 

I need all of the help I can get!

Ray Kane
704acc 
Copper - Posts: 55
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: March 24, 2005 at 7:04 AM / IP Logged  

Any other ideas?

dare_ds69 wrote:
you can't

QUOTE=704acc]

I purchased a DEI 528T pulse timer for my alarm.  I need it to wait a few seconds before providing power {via its built in relay or I could add a relay} to a second siren.  This will prevent the second siren from chirping on arm/disarm but have it sound when the alarm is tripped.  I am bench testing the unit before i install it.  The unit does the opposite of what I want it to do.  When the unit is triggered by a pulse from the "alram siren" the timer latches the relay for the set time then unlatches.  The wiring is as follows:  Red = 12 constant pos; Black = ground;  Black stripe = trigger wire;  Yellow = common 30;  Brown = normally open 87;  Orange = normally closed 87a

how do I get the unit to delay before latching?

[/QUOTE]

Ray Kane
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