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clamping diodes


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resquchas 
Copper - Posts: 93
Copper spacespace
Joined: April 15, 2010
Location: Virginia, United States
Posted: December 28, 2010 at 2:15 PM / IP Logged  
any ifo on how to set up a clamping diode using 1n4004 and a zener diode. I was reading that the zener can speed up and prevent tacking of the contacts which could reduce the life of the relay. how much life reduction has been noticed if any. is this just theory? I want the most reliable method possible. what i saw was that a simple reverse biased diode across the coil can lead to the contacts even bouncing together. Granted stopping the massive voltage spike but decreasing the life of the contacts. any thoughts?
The RIGHT way is the ONLY way.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 28, 2010 at 6:10 PM / IP Logged  
In practice a diode across the coil contacts should STOP bounce, surely the zener diode is only there fore voltage regulation, come on in Oldspark, Dualsport etc.
resquchas 
Copper - Posts: 93
Copper spacespace
Joined: April 15, 2010
Location: Virginia, United States
Posted: December 28, 2010 at 6:24 PM / IP Logged  
if you have never had any reliability issues then i am not gonna worry about it. I try and make relays easy to get to but sometimes not practical and wanted to make it perfect.
The RIGHT way is the ONLY way.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 28, 2010 at 10:43 PM / IP Logged  
AS a point of interest, German* made Bosch, US made Honeywell and Amp/Tycho and Japanese Omron and Panasonic are rated for 15 million + cycles.
*Current Bosch are apparently Chinese and not so good.
resquchas 
Copper - Posts: 93
Copper spacespace
Joined: April 15, 2010
Location: Virginia, United States
Posted: December 29, 2010 at 10:03 AM / IP Logged  
15 million should do it i would think. i might have to switch my supplier.
The RIGHT way is the ONLY way.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: December 29, 2010 at 7:07 PM / IP Logged  
The zenor shouldn't be required - and a series resistor is required for that.
The only other possibility would be to clamp the +ve voltage spike (not the reverse or -ve spike), but how often is that done? (at the relay).
Sorry for my slowness - we've been snorkling with the rays....
resquchas 
Copper - Posts: 93
Copper spacespace
Joined: April 15, 2010
Location: Virginia, United States
Posted: December 29, 2010 at 7:57 PM / IP Logged  
rescue diver myself so understand the whole snorkeling thing. so in your opinion best practices would just be the 1n4004 across the coil and call it a day?
The RIGHT way is the ONLY way.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: December 31, 2010 at 5:47 PM / IP Logged  
Yep - any 1N400x.
resquchas 
Copper - Posts: 93
Copper spacespace
Joined: April 15, 2010
Location: Virginia, United States
Posted: December 31, 2010 at 7:12 PM / IP Logged  
thanks everybody
The RIGHT way is the ONLY way.

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