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relay failure


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megatfauzi76 
Copper - Posts: 93
Copper spacespace
Joined: December 14, 2006
Location: Malaysia
Posted: October 24, 2010 at 9:20 PM / IP Logged  
Hai,
Can I know is there any possibilty relay can fail in operating? 30 and 87 connected all the time? What reason can make the relay failure?
Thank You
KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: October 24, 2010 at 10:44 PM / IP Logged  
Yes, as relays are electromechanical all relays will eventually fail, although they typically last a very, very long time.
If 30 and 87 are always connected it could be caused by arcing caused by too much current being pulled through the contacts of the relay. This "welds" 30 to 87.
When the contacts stick like that typically striking the relay will "fix" it.
Kevin Pierson
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: October 25, 2010 at 12:12 AM / IP Logged  
Or broken coil/solenoid or its connection (85 & 86).
megatfauzi76 
Copper - Posts: 93
Copper spacespace
Joined: December 14, 2006
Location: Malaysia
Posted: October 25, 2010 at 1:17 AM / IP Logged  
My battery drain out this morning...because of that relay..it for my autostart by pass..ist possible it drain out my battery?
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: October 25, 2010 at 3:37 AM / IP Logged  
If it is fused at KP suggested, then yes - the load is still connected.
(That's if there is a load - others can advise on autostarts.)
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: October 25, 2010 at 5:24 AM / IP Logged  
The coil if kept live will typically draw about 1.25 amps, will flatten the average battery in 18-24 hours.
Most Bosch, Tycho, Honeywell, auto relays are rated 15million + ops.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: October 25, 2010 at 5:27 AM / IP Logged  
I should have said it also depends on where it,s mounted, whether or not in the car or engine bay (corrosion) and the angle, i.e. terminals down = gravity and drainage are on your side, also any under hood relay I install, I securely mount it and spray all over with water retarder.
dualsport 
Silver - Posts: 983
Silver spacespace
Joined: September 27, 2005
Location: United States
Posted: October 25, 2010 at 8:57 AM / IP Logged  
If your relay is switching inductive load currents near its ratings, the common practice of the suppression diode across the coil for protecting the drive circuit actually makes things harder for the relay, because it delays the opening process of the contacts, when it needs to break quickly. If this becomes a factor, using an additional zener along with the diode protects the drive circuit without causing this delayed turnoff.
Otherwise the increase in the time that current is arcing across the contacts could cause the relay contacts to weld and stick together. If you can't modify the drive circuit and it wasn't just a one time occurrence you may want to try a quality relay with a higher current rating.

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