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Can this be reversed and still work ?


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Dan M C 
Copper - Posts: 220
Copper spacespace
Joined: June 10, 2002
Location: Romania
Posted: May 30, 2005 at 8:07 PM / IP Logged  
Hi to all,regarding relays i have this question;can this be hooked like this and still work ?
SPDT Type:
30- to whatever needs to be turned ON
86- Ground
87- constant +12V
85- INPUT for the remote turn-ON,
so basicaly instead of 85 beeing ground it's 86,can they be reversed and still have them work ?,this is for amps use.
Thank you
Dan
KarTuneMan 
Platinum - Posts: 7,056
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: December 14, 2004
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Posted: May 30, 2005 at 8:41 PM / IP Logged  
85, and 86, are reversable....as are 30 and 87
Ween 
Platinum - Posts: 1,364
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Joined: August 01, 2004
Location: Illinois, United States
Posted: May 30, 2005 at 9:33 PM / IP Logged  

hi,

should be applicable in most cases, except for relays that have a suppression diode wired internally accross the coil.  just my two cents.

mark

ff-mike 
Copper - Posts: 199
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Joined: November 15, 2004
Location: United States
Posted: June 01, 2005 at 10:50 AM / IP Logged  
Ween is correct, and we should make it a habit to wire things as if the internal diode is there because it will save labor later if the relay is replaced with one that has the internal diode, or if you ever have to rewire crappy OEM wiring.
30 & 87 are reversible, but we should follow the conventions that 30 is source and 87 load for simple circuits because of less labor when adding on to the system using either a 2nd 87 output or an 87a
Dan M C 
Copper - Posts: 220
Copper spacespace
Joined: June 10, 2002
Location: Romania
Posted: June 01, 2005 at 7:52 PM / IP Logged  
Thank you guys,i apreciate it.
Dan
Montrealler 
Copper - Posts: 155
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Joined: October 05, 2002
Location: Canada
Posted: June 13, 2005 at 3:59 PM / IP Logged  
ff-mike wrote:
Ween is correct, and we should make it a habit to wire things as if the internal diode is there because it will save labor later if the relay is replaced with one that has the internal diode, or if you ever have to rewire crappy OEM wiring.
30 & 87 are reversible, but we should follow the conventions that 30 is source and 87 load for simple circuits because of less labor when adding on to the system using either a 2nd 87 output or an 87a
Up to me it is always better to put the source on 87 and the feed on 30 that way if your source is 12 volt you will not cause a short on pin 87a when the relay is not actuated.
ff-mike 
Copper - Posts: 199
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: June 13, 2005 at 4:15 PM / IP Logged  
you lost me there
Theshadow27 
Member - Posts: 38
Member spacespace
Joined: April 21, 2005
Location: Virginia, United States
Posted: June 15, 2005 at 2:27 PM / IP Logged  
except that the point of a relay is to act as a switch - you cant switch backwords... so you should stick with 30 as source. this goes all the way back to the original key switches where 30 was common and 87 was switched to the starter motor. autos are common ground systems so we have to keep 30 as +12.
ff-mike 
Copper - Posts: 199
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: June 23, 2005 at 10:10 AM / IP Logged  
Mechanical switches are reversible, electronic switches may or may not be reversible
If #30 is common, and common is ground, then all you can do with a switch is ground a circuit.
Maybe thats why DIN defined 87 as switch input, 87a as the NC ouput, and 87b as the NO output
maglin 
Copper - Posts: 206
Copper spacespace
Joined: June 30, 2004
Location: United States
Posted: July 07, 2005 at 10:17 PM / IP Logged  
NC - Normally Closed
NO - Normally Open
those abbriviations killed me for the longest time. lol. just to make sure the readers hear know what they mean.

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