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Relay Question - Negative Output to a Positive Output Pin 85 Showing Power?
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cloves
New User
Jul 11, 2012, 12:48 PM
Post #1 of 5
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Relay Question - Negative Output to a Positive Output Pin 85 Showing Power?
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Hi everyone,
I have a ground switching circuit controller relay that I needed to change to a positive. So I went with another relay to convert the negative output to a positive output.
So I wired in the relay and its working. BUT I noticed that on Terminal 85 which is my negative trigger coming from the the controller relay, that it shows 12volts all the time until the negative trigger is activated. So my relay is feeding power back to the controller.
The relay has 12v coming into it via 30 and 86, now is it also normal for that 12v to travel out of pin 85 as well? I know once the controller relay give it a negative trigger, power exits out of pin 87, but I don't know if its suppose to show power exiting 85 all the time. So if you look at my diagram below, power is coming from the relay back up the (-) trigger number 85.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 11, 2012, 1:28 PM
Post #2 of 5
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Re: Relay Question - Negative Output to a Positive Output Pin 85 Showing Power?
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In the diagram that is called a pull down circuit. That means the controller's transistor pulls the voltage from the relay's coil to ground to energize the coil which closes the contacts. If you have it connected up and you back probe the terminal 85 with a volt meter connected to ground, you will see 12 volts sitting there waiting for the transistor to ground the circuit. Once the transistor grounds the circuit the voltage will go to 0 volts.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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cloves
New User
Jul 12, 2012, 4:00 PM
Post #3 of 5
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Re: Relay Question - Negative Output to a Positive Output Pin 85 Showing Power?
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Discretesignals, thanks for the insight!
Do you think that the power coming out of the other side of the coil (pin 85) and going back up to my controller relay, will damage my controller? I am trying to make sure the derale controller doesn't get damaged.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 12, 2012, 4:03 PM
Post #4 of 5
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Re: Relay Question - Negative Output to a Positive Output Pin 85 Showing Power?
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That is normal. The relay has continuity through the coil so you will always read power on the other side until it's grounded. That's what makes it work.
If you remove the relay, you won't see any power on that socket.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jul 12, 2012, 4:04 PM)
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Discretesignals
Ultimate Carjunky
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Jul 12, 2012, 4:10 PM
Post #5 of 5
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Re: Relay Question - Negative Output to a Positive Output Pin 85 Showing Power?
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No, it won't damage the transistor in your controller as long as the transistor is designed to handle the current the relay uses.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 12, 2012, 4:11 PM)
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