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post #1 of 9 Old Feb 4th, 2007, 9:34 pm Thread Starter
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Question Relay Question

Now that I understand what relays do, I bought some relays to make a circuit hot only when ignition is on. Will sense the seat heater for this. Now, I need to know how to hook it up.

The relay is identified by screen printing on the front as Y41A-1C-12DSM
NO:40A/NC:30A 12VDC

Can anyone decode the posts on the back for me? What goes where? Posts are identified as:

. . . 87

86 87a 85

. . . 30

(NOTE: Dots added for spacing only)



TIA

Antony (Tripod)
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post #2 of 9 Old Feb 4th, 2007, 10:02 pm
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Smile Relay!

Quote:
Originally Posted by deputy5211
Now that I understand what relays do, I bought some relays to make a circuit hot only when ignition is on. Will sense the seat heater for this. Now, I need to know how to hook it up.

The relay is identified by screen printing on the front as Y41A-1C-12DSM
NO:40A/NC:30A 12VDC

Can anyone decode the posts on the back for me? What goes where? Posts are identified as:

. . . 87

86 87a 85

. . . 30



(NOTE: Dots added for spacing only)



TIA
Hoping I don't have a senior moment here:

85 and 86 are the relay coil. One to the source of switched power and the other to ground.

30 is feed from the battery positive. (preferably a fused line.)

87, 87a is the power out from the battery terminal (30)
Not sure of your relay, sometimes 87a does not exist. If it does it usually is a normally closed contact set (NC) and is live until the relay coil is energized.
87 is a normally open contact set that becomes live when the relay coil is energized. This is the one you will probably be using.
Sometimes 87a is parallel to 87 and will only be live when the relay coil is energized. ( I think that is done to increase the load carrying capacity of the relay.)
You will have to take a meter or test light and figure out the configuration.

HTH
Good Luck!

And reading your relay description, yours is rated at 30 amps NC (normally closed term 87a)
and 40 amps NO ( normally open term 87)

Duane

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Last edited by Dman; Feb 4th, 2007 at 10:16 pm.
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post #3 of 9 Old Feb 4th, 2007, 10:04 pm
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Tony, The 85-86 are probably the "coil contacts. This is simple to test. Take your meter, set to ohms... there should be some resistance there and none on the one that is the "switch.."

If you have nay probs, let me know.. you can call the house..

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post #4 of 9 Old Feb 4th, 2007, 10:21 pm
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Here's a link to Joe's homesite with a good drawing of how to hook up a relay.



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post #5 of 9 Old Feb 4th, 2007, 10:30 pm
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Quote:
Originally Posted by grifscoots
Here's a link to Joe's homesite with a good drawing of how to hook up a relay.

The way he shows it he has 87 and 30 wired backwards. It will work that way tho.

This should help.
Schematics shown at the bottom of the page.

Duane

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Last edited by Dman; Feb 4th, 2007 at 10:46 pm.
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post #6 of 9 Old Feb 5th, 2007, 12:12 am
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Resource...

This is still a great resource for beginning electricians...

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post #7 of 9 Old Feb 5th, 2007, 8:05 am Thread Starter
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Excellent help, thank you, all. Now I understand.

One of the referenced links references placing a diode across the coil contacts:
"Diode across the coil of a relay:
The diode provides a path for current when the current path to the relay is interrupted (i.e. switched off). This allows the coil field to collapse without the voltage spike that would otherwise be generated. The diode protects switch or relay contacts and other circuits that may be sensitive to voltage spikes."


(Source: http://www.the12volt.com/diodes/diodes.asp)
Is this something I need to be concerned with, or should I Just Do It so I can Just Ride It . . .

Antony (Tripod)
Dallas' Northern Suburbs
-----------------------------------------------

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If you want to be happy for a lifetime, ride a motorcycle.

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post #8 of 9 Old Feb 5th, 2007, 9:44 am
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The diode isn't necessary...

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post #9 of 9 Old Feb 5th, 2007, 9:46 am
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Quote:
Originally Posted by deputy5211
Excellent help, thank you, all. Now I understand.

One of the referenced links references placing a diode across the coil contacts:

"Diode across the coil of a relay:

The diode provides a path for current when the current path to the relay is interrupted (i.e. switched off). This allows the coil field to collapse without the voltage spike that would otherwise be generated. The diode protects switch or relay contacts and other circuits that may be sensitive to voltage spikes."

(Source: http://www.the12volt.com/diodes/diodes.asp)
Is this something I need to be concerned with, or should I Just Do It so I can Just Ride It . . .
Diodes are normally used across any coils that are driven by solid state devices to prevent the reverse voltage spike from destroying the output transistors. These are often called "free wheeling" diodes. If you are using switches to turn the relay on, then they are not necessary.

One has to be very careful using diodes across coils, if installed backwards they are almost a dead short!

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