Wiring of a 12V 4PDT Relay

[Sam]

I am trying to follow the following schematic:
http://www.scied.science.doe.gov/nmsb/pdfs/Buzzerset.pdf


Radioshack no longer caries the listed 12V 4PDT relay. I was able to
get a hold of a different 12V 4PDT relay, however I don't know if I can

use it. I know nothing about the wiring of relays. The relay that I
found has 14 pins instead of the 12 listed in the schematic. The pins
are in 3 rows of 4 with the 13th and 14th pins on the 4th row and it
looks like they connect directly to the coil. (I can email you a jpg
of the schematic of the relay if this helps).


Any help or direction would be appreciated.


Thanks,
Sam

 

[Ken Taylor]

I am trying to follow the following schematic:
http://www.scied.science.doe.gov/nmsb/pdfs/Buzzerset.pdf


Radioshack no longer caries the listed 12V 4PDT relay. I was able to
get a hold of a different 12V 4PDT relay, however I don't know if I can

use it. I know nothing about the wiring of relays. The relay that I
found has 14 pins instead of the 12 listed in the schematic. The pins
are in 3 rows of 4 with the 13th and 14th pins on the 4th row and it
looks like they connect directly to the coil. (I can email you a jpg
of the schematic of the relay if this helps).


Any help or direction would be appreciated.


Thanks,
Sam

Consider the pins to be in four rows of three - these are your four poles,
and the sets of three will be a common (Com) pin, one which is
normally-closed (NC) and one normally-open (NO).

The pins 13 and 14 on your new relay are the coil and correspond to 4 and 12
on the original one.
The other pins on the original are:

NC NO Com
1 2 3
5 6 7
9 10 11

When the relay is energized, the common contact switches over and connects
to the normally-open. So you may be able to tell which are the common, NO
and NC by looking (if it's a clear case) or by testing (multimeter and
battery). Check resistance or continuity between pins to confirm which pin
is which before and after energizing the coil. If the relay is marked with a
polarity for the coil then connect up the battery in that direction
otherwise either way is fine.

If you still have doubts post the pinout and we'll give you a direct
pin-for-pin chart.

Cheers.

Ken

 

[[email protected]]

Thanks for the quick response. I am still a little confused.

The relay I have looks like this

1 2 3 4

5 6 7 8

9 10 11 12

13 14

The case is clear and I can see that 1-9, 2-10, 3-11, 4-12 are normally
closed. When power is applied across the coil (13&14), 1-5, 2-6, 3-7,
4-8 become closed.

A pin-for-pin chart would be great because I can't figure out how to
match up what was written above to my relay.

Thanks for your patience.

Sam

 

[[email protected]]

Thanks for the quick response. I am still a little confused.

The relay I have looks like this

1 2 3 4

5 6 7 8

9 10 11 12

13 14

The case is clear and I can see that 1-9, 2-10, 3-11, 4-12 are normally
closed. When power is applied across the coil (13&14), 1-5, 2-6, 3-7,
4-8 become closed.

A pin-for-pin chart would be great because I can't figure out how to
match up what was written above to my relay.

Thanks for your patience.

Sam

 

[Ken Taylor]

Thanks for the quick response. I am still a little confused.

The relay I have looks like this

1 2 3 4

5 6 7 8

9 10 11 12

13 14

The case is clear and I can see that 1-9, 2-10, 3-11, 4-12 are normally
closed. When power is applied across the coil (13&14), 1-5, 2-6, 3-7,
4-8 become closed.

A pin-for-pin chart would be great because I can't figure out how to
match up what was written above to my relay.

Thanks for your patience.

Sam

Hi Sam. Good sleuthing.

Old relay New relay
1 9
2 5
3 1
5 10
6 6
7 2
9 11
10 7
11 3
4 13
12 14

Someone better than me might figure it out but I don't see how that first
relay can be 4PDT, but I admit to being half asleep still. Anyway, there's a
suitable pin-for-pin table for you.

Cheers.

Ken

 

[Ignoramus19860]

Based on your instruction book...

Try writing a "truth table" that goes like this:

WHEN POWER IS NOT APPLIED TO COIL

Blue wire is not connected to anything
Red wire is connected to green wire
etc

WHEN POWER IS APPLIED TO COIL

Blue Wire is connected to yellow wire
Red wire is connected to black wire

etc

Then try looking at your relay and seeing how it should be wired to
match the table.

I have 30 of these 4pdt relays, they are very versatile and useful in
all areas of life. I made some toy railroad control out of one,
opening and closing a gate when train approaches.

i

Thanks for the quick response. I am still a little confused.

The relay I have looks like this

1 2 3 4

5 6 7 8

9 10 11 12

13 14

The case is clear and I can see that 1-9, 2-10, 3-11, 4-12 are normally
closed. When power is applied across the coil (13&14), 1-5, 2-6, 3-7,
4-8 become closed.

A pin-for-pin chart would be great because I can't figure out how to
match up what was written above to my relay.

Thanks for your patience.

Sam

--

 

[Rheilly Phoull]

- 9
1___/
- 5

I hope you can read the ascii art, does this help ?

 

[ehsjr]

I am trying to follow the following schematic:
http://www.scied.science.doe.gov/nmsb/pdfs/Buzzerset.pdf


Radioshack no longer caries the listed 12V 4PDT relay. I was able to
get a hold of a different 12V 4PDT relay, however I don't know if I can

use it. I know nothing about the wiring of relays. The relay that I
found has 14 pins instead of the 12 listed in the schematic. The pins
are in 3 rows of 4 with the 13th and 14th pins on the 4th row and it
looks like they connect directly to the coil. (I can email you a jpg
of the schematic of the relay if this helps).


Any help or direction would be appreciated.


Thanks,
Sam

Compare your new relay to the old relay to see
if they are physically the same. My bet is that
they are.

If they are not, we'll need a schematic of
the existing wiring to see what goes where.

Normally on a 4PDT relay, the pins are grouped
like this, in order left to right:
NC (Normally Closed), NO (Normally Open), COM (Common)
1,5,9
2,6,10
3,7,11
4,8,12
13 14
The coil is pins 13 and 14. Or if you change the
orientation:

1 2 3 4 NC (Normally Closed) pins
5 6 7 8 NO (Normally Open) pins

9 10 11 12 COM (Common) pins

13 14 Coil

See the picture at the bottom of:
http://dkc3.digikey.com/PDF/T061/1456.pdf

Ed

 

[[email protected]]

Thank you all for your helpful answers. I was able to successfully
follow the schematic and the buzzer system is working. Could not have
done it without your help.

Sam