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Relay-87A vs 87Q

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Bacongrease

Tuned and Synch'ed
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so, what is the difference between 87A and 87Q ?
The auto parts guys don't know.
they are at the same location on the relay. ? ?
 
I do not claim to be an electrical engineer at all.

In “Start Trek” terminology, one is “matter” while the other is “anti-matter”.


FWIW:

87Q Operating Signal

It is beneficial to realize that the 87P and 87Q operating signals are related. The 87P operating signals are per-phase sums of the phase zone currents. The 87Q operating signal is the sum of the negative-sequence components of all the phase zone currents.
 
I do not claim to be an electrical engineer at all.

In “Start Trek” terminology, one is “matter” while the other is “anti-matter”.


FWIW:

87Q Operating Signal

It is beneficial to realize that the 87P and 87Q operating signals are related. The 87P operating signals are per-phase sums of the phase zone currents. The 87Q operating signal is the sum of the negative-sequence components of all the phase zone currents.



?



.
 

Exactly!

The 87a and 87b are DIN designations.
I couldn’t even find a 87q reference at the DIN website.

The only 87q relay info I found was a scientific paper with that explanation in the introduction.

I searched for quite some time and couldn’t even find a 87q relay to look at.

DIN relays almost always have the schematic of the relay construction right on the housing itself. No luck with an 87q.
 
Yeah, I was curious as well when this thread popped up, and started doing some reading. I'm no electrical engineer, but it really does seem that "87Q" is referring to something entirely different than automotive relays. I'm not surprised the parts guy was baffled.

__Jason
 
I just happened to have 3 different relays (of the same type) sitting here at my desk. Mostly everything you need to know is stamped on the side.

Pinout:
1 = 85 (coil)
2 = 86 (coil)
3 = 30 (common)
4 = 87a (normally closed)
5 = 87 (normally open)

IMG 1250

__Jason
 
Do you have a multimeter and a 12v source? A little logic and those 2 items make it quit easy for you to work it out.
 
Or , #85 is the ground
#86 is power from the switch
#30 is main power in
#87 is main power out (to operate the switched device) ie; power to a starter solenoid
Peter
 
Not heard of 87q either but here is a good guide for "Automotive Relays" (I guess that covers us)

12voltplanet.co.uk

"It's a relay Jim, but not as we know as it" - all together now
"there's klingons on the starboard bow, starboard bow, starboard bow........"
 
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