Wiring diagram
changing out a bad motor, have to rewire it. I have four wires: 2 hots 1 ground 1 Neutral, the way they have it set up is two rib relays I believe, to control whether it’s high or low speed. They’re using the NO wire on the rib with a 24V coil, There are two of them, for high and low speed that makes the most sense to me. I wired up the motor the new one is the leeson,that diagram makes no sense on where my wires are supposed to go. Where is the Neutral supposed to land? Where is the hot supposed to land. I had wired it up and I just heard a pop so it probably is wired incorrectly. How would you wire with what I’ve said here? Thanks
update: 02/26/25 Wired the unit I had to put my neutral on the ungrounded line side. Where the WHT wire is located, and wired in my two hots at 2 and 3( Hi-Lo speeds). Also had a bad rib relay must’ve been destroyed by the mis- wiring. ALL SET THANKS FOR THE HELP
Comments
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"Ungrounded Line" is the hot. The new motor is switching the neutral for the two speeds.
I don't have any experience with that motor so I can't say for sure, but it might work just fine to make the "ungrounded line" the neutral & the speed select wires the hots, which seems to match what you took out.
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"I had wired it up and I just heard a pop so it probably is wired incorrectly. How would you wire with what I’ve said here? Thanks"
That sounds like the motor might have lost the factory installed smoke when you heard the POP. If it did not melt any windings, and you get really lucky that POP may have been an internal overload that may reset. after things cool down.
The RIB relay has SPDT contacts so that both the High speed winding and the Low speed winding can not get 115 Volt AC at the same time. 115 V hot gets put on the Common of the SPDT relay and the contacts will swap from one speed to the other speed opening and closing the contacts based on the relay coil being powered or not being powered.
Sometimes it is better to take a picture of the wires before you remove them from the old part before you put them on the new part. This way you can reference them at times like this.
Do you have the equipment wiring diagram that the RIB relays and the motor are connected to?
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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damn, I found the wiring diagram on the unit to be confusing. I think there may be an overload an automatic one that opens and resets based on temp but you are correct I also could’ve just fired the motor.
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Pretty much what I did and it doesn’t seem to want to work. I’ll have to go over it again could be just something done wrong.
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Post a picture of the wiring diagram for the equipment
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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unfortunately neglected equipment without a wiring diagram.(Exhaust Fan)
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this is exactly how I wired it. I am going back tomorrow but, that’s exactly how I have it.
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damn, I found the wiring diagram on the unit to be confusing. I think there may be an overload an automatic one that opens and resets based on temp but you are correct I also could’ve just fired the motor.
Does unit mean the exhaust fan or the new motor? Can you post the confusing wiring diagram?
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Not sure if it matters but the terminal on the motor you have the white neutral going to says, "ungrounded wire" Don't know why the MFG marked it that way. I think you may have to switch the hot and neutral feeding the rib so that the rib is switching the neutral
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Disconnect all the wires from the motor including the ground. Check it with an ohm meter.
You should have ohms between 2 & 4 and 3& 4.
You should not have continuity between 2, 3,4 and the frame of the motor. If you do it is probably toast
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i can't imagine why that would matter in this application.
that diagram looks like it maybe was a 240v or 3 phase 208 v diagram that was modified for 120v by someone that didn't quite know what they were looking at.
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Its an ac motor so obviously it will work either way. Maybe it has something to do with thermal protection
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I am talking about the motor wiring diagram, the exhaust fan currently does not have a wiring diagram or a tag to get a serial/ model.
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Then if this does not work, I would return the motor and tell the supplier that this motor is not properly labeledIncorrect wiring illustration removed.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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I thought I had it this way, my neutral was on 5 where blue is, instead of where you have it in that photo.
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You might've let the smoke out of the motor. Wire it up correctly & see if it still runs. Try both speeds, & both directions.
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you put the hot to the common on a compressor with a potential relay because the overload is on the common since the potential relay has to winding connection so if the windings or connections short to ground the overload is still between hot and ground. if the hot were on the potential relay any of the connections shorting to ground would permanently energize the windings.
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Then my first diagram is correct. did the motor still work?
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Yes it did in fact
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