Today's Message Index:
----------------------
1. 04:15 AM - Re: off-topic question about AC electric motors (sheldon barrett)
2. 09:35 AM - Re: off-topic question about AC electric motors (Brian Meyette)
Message 1
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| Subject: | Re: off-topic question about AC electric motors |
If it's indeed a dual voltage motor, the name plate will indicate it...(115
v @ some amperage/230v @ half that amperage)... If the motors name plate
only says 230v. then it's probably a single voltage winding and there won't
be any taps to change.. It will eventually burn up running on low
voltage....
Sheldon
----- Original Message -----
From: "Russ & Marilyn" <rmkeith@gwi.net>
Sent: Monday, May 12, 2008 7:50 PM
Subject: Re: RV-List: off-topic question about AC electric motors
>
> Brian,
>
>
> Remove the access cover to the wiring and check to see if the motor is
> wired for lo voltage or high voltage. The internal taps may need to be
> simply placed on the correct terminal. Check the motor data plate for the
> correct tap arrangement.
>
> Russ
>
>
> ----- Original Message -----
> From: "Brian Meyette" <bmeyette@gmail.com>
> To: <rv-list@matronics.com>
> Sent: Monday, May 12, 2008 12:54 PM
> Subject: RV-List: off-topic question about AC electric motors
>
>
>>
>> This has nothing to do with RVs, but I know there are a lot of very
>> knowledgeable people out there and someone might know.
>>
>> The short question is - what will happen if you plug a 230v motor into
>> 115vac? Will it still run, albeit weakly?
>>
>> If you're interested, this is the long version - I bought an air
>> compressor
>> that the seller said had a motor problem. Rather than just replace the
>> motor, I tested it out, because sometimes you can actually buy things
>> that
>> are not as bad as expected, and just need a simple fix.
>>
>> The compressor came with a standard 15a, 115v 3-prong plug on it. So, I
>> disconnected the belt driving the compressor and tested the motor by
>> plugging it in. It ran fine. So, I connected the belt and let it try to
>> drive the compressor. It starts and runs ok, but then runs out of steam
>> and
>> starts to slow down. Then the start circuit kicks in and it picks up
>> speed
>> again, then slows down again.
>>
>> So, I figured the motor was indeed bad & I'd have to replace it. But,
>> after
>> looking at the motor data plate to see what to order, it clearly says it
>> is
>> a 5 HP GE 230 volt only (not 115/230) motor. The whole thing is well
>> used,
>> so someone in its past must have been using it successfully. Perhaps the
>> previous owner (or one before that) either had a 230v circuit with a 115v
>> outlet on it (REALLY bad idea) or perhaps the guy I bought it from got it
>> without a plug on the end, assumed it was 115v and put the 115v plug on
>> it &
>> then saw it didn't work, so he sold it.
>>
>> So, I am planning to put a 230v plug on it and try it in a 230v circuit.
>> I
>> guess I dont have anything to lose if somehow it is really 115 and I put
>> 230 to it & burn it up , as I would otherwise have to replace the motor
>> anyway, because it is too weak at 115v. I just wondered if it was
>> feasible
>> that it really is a 230v motor and all it needs is a 230v supply.
>>
>> What do you guys think - will a 230v motor run, but weakly, on 115v?
>>
>> Thanks,
>> brian
>>
>> Checked by AVG.
>> 1:08 PM
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 2
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| Subject: | off-topic question about AC electric motors |
Thanks to all for the advice. I tried hooking it to 230v last night and it
ran great. It's definitely a 230v-only motor, and there's nothing wrong
with it. So the motor alone is worth way more than the price I paid for the
whole compressor. Odd that it came with a 115v plug that threw me. the
seller must have bought the compressor somewhere (perhaps an auction),
probably without a plug, installed that 115v plug, thinking it was 115v,
then sold it cuz it didnt work well. I lucked out on that transaction, as
I was expecting to have to buy a new motor for it when I bought it.
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of sheldon barrett
Sent: Tuesday, May 13, 2008 7:11 AM
Subject: Re: RV-List: off-topic question about AC electric motors
If it's indeed a dual voltage motor, the name plate will indicate it...(115
v @ some amperage/230v @ half that amperage)... If the motors name plate
only says 230v. then it's probably a single voltage winding and there won't
be any taps to change.. It will eventually burn up running on low
voltage....
Sheldon
----- Original Message -----
From: "Russ & Marilyn" <rmkeith@gwi.net>
Sent: Monday, May 12, 2008 7:50 PM
Subject: Re: RV-List: off-topic question about AC electric motors
>
> Brian,
>
>
> Remove the access cover to the wiring and check to see if the motor is
> wired for lo voltage or high voltage. The internal taps may need to be
> simply placed on the correct terminal. Check the motor data plate for the
> correct tap arrangement.
>
> Russ
>
>
> ----- Original Message -----
> From: "Brian Meyette" <bmeyette@gmail.com>
> To: <rv-list@matronics.com>
> Sent: Monday, May 12, 2008 12:54 PM
> Subject: RV-List: off-topic question about AC electric motors
>
>
>>
>> This has nothing to do with RVs, but I know there are a lot of very
>> knowledgeable people out there and someone might know.
>>
>> The short question is - what will happen if you plug a 230v motor into
>> 115vac? Will it still run, albeit weakly?
>>
>> If you're interested, this is the long version - I bought an air
>> compressor
>> that the seller said had a motor problem. Rather than just replace the
>> motor, I tested it out, because sometimes you can actually buy things
>> that
>> are not as bad as expected, and just need a simple fix.
>>
>> The compressor came with a standard 15a, 115v 3-prong plug on it. So, I
>> disconnected the belt driving the compressor and tested the motor by
>> plugging it in. It ran fine. So, I connected the belt and let it try to
>> drive the compressor. It starts and runs ok, but then runs out of steam
>> and
>> starts to slow down. Then the start circuit kicks in and it picks up
>> speed
>> again, then slows down again.
>>
>> So, I figured the motor was indeed bad & I'd have to replace it. But,
>> after
>> looking at the motor data plate to see what to order, it clearly says it
>> is
>> a 5 HP GE 230 volt only (not 115/230) motor. The whole thing is well
>> used,
>> so someone in its past must have been using it successfully. Perhaps the
>> previous owner (or one before that) either had a 230v circuit with a 115v
>> outlet on it (REALLY bad idea) or perhaps the guy I bought it from got it
>> without a plug on the end, assumed it was 115v and put the 115v plug on
>> it &
>> then saw it didn't work, so he sold it.
>>
>> So, I am planning to put a 230v plug on it and try it in a 230v circuit.
>> I
>> guess I dont have anything to lose if somehow it is really 115 and I put
>> 230 to it & burn it up , as I would otherwise have to replace the motor
>> anyway, because it is too weak at 115v. I just wondered if it was
>> feasible
>> that it really is a 230v motor and all it needs is a 230v supply.
>>
>> What do you guys think - will a 230v motor run, but weakly, on 115v?
>>
>> Thanks,
>> brian
>>
>> Checked by AVG.
>> 1:08 PM
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Checked by AVG.
6:14 PM
Checked by AVG.
6:14 PM
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