Motor question

Posted by Van Chocstraw on October 30, 2009, 9:41 pm

jeff_wisnia wrote:

> HeyBub wrote:

>> I have a 115v, 1 1/8 HP motor with a faceplate rating of 13 Amps. It
>> actually draws 17 Amps (according to the Kill-A-Watt) with no load.
>> Does the difference mean anything important?
>> Thanks in advance for any advice.
>> P.S.
>> I haven't run the motor for more than a couple of minutes...

>
> Is it possible for you to check the current draw with another kind of
> meter, say a conventional clamp-on ammeter?
>
> That 17 amps being drawn when unloaded sure doesn't sound correct to me.
>
> Jeff
>

I don't believe the 13 amps either with no load. That 13 amps is at it's
rated horsepower load.

Posted by John Grabowski on October 30, 2009, 7:48 am

>I have a 115v, 1 1/8 HP motor with a faceplate rating of 13 Amps. It
>actually draws 17 Amps (according to the Kill-A-Watt) with no load.
> Does the difference mean anything important?
> Thanks in advance for any advice.
> P.S.
> I haven't run the motor for more than a couple of minutes...

*With one horsepower equaling 746 watts even the nameplate rating sounds a
little high. If it is still high with your ammeter you could have a bad
bearing, but you should be able to hear that.

Let us know what you find.

Posted by HeyBub on October 30, 2009, 8:41 pm

John Grabowski wrote:

> *With one horsepower equaling 746 watts even the nameplate rating
> sounds a little high. If it is still high with your ammeter you
> could have a bad bearing, but you should be able to hear that.
> Let us know what you find.

The faceplate reads a clear "13.5 Amps."

Both the Kill-A-Watt (reluctantly) and a clamp-on ammeter show about 18-18.6
amps being drawn.

Interestingly, the clamp-on shows 18.5 amps on one wire and 16 on the other.
The difference must be in heat. Or condensation.

Posted by BQ340 on October 30, 2009, 9:05 pm

HeyBub wrote:

> John Grabowski wrote:

>>> I have a 115v, 1 1/8 HP motor with a faceplate rating of 13 Amps. It
>>> actually draws 17 Amps (according to the Kill-A-Watt) with no load.
>>> Does the difference mean anything important?
>>> Thanks in advance for any advice.
>>> P.S.
>>> I haven't run the motor for more than a couple of minutes...

>> *With one horsepower equaling 746 watts even the nameplate rating
>> sounds a little high. If it is still high with your ammeter you
>> could have a bad bearing, but you should be able to hear that.
>> Let us know what you find.

>
> The faceplate reads a clear "13.5 Amps."
>
> Both the Kill-A-Watt (reluctantly) and a clamp-on ammeter show about 18-18.6
> amps being drawn.
>
> Interestingly, the clamp-on shows 18.5 amps on one wire and 16 on the other.
> The difference must be in heat. Or condensation.
>
>

How does your actual utility voltage compare to the motor's nameplate
voltage?

Posted by on October 30, 2009, 10:44 pm

wrote:

>John Grabowski wrote:

>The faceplate reads a clear "13.5 Amps."
>Both the Kill-A-Watt (reluctantly) and a clamp-on ammeter show about 18-18.6
>amps being drawn.
>Interestingly, the clamp-on shows 18.5 amps on one wire and 16 on the other.
>The difference must be in heat. Or condensation.

Cannot be. What flows in the one wire MUST flow in the other unless
you have a SERIOUS ground fault.

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Motor question - Page 4