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BMY watt reading or amp reading  Rate Topic 
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 Posted: Sun Jan 6th, 2019 02:45 pm
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Lawrence Smith
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Does anyone have kilowatt readings from their BMY? Expecially 6 wing versions? I have 2 one starting in the 400 & one in the 500 & the amp readings are  way different. Neither fan has had more that a quick clean/rotor oil down done. thanks   

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 Posted: Sun Jan 6th, 2019 10:01 pm
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Lawrence Smith
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 Posted: Mon Jan 7th, 2019 01:56 pm
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Jim Humphrey
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I'm not sure what you're referencing as 400 and 500, but I used a Kilowatt meter on a 6 blade BMY kidney fan.  I left the oscillator disengaged to remove any difference the oscillation would have had.  The readings I got were Watts - 98, Amps - 1.12.  Hope this helps.  Oh, forgot to mention, this was at a nominal 120 V.  Jim

Last edited on Mon Jan 7th, 2019 01:59 pm by Jim Humphrey

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 Posted: Mon Jan 7th, 2019 02:17 pm
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Lawrence Smith
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Jim, thanks, the  BMY's serial #'s are what I was referring too. ( I don't know how else to id them) I have now tested a 390XXX .95 amp , a 498xxx .60 amp & a 598XXx .86 amp -- these are all 12"  6 blade fans, my concern is the 498 amp is so much lower than the other 2. I ran them all for over 30 minutes at line voltage on high speed with no visible  issues, luke warm at best on the motor housings.  

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 Posted: Mon Jan 7th, 2019 06:07 pm
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Jim Humphrey
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Yeah, I don't think it pays any great dividends to try to get absolutely precise parameters on most of these old fans simply because they tend to operate OK regardless of what the readings are (unless they're really goofy).  If they operate without getting hot, they're OK.  If they don't work at all or get real hot, there's a problem.  I guess the BMYs would also vary a bit just normally because some use centrifugal starts, some use resistance rings for phase shift, and some have resistance wound into the stator.  I don't think the centrifugal start was used on either of the S/Ns you mentioned, it was earlier.

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 Posted: Tue Jan 8th, 2019 08:56 pm
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Lawrence Smith
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thanks again Jim, I thought it strange that the middle series bmy #498 used much less power than either the 390 or the 598 unit, none of them ran hot after 30+ minutes & all sounded fine  

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