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Anonymous Poster

power rating

03/26/2008 9:04 AM

in our site there is some motors with dual voltage rating .i.e 230/460 v with FLA 17.2/8.6 A.and in name plate it is also noted hat 7.5/5 hp.my doubt is how it come 2 power rating?

as per calculation output we will get 5 hp.but what is this 7.5 hp?any body please clarify me..
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chaterpilar
Power-User

Join Date: Aug 2007
Location: Bhopal India
Posts: 234
Good Answers: 5
#1

Re: power rating

03/26/2008 9:18 AM

Looks like a typo in name-plate

It is double voltage motor and HP should not change.(7.5)

cheers.

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gippsie
Active Contributor

Join Date: Mar 2008
Posts: 11
Good Answers: 1
#2

Re: power rating

03/26/2008 11:30 AM

Can't be 7.5hp continuous, as rated input power is only 3956VA - but 5hp is possible at either voltage. Maybe 7.5hp refers to brief periods of high loading where about 50% more current will be drawn (that is, about 26A at 230V and about 13A at 460V).
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pwr2thepeople
Guru

Join Date: Aug 2007
Location: Indiana, USA
Posts: 579
Good Answers: 61
#3

Re: power rating

03/27/2008 1:01 PM

Although not often seen in this power class, the 7.5 may be "peak" horsepower, voltage x locked rotor amps.

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