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joanaphiri
Active Contributor

Join Date: Jan 2011
Posts: 10

Voltage Determination

03/10/2011 9:53 AM

Hi,

How do you determine the Voltage of a motor whose name plate is missing? Is there a test to performe to tell you wheather the winding is 380 V or 550 V?

If you supply a Variable Speed Drive with 550V and connect to it a 380V Motor,and programme the drive according to the motor ratings that is 380V and so on.Will the VSD output be 380V or 550V?

Regards.
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rakesh_semwal
Guru
India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Oct 2006
Location: India, 200 Km. North of Delhi.
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#1

Re: Voltage Determination

03/10/2011 9:59 AM

If you program 380 It will not exceed it,
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Yuri B.
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Join Date: Jun 2009
Posts: 262
Good Answers: 1
#2

Re: Voltage Determination

03/10/2011 1:25 PM

Look around the place of its origin - sort of what supplies are there most common, what are other motors' voltages.

If you have 380 V and 550 V sources available, I think, connecting it to the first wont damage it - I mean without any load, for a very short time, and controlling its starting "behaviour," and its current with a clamp meter. If it has 6 leads, better to even try at first in the star connection.

It might even not get revolving, but the value of the start (locked rotor) current would tell you much. (You may further report here) Only be careful!
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