3~ Motor rating amps?

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  #1  
Old 08-21-07, 06:38 AM
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3~ Motor rating amps?

I got an American 3-phase motor. It is labeled:

RPM: 1740 Hz: 60
V.: 208-240

F.L.A.: 8.8-9.2

S.L.A.: 9.6-10

What does the F.L.A tell?
and
What does the S.L.A tell?

Thank you!
 

Last edited by d_s_k; 08-21-07 at 06:39 AM. Reason: edit error
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  #2  
Old 08-21-07, 08:11 AM
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The FLA is the full load amps or the amperage the motor will draw if it is doing its rated horsepower worth of work.
 
  #3  
Old 08-21-07, 08:14 AM
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If I am not mistaken, F.L.A. is the Full load amps (current) and S.L.A. is the starting load amps. (The current ratings of the motor).
 
  #4  
Old 08-21-07, 08:33 AM
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Thank you!
Quit logic, when you tell me.

Then I can put on an motor protecting switch (thermic) rated to 9.2 amps.

Again
Thank you!
 
  #5  
Old 08-21-07, 08:46 PM
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Dsk ;

let me add one more thing to the list

add 25 % for O/L device

8.8-9.2 amp at 240 v 3 supply

set the O/L at 11.5 amp unless you have something that can be get jammed up for some reason then drop the OL a little

DSk i know you are in european area i just want to give you a gentle reminder to use the class C overload relays or sensors that will handle the common start up loading on the motors


thanks , Marc

i am sure you understand you may have to derate the motor a little due the differince in the HZ suppy you will only get 5/6 of the speed and also the 5/6 of hp rating as well
 
  #6  
Old 08-21-07, 10:44 PM
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One correction the S.L.A. is not the starting load amps it is the service load amps that the motor runs at when loaded at its service factor usually 1 to 1.15

roger
 
  #7  
Old 08-21-07, 11:45 PM
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Talking

Thank you again.

On the other side of the motor It is another plate;

50Hz
190-220V
F.L.A. 9.2-10.4

S.F.A 10-10.8

380-440V
F.L.A. 4.6-5.2

S.F.A 5-5.4

In Norway we have 2 systems: 3-phase 230V And 400V (both systems made to 230V single phase possible)

Then I can put on an adjustable motor protecting switch (thermic) rated to 4-6.3 amps.
for the 400 V system, or 10-16 amps for the 400V system.

These motor protecting switch es copes with 2-3 times the load for a start periode of a few seconds.

dsk
 
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