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arisah1
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Join Date: Jan 2013
Posts: 2

LV Motor on Solo Run and Tripping with High Current

01/21/2013 12:01 PM

I have a question and it goes thus:
A motor Filter Fan's RPM on motor data plate is 3545 RPM, Relay overload set is 2.9A. During solo run, motor runs at 1.6A (starting current) at 3615 RPM. The LV motor tripped at 4.9A with enclosure door closed during load run. What are the possible causes of the motor trip? What can be done to avoid such trippings? (What are your recommendations?)
(the motor specification are: Voltage = 460 V, Power = 1.5kW (2HP), No. of Phase = 3,Frequency = 60Hz,No. of poles = 2)
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lyn
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#1

Re: LV Motor on solo run and tripping with high current

01/21/2013 12:19 PM

What is FLA or LRA of the motor?
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Kilowatt0
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#2

Re: LV Motor on solo run and tripping with high current

01/21/2013 12:33 PM

"the motor specification are: Voltage = 460 V, Power = 1.5kW (2HP), No. of Phase = 3,Frequency = 60Hz"

Good information, but only half of the equation. What are you supplying the motor 480 V, 50 Hz ...?

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ozzb
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#3

Re: LV Motor on Solo Run and Tripping with High Current

01/21/2013 4:33 PM

Does the enclosure have an exhaust opening? Is the opening large enough to handle the cfm of the fan? How many cfm is the fan rated for? How large is the enclosure?

Since it work fine until you closed the door. Making a guess the enclosure is sealed and there is no where for the air to go but back out against the the fan blades stalling them.

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lyn
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#4

Re: LV Motor on Solo Run and Tripping with High Current

01/21/2013 5:02 PM

What does the MOTOR NAMEPLATE say???????
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TonyS
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#5

Re: LV Motor on Solo Run and Tripping with High Current

01/21/2013 7:10 PM

Looks like homework.

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arisah1
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Posts: 2
#6

Re: LV Motor on Solo Run and Tripping with High Current

01/22/2013 12:51 AM

The motor's FLA is 3.4 Amps, supply voltage is 480V, supply frequency is 60Hz, Filter Fan Type is Centrifugal, there vents for inlet and outlet of air.Design flow for fan is 2750m3/hr.
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ozzb
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#7
In reply to #6

Re: LV Motor on Solo Run and Tripping with High Current

01/22/2013 7:25 AM

How big is this enclosure? How large are the exhausting vents? Are we pushing or pulling?

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JRaef
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#8

Re: LV Motor on Solo Run and Tripping with High Current

01/23/2013 4:21 PM

You likely have a measurement problem of some sort, or you are leaving out a whole bunch of details. If you have a 2 pole motor that is connected to a 60Hz system, it cannot be running at 3615RPM unless something else is over driving it to that speed. The synchronous speed would be 3600RPM, at which it would have zero torque.

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Users who posted comments:

arisah1 (1); JRaef (1); Kilowatt0 (1); lyn (2); ozzb (2); TonyS (1)

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