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#1
Start by
Harendra Singh Gurjar
08-07-2014 04:28 PM

Induction motor 415 volt, 16A FLA taking current 9A, 29A, 21A

One Induction motor 415 volt, 16A FLA taking current 9A, 29A, 21A. Resistance is same phase tom phase IR is healthy . What cab be problem in motor? After replacing same motor with other motor ,new motor is working well without any unbalance current .
Problematic motor is new motor and after one month use showing above mentioned problem .cage rotor is used in motor . Motor is not jam and there was no significant vibration and sound in motor.
08-07-2014 06:57 PM
Top #2
Matthew Pilgrim
08-07-2014 06:57 PM
Hi Harendra,
Have you measured the phase voltages?
08-07-2014 09:28 PM
Top #3
Ing. Ole Knudsen
08-07-2014 09:28 PM
Could easily be a loose connection, or incorrect crimp of a lug onto the cable core.
08-07-2014 11:50 PM
Top #4
Harendra Singh Gurjar
08-07-2014 11:50 PM
Matthew Pilgrim sir and g. Ole Knudsen sir ,
I measured voltage at motor terminal and voltage was equal in all phases . After replacing the motor with other motor keeping same power cable ,new motor is running well .
08-08-2014 01:51 AM
Top #5
Harendra Singh Gurjar
08-08-2014 01:51 AM
There is no saprking or flashover in motor terminal .
08-08-2014 03:59 AM
Top #6
m aseem siddiqui
08-08-2014 03:59 AM
Harendar , Have you checked its Rotor.
08-08-2014 06:35 AM
Top #7
Harendra Singh Gurjar
08-08-2014 06:35 AM
Mr. m aseem siddiqui - Rotor is not checked . But Motor was running well for almost 6 month and there was no vibration problem . Cage rotor is used in motor ,so there is less chance of rotor creak.
08-08-2014 09:15 AM
Top #8
Ing. Ole Knudsen
08-08-2014 09:15 AM
Have you tested it again after having it disconnected?
Did you test the individual windings resistance after disconnecting it?
08-08-2014 10:06 AM
Top #9
Mike
08-08-2014 10:06 AM
If maintenance is done with motor and all 6 terminals are disconnected from the motor terminal then it is very common that the change of direction of phase winding for example the terminal on motor connector is for A1 side of the A winding and wrongly placed with A2 side, when making Y or Delta connection it will create an Amp Un-Balance but it will not allow to run for a while so if the case is like this make sure. For rotor even cage type some time because of manufacturing defect molded bar is broken and such phenomena is developed but important is Slip increased ( speed on Load reduced).
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