Delta Motor Taking More Current

If started DOL in delta, the motor can take 6-10 times the rated current during starting, 70A seems just about ok, though rather high. Running current of 15A is not ok at all. All three lines take 15A? Or only one ? If one, then some short in one winding.

Dear sir

Motor staring with DOL only and all three phase is taking almost is same current 15 A.

with regards

JCG

Then this is rather strange. It is behaving like a 7.5 kW motor. i am sure you would have checked with the motor manufacturer, what does he say? If the motor was to be run as a star-connected one, the star point would have been made inside and you would have access to only three leads, so it seems to be meant to run in delta mode.

This motor make by ABB Type EHX132SMB2 (6 lead out) and supplied through our contractor they are communicating with with ABB and we are waiting for their reply.

Thanks

JCG

Does the motor new or rewinded? If rewinded then there may be defect in rewinding.

Its new motor

Most likely #5 by JRaef is right. The current when star-connected seems to be the rated one. You can also see if you have 3φ 240V and check the motor in Delta.

It sounds it could be phase reversal

IE

A1 > A2

B2 > B1

C1 > C2

In addition to the all points as already stated, please also check the airgap between rotor and stator and condition of bearings i.e. whether there is any jamming or defects in bearings.

check the nameplate or cover of motor. you will see delta - y connection for 230v and 380v. this means your motor can run on either supply and mostly delta for 230v 3phase supply and 380v 3phase for y.

Dear Sir

The motor nameplate details are as given below

Make : ABB

Type : EHX132SMB2

Duty : S1

Sl. No : 436501

KW /HP : 3.7/5.5

Speed : 2915 RPM

Voltage : 415V

Frequency : 50Hz

Current : 6.5A

Power factor : -

Efficiency : 86%

Connection : DELTA.

Bearing DE : 6308ZZC3

Bearing NDE : 6307ZZC3

Winding Resistance Test: (Values in Ohms) (Using Equipment Details)

Equipment: Multimeter : Make: fluke Range: 0-1000v

Regads

JCG

mostly motor of 380v and above are on y connection. maybe you are confuse of d in the nameplate. please check the cover of motor connection usually the right connection is inscribe inside of the cover. for a high starting load since this a small motor take some further examination. open it and check the bearing and insulation. if found okay. check the contactor (contact point) that supply the power.

lastly refer to manufacturer.

Dear sir

In star position motor running smoothly, (running current is 5.5 A) that means no more jamming

Regards

JCG

kindly send all the information you see in the nameplate.

Take a good look at the name plate. You will most likely find that it is 415V star connected and 240V delta connected. A lot of the cheaper motors are comming out this way, the electricians at our plant have been caught several times with this.

In star connection couple the motor with load & check motor current & temperature rise, if found abnormal it showes defective winding, OR check by rewinder.