Dear Friends,
From last week i have been facing a problem of Overheating of 55Kw ABB Induction motor. Motor is getting supply from ABB VFD (ACS600 SAMI GS) to drive Vertical Screw conveyor. Motor Ratted Amps is 96A. Even though the Motor Current at peak load is less than 90Amps it is getting tripped due to Overheating of Motor. The current to the Motor varies from 46Amps to 90Amps depending on load. On physically touching the Motor is getting very hot and insulation resistance in reducing to 20 Mega Ohms (Line to Ground). Before It used to trip in every 4-5 hrs of running period, but now its tripping in every
2-2.5hrs of running period.
Interesting details of Motor:-
1. the motor is recently serviced one. It has been installed just 3 weeks ago after it has been re-winded and shaft bearing replaced.
2. The Previous Motor had play in shaft due to damage housing. It has been sent to workshop. Hence currently we don't have any spare motor.
3. Motor is driving the Screw conveyor via V-Belts pulley arrangement.
4. While running enough vibration has been noticed for both screw and Motor at place of mounting.
Kindly suggest me what can be possible cause of Overheating. Is it due to vibration or due to some electrical fault.
thanking you
best regards.
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