Activities Carried out During Weekly Maintenance of 3 ph. Induction Motor:
1) Check belt tension. In cases where this is excessive it should immediately be reduces and in the case of sleeve bearing machines the air gap between rotor and stator should be checked. 2) Blow out windings of protected type motors, situated in dusty locations. 3) Examine starting equipment for burnt contacts where motor is started and stopped frequently. 4) Examine oil in the case of oil ring lubricated bearings for contamination by dust, dirt, etc (This can be roughly ascertained on inspection by the colour of the oil)
OR
Preventive maintenance on a weekly basis includes remedial measures for the following; 1) Start each motor to determine if it comes up to speed within the normal time frame. 2) Measure line current and compare to previous records and if it is within the FLC of the motor‟s nameplate rating. Line currents should be balanced with in the tolerance limits. 3) Listen to each motor for any unusual noises. 4) Inspect switches, fuses, starter, and other control equipment. 5) Observe any excessive sparking of brushes. 6) Check lubricant levels of bearings and look for any leaks. 7) Look for corrosion on slip rings. 8) Check brushes for excessive sparking while the motor is running. 9) Check oil rings for rotation with the shaft for the motors that have this arrangement. 10) For motors lubricated and cooled by oil mist systems its important to check the oil mist flow paths/pressure components.