Mechanical
problem
1. Bearing wear down
2. P/P impeller jam
3. P/P gland too tight
4. Any blockage
5. Shaft installignment-(after o’haul)
6. Fan not working
7. Cooling fan dirty – too much painting
Electrical
problem
1. Single phasing
2. High voltage – speed-high/load-high/overheat
3. Low voltage – current increase to maintain require torque
4. Low frequency –flux-high/current-high/fan speed-low
5. High frequency – speed-high/load-high
6. Repeated start/stop
7. Prolong starting
8.
Delta connected motot start on
star & run on star
