Reason for motor running hot

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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

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