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Manual for Induction Motors and Generators
96 -
Trouble Shooting
3BFP 000 050 R0101 REV E
***Following chapter for cooling type: Air-to-air
8.1.3.2 Thermal performance, air-to-air cooling system
NOTE: For high bearing temperatures, see
Table 8.1.2 Lubrication system and bearings
Trouble shooting
Thermal performance
air-to-air cooling system
H
igh
winding
te
m
p
erat
ure
H
igh
cooling
a
ir
te
m
p
erat
ure
z
z
Damaged cooling fan(s)
Replace fan(s)
z
z
Fan rotating in wrong direction Replace fan(s)
z
z
Dirty machine interior
Clean machine parts and air gaps
z
z
Damaged external fan
Replace fan
z
z
Fan rotating in wrong direction Change shaft mounted fan or correct external blower motor operation
z
z
Leaking cooler
Repair cooler
z
z
Ambient temperature too high
Add ventilation to decrease ambient temperature
z
z
Exiting air is pulled back in
Ensure sufficient clear distances surrounding the cooler
z
z
Heat source nearby
Place heat sources further away, check ventilation
z
Overload
Control system setting
Check machine controls, eliminate overload
z
z
Overspeed
Check actual speed and ABB speed recommendations
z
Network unbalance
Check that network balance fulfils requirements
z
z
Faulty instrumentation or measurement system
Check measurements, sensors and wiring
z
Too many starts
Let the machine cool down before restarting
z
Winding fault
Check windings
High intake air
temperature
Low secondary cooling
circuit performance
Corrective action
Experienced
malfunction
Low primary cooling
circuit performance
Possible cause