Manual for High Voltage Process Performance Motors
Trouble Shooting - 69
3BFP 000 063 R0101 REV D
8.1.3 Thermal performance
8.1.3.1 Thermal performance, rib cooled
NOTE: For high bearing temperature, see Chapter 8.1.2 Lubrication system and bearings.
8.2 Electrical performance, excitation, control and protection
The electrical performance of a rotating electrical machine is mostly defined by the condition of
the rotor and stator windings, and the operation of the excitation system, if applicable. The main
machine winding maintenance is described in Chapter 7.6 Maintenance of stator and rotor
windings. In this chapter, the focus is on the trouble shooting of the excitation, the control and
protection systems.
8.2.1 Protection trips
The machine needs to be protected with alarms and trips for abnormal running conditions, both
electrical and mechanical. Some of these protections can be reset and the machine restarted
directly as the fault is located.
Trouble shooting
Thermal performance
rib cooled
Overload
Control system setting
Check machine controls, eliminate overload
Overspeed
Check actual speed and ABB speed recommendations
Network unbalance
Check that network balance fulfils requirements
Faulty instrumentation or measurement system
Check measurements, sensors and wiring
Too many starts
Let the machine cool down before restarting
Check windings
Dirty machine exterior
Clean machine exterior
z
Air flow is reduced
Remove obstacles. Ensure sufficient air flow,
see Dimension
Drawing of the machine
z
z
Winding fault
z
z
z
z
z
Experienced
malfunction
H
igh winding te
m
p
e
ra
tur
e
Possible cause
Corrective action
