Thermal Performance; Thermal Performance, Rib Cooled; Electrical Performance, Excitation, Control And Protection; Protection Trips - ABB AMA Manual

8.1.3 Thermal performance

8.1.3.1 Thermal performance, rib cooled

Experienced
malfunction

8.2 Electrical performance, excitation, control and protection

8.2.1 Protection trips

3BFP 000 063 R0101 REV D
Trouble shooting
Thermal performance
rib cooled
Possible cause
Control system setting
Overload
Overspeed
Network unbalance
Faulty instrumentation or measurement system
Too many starts
Winding fault
Dirty machine exterior
Air flow is reduced
NOTE: For high bearing temperature, see Chapter 8.1.2 Lubrication system and bearings.
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.
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.
Manual for High Voltage Process Performance Motors
Corrective action
Check machine controls, eliminate overload
Check actual speed and ABB speed recommendations
Check that network balance fulfils requirements
Check measurements, sensors and wiring
Let the machine cool down before restarting
Check windings
Clean machine exterior
Remove obstacles. Ensure sufficient air flow, see Dimension
Drawing of the machine
Trouble Shooting - 69