5. Low voltage motors in variable speed operation .............................................................................. 11
5.1 Introduction ..................................................................................................................................... 11
5.2 Winding insulation ........................................................................................................................... 11
5.2.1 Phase to phase voltages ...................................................................................................... 11
5.2.1 Phase to ground voltages .................................................................................................... 11
5.2.3 Selection of winding insulation for ACS550- and ACS800-converters ................................... 11
5.2.4 Selection of winding insulation with all other converters ........................................................ 11
5.3 Thermal protection of windings ....................................................................................................... 11
5.4 Bearing currents .............................................................................................................................. 12
5.4.1 Elimination of bearing currents with ABB ACS550 and ACS800 converters .......................... 12
5.4.2 Elimination of bearing currents with all other converters ........................................................ 12
5.5 Cabling, grounding and EMC .......................................................................................................... 12
5.6 Operating speed ............................................................................................................................. 12
5.7 Dimensioning the motor for variable speed application .................................................................... 12
5.7.1 General ................................................................................................................................ 12
5.7.2 Dimensioning with ABB ACS800 converters with DTC control .............................................. 12
5.7.3 Dimensioning with ABB ACS550 converters ......................................................................... 13
5.7.4 Dimensioning with other voltage source PWM-type converters ............................................. 13
5.7.5 Short time overloads ............................................................................................................ 13
5.8 Rating plates ................................................................................................................................... 13
5.9 Commissioning the variable speed application ................................................................................ 13
6. Maintenance .......................................................................................................................................... 14
6.1 General inspection .......................................................................................................................... 14
6.1.1 Standby motors ......................................................................................................................14
6.2 Lubrication ............................................................................................................................................... 14
6.2.1 Machines with permanently greased bearings ...................................................................... 14
6.2.2 Motors with regreasable bearings ......................................................................................... 15
6.2.3 Lubrication intervals and amounts ........................................................................................ 15
6.2.4 Lubricants ............................................................................................................................ 17
7. After Sales Support ............................................................................................................................... 18
7.1 Spare parts ..................................................................................................................................... 18
7.2 Rewinding ....................................................................................................................................... 18
7.3 Bearings ......................................................................................................................................... 18
8. Environmental requirements ................................................................................................................ 18
8.1 Noise levels ..................................................................................................................................... 18
9. Troubleshooting .................................................................................................................................... 19
EN-4
ABB Motors and Generators |
Low voltage motor manual 01-2009
