Mounting
4.7 Connecting the motor
BA 2320
Operating Instructions, 02/2015, 70000004023775
41
4.7.10
Operation on the converter
Permissible voltage stress
CAUTION
Converters without an output filter cause damage to the motor insulation due to
impermissible voltage peaks
Reduce the maximum motor voltage to noncritical values by using an output filter on the
converter.
①
Standard insulation
②
Reinforced insulation
U
pk
Pulse voltage
t
Rise time
Figure 4-8
Limit curves for the pulse voltage
Bearing currents
Additional bearing currents due to steep voltage edges when switching. Without output
filters, significant voltage variations can occur on the winding terminals. Make sure the drive
system is installed in accordance with EMC requirements.
Mechanical stress and grease lifetime
High speeds that exceed the rated speed and the resulting increased vibrations alter the
mechanical running smoothness and the bearings are subjected to increased stress. This
reduces the service life of the grease and bearings.
Optional add-on units
Connect the temperature sensor of the monitoring system and the anti-condensation heating
according to the appropriate circuit diagram. Only switch on the anti-condensation heating
after the motor has been switched off.
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