Lenze 931E/K Small Drives Control - Manual (Page 142)

Appendix
Parameterisation of outside motors
Power stage
10
l
142 SW−HB 13.0002−EN 4.1
10.1.6 Power stage
With the menu Parameters
W Device parameters W Power stage you can determine the
behaviour of the power stage.
As clock frequency you can select 10 kHz or 20 kHz.
With a low clock frequency, there will be a singing sound when the motor is running. If
motor noises are to be reduced to a minimum, we recommend to select a clock frequency
of 20 kHz. With a high clock frequency, the motor losses will be slightly reduced (in return,
the losses in the 931E/K servo positioning controller will increase. This is why the
maximum current limits are slightly lower). The clock frequency selection has no influence
on the control behaviour. The clock frequency of the power stage is default set to 10 kHz.
931e_288
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Stop!
ƒ The settings can only be changed when the power stage is switched off. For
accepting the setting, save the parameter set and reset the controller.
ƒ When the clock frequency is changed, the setting of the maximum
permissible current must be checked. With 10 kHz, the effective maximum
current must not exceed 32 A (20 kHz: 28 A).