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172 Unidrive M Regen Design Guide
Issue Number: 4
The switching frequency is changed in steps defined by Auto-switching Frequency Step Size (05.036). For example with a switching frequency of
16 kHz and a step size of two, the frequency will be reduced to 8 kHz, then 4 kHz etc. Minimum Switching Frequency (05.038) defines the minimum
switching frequency that the system will attempt to use. If the switching frequency needs to switch to a lower level, then the drive will trip. If Minimum
Switching Frequency is changed the new value will only become active when Switching Frequency is at or above the minimum value.
See Auto-switching Frequency Change (05.035).
Shows the actual inverter switching frequency after the auto-change function.
See Auto-switching Frequency Change (05.035).
Maximum Inverter Temperature Ripple (05.039) defines the maximum inverter temperature ripple allowed before the switching frequency is reduced.
See Auto-switching Frequency Change (05.035).
05.036 Auto-switching Frequency Step Size
RW Num US
1 to 2
2
05.037 Switching Frequency
RO Txt ND NC PT
3 (1) kHz, 4 (2) kHz, 6 (3) kHz,
8 (4) kHz, 12 (5) kHz, 16 (6) kHz
05.038 Minimum Switching Frequency
RW Txt US
0 to VM_MIN_SWITCHING_FREQUENCY kHz
3 (1) kHz
05.039 Maximum Inverter Temperature Ripple
RW Num US
20 to 60 °C
60 °C
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