Emerson unidrive m200 - Maximum Switching Frequency; High Stability Space Vector Modulation

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The steady state parameters are converted to equivalent transient model parameters:

= R

= L

+ L

= L

+ L

σL

= L

- (L

/ L

)

The equivalent drive parameters are:

StatorResistance (05.017) = R

TransientInductance (05.024) = σLs

StatorInductance (05.025) = L

Parameter 05.018 Maximum Switching Frequency

Short description Defines the maximum switching frequency that can be used by the drive

Mode Open‑loop

Minimum 0 Maximum VM_MAX_SWITCHING_FREQUENCY

Default 3 Units kHz

Type 8 Bit User Save Update Rate Background read

Display Format Standard Decimal Places 0

Coding RW, TE, VM, RA

Value Text Description

0 0.667 667Hz switching frequency

1 1 1kHz switching frequency

2 2 2kHz switching frequency

3 3 3kHz switching frequency

4 4 4kHz switching frequency

5 6 6kHz switching frequency

6 8 8kHz switching frequency

7 12 12kHz switching frequency

8 16 16kHz switching frequency

MaximumSwitchingFrequency (05.018) should be set to the required PWM switching frequency. The drive inverter will operate at this frequency unless Auto-

switchingFrequencyChangeDisable (05.035) = 0 and the inverter temperature exceeds the threshold for automatic switching frequency reduction (see

InverterTemperature (07.034)). The actual switching frequency is shown in SwitchingFrequency (05.037). The switching frequency has a direct effect on the

sample rate for the current controllers (see CurrentControllerKpGain (04.013)). All other control tasks are at a fixed rate of 1ms.

As default Auto-switchingFrequencyChangeDisable (05.035) = 0 and the system described above is always active. If Auto-

switchingFrequencyChangeDisable (05.035) = 1 then the automatic switching frequency changing system is disabled.

We recommend that a minimum ratio of 12:1 for the switching frequency compared to the maximum output frequency is used.

Parameter 05.019 High Stability Space Vector Modulation

Short description Set to 1 to enable High Stability Space Vector Modulation

Mode Open‑loop

Minimum 0 Maximum 1

Default 0 Units

Type 1 Bit User Save Update Rate Background read

Display Format Standard Decimal Places 0

Coding RW