Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-10-13
10-40
Frequency to Switch from PM Sensorless Mode to I/F Mode
(Frequency to Switch from IMFOCPG Mode to IMVF Mode when Pr.11-00
bit11 = 1 in IMFOCPG Mode)
Default: 20.00 / 40.00
Settings 0.00–599.00 Hz / 30.00–599.00 Hz
Set the frequency for switching from high frequency to low frequency, and sets the switch point for
high and low frequencies of the speed observer.
If the switch frequency is too low, the motor does not generate enough back-EMF to let the speed
observer measure the right position and speed of the rotor when running at the switch frequency.
The active range of I/F is too wide if the switch frequency is too high, this generates a larger current
and cannot save energy. (If the current value for Pr.10-31 is too high, the high switch frequency
makes the drive continue to output with Pr.10-31 setting value.)
When Pr.11-00 bit11 = 1, Pr.10-40 is the frequency for switching from IMFOCPG to IMVF control
modes.
When Pr.11-00 bit11 = 1, the default value for Pr.10-40 = Pr.10-39 + 20 Hz.
When Pr.11-00 bit11 = 1, Pr.10-40 cannot be lower than [Pr.10-39 + 10 Hz].
For example, if Pr.10-39 = 400 Hz, the minimum setting value allowed for Pr.10-40 is 410 Hz.
Make sure that you have set Pr.10-39 before setting Pr.10-40 and Pr.10-40 must be larger than
Pr.10-39. For applications that require shorter acceleration and deceleration time, it is
recommended to set Pr.10-40 15 Hz to be larger than Pr.10-39.
Pr.10-40 automatically changes with Pr.10-39 setting value, that is, Pr.10-40 = [Pr.10-39 + 20 Hz].
For example, if Pr.10-39 = 300 Hz, and Pr.10-40 = 310 Hz, then
Pr.10-40 automatically changes to 420 Hz when Pr.10-39 changes to 400 Hz;
Pr.10-40 automatically changes to 320 Hz when Pr.10-39 changes to 300 Hz.
When using Pr.10-39 and Pr.10-40 as the frequency for switching between IMFOCPG and IMVF
control modes, set Pr.10-39 and Pr.10-40 within the PG card bandwidth range (300 kHz).
For example, if the encoder = 5000 ppr, the PG01L (ABZ) bandwidth = 300 kHz, and the induction
motor with two-pole pairs runs in high-speed, then the setting value for Pr.10-40 is lower than 120
Hz [= (300 k / 5000 ppr) × two-pole pairs].
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