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Limiting the output frequency
4.5 Limiting the output frequency
4.5.1 Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)
*1 The parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
*2 Performing IPM parameter initialization changes the settings. (Refer to page 80)
*3 Even if a value higher than the maximum motor frequency (Refer to page 81) is set in Pr. 18 under IPM motor control, the high speed maximum
frequency is limited to the maximum motor frequency.
Purpose Parameter that must be Set Refer to Page
Set upper limit and lower limit of
output frequency
Maximum/minimum
frequency
Pr. 1, Pr. 2, Pr. 18 96
Perform operation by avoiding
mechanical resonance points
Frequency jump Pr. 31 to Pr. 36 97
You can limit the motor speed. Clamp the upper and lower limits of the output frequency.
Parameter
Number
Name Initial Value Setting Range Description
1 Maximum frequency
55K or lower 120Hz
*2
0 to 120Hz
Set the upper limit of the output
frequency.
75K or higher 60Hz
*2
2 Minimum frequency 0Hz 0 to 120Hz
Set the lower limit of the output
frequency.
18
*1
High speed maximum
frequency
55K or lower 120Hz
*2
120 to 400Hz *3
Set when performing the
operation at 120Hz or higher.
75K or higher 60Hz
*2
(1) Set maximum frequency
⋅ Set the upper limit of the output frequency in Pr. 1 Maximum
frequency. If the value of the frequency command entered is
higher than the setting, the output frequency is clamped at
the maximum frequency.
⋅ To operate with a frequency higher than 120Hz under V/F
control or Simple magnetic flux vector control, set the
upper limit for the output frequency in Pr. 18 High speed
maximum frequency. (When Pr. 18 is set, Pr. 1 automatically
switches to the frequency of Pr. 18. When Pr. 18 is set, Pr.
18 automatically switches to the frequency of Pr. 1.)
REMARKS
⋅ To operate with a frequency higher than 60Hz (rated IPM motor frequency under IPM motor control (Refer to page 81)) using
frequency-setting analog signals, change the Pr.125 (Pr.126) (frequency setting gain) setting. Changing only Pr.1 and Pr.18 does
not allow the operation with a frequency higher than 60Hz (rated IPM motor frequency under IPM motor control (Refer to page
81)
⋅ Under IPM motor control, the estimated output frequency (rotations per minute) is used to limit the frequency. Therefore, a
value equal to or higher than the upper limit frequency may be displayed in the monitor.
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2
Frequency setting
Clamped at the
maximum frequency
Clamped at the
minimum frequency
5, 10V
(20mA)
0
(4mA)