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Limiting the output frequency
4
PARAMETERS
4.9 Limiting the output frequency
4.9.1 Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)
(2) Set minimum frequency
⋅ Use Pr. 2 Minimum frequency to set the lower limit of the output frequency.
⋅ The output frequency is clamped by the Pr. 2 setting even if the set frequency is equal to or less than the Pr. 2 setting
(The frequency will not decrease to the Pr. 2 setting.)
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. 18 157
Perform operation by avoiding
mechanical resonance points
Frequency jump Pr. 31 to Pr. 36 158
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
0 to 120Hz
Set the upper limit of the output
frequency.
75K or higher 60Hz
2 Minimum frequency 0Hz 0 to 120Hz
Set the lower limit of the output
frequency.
18
High speed maximum
frequency
55K or lower 120Hz
120 to 400Hz
Set when performing the
operation at 120Hz or more.
75K or higher 60Hz
(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.
⋅ When you want to perform operation above 120Hz, set the upper
limit of the output frequency to 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
⋅ When performing operation above 60Hz using the frequency setting analog signal, change Pr. 125 (Pr. 126) (frequency setting
gain). If only Pr. 1 or Pr. 18 is changed, operation above 60Hz cannot be performed.
REMARKS
⋅ When Pr. 15 Jog frequency is equal to or less than Pr. 2, the Pr. 15 setting has precedence over the Pr. 2 setting.
⋅ When stall prevention is activated to decrease the output frequency, the output frequency may drop to Pr. 2 or below.
CAUTION
Note that when Pr. 2 is set to any value equal to or more than Pr. 13 Starting frequency, simply turning ON the
start signal will run the motor at the preset frequency according to the set acceleration time even if the
command frequency is not input.
♦ Parameters referred to ♦
Pr. 13 Starting frequency Refer to page 175
Pr. 15 Jog frequency Refer to page 167
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency Refer to page 294
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2
Frequency setting
Clamped at the
maximum frequenc
y
Clamped at the
minimum frequency
5, 10V
(20mA)
0
(4mA)