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4.4
Limit the output frequency
Purpose
Set upper limit and lower limit of
Maximum/minimum
output frequency
frequency
Perform operation by avoiding
Frequency jump
mechanical resonance points
4.4.1
Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)
Motor speed can be limited.
Clamp the upper and lower limits of the output frequency.
Parameter
Name
Number
1
Maximum frequency
2
Minimum frequency
High speed maximum
18 ∗
frequency
* The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
Clamped at the
maximum frequency
Output frequency
(Hz)
Pr. 1
Pr. 18
Pr. 2
Frequency setting
0
5, 10V
(4mA)
(20mA)
Clamped at the
minimum frequency
REMARKS
When performing operation above 60Hz using the frequency setting analog signal, change Pr. 125 (Pr. 126) (frequency setting
gain).
(2)
Set minimum frequency
Use Pr. 2 Minimum frequency to set the minimum frequency.
If the set frequency is less than Pr. 2, the output frequency is clamped at Pr. 2 (will not fall below Pr. 2 ).
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.
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 98
Pr. 15
Jog frequency
Refer to page 91
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
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Limit the output frequency
Parameter that should be Set
Pr. 1, Pr. 2, Pr. 18
Pr. 31 to Pr. 36
Initial Value
Setting Range
120Hz
0 to 120Hz
Upper limit of the output frequency.
0Hz
0 to 120Hz
Lower limit of the output frequency.
Set when performing the operation at 120Hz
120Hz
120 to 400Hz
or more.
(1)
Set maximum frequency
Use Pr. 1 Maximum frequency to set the maximum frequency. If the
frequency of the frequency command entered is higher than the
setting, the output frequency is clamped at the maximum frequency.
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. Also, when Pr. 1 is set, Pr. 18 is automatically changed to the
frequency set in Pr. 1.
CAUTION
Refer to Page
83
84
Description
4
Refer to page 153
83
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