Limiting The Output Frequency; Maximum/Minimum Frequency (Pr. 1, Pr. 2, Pr. 18) - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Fr-f700p series
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Limiting the output frequency

4.5 Limiting the output frequency

Purpose
Set upper limit and lower limit of
output frequency
Perform operation by avoiding
mechanical resonance points
4.5.1

Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)

You can limit the motor speed. Clamp the upper and lower limits of the output frequency.
Parameter
Name
Number
1
Maximum frequency
2
Minimum frequency
High speed maximum
18
*1
frequency
*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.
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2
Clamped at the
0
(4mA)
minimum frequency
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.
96
Parameter that must be Set
Maximum/minimum
frequency
Frequency jump
Initial Value
55K or lower
75K or higher
0Hz
55K or lower
75K or higher
(1) Set maximum frequency
⋅ Set the upper limit of the output frequency in Pr. 1 Maximum
Clamped at the
maximum frequency
⋅ To operate with a frequency higher than 120Hz under V/F
Frequency setting
5, 10V
(20mA)
Pr. 1, Pr. 2, Pr. 18
Pr. 31 to Pr. 36
Setting Range
120Hz
*2
0 to 120Hz
60Hz
*2
0 to 120Hz
120Hz
*2
120 to 400Hz
60Hz
*2
frequency. If the value of the frequency command entered is
higher than the setting, the output frequency is clamped at
the maximum frequency.
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.)
Refer to Page
96
97
Description
Set the upper limit of the output
frequency.
Set the lower limit of the output
frequency.
Set when performing the
*3
operation at 120Hz or higher.

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