Limiting The Output Frequency; Maximum/Minimum Frequency (Pr. 1, Pr. 2, Pr. 18) - Mitsubishi Electric FR-F720-0.75K to 110K Instruction Manual

Limiting the output frequency

4.4 Limiting the output frequency

Purpose
Set upper limit and lower limit of
output frequency
Perform operation by avoiding
mechanical resonance points
4.4.1

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 *
frequency
* The parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 175)
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2
0
(4mA)
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). If only Pr. 1 or Pr. 18 is changed, operation above 60Hz cannot be performed
(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 the set frequency is lower than the Pr. 2 setting (The
frequency will not decrease to the Pr. 2 setting.)
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.
If the Pr. 2 setting is higher than the Pr. 13 Starting frequency value, note that the motor will run at the set
frequency according to the acceleration time setting by merely switching the start signal on, without entry of the
command frequency.
♦ Parameters referred to ♦
Pr. 13 Starting frequency
Pr. 15 Jog frequency Refer to page 90
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
82
Maximum/minimum
frequency
Frequency jump
Initial Value
55K or less
75K or more
55K or less
75K or more
Clamped at the
maximum frequency
Frequency setting
5, 10V
(20mA)
Refer to page 98
Parameter that must be Set
Pr. 1, Pr. 2, Pr. 18
Pr. 31 to Pr. 36
Setting Range
120Hz
0 to 120Hz
60Hz
0Hz 0 to 120Hz
120Hz
120 to 400Hz
60Hz
(1) Set maximum frequency
⋅ Set the upper limit of the output frequency in Pr. 1 Maximum
frequency. If the frequency 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.)
CAUTION
Refer to Page
82
83
Description
Set the upper limit of the output
frequency.
Set the lower limit of the output
frequency.
Set when performing the
operation at 120Hz or more.
Refer to page 167