Limit The Output Frequency; Maximum/Minimum Frequency (Pr. 1, Pr. 2, Pr. 18) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.9 Limit the output frequency

Purpose
Set upper limit and lower limit of
output frequency
Perform operation by avoiding
mechanical resonance points
4.9.1

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
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 if the set frequency is equal to or less 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.
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 170
Pr. 15 Jog frequency Refer to page 163
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
Parameter that must be Set
Maximum/minimum
frequency
Frequency jump
Initial Value
55K or less
75K or more
0Hz
55K or less
75K or more
(1) Set maximum frequency
Clamped at the
⋅ Set the upper limit of the output frequency in Pr. 1 Maximum
maximum frequency
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 setting
frequency. (When Pr. 18 is set, Pr. 1 automatically switches to the
5, 10V
frequency of Pr. 18. When Pr. 18 is set, Pr. 18 automatically
(20mA)
switches to the frequency of Pr. 1.)
CAUTION

Limit the output frequency

Pr. 1, Pr. 2, Pr. 18
Pr. 31 to Pr. 36
Setting Range
120Hz
Set the upper limit of the output
0 to 120Hz
frequency.
60Hz
Set the lower limit of the output
0 to 120Hz
frequency.
120Hz
Set when performing the
120 to 400Hz
operation at 120Hz or more.
60Hz
Refer to page 282
Refer to Page
153
154
Description
153
4