Limit The Output Frequency; Maximum/Minimum Frequency (Pr. 1, Pr. 2, Pr. 18) - Mitsubishi Electric FR-E720-600 Instruction Manual

4.5

Limit 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)

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 User group read selection = "0". (Refer to page 180)
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).
(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
Pr. 15 Jog frequency
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
Maximum/minimum
frequency
Frequency jump
Initial Value
120Hz
0Hz
120Hz
(1)
Clamped at the
Use Pr. 1 Maximum frequency to set the maximum frequency. If the
maximum frequency
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.
Frequency setting
(When Pr. 18 is set, Pr. 1 automatically switches to the frequency of
5, 10V
Pr. 18. Also, when Pr. 1 is set, Pr. 18 is automatically changed to the
(20mA)
frequency set in Pr. 1.
CAUTION
Refer to page 105
Refer to page 97

Limit the output frequency

Parameter that should be Set
Pr. 1, Pr. 2, Pr. 18
Pr. 31 to Pr. 36
Setting Range
0 to 120Hz Upper limit of the output frequency.
0 to 120Hz Lower limit of the output frequency.
Set when performing the operation at 120Hz
120 to 400Hz
or more.
Set maximum frequency
Refer to Page
89
90
Description
Refer to page 171
89
4