Mitsubishi Electronics FR-D740-012 ユーザーズマニュアル
83
Limit the output frequency
4.4 Limit the output frequency
4.4.1
Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)
* The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
(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 ).
If the set frequency is less than Pr. 2, the output frequency is clamped at Pr. 2 (will not fall below Pr. 2 ).
Purpose
Parameter that should be Set
Refer to Page
Set upper limit and lower limit of
output frequency
output frequency
Maximum/minimum
frequency
frequency
Pr. 1, Pr. 2, Pr. 18
Perform operation by avoiding
mechanical resonance points
mechanical resonance points
Frequency jump
Pr. 31 to Pr. 36
Motor speed can be limited.
Clamp the upper and lower limits of the output frequency.
Clamp the upper and lower limits of the output frequency.
Parameter
Number
Name
Initial Value
Setting Range
Description
1
Maximum frequency
120Hz
0 to 120Hz
Upper limit of the output frequency.
2
Minimum frequency
0Hz
0 to 120Hz
Lower limit of the output frequency.
18
∗
High speed maximum
frequency
frequency
120Hz
120 to 400Hz
Set when performing the operation at 120Hz
or more.
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.
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.
REMARKS
When performing operation above 60Hz using the frequency setting analog signal, change Pr. 125 (Pr. 126) (frequency setting
gain).
gain).
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.
When stall prevention is activated to decrease the output frequency, the output frequency may drop to Pr. 2 or below.
CAUTION
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.
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
Output frequency
(Hz)
Pr. 1
Pr. 18
Pr. 18
Pr. 2
Frequency setting
Clamped at the
maximum frequency
maximum frequency
Clamped at the
minimum frequency
minimum frequency
5, 10V
(20mA)
0
(4mA)