Limiting The Output Frequency; Maximum/Minimum Frequency (Pr. 1, Pr. 2, Pr. 18) - Mitsubishi Electric FR-D720 K Series 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)

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 Extended function display selection = "0". (Refer to page 165.)
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
Jog frequency
Pr. 15
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
86
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
value 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.
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 101.
Refer to page 94.
Parameter that should be Set
Pr. 1, Pr. 2, Pr. 18
Pr. 31 to Pr. 36, Pr. 552
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
86
87
Description
Refer to page 156.