Mitsubishi Electric 700 Series, Instruction Manual

Page: 98 / 416

87
Limiting the output frequency
4
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4.4 Limiting the output frequency
4.4.1 Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)
* The parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190)
(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.)
Purpose Parameter that must be Set Refer to Page
Set upper limit and lower limit of
output frequency Maximum/minimum
frequency
Pr. 1, Pr. 2, Pr. 18 87
Perform operation by avoiding
mechanical resonance points
Frequency jump Pr. 31 to Pr. 36 88
You can limit the motor speed. Clamp the upper and lower limits of the output frequency.
Parameter
Number
Name
Initial Value
200V class (400V class)
Setting Range Description
1 Maximum frequency
02330 (01160) or less 120Hz
0 to 120Hz
Set the upper limit of the output
frequency.
03160 (01800) or more 60Hz
2 Minimum frequency 0Hz 0 to 120Hz
Set the lower limit of the output
frequency.
18 *
High speed maximum
frequency
02330 (01160) or less 120Hz
120 to 400Hz
Set when performing the
operation at 120Hz or more.
03160 (01800) or more 60Hz
(1) Set maximum frequency
⋅
Set the upper limit of the output frequency in Pr. 1 Maximum
frequency . If the value 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 .)
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
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.
CAUTION
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 Refer to page 104
Pr. 15 Jog frequency Refer to page 95
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency Refer to page 177
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2 Frequency setting
Clamped at the
maximum frequency
Clamped at the
minimum frequency
5, 10V
(20mA)
0
(4mA)