Mitsubishi Electronics FR-F700-NA

Limiting the output frequency

PARAMETERS

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 M inimum 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 a nalog 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 frequenc

Clamped at the

minimum frequency

5, 10V

(20mA)

(4mA)