Setting The Maximum Frequency; Setting The Minimum Frequency; Limiting The Output Frequency (Maximum/Minimum Frequency) - Mitsubishi FR-A800 Instruction Manual

5.10.9
Limiting the output frequency (maximum/
minimum frequency)
Motor speed can be limited. Clamp the output frequency at the upper and lower limits.
Pr. Name
1
Maximum frequency
H400
2
Minimum frequency
H401
18
High speed maximum frequency
H402

For the FR-A820-03160(55K)or lower and FR-A840-01800(55K) or lower.

For the FR-A820-03800(75K)or higher and FR-A840-02160(75K) or higher.
Setting the maximum frequency (Pr.1, Pr.18)
• Set Pr.1 Maximum frequency to the upper limit of the output frequency. If the value of the frequency command entered is
higher than the setting, the output frequency is clamped at the maximum frequency.
• To operate at a frequency higher than the 120 Hz, adjust the upper output frequency limit with Pr.18 High speed maximum
frequency. (When setting a frequency in Pr.18, the Pr.1 setting automatically changes to the frequency set in Pr.18. Also,
when setting a frequency in Pr.1, the Pr.18 setting automatically changes to the frequency set in Pr.1.)
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2
0
(4mA)
Clamped at the
minimum frequency
Setting the minimum frequency (Pr.2)
• Set Pr.2 Minimum frequency to the lower limit of the output frequency.
• If the set frequency is Pr.2 or less, the output frequency is clamped at Pr.2 (will not fall below Pr.2).
NOTE
• To operate with a frequency higher than 60 Hz using frequency-setting analog signals, change the Pr.125 (Pr.126)
(frequency setting gain) setting. Simply changing the Pr.1 and Pr.18 settings does not enable operation at a frequency
higher than 60 Hz.
• During Real sensorless vector control, vector control, and PM sensorless vector control, the upper and lower limits are for the
commanded frequency.
• When Pr.15 Jog frequency setting is equal to or less than Pr.2 setting, the Pr.15 setting has precedence over the Pr.2
setting.
• If a jump frequency that exceeds Pr.1(Pr.18) Maximum frequency is set for the 3-point frequency jump, the maximum
frequency setting is the set frequency. If the set frequency is less than the jump frequency Pr.2 Minimum frequency, the
jump frequency is the set frequency. (The set frequency can be equal to or lower than the frequency lower limit.) 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 higher than Pr.13 Starting frequency, simply
turning ON the start signal will run the motor at the frequency set in Pr.2 even if the command
frequency is not input.
Parameters referred to ???????
Pr.13 Starting frequency page
Pr.15 Jog frequency page 327
Pr.125 Terminal 2 frequency setting gain frequency, Pr.126 Terminal 4 frequency setting gain frequency
Initial value
120 Hz

60 Hz

0 Hz
120 Hz

60 Hz

Clamped at the
maximum frequency
Frequency setting
5, 10V
(20mA)
298, page 299
(H) Protective function parameter
Setting range
0 to 120 Hz Set the upper limit of the output frequency.
0 to 120 Hz Set the lower limit of the output frequency.
0 to 590 Hz Set when operating at 120 Hz or higher.
page 415
Description
345
PARAMETERS
5
GROUP
H