Limiting The Output Frequency (Maximum/Minimum Frequency) - Mitsubishi Electric 800 Series Instruction Manual

10.8
Limiting the output frequency (maximum/minimum
frequency)
Motor speed can be limited. Clamp the upper and lower limits of the output frequency.
Pr. Name
1
Maximum frequency
H400
2
Minimum frequency
H401
18 High speed maximum
H402 frequency
 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 given 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 a frequency is set 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 (does 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 the operation at a frequency higher than
60 Hz.
• Under Real sensorless vector control and PM sensorless vector control, the upper and lower limits are for the commanded
frequency. The final output frequency that is decided by each control may exceed the lower or upper limits.
• When Pr.15 Jog frequency is equal to or less than Pr.2, the Pr.15 setting takes precedence.
• If a jump frequency that exceeds the setting of Pr.1 (Pr.18) is set, the maximum frequency setting is the set frequency. If the
jump frequency is less than the setting of Pr.2, the jump frequency is the set frequency. (The set frequency can be equal to or
less 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 runs the motor at the frequency set in Pr.2 even if the command frequency is not given.
Parameters referred to
Pr.13 Starting frequencypage 175,
Pr.15 Jog frequencypage 200
Pr.125 Terminal 2 frequency setting gain frequency, Pr.126 Terminal 4 frequency setting gain
Initial value
120 Hz 0 to 120 Hz
0 Hz 0 to 120 Hz
120 Hz 0 to 590 Hz
Clamped at the
maximum frequency
Frequency setting
5, 10V
(20mA)
page 176
Setting range
Set the upper limit of the output frequency.
Set the lower limit of the output frequency.
Set when operating at 120 Hz or higher.
frequencypage 282

10.8 Limiting the output frequency (maximum/minimum frequency)

Description
10.(H) Protective Function Parameters
1
2
3
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5
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7
8
9
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