Avoiding Machine Resonance Points (Frequency Jump) - Mitsubishi Electric FR-A800 Series Instruction Manual

Pr.
1
Maximum frequency
H400
2
Minimum frequency
H401
18 High speed maximum
H402 frequency
*1 For the FR-A820-03160(55K) or lower, and FR-A840-01800(55K) or lower.
*2 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 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 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
(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.
• During Real sensorless vector control, 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 Pr.1 (Pr.18) is set for the 3-point frequency jump, 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 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 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
Pr.15 Jog frequencypage 410
Pr.125 Terminal 2 frequency setting gain frequency, Pr.126 Terminal 4 frequency setting gain
5.10.10 Avoiding machine resonance points (frequency
When it is desired to avoid resonance attributable to the natural frequency of a mechanical system, these parameters allow
resonant frequencies to be jumped.
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Name Initial value
120 Hz
60 Hz
0 Hz
120 Hz
60 Hz
Clamped at the
maximum frequency
Frequency setting
0 5, 10V
(20mA)
381, page 382
jump)
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Setting range
*1
0 to 120 Hz
*2
0 to 120 Hz
*1
0 to 590 Hz
*2
Description
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 505
5.10 (H) Protective function parameter
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2
3
4
5
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7
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9
10
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5. PARAMETERS