Mitsubishi Electric FR-F800 Series Instruction Manual page 290

5.7.11 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.
Pr.
31
Frequency jump 1A
H420
32
Frequency jump 1B
H421
33
Frequency jump 2A
H422
34
Frequency jump 2B
H423
35
Frequency jump 3A
H424
36
Frequency jump 3B
H425
552
Frequency jump range
H429
 3-point frequency jump (Pr.31 to Pr.36)
• Up to three areas may be set, with the jump frequencies set to either the top or bottom point of each area.
• The settings of frequency jumps 1A, 2A, 3A are jump points, and operation is performed at these frequencies in the jump
areas.
Pr.36
Pr.35
Pr.33
Pr.34
Pr.32
Pr.31
Example 1) To fix the frequency to 30 Hz in the range of 30 Hz to 35 Hz, set 35 Hz in Pr.34 and 30 Hz in Pr.33.
Pr.34: 35 Hz
Pr.33: 30 Hz
Example 2) To jump the frequency to 35 Hz in the range of 30 Hz to 35 Hz, set 35 Hz in Pr.33 and 30 Hz in Pr.34.
Pr.33: 35 Hz
Pr.34: 30 Hz
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jump)
Name Initial value
9999
9999
Frequency jump
Input set frequency (Hz)
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Setting range
0 to 590 Hz, 1A to 1B, 2A to 2B, 3A to 3B are frequency jumps (3-point jump)
9999 9999: Function disabled
0 to 30 Hz Set the jump range for the frequency jumps (6-point jump).
9999 3-point jump
Description
5. PARAMETERS
5.7 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
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