# Avoiding The Mechanical Resonance Points (frequency Jump) - Mitsubishi Electric FR-A820-00046 Instruction Manual

(H) Protective function parameter
5.10.10

## Avoiding the mechanical resonance points (frequency jump)

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
H420
32
H421
33
H422
34
H423
35
H424
36
H425
552
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
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
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
5 - 312
Name
Frequency jump 1A
Frequency jump 1B
Frequency jump 2A
Frequency jump 2B
Frequency jump 3A
Frequency jump 3B
Frequency jump range
Frequency jump
Input set frequency (Hz)
Initial
Setting
Description
value
range
1A to 1B, 2A to 2B, 3A to 3B are frequency jumps.
0 to 590 Hz,
9999
(3-point jump)
9999
9999: Function disabled
Set the jump range for the frequency jumps (6-point
0 to3 (0 Hz)
jump).
9999
9999
3-point jump
Fig. 5-137:
Definition of the jump areas
Parameters
I002591E