Avoiding Mechanical Resonance Points (Frequency Jumps) (Pr. 31 To Pr. 36) - Mitsubishi Electric FR-E720-008 Instruction Manual

Limiting the output frequency
4.5.2

Avoiding mechanical resonance points (frequency jumps) (Pr. 31 to Pr. 36)

When avoiding resonance arisen from the natural frequency of a mechanical system, use these parameters to jump the
resonant frequencies.
Parameter
Number
31 Frequency jump 1A
32 Frequency jump 1B
33 Frequency jump 2A
34 Frequency jump 2B
35 Frequency jump 3A
36 Frequency jump 3B
The above parameters can be set when Pr. 160 User group read selection =
Frequency jump
Pr. 36
Pr. 35
Pr. 34
Pr. 33
Pr. 32
Pr. 31
Pr. 34: 35Hz
Pr. 33: 30Hz
Pr. 33: 35Hz
Pr. 34: 30Hz
NOTE
During acceleration/deceleration, the running frequency within the set area is valid.
96
Name Initial Value
Example 1 To fix the frequency to 30Hz in the range 30Hz to 35Hz, set 35Hz in Pr. 34 and
30Hz in Pr. 33.
Example 2 To jump the frequency to 35Hz in the range 30Hz to 35Hz, set 35Hz in Pr. 33
and 30Hz in Pr. 34.
Setting Range
9999 0 to 400Hz, 9999
9999 0 to 400Hz, 9999
9999 0 to 400Hz, 9999
9999 0 to 400Hz, 9999
9999 0 to 400Hz, 9999
9999 0 to 400Hz, 9999
0 . (Refer to page 187)
" "
Up to three areas can be set, with the jump frequencies set to
either the top or bottom point of each area.
The value set to 1A, 2A or 3A is a jump point and operation in
the jump zone is performed at these frequencies.
Description
1A to 1B, 2A to 2B, 3A to 3B is frequency
jumps
9999: Function invalid