Avoiding Mechanical Resonance Points (Frequency Jump) (Pr. 31 To Pr. 36) - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Fr-f700p series
Hide thumbs Also See for FR-F720P-0.75K to 110K:
Table of Contents

Advertisement

(2) Set minimum frequency
⋅ Use Pr. 2 Minimum frequency to set the lower limit of the output frequency.
⋅ The output frequency is clamped by the Pr. 2 setting even the set frequency is lower than the Pr. 2 setting (The
frequency will not decrease to the Pr. 2 setting.)
REMARKS
⋅ When Pr. 15 Jog frequency is equal to or less than Pr. 2, the Pr. 15 setting has precedence over the Pr. 2 setting.
⋅ When stall prevention is activated to decrease the output frequency, the output frequency may drop to Pr. 2 or below.
⋅ Under IPM motor control, the estimated output frequency (rotations per minute) is used to limit the frequency. Therefore, the
value displayed in the monitor may reach the lower limit frequency or lower.
If the Pr. 2 setting is higher than the Pr. 13 Starting frequency value, note that the motor will run at the set
frequency according to the acceleration time setting by simply switching the start signal ON, without entry of the
command frequency.
♦ Parameters referred to ♦
Pr. 13 Starting frequency
Refer to page 113
Pr. 15 Jog frequency
Refer to page 104
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
4.5.2

Avoiding mechanical resonance points (Frequency jump) (Pr. 31 to Pr. 36)

When it is desired to avoid resonance attributable to the natural frequency of a mechanical system, these parameters
allow resonant frequencies to be jumped.
Parameter
Name
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 = "0". (Refer to page 201)
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
CAUTION
⋅ During acceleration/deceleration, the running frequency within the set area is valid.
CAUTION
Initial Value
9999
9999
9999
9999
9999
9999
⋅ Up to three areas may be set, with the jump frequencies set
⋅ The settings of frequency jumps 1A, 2A, 3A are jump points,
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.
Limiting the output frequency
Setting Range
0 to 400Hz, 9999
0 to 400Hz, 9999
1A to 1B, 2A to 2B, 3A to 3B is
0 to 400Hz, 9999
frequency jumps
0 to 400Hz, 9999
9999: Function invalid
0 to 400Hz, 9999
0 to 400Hz, 9999
to either the top or bottom point of each area.
and operation is performed at these frequencies in the jump
areas.
Refer to page 193
Description
4
97

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents