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Limiting the rotation speed
4.7.2 Avoiding mechanical resonance points (Speed jump) (Pr.31 to Pr.36)
The above parameters can be set when Pr.160 Extended function display selection ="0". (Refer to page 182)
When a value exceeding 3000 r/min is set, the rotation speed will be limited at 3000 r/min.
Also, when an S-PM geared motor is used, the maximum setting value differs depending on the drive unit capacity. (0.2 to 2.2K: 12000 r/min, 3.7K: 8000 r/
min)
When it is desired to avoid resonance attributable to the natural speed of a mechanical system, these parameters allow
resonant speeds to be jumped.
Parameter
number
Name Initial value Setting range Description
31 Speed jump 1A
9999
0 to 4800r/min,
9999
1A to 1B, 2A to 2B, 3A to 3B is speed
jumps
9999: Function invalid
32 Speed jump 1B
9999
0 to 4800r/min,
9999
33 Speed jump 2A
9999
0 to 4800r/min,
9999
34 Speed jump 2B
9999
0 to 4800r/min,
9999
35 Speed jump 3A
9999
0 to 4800r/min,
9999
36 Speed jump 3B
9999
0 to 4800r/min,
9999
Up to three areas may be set, with the jump speeds set to
either the top or bottom point of each area.
The settings of speed jumps 1A, 2A, 3A are jump points, and
operation is performed at these speeds in the jump areas.
Example 1 To fix the speed to 900r/min in the range 900r/min to 1050r/min, set 1050r/min in
Pr.34 and 900r/min in Pr.33.
Example 2 To jump the speed to 1050r/min in the range 900r/min to 1050r/min,
set 1050r/min in Pr.33 and 900r/min in Pr.34.
NOTE
During acceleration/deceleration, the running speed within the set area is valid.
Under position control, speed jump is disabled.
Pr.31
Pr.32
Pr.33
Pr.34
Pr.35
Pr.36
Speed jump
Set speed (r/min)
P
r.34:1050r/min
P
r.33:900r/min
P
r.33:1050r/min
P
r.34:900r/min