79
Limiting the rotation speed
4
PARAMETERS
4.5.2 Avoiding mechanical resonance points (speed jumps) (Pr. 31 to Pr. 36)
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 144)
∗1 Differs according to capacities. (0.2K to 2.2K/3.7K)
∗2 If a value exceeding 3000r/min is set, the actual rotation speed will be limited at 3000r/min.
When it is desired to avoid resonance attributable to the natural speed of a mechanical system, these parameters allow
resonant frequencies to be jumped.
Parameter
Number
Name Initial Value Setting Range Description
31 Speed jump 1A
9999
0 to 12000r/min/
0 to 8000r/min
∗1∗2
1A to 1B, 2A to 2B, 3A to 3B are speed
jumps
9999: Function invalid
32 Speed jump 1B
33 Speed jump 2A
34 Speed jump 2B
35 Speed jump 3A
36 Speed jump 3B
Up to three areas may be set, with the jump speeds 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 speeds.
Example 1 To fix the speed to 900r/min in the range of 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 of 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.
Pr. 31
Pr. 32
Pr. 33
Pr. 34
Pr. 35
Pr. 36
Speed jump
Set speed (r/min)
r. 34: 1050r/min
Pr. 33: 900r/min
r. 33: 1050r/min
Pr. 34: 900r/min
