Avoiding Mechanical Resonance Points (Speed Jumps) (Pr. 31 To Pr. 36) - Mitsubishi Electric FR-D720-0.2K-G Instruction Manual

Limiting the rotation speed
4.6.2

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

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
31 Speed jump 1A
32 Speed jump 1B
33 Speed jump 2A
34 Speed jump 2B
35 Speed jump 3A
36 Speed jump 3B
The above parameters can be set when Pr. 160 Extended function display selection =

The value left of the slash is for the 2.2K drive unit or lower. The one right of the slash is for the 3.7K drive unit.

If a value exceeding the upper speed limit of the motor is set, the actual operation will be limited at the maximum rotation speed. The setting range is for the
S-PM motor. The maximum setting value differs depending on the number of poles of the applied motor.
Speed jump
Pr. 36
Pr. 35
Pr. 34
Pr. 33
Pr. 32
Pr. 31
Pr. 34: 1050r/min
Pr. 33: 900r/min
Pr. 33: 1050r/min
Pr. 34: 900r/min
NOTE
During acceleration/deceleration, the running speed within the set area is valid.
88
Name Initial Value
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.
Setting Range
0 to 12000r/min /
9999
0 to 8000r/min
0 . (Refer to page 161.)
" "
 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.
Description
1A to 1B, 2A to 2B, 3A to 3B are speed
jumps

9999: Function invalid