6
-38
Operation Avoiding Resonance (Jump Frequency Function)
The jump frequency function operates the motor while avoiding resonance caused by characteristic frequen-
cies in the machinery.
This function is effective in creating a frequency reference dead band.
During constant-speed operation, operation within the jump frequency range is prohibited. Smooth operation
still used during acceleration and deceleration, i.e., jumps are not performed.
Related Constants
* 1. When C6-01=0, the upper limit is 150.0.
* 2. When C6-01=1, the upper limit is 400.0.
The relationship between the output frequency and the jump frequency reference is as follows:
Fig 6.31 Jump Frequency
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
d3-01
Jump fre-
quency 1
Set the center values of the jump
frequencies in Hz.
This function is disabled by set-
ting the jump frequency to 0 Hz.
Always ensure that the follow-
ing applies:
d3-01
≥
d3-02
≥
d3-03
Operation in the jump frequency
range is prohibited but during
acceleration and deceleration,
speed changes smoothly without
jump.
0.0 to
400.0
*1
0.0 Hz
No
A
A
A
A
294H
d3-02
Jump fre-
quency 2
0.0 Hz
No
A
A
A
A
295H
0.0 to
300.0
*2
d3-03
Jump fre-
quency 3
0.0 Hz
No
A
A
A
A
296H
d3-04
Jump fre-
quency width
Sets the jump frequency band-
width in Hz.
The jump frequency will be the
jump frequency ± d3-04.
0.0 to
20.0
1.0 Hz
No
A
A
A
A
297H
Output frequency
Jump frequency reference
Jump
frequency
width d3-04
Jump
frequency
3 (d3-03)
Jump
frequency
2 (d3-02)
Jump
frequency
1 (d3-01)
Frequency reference descending
Frequency
reference
ascending
Jump
frequency
width d3-04
Jump frequency width d3-04
