Operation Avoiding Resonance (Jump Frequency Function) - YASKAWA CIMR-F7A Instruction Manual

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
Con-
stant
Number
Jump fre-
d3-01
quency 1
Jump fre-
d3-02
quency 2
Jump fre-
d3-03
quency 3
Jump fre-
d3-04
quency width
* 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:
-38
6
Name Description
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.
Sets the jump frequency band-
width in Hz.
The jump frequency will be the
jump frequency ± d3-04.
Output frequency
Frequency reference descending
Jump
frequency
width d3-04
Jump
frequency
3 (d3-03)
Fig 6.31 Jump Frequency
Change
Setting Factory during
Range Setting Opera-
tion
0.0 Hz No
0.0 to
*1
400.0
0.0 Hz No
0.0 to
*2
300.0
0.0 Hz No
0.0 to
1.0 Hz No
20.0
Jump frequency width d3-04
Frequency
reference
ascending
Jump
frequency
width d3-04
Jump Jump
frequency frequency
2 (d3-02) 1 (d3-01)
Control Methods
MEMO
Open
BUS
V/f Flux
Loop
Regis-
V/f with Vec-
Vec-
PG tor
tor
A A A A 294H
A A A A 295H
A A A A 296H
A A A A 297H
Jump frequency reference
ter