Operation Avoiding Resonance (Jump Frequency Function) - YASKAWA Varispeed G7 Series Instruction Manual

When constant H3-09 or H3-05 is set to D (frequency bias 2), the frequency equivalent to the terminal A2 or
A3 input voltage is added to A1 as a bias.


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
Name
Con-
stant
Display
Number
Jump fre-
quency 1
d3-01
Jump Freq 1
Jump fre-
quency 2
d3-02
Jump Freq 2
Jump fre-
quency 3
d3-03
Jump Freq 3
Jump fre-
quency width
d3-04
Jump Band-
width
The relationship between the frequency reference and the jump frequency reference is as follows:
Frequency reference
10%
Bias
0 V
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 following
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.
Adjusting Frequency References
H3-02
Terminal A1 input voltage
10 V
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0.0 Hz No A A
0.0 to
0.0 Hz No A A
400.0
0.0 Hz No A A
0.0 to
1.0 Hz No A A
20.0
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A A A 294H
A A A 295H
A A A 296H
A A A 297H
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