Operation Avoiding Resonance (Jump Frequency Function) - Omron VARISPEED F7 User Manual

Adjusting Frequency Bias Using an Analog Input
Frequency Bias, H3-05/09 = 0
When parameter H3-09 (or H3-05) is set to 0 (Frequency Bias), the frequency equivalent to the terminal A2
(or channel 3 of AI-14B) input voltage is added to A1 as a bias.
Fig 6.33 Frequency Bias Adjustment (Terminal A2 Input)
For example, if H3-02 is 100%, H3-03 is 0%, and the terminal A2 input is 1 V, the frequency reference when
0 V is input to A1 will be 10% of the maximum output frequency (E1-04).
Frequency reference
Frequency Bias 2, H3-05/09 = D
In contrary to the frequency bias function (H3-05/09 = 0), the frequency bias 2 function adds the analog bias
value to master frequency values from the analog input, from Memobus communication, from the pulse input
or from communication option boards. The bias value is not applied to multi-speed referecnes using the d2-xx
parameters.

Operation Avoiding Resonance (Jump Frequency Function)

The jump frequency function allows the prohibition or "jumping" of certain frequencies within the Inverter's
output frequency range so that the machine can operate without oscillations caused by resonant frequencies of
the machine.
It can also be used for deadband control.
During acceleration and deceleration the output frequency goes linearly through the prohibited frequency
ranges, i.e. no output frequency jumps are performed
During constant speed operation an operation within the jump frequency range is prohibited.
Related Parameters
Parameter
No.
d3-01 Jump frequency 1
Frequency bias
10 %
Bias
0 V
Fig 6.34 Frequency Bias Setting Example
Name
Multi-function analog input
terminal A2 (channel 3) input
level
H3-02
Terminal A1 input voltage
10 V
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
0.0 Hz No A A
6
Open Closed
Loop Loop
Vector Vector
A A
29
6-