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Programming Your Application
1-101
690+ Series Frequency Inverter
Functional Description
Four programmable skip frequencies are available to avoid resonances within the mechanical
system. Enter the value of frequency that causes the resonance using the “FREQUENCY
”
parameter and then programme the width of the skip band using its
“
BAND
”
parameter. The
Inverter will then avoid sustained operation within the forbidden band as shown in the diagram.
The skip frequencies are symmetrical and thus work in forward and reverse.
Note:
Setting the FREQUENCY to 0 disables the corresponding band.
Setting the BAND to 0 causes the value of BAND 1 to be used for this band.
The behaviour of this function block is illustrated below.
Setpoint
Drive
Frequency
Frequency 1
Frequency 2
Skip band
Skip Frequency
Setpoint
Drive
Frequency
Setpoint
Drive
Frequency
Frequency 1
Frequency 2