LS SV-iG5H Series, Manual, Page: 133 / 226

Advanced functions
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8.15 Regeneration Avoidance Function
The regenerative status can be avoided by detecting the DC Link Voltage level and

raising the frequency to burn out the excessive regenerative energy.
Regenerative energy is occasionally generated due to other fan devices connected in

the same duct.
Group Code Parameter Name Setting Range Default Unit
Function
group 2
F75 RegenAvd Sel -
0: NO
1: YES
0: NO
F76 RegenAvd Level - 75.0-100.0 87.5 %
F77 ComFreq Limit - 0-10.00 1.00 Hz
F78 RegenAvd Pgain - 0-100.0 50.0
F79 RegenAvd Igain - 1.0-320.0 50.0
When RegenAvd Level is 100%, DC link voltages are 400V/800V. so when the value is

87.5% by default, the dc voltage to start regen-avoidance function are 350V/700V.
In a regenerative status, DC link voltage will rise, which may is the main cause of
overvoltage alarm. Regenerative status can be avoided by increasing the speed of the
motor when rising of DC link voltage is detected. Overspeed operation is start when the DC
link voltage level exceeds F76_RegenAvd Level.