(G) Control parameters
Regeneration avoidance function
The regenerative status can be avoided by detecting the regenerative status and raising the frequency.
● Continuous operation is possible by increasing the frequency automatically so it will not go into
regenerative operation even when the fan is turned forcefully by other fans in the same duct.
5 - 560
Regeneration avoidance at
380 V DC
300 to 800 V
760 V DC
1 to 5
0 to 590 Hz
0 to 200%
0 to 200%
Disables regeneration avoidance function
Constantly enables regeneration avoidance
Enables regeneration avoidance function only
during constant-speed operation
Set the bus voltage level to operate the
regeneration avoidance operation. When the bus
voltage level is set low, it will be harder to
generate overvoltage error, but actual
deceleration time will be longer.
Set the setting value higher than power supply
Disables regeneration avoidance due to bus
voltage change rate
Set the sensitivity to detect the bus voltage
Set the limit value for frequency to rise when the
regeneration avoidance function operates.
Disables frequency limit
Adjust the response at the time of regeneration
avoidance operation. When the setting value is
set larger, response against the bus voltage
change will improve, but the output frequency
may become unstable.
When the vibration cannot be stabilized even if
the setting value of Pr. 886 is made smaller, set
the setting value of Pr. 665 smaller.