Regeneration Avoidance Function - Mitsubishi Electric FR-F820-04750 Instruction Manual

(G) Control parameters
5.13.11

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.
Pr.
882
G120
883
G121
884
G122
885
G123
886
G124
665
G125
5 - 540
Name
Regeneration avoidance
operation selection
200 V
Class
Regeneration avoidance
operation level
400 V
Class
Regeneration avoidance at
deceleration detection
sensitivity
Regeneration avoidance
compensation frequency
limit value
Regeneration avoidance
voltage gain
Regeneration avoidance
frequency gain
Setting
Initial value
range
0
1
0
2
380 V DC
300 to 800 V
760 V DC
0
0
1 to 5
0 to 590 Hz
6 Hz
9999
100% 0 to 200%
100% 0 to 200%
Description
Disables regeneration avoidance function
Constantly enables regeneration avoidance
function
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
2
voltage × .
Disables regeneration avoidance due to bus
voltage change rate
Set the sensitivity to detect the bus voltage
change rate
Setting value: 1
Detection sensitivity: Low
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.
Parameters
➔
5
➔
High