Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 925 / 1218

Parameters (G) Control parameters
FR-A800 5 - 723
5.16.11 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.
Parameters referred to
Pr. 17 MRS input selection => page 5-443
Pr. 57 Restart coasting time => page 5-581, page 5-590
Pr. 178 to Pr. 189 (input terminal function selection) => page 5-439
Pr. 190 to Pr. 196 (output terminal function selection) => page 5-378
Pr. 261 Power failure stop selection => page 5-599
Pr. Name Initial value
Setting
range
Description
882
G120
Regeneration avoidance
operation selection
0
0 Disables regeneration avoidance function
1
Constantly enables regeneration avoidance
function
2
Enables regeneration avoidance function only
during constant-speed operation
883
G121
Regeneration avoidance
operation level
200 V
Class
380 V DC
300 to 800 V
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
voltage × .
400 V
Class
760 V DC
884
G122
Regeneration avoidance at
deceleration detection
sensitivity
0
0
Disables regeneration avoidance due to bus
voltage change rate
1 to 5
Set the sensitivity to detect the bus voltage
change rate
Setting value: 1
➔
5
Detection sensitivity: Low
➔
High
885
G123
Regeneration avoidance
compensation frequency
limit value
6 Hz
0 to 590 Hz
Set the limit value for frequency to rise when the
regeneration avoidance function operates.
9999 Disables frequency limit
886
G124
Regeneration avoidance
voltage gain
100% 0 to 200%
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.
665
G125
Regeneration avoidance
frequency gain
100% 0 to 200%
2