Regeneration Avoidance Function - Mitsubishi Electric FR-F820-00046 Instruction Manual

 Power supply specification for DC feeding (standard models and IP55
compatible models)
Rated input DC voltage
200 V class
Permissible fluctuation
Rated input DC voltage
400 V class
Permissible fluctuation
NOTE
• The voltage between terminals P and N briefly increases to 415 V (830 V) or higher during the regenerative driving, so take
caution on the selection of the DC power supply.
• When an AC power supply is connected to terminals R/L1, S/L2, and T/L3 during DC feeding with Pr.30 = "2, 10, or 11" (DC
feeding), an option fault (E.OPT) will occur.
• When the input voltage is insufficient during inverter operation with Pr.30 = "2, 10, 11, 20, or 21" (DC deeding), the inverter
output will be shut off. (The undervoltage protection function (E.UVT) is not activated.)
• When the inverter is operated with Pr.30 = "2, 10, 11, 20, or 21" (DC deeding), detection of Instantaneous power failure (E.IPF)
is not performed.
• When the DC power is switched ON, an inrush current higher than that for the AC power flows in the inverter. Minimize the
number of power-ON events.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) or Pr.190 to Pr.196 (Output
terminal function selection) may affect the other functions. Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.17 MRS input selectionpage 357
Pr.57 Restart coasting timepage
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Pr.261 Power failure stop selectionpage 458

5.13.12 Regeneration avoidance function

The regenerative status can be detected and avoided by raising the frequency.
• The operation frequency is automatically increased to prevent the regenerative operations. This function is useful when a
load is forcibly rotated by another fan in the duct.
Pr. Name
Regeneration
882
avoidance operation
G120
selection
Regeneration
883
avoidance operation
G121
level
Regeneration
884 avoidance at
G122 deceleration detection
sensitivity
Regeneration
885 avoidance
G123 compensation
frequency limit value
886 Regeneration
G124 avoidance voltage gain
Regeneration
665
avoidance frequency
G125
gain
283 to 339 VDC
240 to 373 VDC
537 VDC to 707 VDC
457 VDC to 777 VDC
446, page 451
selection)page 355
selection)page 312
Setting
Initial value
range
0
1
0
2
200 V
380 VDC
class
300 to 1200 V
400 V
760 VDC
class
0
0
1 to 5
0 to 590 Hz
6 Hz
9999
100% 0 to 200%
100% 0 to 200%
Description
The regeneration avoidance function is disabled.
The regeneration avoidance function is always enabled.
The regeneration avoidance function is enabled 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 the (power supply voltage ×
√ ) value.
2
The regeneration avoidance is disabled due to bus voltage
change rate.
Set the sensitivity to detect the bus voltage change rate.
Setting value 1 (detection sensitivity: low) to 5 (detection
sensitivity: high)
Set the limit value for frequency to rise when the regeneration
avoidance function is activated.
The frequency limit is disabled.
Adjust the response during the regeneration avoidance
operation. Increasing the setting improves the response to
change in the bus voltage. However, the output frequency may
become unstable. If setting a smaller value in Pr.886 does not
suppress the vibration, set a smaller value in Pr.665.
545
5. PARAMETERS
5.13 (G) Control parameters
1
2
3
4
5
6
7
8
9
10