Mitsubishi Electric FR-F800 Series Instruction Manual page 573

 Power supply specification for DC feeding (standard models and IP55
compatible models)
200 V class
400 V class
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 feeding), 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 feeding), 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 375
Pr.57 Restart coasting
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Pr.261 Power failure stop
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.
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
572
5. PARAMETERS
5.13 (G) Control parameters
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Rated input DC voltage 283 to 339 VDC
Permissible fluctuation 240 to 373 VDC
Rated input DC voltage 537 VDC to 707 VDC
Permissible fluctuation 457 VDC to 777 VDC
timepage 466, page 472
selection)page 373
selection)page 330
selectionpage 478
Name Initial value
0
200 V
380 VDC
class
400 V
760 VDC
class
0
6 Hz
100%
100%
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Setting
range
0 The regeneration avoidance function is disabled.
1 The regeneration avoidance function is always enabled.
The regeneration avoidance function is enabled only during
2
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
300 to 1200 V
be longer.
Set the setting value higher than the (power supply voltage ×
√ ) value.
2
The regeneration avoidance is disabled due to bus voltage
0
change rate.
Set the sensitivity to detect the bus voltage change rate.
1 to 5 Setting value 1 (detection sensitivity: low) to 5 (detection
sensitivity: high)
Set the limit value for frequency to rise when the regeneration
0 to 590 Hz
avoidance function is activated.
9999 The frequency limit is disabled.
Adjust the response during the regeneration avoidance
0% to 200%
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
0% to 200%
suppress the vibration, set a smaller value in Pr.665.
Description