Regeneration Avoidance Function - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

 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 inverter is operated by the DC power supply by setting Pr.30 = "2, 10, 11, 20, or 21" (DC deeding), Undervoltage
(E.UVT) and Instantaneous power failure (E.IPF) are 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.
WARNING
• The value set in Pr.70 must not exceed the setting of the brake resistor used.
It may cause overheating.
Parameters referred to
Pr.17 MRS input selectionpage 499
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

5.16.12 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.
696
5. PARAMETERS
5.16 (G) Control parameters
Rated input DC voltage 283 to 339 VDC
Permissible fluctuation 240 to 373 VDC
Rated input DC voltage 537 to 679 VDC
Permissible fluctuation 457 to 740 VDC
597, page 604
selection)page 496
selection)page 450
selectionpage 610