Mitsubishi Electric 800 Series Instruction Manual page 614

• Operation example at the time of power failure occurrence 3 (when continuing the operation)
Control power
AC power supply
Power supply specification for DC feeding (Standard models)
Rated input DC voltage 742 VDC to 848 VDC
Permissible fluctuation 667 VDC to 933 VDC
NOTE
• The voltage between P and N will temporarily increase to 1057 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 the R/L1, S/L2, and T/L3 terminals during the DC feeding with Pr.30 = "10, 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 set to Pr.30 = "10, 11, 20, 21" (DC feeding) and operated by DC feeding, detection of instantaneous power failure
(E.IPF) is not performed.
• When DC power is switched on, a larger inrush current flows than in AC power. The number of power-on times should be
minimized.
• 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 418
Pr.57 Restart coasting time page 515
Pr.178 to Pr.189 (Input terminal function selection)
Pr.190 to Pr.196 (Output terminal function selection)
Pr.261 Power failure stop selection
AC
supply
ON
Y85(MC)
ON
X70
OFF
X71
ON
STF(STR)
Output
frequency
(Hz)
page 415
page 370
page 526
DC
AC
Power restoration
ON Remains on while running
Time
Back up operation
(G) Control parameters
613
PARAMETERS
5
GROUP
G