Mitsubishi Electric FR-A700 Technical Manual page 300

Signal Name
DC feeding operation
X70
permission signal
Input
DC feeding cancel
X71
signal
Output Y85
DC feeding signal
Operation example 1 at power failure
ON
AC power supply
Y85(MC)
DC power supply
X70
X71
ON
STF (STR)
Output
frequency
(Hz)
Operation example 2 at power failure (when AC
power is restored)
ON
AC power supply
Y85(MC)
DC power supply
X70
OFF
X71
ON
STF (STR)
Output
frequency
(Hz)
When performing operation with DC feeding, turn ON the X70 signal.
When the inverter output is shut off because of power failure, the
inverter starts about 150ms after switching ON X70 signal. (When
automatic restart operation is valid, the inverter starts after additional
[Pr. 57] set time has elapsed.)
When the X70 signal turns OFF during inverter operation, output is
shutoff ([Pr. 261 = 0]) or the inverter is decelerated to a stop ([Pr. 261 ≠
0]).
Turn this signal ON to stop DC feeding.
When the X71 signal is turned ON during inverter operation with
turning ON the X70 signal, output is shutoff ([Pr. 261 = 0]) or the
inverter is decelerated to a stop ([Pr. 261 ≠ 0]), then the X85 signal
turns OFF after the inverter stop.
After turning ON of the X71 signal, operation can not be performed
even if the X70 signal is turned ON.
This signal turns ON during power failure or under voltage of AC
power. The signal turns OFF when the X71 signal turns ON or power
is restored.
The Y85 signal does not turn OFF during inverter operation even if the
power is restored and turns OFF after an inverter stop.
When the Y85 signal turns ON because of undervoltage, the Y85
signal does not turn OFF even if undervoltage is eliminated.
ON/OFF status is retained at an inverter reset.
ON
ON
ON
ON
Motor
coasting
Time
About 150ms
Back up operation
Power restoration
Turns OFF after stop
while running
ON
ON
ON
Motor
coasting
Time
About 150ms
Back up operation
Description
Operation example 3 at power failure (when
continuous operation is performed)
ON
AC power supply
Y85(MC)
DC power supply
ON
X70
OFF
X71
ON
STF (STR)
Output
frequency
(Hz)
(12) Power supply specification at DC feeding
A700
As voltage between P and N becomes 415VDC
(830VDC) or more temporarily at regeneration, select
DC power supply carefully.
200V Rated input DC voltage 283 VDC to 339 VDC
class Permissible fluctuation
400V Rated input DC voltage 537VDC to 679 VDC
Permissible fluctuation
class
334
PARAMETER
Parameter Setting
Set 70 in any of [Pr.
178 to 189].
Set 71 in any of [Pr.
178 to 189].
Set 85 (positive logic)
or 185 (negative logic)
in any of [Pr. 190 to
196] .
Power restoration
Remains ON while running
ON
Time
Back up operation
240VDC to 373VDC
457VDC to 740VDC