Mitsubishi Electric FR-F740-00023 Instruction Manual page 113

Motor brake and stop operation
(5) DC feeding mode 2 (Pr. 30 = "20, 21")
When "20 or 21" is set in Pr. 30, operation is performed with AC power supply normally and with DC power supply
such as battery at power failure.
Connect the AC power supply to terminal R/L1, S/L2, and T/L3 and connect the DC power supply to terminal P/+
and N/-. Also, remove jumpers across terminal R/L1 and R1/L11 as well as S/L2 and S1/L21, and connect
terminals R1/L11 and S1/L21 to terminal P/+ and N/-.
Turning ON the DC feeding operation permission signal (X70) enables DC power supply operation. Refer to the
table below for I/O signals.
Signal Name
DC feeding operation
X70
permission signal
Input
X71 DC feeding cancel signal
Output Y85 DC feeding signal
The following shows the connection diagram when switching to DC power supply using inverter power failure
detection.
Three-phase AC
power supply
DC feeding permission signal
Frequency command
Frequency setting
*1 Assign the function using Pr. 178 to Pr. 189 (input terminal function selection).
*2 Assign the function using Pr. 190 to Pr. 196 (output terminal function selection).
104
When performing operation with DC feeding, turn ON
the X70 signal.
When the inverter output is shut off because of power
failure, the inverter can be started in about 150ms
after switching OFF the X70 signal then ON again.
(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
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
the inverter stop.
After turning ON the X71 signal, operation cannot 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.
MCCB MC
DC power
MC
(+)
(-)
Forward rotation start
Reverse rotation start
DC feeding cancel signal
Contact input common
3
2
potentiometer
1
1/2W1kΩ
Description
0).
0), then the X85 signal turns OFF after
Inverter
Inrush
R/L1 current U
limit circuit
S/L2 V
T/L3 W
R1/L11
S1/L21
P/+
N/-
STF
STR
*1
X70
*1
X71
*2
Y85
PC
10
SE
2
5
Parameter Setting
Set 70 in any of Pr. 178 to Pr. 189.
Set 71 in any of Pr. 178 to Pr. 189.
Set "85 (positive logic) or 185
(negative logic)" in any of Pr. 190
to Pr. 196
IM
Earth
(Ground)
DC feeding signal
MC
24VDC