Mitsubishi Electric 800 Series Instruction Manual page 613

(G) Control parameters
• Following is the connection diagram of switching to DC power supply using the power failure detection of the inverter.
MCCB
Three-phase AC
power supply
DC power
(+)
(-)
Forward rotation start
Reverse rotation start
DC feeding permission signal
DC feeding cancel signal
Contact input common
3
Frequency command
Frequency setting
potentiometer
1
1/2 W 1 kΩ

Assign the function by setting Pr.178 to Pr.189 (Input terminal function selection).

Assign the function by setting Pr.190 to Pr.196 (Output terminal function selection).
• Operation example at the time of power failure occurrence 1
• Operation example at the time of power failure occurrence 2 (when the AC power supply is restored)
Control power supply
612
PARAMETERS
Inverter
MC
R/L1
S/L2
T/L3
R1/L11
S1/L21
MC1
P/+
N/-
STF
STR
∗1
X70
∗1
X71
SD
10
2
2
5
AC power supply
Control power
supply
ON
AC power supply
Y85(MC)
X70
X71
ON
STF(STR)
Output
frequency
(Hz)
AC
ON
AC power supply
Y85(MC)
X70
OFF
X71
ON
STF(STR)
Output
frequency
(Hz)
Inrush
U
current
limit circuit
V
W
Earth
(Ground)
DC feeding signal
MC1
∗2
Y85
SE
DC power supply
ON
ON
ON
Motor
coasting
Approx.
200 ms
Back up operation
DC
ON
ON
ON
Motor
coasting
Approx.200 ms
Back up operation
IM
24 VDC
ON
Time
AC
Power restoration
Turns off after stop
while running
Time