Mitsubishi Electric 800 Series Instruction Manual page 557

• Following is the connection diagram of switching to DC power supply using the power failure detection of the inverter.
Three-phase AC
power supply
DC power
(+)
(-)
Forward rotation start
Reverse rotation start
DC feeding permission signal
DC feeding cancel signal
Contact input common
Frequency command
Frequency setting
potentiometer
1/2 W 1 k:
*1 Assign the function by setting Pr.178 to Pr.189 (Input terminal function selection).
*2 Assign the function by setting Pr.190 to Pr.196 (Output terminal function selection).
• Operation example at the time of power failure occurrence 1
556
5. PARAMETERS
5.13 (G) Control parameters
Inverter
MCCB MC
R/L1
S/L2
T/L3
R1/L11
S1/L21
MC1
P/+
N/-
STF
STR

X70

X71
SD
10
3
2
2
5
1
AC power supply
Control power
supply
ON
AC power supply
Y85(MC)
X70
X71
ON
STF(STR)
Output
frequency
(Hz)
Inrush
U
current
limit circuit
V
W
Earth
(Ground)
DC feeding signal
MC1

Y85
SE
DC power supply
ON
ON
ON
Motor
coasting
Approx.
200 ms
Back up operation
M
24 VDC
ON
Time