Mitsubishi Electric FR-A820-00046 Instruction Manual page 700

(A) Application parameters
● 24 V external power supply input
MCCB
24 V DC
Standard models and IP55 compatible models
Fig. 5-231:
Operation of the self power management function
● This function controls the magnetic contactor (MC) on the input side using the output relay to
reduce the standby power during inverter stop. With the terminals R1/L11 and S1/L21 (refer to
page 2-57) and 24 V external power supply input (refer to page 2-60), the main circuit power
supply and control circuit power supply are separated, and the MC for main circuit power supply
is controlled by the electronic bypass MC1 signal.
● Set Pr. 248 "Self power management selection" = "1 or 2", Pr. 30 "Regenerative function selection"
≠ "20, 21, 120, or 121" (other than DC feeding mode 2), and Pr. 190 to Pr. 196 (output terminal
function selection) = "17 (positive logic)" to assign the Electronic bypass MC1 (MC1) signal to an
output terminal.
● After the inverter is stopped and the time set in Pr. 11 "DC injection brake operation time" and
Pr. 254 "Main circuit power OFF waiting time" have passed, turning OFF the MC1 signal releases
the MC on the input side (main circuit power supply OFF). Set Pr. 254 to prevent frequent MC
operation.
● Turning ON the start signal turns ON the MC1 signal and closes the MC on the input side (main
circuit power supply ON). After the time set in Pr. 137 "Start waiting time" has passed, the inverter
starts. Set time slightly longer (about 0.3 to 0.5 s) than the time period from the MC1-ON to the
actual pick-up operation of the MC is turned ON in Pr. 137.
Fig. 5-232:
● When the protective function of the inverter is activated, the MC1 signal is immediately turned
OFF according to the Pr. 248 setting. (The MC1 signal is turned OFF before the time set in Pr. 254
has passed.)
5 - 498
Inverter
MC1
R/L1 U
S/L2 V
T/L3 W
R1/L11
S1/L21
MC1
MC1
+24
SD
SE
Power input via external 24 V power supply
Output frequency
[Hz]
STF
MC1
Power supply mode
Main circuit power supply
Timing diagram of the self power management function
Converter unit
MCCB MC1
R/L1
M S/L2
T/L3
R1/L11
S1/L21
+24
24 V DC
24 V DC
SD
DC brake
Pr. 11 Pr. 264
OFF
ON
ON OFF
R1S1 input/
RST input
external 24 V input
ON OFF
Inverter
P/+ P/+ U
N/- N/- V
W
RDA X10
RSO RES
Y17 X94
MC1
SE PC
+24
SE
SD
Separated converter type
Time
Pr. 137
ON
ON
RST input
ON
Parameters
M
MC1
24 V DC
I002837E_G
I002835E