Mitsubishi Electric FR-F820-00077 Instruction Manual page 506

(A) Application parameters
Electronic bypass sequence function
● When operating the motor at 60 Hz (or 50 Hz), the motor can be more efficiently operated with a
commercial power supply. In addition, if the motor cannot be stopped for a long period of time
even for an inverter maintenance and inspection, it is recommended that a commercial power
supply circuit be installed.
● When switching between inverter operation and commercial power supply operation, commer-
cial power supply may be accidentally applied to the output side of the inverter. To avoid such
situation, provide an interlock where the magnetic contactor at the commercial power supply
side turns ON at turn OFF of the magnetic contactor at the inverter output side.
The inverter's electronic bypass sequence that outputs timing signals for the magnetic contactors
can act as a complicated interlock between the commercial power supply operation and the
inverter operation.
Connection diagram
● A typical connection diagram of the electronic bypass sequence is shown below.
Fig. 5-145:
MCCB
Fig. 5-146:
5 - 334
MCCB MC1
Inverter start
(forward rotation)
Inverter/bypass
operation interlock
External thermal
Reset
Frequency
setting signal
Electronic bypass sequence connection diagram (Standard models)
Separated converter type
Converter unit
MC1
P/+
R/L1
S/L2 N/-
T/L3
R1/L11
S1/L21
SE
RDA
External
ALM
thermal
OH
Y214
Reset
RES
RSO
PC
Electronic bypass sequence connection diagram (Separated converter type)
Standard models
MC2
External
thermal relay
MC3
R/L1 U
S/L2 V
T/L3 W
R1/L11
S1/L21
STF MC1
CS
MRS
MC3
MC2
0H
RES
MC2
PC
MC3
10
2
SE
5
P/+
N/-
Inverter start
(forward rotation)
STF
Inverter/bypass
CS
operation interlock
MRS
PC
X10
X95
X96
RES
10
Frequency
2
setting signal
5
R1/L11
S1/L21
IM
MC1
MC2
24 V DC
MC3
MC2
External
Inverter
thermal relay
MC3
U
IM
V
W
MC1
MC1
MC2
MC3
MC2
MC3
MC2
MC3
SE
Parameters
I002668E_G
24 V DC
I002848E_G