Mitsubishi Electric FR-A800 Series Instruction Manual page 565

 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, commercial 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.
NOTE
• The commercial power supply operation is not available with Mitsubishi Electric Vector control dedicated motors (SF-V5RU).
 Connection diagram
• A typical connection diagram of the electronic bypass sequence is shown below.
MCCB
Inverter start
(forward rotation)
Inverter/bypass
operation interlock
External thermal
Reset
Frequency
setting signal
Standard models and IP55 compatible models
MCCB MC1
External
thermal
Reset
564
5. PARAMETERS
5.14 (A) Application parameters
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MC2
MC1
MC3
R/L1 U
S/L2 V
T/L3 W
R1/L11
S1/L21

STF MC1
CS
MRS


MC2
OH
RES

SD
MC3
10
2
SE
5
Converter unit
R/L1 P/+
S/L2 N/-
T/L3
R1/L11
S1/L21
SE
RDA

ALM
OH

Y214
RES
RSO
SD
search engine
External
thermal relay
M
MC1
MC2
MC3

24VDC
MC3
MC2
P/+
N/-
Inverter start
(forward rotation)
STF
Inverter/bypass
CS
operation interlock MRS
SD
X10
X95
X96
RES
10
Frequency
2
setting signal
5
R1/L11
S1/L21
Separated converter type
MC2
External
Inverter
thermal relay
MC3
U
V
W

MC1

MC1
MC2

MC3

MC2

MC3
MC2

MC3
SE
M

24VDC