Mitsubishi Electric FR-A820-00046 Instruction Manual page 691

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.
NOTE The commercial power supply operation is not available with Mitsubishi vector control dedicated
motors (SF-V5RU).
Connection diagram
● A typical connection diagram of the electronic bypass sequence is shown below.
Fig. 5-224:
FR-A800
Standard models and IP55 compatible models
MCCB MC1
R/L1
S/L2
T/L3
R1/L11
S1/L21
Inverter start
(forward rotation)
STF
Inverter/bypass
CS
operation interlock
MRS
External thermal
0H
Reset
RES
PC
10
Frequency
2
setting signal
5
Electronic bypass sequence connection diagram (Standard/IP55 compatible models)
(A) Application parameters
MC2
External
thermal relay
MC3
U
IM
V
W
MC1
MC1
MC2
MC3
MC2
24 V DC
MC3
MC2
MC3
SE
I002668E_G
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