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⋅ When the motor is operated at 60Hz, more efficient operation can be performed by the commercial power supply
than by the inverter. When the motor cannot be stopped for a long time for the maintenance/inspection of the
inverter, it is recommended to provide the commercial power supply circuit.
⋅ To avoid commercial power supply being applied to the inverter output side when switching between inverter
operation and commercial power supply operation, provide an interlock which the MC of the commercial power
supply side turns ON only when the MC of the inverter output side is OFF. Using the electronic bypass sequence
function that outputs the timing signal for operation of the magnetic contactor, a complicated commercial power
supply switchover interlock can be provided by the inverter.
(1) Connection diagram
⋅ The following shows the connection diagram of a typical electronic bypass sequence. Sink logic, Pr. 185 = "7", Pr.
192 = "17", Pr. 193 = "18", Pr. 194 = "19"
MC1
MCCB
R/L1
S/L2
T/L3
R1/L11
S1/L21
Inverter start
(forward rotation)
STF
Inverter/bypass
CS
operation interlock
MRS
*3
External
JOG(OH)
thermal reset
RES
SD
10
Frequency
2
setting signal
5
Electronic bypass sequence connection diagram
CAUTION
⋅ Use the bypass operation function in External operation mode. Be sure to connect the other power supply since the function is
not performed normally unless the connection terminals R1/L11, S1/L21 are not connected to the other power supply (power
supply that does not pass MC1).
⋅ Be sure to provide mechanical interlocks for MC2 and MC3.
⋅ Operations of magnetic contactors (MC1, MC2, MC3)
Magnetic
Contactor
Between power supply and
MC1
inverter input
Between power supply and
MC2
motor
Between inverter output and
MC3
motor
MC2
External
thermal relay
MC3
U
IM
V
W
MC1
*1
(MC1)IPF
MC2
MC3
*1
(MC2)OL
MC3
MC2
*1
(MC3)FU
SE
Installation Place
Bypass operation
Special operation and frequency control
*1
Take caution for the capacity of the sequence output terminal.
The used terminal changes depending on the setting of Pr. 190 to
Pr. 196 (output terminal function selection).
Output Terminal Capacity
Inverter open collector output
(RUN, SU, IPF, OL, FU)
Inverter relay output (A1 and C1,
B1 and C1, A2 and B2, B2 and C2)
Relay output option (FR-A7AR)
*2
*2
When connecting a DC power supply, insert a protective diode.
24VDC
When connecting an AC power supply, connect a relay output
option (FR-A7AR) and use a contact output.
*3
The used terminal changes depending on the setting of Pr. 180 to
Pr. 189 (input terminal function selection).
Operation ( : Shorted, ×: Open)
During inverter
operation
×
Output Terminal
Permissible Load
24VDC 0.1A
230VAC 0.3A
30VDC 0.3A
At an inverter fault
occurrence
×
(Shorted by reset)
×
(Can be selected using
×
Pr. 138, always open
when external thermal
relay is ON)
×
4
295
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