Mitsubishi Electric FR-F800 Series Instruction Manual page 406

• 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
• Note that a PM motor cannot be driven by the commercial power supply.
 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
MC1
MCCB
*1 Be careful of the capacity of the sequence output terminals.
The applied terminals differ by the settings of Pr.190 to Pr.196 (Output terminal function selection).
Open collector output of inverter (RUN, SU, IPF, OL, FU)
Inverter relay output (A1-C1, B1-C1, A2-B2, B2-C2)
Relay output option (FR-A8AR)
*2 When connecting a DC power supply, insert a protective diode.
When connecting an AC power supply, use the relay output option (FR-A8AR), and use contact outputs.
*3 The applied terminals differ by the settings of Pr.180 to Pr.189 (Input terminal function selection)
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MC1
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

External ALM
OH

thermal
Y214
RES
Reset
RSO
SD
Output terminal capacity
search engine
MC2
External
thermal relay
MC3
M
MC1

MC2
MC3


24VDC
MC3
MC2

Inverter start
(forward rotation)
Inverter/bypass
operation interlock
Frequency
setting signal
Separated converter type
24 VDC 0.1 A
230 VAC 0.3 A
30 VDC 0.3 A
MC2
Inverter
MC3
P/+
U
V
N/-
W
STF
CS

MRS

SD
MC1
X10
 MC3

X95
MC2

X96
RES
MC2

10
MC3
2
5
SE
R1/L11
S1/L21
Output terminal permissible load
5.11 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
External
thermal relay
M
MC1
MC2

24VDC
MC3
405
5. PARAMETERS