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2.4.6
Connection of the power regeneration converter (MT-RC) (FR-F720-03160 (FR-
F740-01800) or more)
When connecting a power regeneration converter (MT-RC), perform wiring securely as shown below. Incorrect
connection will damage the regeneration converter and inverter. After connecting securely, set "1" in
Pr. 30 Regenerative function selection and "0" in Pr. 70 Special regenerative brake duty.
MCCB
Three-phase
AC power
supply
CAUTION
⋅ When using the FR-F700 series together with the MT-
RC, install a magnetic contactor (MC) at the input side of
the inverter so that power is supplied to the inverter after
1s or more has elapsed after powering on the MT-RC.
When power is supplied to the inverter prior to the MT-
RC, the inverter and the MT-RC may be damaged or the
MCCB may trip or be damaged.
⋅ Refer to the MT-RC manual for precautions for
connecting the power coordination reactor and others.
2.4.7
Connection of the power factor improving DC reactor (FR-HEL)
When using the DC reactor (FR-HEL), connect it between terminals P1-P/+.
For the FR-F720-02330 (FR-F740-01160) or less, the jumper connected across terminals P1-P/+ must be removed.
Otherwise, the reactor will not exhibit its performance.
For the FR-F720-03160 (FR-F740-01800) or more, a DC reactor is supplied. Always install the reactor.
CAUTION
⋅ The wiring distance should be within 5m(16.4feet).
⋅ The size of the cables used should be equal to or larger than that of the power supply cables (R/L1, S/L2, T/L3).(Refer to page 21)
MC1
MT-RCL
R
S
T
Inverter input power supply (MC2)
MT-RC power supply (MC1)
P1
P/+
Remove
the jumper.
Connection of stand-alone option units
Inverter
MC2
U
R/L1
V
S/L2
W
T/L3
R1/L11
S1/L21
DCL
P1
P1
P/+ N/
P
P
N
R2
R2
RES
STF
S2
S2
SD
T2
C
T2
B
A
R
S
RDY
T
R1
SE
S1
MT-RC
FR-HEL
I M
Reset signal
Alarm signal
Ready signal
ON
ON
1s or more
43
2
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