10
(3) Total wiring length
The overall wiring length for connection of a single motor or multiple motors should be
within the value in the table below.
When driving a 400V class motor by the inverter, surge voltages attributable to the wiring constants may occur at
the motor terminals, deteriorating the insulation of the motor. Take the following measures in this case.
Take the following measures (1) or (2) in this case.
(1) Use a "400V class inverter-driven insulation-enhanced motor" and set frequency in
Pr. 72 PWM frequency
selection
according to wiring length.
(2) Connect the surge voltage suppression filter (FR-ASF-H) to the FR-F720-02330 (FR-F740-01160) or less and the
sine wave filter (MT-BSL/BSC) to the FR-F720-03160 (FR-F740-01800) or more on the inverter output side.
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal screw size: M4
· Cable size: 0.75mm
2
to 2mm
2
· Tightening torque: 1.5N·m
3.2 Control circuit terminals
(1) Terminal layout
(2) Instructions for wiring of the control circuit terminal
1)
Terminals 5, PC and SE are common to the I/O signals and isolated from each other. Do not ground.
2)
It is recommended to use the cables of 0.75mm
2
gauge for connection to the control circuit terminals.
If the cable gauge used is 1.25mm
2
or more, the front cover may be lifted when there are many cables running
or the cables are run improperly, resulting in an operation panel contact fault.
3)
The wiring length should be 30m (98.43feet) maximum.
4)
Use two or more parallel micro-signal contacts or twin contacts to
prevent a contact faults when using contact inputs since the
control circuit input signals are micro-currents.
5)
Use shielded or twisted cables for connection to the control circuit terminals and run them away from the main
and power circuits (including the 200V relay sequence circuit).
6)
Do not apply a voltage to the contact input terminals (e.g. STF) of the control circuit.
7)
Always apply a voltage to the fault output terminals (A, B, C) via a relay coil, lamp, etc.
Pr. 72 PWM frequency selection
setting
(carrier frequency)
FR-F720-00046
FR-F740-00023
FR-F720-00077
FR-F740-00038
FR-F720-00105 or more
FR-F740-00052 or more
2 (2kHz) or less
300m
(984.25feet)
500m
(1640.42feet)
500m (1640.42feet)
3 to 15 (3kHz to 14.5kHz)
200m
(656.19feet)
300m
(984.25feet)
500m (1640.42feet)
Wiring Length
50m (164.04feet) or
less
50m (164.04feet)
to
100m(328.08feet)
exceeding 100m
(328.08feet)
Pr. 72 PWM frequency selection
setting
(carrier frequency)
14.5kHz or less
9kHz or less
4kHz or less
CAUTION
· Especially for long-distance wiring, the inverter may be affected by a charging current caused by the stray capacitances of the wiring,
leading to a malfunction of the overcurrent protective function or fast response current limit function or a malfunction or fault of the
equipment connected on the inverter output side. If fast-response current limit function malfunctions, disable this function. (For
Pr.156
Stall prevention operation selection, refer to the Instruction Manual (applied).
)
· For details of
Pr. 72 PWM frequency selection ,refer to the Instruction Manual (applied)
.
When using an optional sine wave filter (MT-BSL/
BSC) for the FR-F720-03160 (FR-F740-01800) or more, set “25” in
Pr.72
(2.5kHz).
For explanation of surge voltage suppression filter (FR-ASF-H) and sine wave filter (MT-BSL/BSC), refer to the manual of each option.
· Terminal Screw Size: M3.5
· Tightening torque: 1.2N·m
A1
B1
C1
A2
B2
C2 10E
10
2
5
4
1
AM
SD
RES
MRS
STOP
AU
RT
RH
RM
RL
PC
CS
JOG
STR
STF
SD
SD
FU
OL
IPF
SU
RUN
SE
CA
Micro signal contacts
Twin contacts
