24
Main circuit terminal specifications
(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.
* For the FR-F720-03160 (FR-F740-01800) or higher, the setting range of
Pr. 72 PWM frequency selection
is "0 to 6".
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 1) or 2) in this case.
(Refer to page 52)
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/FR-BMF-H) to the FR-F720-02330 (FR-F740-01160) or
lower and the sine wave filter (MT-BSL/BSC) to the FR-F720-03160 (FR-F740-01800) or higher 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
Pr. 72 PWM frequency selection
Setting
(carrier frequency)
FR-F720-00046
FR-F740-00023
FR-F720-00077
FR-F740-00038
FR-F720-00105 or higher
FR-F740-00052 or higher
2 (2kHz) or less
300m
(984.25 feet)
500m
(1640.42 feet)
500m
(1640.42 feet)
3 to 15 (3kHz to 14.5kHz) *
200m
(656.19 feet)
300m
(984.25 feet)
500m
(1640.42 feet)
Total wiring length (FR-F720-00105 (FR-F740-00052) or higher)
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 page 81.
)
· For details of
Pr. 72 PWM frequency selection , refer to page 171
. (When using an optional sine wave filter (MT-BSL/BSC) for the
FR-F720-03160 (FR-F740-01800) or higher, set "25" in
Pr.72
(2.5kHz)).
· For explanation of surge voltage suppression filter (FR-ASF-H/FR-BMF-H) and sine wave filter (MT-BSL/BSC), refer to the
manual of each option.
500m
(1640.42feet)
or less
300m
(984.25feet)
300m
(984.25feet)
300m (984.25feet) + 300m (984.25feet)
= 600m (1968.50feet)
Summary of Contents for -NAFR-F720-00167-NA
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