Mitsubishi Electric FR-F720-00046 Instruction Manual page 33

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.
Pr. 72 PWM frequency selection Setting
(carrier frequency)
2 (2kHz) or less
3 to 15 (3kHz to 14.5kHz) *
* For the FR-F720-03160 (FR-F740-01800) or more, 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.
Refer to page 52 for measures against deteriorated insulation.
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 76.)
· For details of Pr. 72 PWM frequency selection , refer to page 159. (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)).
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal Screw Size: M4
2
· Cable size: 0.75mm
· Tightening torque: 1.5N·m
24
Total wiring length (FR-F720-00077 (FR-F740-00038) or more)
300m (984.25feet) + 300m (984.25feet)
= 600m (1968.50feet)
2
to 2mm
FR-F720-00046 FR-F720-00077
FR-F740-00023 FR-F740-00038
300m 500m
(984.25 feet) (1640.42 feet)
200m 300m
(656.19 feet) (984.25 feet)
500m
(1640.42feet)
or less
300m
(984.25feet)
300m
(984.25feet)
FR-F720-00105 or more
FR-F740-00052 or More
500m
(1640.42 feet)
500m
(1640.42 feet)