Mitsubishi Electric FR-F700 Series Instruction Manual page 20

(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)
3 to 15
Total wiring length
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.
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-F740-01800 or more on the inverter output side.
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 tothe Instruction Manual (applied).)
· For details of Pr. 72 PWM frequency selection , refer to the Instruction Manual (applied).
For explanation of surge voltage suppression filter (FR-ASF-H) and sine wave filter (MT-BSL/BSC), refer to the manual of
each option.
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal Screw Size: M4
2
· Cable size: 0.75mm to 2mm
· Tightening torque: 1.5N·m
FR-F720-00046
FR-F740-00023
2
(FR-F720-00077 (FR-F740-00038) or more)
500m
(1640.42feet)
300m
(984.25feet)
300m (984.25feet) + 300m (984.25feet)
= 600m (1968.50feet)
2
FR-F720-00077
FR-F740-00038
300m 500m
(984.25 feet) (1640.42 feet)
200m 300m
(656.19 feet) (984.25 feet)
or less
300m
(984.25feet)
Wiring
FR-F720-00105 or more
FR-F740-00052 or more
500m
(1640.42 feet)
500m
(1640.42 feet)
15
2