Mitsubishi Electric FR-E720-600 Instruction Manual page 30

(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.
200V class
Pr. 72 PWM frequency
selection Setting
(carrier frequency)
1 (1kHz) or less
2 to15
(2kHz to 14.5kHz)
400V class
Pr. 72 PWM frequency
selection Setting
(carrier frequency)
1 (1kHz) or less
2 to15
(2kHz to 14.5kHz)
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 89)
NOTE
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, fast response current limit
function, or stall prevention function or a malfunction or fault of the equipment connected on the inverter output side.
If fast-response current limit malfunctions, disable this function. When the stall prevention function misoperates,
increase the stall level. (Refer to page 85 for Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention operation selection )
Refer to page 166 for details of Pr. 72 PWM frequency selection. Refer to the manual of the opition for details of surge voltage
suppression filter (FR-ASF-H/FR-BMF-H).
When using the automatic restart after instantaneous power failure function with wiring length exceeding below,
select without frequency search (Pr. 162 = "1, 11"). ( Refer to page 154)
Motor capacity
(kW(HP))
Wiring length
008 015
200m 200m
(656.19feet) (656.19feet) (984.25feet)
30m 100m
(98.42feet) (328.08feet) (656.19feet)
016 026
200m 200m
(656.19feet) (656.19feet) (984.25feet)
30m 100m
(98.42feet) (328.08feet) (656.19feet)
Total wiring length (FR-E720-175 or more, FR-E740-095 or more)
300m
(984.25feet)
300m(984.25feet) + 300m(984.25feet)
= 600m(1968.50feet)
0.1K(1/8)
20m (65.61feet)
Main circuit terminal specifications
030 050
300m 500m 500m
(1640.42feet) (1640.42feet)
200m 300m 500m
(984.25feet) (1640.42feet)
040 060
or More
300m 500m
(1640.42feet) (1640.42feet)
200m 300m
(984.25feet) (1640.42feet)
500m
(1640.42feet)
or less
300m
(984.25feet)
0.2K(1/4) 0.4K(1/2) or more
50m (164.04feet) 100m (323.08feet)
175
080 110
or More
500m 500m
(1640.42feet) (1640.42feet)
500m 500m
(1640.42feet) (1640.42feet)
095
500m
500m
2
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