Mitsubishi Electric FR-D720-008 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.
100V, 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 81)
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 malfunction of fast-response current limit function occurs, disable this function. If malfunction of stall prevention
function occurs, increase the stall level. (Refer to page 77 for Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention
operation selection )
Refer to page 146 for details of Pr. 72 PWM frequency selection. Refer to the manual of the option 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 134)
Motor capacity
(kW(HP))
Wiring length
008 014
200m 200m
(656.19feet) (656.19feet)
30m 100m
(98.42feet) (328.08feet)
012 022
200m 200m
(656.19feet) (656.19feet)
30m 100m
(98.42feet) (328.08feet)
Total wiring length (FR-D720-070 or more, FR-D720S-070 or more,
FR-D740-080 or more)
300m(984.25feet) + 300m(984.25feet)
= 600m(1968.50feet)
0.1K(1/8)
20m (65.61feet)
Main circuit terminal specifications
025 042 070 or More
300m 500m
(984.25feet) (1640.42feet) (1640.42feet)
200m 300m
(656.19feet) (984.25feet) (1640.42feet)
036 050
300m 500m
(984.25feet) (1640.42feet) (1640.42feet)
200m 300m
(656.19feet) (984.25feet) (1640.42feet)
500m
(1640.42feet)
or less
300m
(984.25feet)
300m
(984.25feet)
0.2K(1/4) 0.4K(1/2) or more
50m (164.04feet)
500m
500m
080
or More
500m
500m
100m (323.08feet)
2
19