Mitsubishi Electric FR-F740-00023-EC Instruction Manual page 22

(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 (2kH) or less
3 (3kHz), 4 (4kHz)
5 (5kHz) to 9 (9kHz)
10 (10kHz) or more
* For the 01800 or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".
Total wiring length (00038 or more)
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 40 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 60 .)
· For details of Pr. 72 PWM frequency selection , refer to page 130. When using an optional sine wave filter (MT-BSL/BSC) for the
01800 or more, set "25" in Pr.72 (2.5kHz).
Main circuit terminal specifications
00023 00038
300m 500m
200m 300m
100m
500m or less
300m
300m
300m + 300m = 600m
00052 or
More
500m
500m
50m
1
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