Mitsubishi Electric FR-D720-0.1K Instruction Manual page 28

(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)
Total wiring length when using a general-purpose motor (FR-D720-1.5K or higher, FR-D720S-1.5K
or higher, FR-D740-3.7K or higher)
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. If that is the case, use a "400V class inverter-driven insulationenhanced
motor" and set a frequency in Pr. 72 PWM frequency selection according to the total wiring length shown in the following table.
(Refer to page 84 to drive a 400V class motor with an inverter.)
Pr. 72 PWM frequency selection
(Carrier frequency)
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 80 for Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention
operation selection )
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 137)
Motor capacity
Wiring length
Parameters referred to
Pr. 72 PWM frequency selection
0.1K 0.2K
200m 200m
30m 100m
0.4K 0.75K
200m 200m
30m 100m
500m or less
50m or less
15 (14.5kHz) or less
0.1kW 0.2kW
20m
Refer to page 149
Main circuit terminal specifications
0.4K 0.75K
300m 500m
200m 300m
1.5K 2.2K
300m 500m
200m 300m
300m
300m
300m+300m=600m
Wiring Length
50m to 100m
8 (8kHz) or less
0.4kW or higher
50m 100m
1.5K or
higher
500m
500m
3.7K or
higher
500m
500m
Exceeding 100m
2 (2kHz) or less
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