Mitsubishi Electric FR-D700 Installation Manuallines page 10

(2) 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. Take the following measures (1) or (2) in this case.
(1) Use a "400V class inverter-driven insulation-enhanced motor" and set frequency in Pr. 72 PWM frequency selection
according to wiring length
Carrier frequency
(2) Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) on the inverter output side.
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. (
the chapter 4 of the Instruction Manual)
Refer to the chapter 4 of the Instrunction Manual 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"). (
Motor capacity
Wiring length
008 014
200m 200m
30m 100m
012 022
200m 200m
30m 100m
Total wiring length (FR-D720S-070 or more, FR-D740-080 or more)
50m or less 50m to 100m
14.5kHz or less
Refer to Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention operation selection in
0.1K
20m
025 042
or More
300m 500m 500m
200m 300m 500m
036 050
or More
300m 500m 500m
200m 300m 500m
500m or less
300m
300m
300m+300m=600m
Wiring Length
Exceeding 100m
8kHz or less 2kHz or less
Refer to the chapter 4 of the Instruction Manual)
0.2K
50m
WIRING
070
080
0.4K
100m
7