Mitsubishi 700 Series Instruction Manual page 23

Wiring
(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. 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 malfunction of fast-response current limit function occurs, disable this function. If malfunction of stall prevention
function occurs, increase the stall level. (
operation selection in the chapter 4 of the Instruction Manual (applied))
Refer to Chapter 4 of the Instruction Manual (Applied) 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
14
0.1K 0.2K
200m 200m
30m 100m
0.4K 0.75K
200m 200m
30m 100m
Total wiring length (FR-D720-1.5K or more, FR-D720S-1.5K or more,
FR-D740-3.7K or more)
50m or less
14.5kHz or less
0.1K
20m
0.4K 0.75K
300m 500m
200m 300m
1.5K 2.2K
300m 500m
200m 300m
500m or less
300m
300m
300m+300m=600m
Wiring Length
50m to 100m Exceeding 100m
8kHz or less
Refer to Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention
Refer to Chapter 4 of the Instruction Manual (Applied))
0.2K
50m
1.5K or
More
500m
500m
3.7K
or More
500m
500m
2kHz or less
0.4K or more
100m