Mitsubishi Electric 700 Series Installation Manualline page 14

(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.
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 Chapter 4 of the Instruction Manual)
Refer to 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 than 100m,
select without frequency search (Pr. 162 = "1, 11"). (
008 015
200m 200m
(656.19 feet) (656.19 feet)
30m 100m
(98.42 feet) (328.08 feet)
016 026
200m 200m
(656.19 feet) (656.19 feet)
30m 100m
(98.42 feet) (328.08 feet)
Total wiring length (FR-E720-175(SC) or more, FR-E740-095(SC) or more)
300m(984.25feet) + 300m(984.25feet)
= 600m(1968.50feet)
50m(164.04feet) or
less
14.5kHz or less
Main circuit terminal specifications
030 050
300m 500m
(984.25 feet) (1640.42 feet)
200m 300m
(656.19 feet) (984.25 feet)
040 060
300m 500m
(984.25 feet) (1640.42 feet)
200m 300m
(656.19 feet) (984.25 feet)
500m
(1640.42feet)
or less
300m
(984.25feet)
300m
(984.25feet)
Wiring Length
50m(164.04feet) to
100m(328.08feet)
8kHz or less
Refer to Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention
Refer to Chapter 4 of the Instruction Manual)
080 110
500m 500m
(1640.42 feet) (1640.42 feet)
500m 500m
(1640.42 feet) (1640.42 feet)
095
or More
500m
(1640.42 feet)
500m
(1640.42 feet)
Exceeding
100m(323.08feet)
2kHz or less
175
or More
500m
(1640.42 feet)
500m
(1640.42 feet)
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