Mitsubishi Electronics FR-E720-0.1KSC to 15KSC ユーザーズマニュアル

(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.

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.

2) Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) on the inverter output side.

Pr. 72 PWM frequency selection

Setting

(carrier frequency)

0.1K

0.2K

0.4K

0.75K

1.5K

2.2K

3.7K

or More

1 (1kHz) or less

200V class

200m

300m

500m

400V class

200m

300m

500m

2 to15

(2kHz to 14.5kHz)

200V class

30m

100m

200m

300m

500m

400V class

30m

100m

200m

300m

500m

Wiring Length

50m or less

50m to 100m

Exceeding 100m

Carrier frequency

14.5kHz or less

8kHz or less

2kHz or less

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. (

Pr. 22 Stall prevention operation level and Pr. 156 Stall prevention operation

selection in Chapter 4 of the Instruction Manual (Applied))



When using the automatic restart after instantaneous power failure function with the wiring length exceeding 100m,

select without frequency search (Pr. 162 = "1, 11"). (

Refer to Chapter 4 of the Instruction Manual (Applied))