Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual page 34

(3) Total wiring length
Under general-purpose motor control
Connect one or more general-purpose motors within the total wiring length shown in the following table.
Pr. 72 PWM frequency selection Setting
(carrier frequency)
2 (2kHz) or lower
3 (3kHz) or higher
Total wiring length when using a general-purpose motor (2.2K 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. Take the following measures 1) or 2) in this case.
Refer to page 53 for measures against deteriorated insulation.
1) Use a "400V class inverter-driven insulation-enhanced motor" and set frequency in Pr. 72 PWM frequency selection
according to wiring length.
Pr. 72 PWM frequency selection Setting
(carrier frequency)
2) Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) to the 55K or lower and the sine wave filter
(MT-BSL/BSC) to the 75K or higher on the inverter output side.
Under IPM motor control
Connect an IPM motor within the total wiring length of 100m.
Use one dedicated IPM motor for one inverter. Multiple IPM motors cannot be connected to an inverter.
To drive a 400V-class motor with an inverter under IPM control, set Pr.72 PWM frequency selection according to the wiring
length as shown below.
Applied inverter
FR-F740P-0.75K to 1.5K
Other
CAUTION
· 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 or fast response current limit function or a malfunction or fault
of the equipment connected on the inverter output side. If fast-response current limit function malfunctions, disable this function.
(For Pr.156 Stall prevention operation selection, refer to page 91
· For details of Pr. 72 PWM frequency selection , refer to page 182
the 75K or higher, set "25" in Pr.72 (2.5kHz).
· The surge voltage suppression filter (FR-ASF-H/FR-BMF-H) option and sine wave filter (MT-BSL/BSC) cannot be used under
IPM motor control, so do not connect them.
· For explanation of surge voltage suppression filter (FR-ASF-H/FR-BMF-H) and sine wave filter (MT-BSL/BSC), refer to the
manual of each option.
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal Screw Size: M4
2
· Cable size: 0.75mm to 2mm
· Tightening torque: 1.5N·m
0.75K
300m
200m
500m or less
50m or less
14.5kHz or lower
Wiring Length
50m or less
0(2kHz) to 15(14kHz)
0(2kHz) to 15(14kHz)
(Sine wave filter can be only used with a general-purpose motor.)
2
Main circuit terminal specifications
1.5K 2.2K or Higher
500m 500m
300m 500m
300m
300m
300m + 300m = 600m
Wiring Length
50m to 100m
9kHz or lower
50m to 100m
5(2kHz) or lower
9(6kHz) or lower
.)
. (When using an optional sine wave filter (MT-BSL/BSC) for
exceeding 100m
4kHz or lower
2
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