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WIRING
23
Main circuit terminal specifications
(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.
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.
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.
zUnder 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.
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal Screw Size: M4
· Cable size: 0.75mm
2
to 2mm
2
· Tightening torque: 1.5N·m
Pr. 72 PWM frequency selection Setting
(carrier frequency)
0.75K 1.5K 2.2K or Higher
2 (2kHz) or lower 300m 500m 500m
3 (3kHz) or higher 200m 300m 500m
Total wiring length when using a general-purpose motor (2.2K or higher)
Applied inverter
Wiring Length
50m or less 50m to 100m
FR-F740P-0.75K to 1.5K 0(2kHz) to 15(14kHz) 5(2kHz) or lower
Other 0(2kHz) to 15(14kHz) 9(6kHz) or lower
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 . (When using an optional sine wave filter (MT-BSL/BSC) for
the 75K or higher, set "25" in Pr.72 (2.5kHz).
(Sine wave filter can be only used with a general-purpose motor.)
· 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.
500m or less
300m
300m
300m + 300m = 600m
Wiring Length
50m or less 50m to 100m exceeding 100m
Pr. 72 PWM frequency selection Setting
(carrier frequency)
14.5kHz or lower 9kHz or lower 4kHz or lower