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Main circuit terminals
 Total wiring length
 With general-purpose motor
Connect one or more general-purpose motors within the total wiring length shown in the following table.
Pr.72 setting
(carrier frequency)
2 (2 kHz) or lower
300 m
3 (3 kHz) or higher
200 m
When driving a 400 V class motor by the inverter, surge voltages attributable to the wiring constants may occur at the motor terminals, deteriorating the
insulation of the motor. In this case, take one of the following measure.
• Use a "400 V class inverter-driven insulation-enhanced motor" and set Pr. 72 PWM frequency selection according to the wiring length.
Wiring length shorter than 50 m
15 (14.5 kHz) or lower
• Connect the surge voltage suppression filter (FR-ASF-H, FR-BMF-H) to the output side of the FR-F840-01160(55K) or lower and the sine wave filter (MT-
BSL, MT-BSC) to the output side of the FR-F840-01800(75K) or higher.
 With PM motor
Use the following length of wiring or shorter when connecting a PM motor.
Pr.72 setting
Voltage class
(carrier frequency)
200 V
0 (2 kHz) to 15 (14 kHz)
5 (2 kHz) or lower
400 V
6 to 9 (6 kHz)
10 (10 kHz) or higher
Use one PM motor for one inverter. Multiple PM motors cannot be connected to an inverter.
• Especially for long-distance wiring, the inverter may be affected by a charging current caused by stray capacitances of the wiring, leading to an activation of the
overcurrent protection, malfunction of the fast-response current limit operation, or even to an inverter failure. If the fast-response current limit function malfunctions,
disable this function.
(Pr.156 Stall prevention operation selection Refer to
• The optional surge voltage suppression filter (FR-ASF-H/FR-BMF-H) or sine wave filter (MT-BSL/MT-BSC) cannot be used under PM motor control. Do not connect it.
• For details of Pr.72 PWM frequency selection, refer to
• The FR-ASF-H and FR-BMF-H can be used under V/F control and Advanced magnetic flux vector control. The MT-BSL and MT-BSC can be used under V/F control.
(For details, refer to the Instruction Manual of the option.)
• Refer to
 Cable size for the control circuit power supply (terminals R1/L11 and S1/L21)
• Terminal screw size: M4
• Cable gauge: 0.75 mm
to 2 mm
• Tightening torque: 1.5 N


500 m
300 m
Wiring length 50 m to 100 m
9 (9 kHz) or lower
FR-F820-00077(1.5K) or lower,
FR-F840-00038(1.5K) or lower
100 m
100 m
50 m
50 m
Chapter 3 in the Instruction Manual (Detailed) to drive a 400 V class motor by an inverter.
FR-F820-00105(2.2K) or higher,
FR-F840-00052(2.2K) or higher
500 m
500 m
Wiring length longer than 100 m
4 (4 kHz) or lower
FR-F820-00105(2.2K) or higher,
FR-F840-00052(2.2K) or higher
100 m
100 m
100 m
50 m
Chapter 5 of the Instruction Manual (Detailed).)
Chapter 5 of the Instruction Manual (Detailed).


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