Main circuit terminals
34
INSTALLATION AND WIRING
Total wiring length
With induction motor
Connect one or more general-purpose motors within the total wiring length shown in the following table.
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 measures.
• Use a "400 V class inverter-driven insulation-enhanced motor" and set Pr.72 PWM frequency selection according to
the wiring length.
• For the FR-F846-01160(55K) or lower, connect a surge voltage suppression filter (FR-ASF-H/FR-BMF-H) at the output
side of the inverter. For the FR-F846-01800(75K) or higher, connect a sine wave filter (MT-BSL/BSC) at the output side
of the inverter.
With PM motor
Use the following length of wiring or shorter when connecting a PM motor.
Use one PM motor for one inverter. Multiple PM motors cannot be connected to an inverter.
• Especially for long-distance wiring or wiring with shielded cables, the inverter may be affected by a charging current caused
by stray capacitance 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. It may also cause a malfunction or fault of the equipment connected ON
the inverter output side. Stray capacitance of the wiring differ by the installation condition, use the total wiring length in the
table above as reference values. If the fast-response current limit function malfunctions, disable this function. (Refer to Pr.156
Stall prevention operation selection on the FR-F800 Instruction Manual (Detailed).)
• A surge voltage suppression filter (FR-ASF-H/FR-BMF-H) can be used under V/F control and Advanced magnetic flux vector
control. A sine wave filter (MT-BSL/BSC) can be used under V/F control. Do not use the filters under different control
methods.
• For the details of Pr.72 PWM frequency selection, refer to the FR-F800 Instruction Manual (Detailed).
• Refer to page 78 to drive a 400 V class motor by an inverter.
Pr.72 setting
(carrier frequency)
FR-F846-00023(0.75K) FR-F846-00038(1.5K) FR-F846-00052(2.2K) or higher
2 (2 kHz) or lower 300 m 500 m 500 m
3 (3 kHz) or higher 200 m 300 m 500 m
Total wiring length (FR-F846-00052(2.2K) or higher)
Wiring length 50 m or shorter Wiring length 50 m to 100 m Wiring length longer than 100 m
15 (14.5 kHz) or lower 9 (9 kHz) or lower 4 (4 kHz) or lower
Pr.72 setting
(carrier frequency)
FR-F846-00038(1.5K) or lower FR-F846-00052(2.2K) or higher
5 (2 kHz) or lower 100 m 100 m
6 to 9 (6 kHz) 50 m 100 m
10 (10 kHz) or higher 50 m 50 m
300 m+300 m=600 m
500 m or less
300 m
300 m
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