Mitsubishi Electric FR-F820-00046 Instruction Manual page 56

 Total wiring length
 With induction motor
Connect one or more general-purpose motors within the total wiring length shown in the following table.
Pr.72 setting FR-F820-00046(0.75K),
(carrier frequency) FR-F840-00023(0.75K)
2 (2 kHz) or lower 300 m
3 (3 kHz) or higher 200 m
Total wiring length (FR-F820-00105(2.2K) or higher, FR-F840-00052(2.2K) or higher)
500 m or less
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 50 m or shorter
15 (14.5 kHz) or lower
• For the FR-F840-01160(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-F840-01800(75K) or higher, connect a sine wave filter (MT-BSL/BSC) at the output side of
the inverter.
FR-F820-00077(1.5K),
FR-F840-00038(1.5K)
500 m
300 m
300 m+300 m=600 m
Wiring length 50 to 100 m
9 (9 kHz) or lower
FR-F820-00105(2.2K) or higher, FR-
F840-00052(2.2K) or higher
500 m
500 m
300 m
300 m
Wiring length longer than 100 m
4 (4 kHz) or lower
2. INSTALLATION AND WIRING
2.5 Main circuit terminals
1
2
3
4
5
6
7
8
9
10
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