Total Wiring Length With Induction Motor; Total Wiring Length With Pm Motor - Mitsubishi Electric FR-F800 Instruction Manual

Main circuit terminals
Total wiring length
 With induction motor
Connect one or more induction 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)
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.
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.
 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.
NOTE
• Especially for long-distance wiring or wiring with shielded cables, 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. It may also cause a malfunction or fault of the equipment connected ON
the inverter output side. Stray capacitances 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
• 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
• For the details of the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) and the sine wave filter (MT-BSL/BSC), refer to
the Instruction Manual of each option.
• Refer to page 82
44
INSTALLATION AND WIRING
FR-F820-00077(1.5K)
FR-F840-00038(1.5K)
500 m
300 m
500 m or less
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
page
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
300 m
300 m
300 m+300 m=600 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
248.)
page 179.