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Main circuit terminals
INSTALLATION AND WIRING
31
2
Total wiring length
With induction motor
Connect one or more general-purpose motors within the total wiring length 500 m. (The wiring length should be 100 m or
less under vector control.)
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.
• If the motor capacity is 280 kW or lower, connect the sine wave filter (MT-BSL/BSC) to the output side.
With PM motor
Use the wiring length of 100 m or shorter when connecting a PM motor.
Use one PM motor for one inverter. Multiple PM motors cannot be connected to an inverter.
When the wiring length exceeds 50 m for a 400 V class motor driven by an inverter under PM sensorless vector control,
set "9" (6 kHz) or less in Pr.72 PWM frequency selection.
NOTE
• 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 the fast-response current limit function malfunctions, disable
this function. (For the details of Pr.156 Stall prevention operation selection, refer to the FR-A800 Instruction Manual
(Detailed))
• 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-A800 Instruction Manual (Detailed).
• Refer to page 72 to drive a 400 V class motor by an inverter.
• The carrier frequency is limited during PM sensorless vector control. (Refer to the FR-A800 Instruction Manual (Detailed))
Total wiring length
Wiring length 100 m or shorter Wiring length longer than 100 m
6 (6 kHz) or lower 4 (4 kHz) or lower
500 m or less
300 m
300 m
300 m+300 m=600 m