Tighten the terminal screw to the specified torque. 1 A screw that has been tightened too tightly can cause a short circuit or malfunction due to the unit breakage. A screw that has been tightened too loosely can cause a short circuit or malfunction. Use crimp terminals with insulation sleeves to wire the power supply and motor. 2 Total wiring length With induction motor 3 Connect one or more general-purpose motors within the total wiring length shown in the following table.
(The wiring length should be 100 m or shorter under Vector control.) 4 5 Total wiring length (FR-A820-00105(1.5K) or higher, FR-A840-00052(1.5K) or higher) 6 300 m 7 500 m or less 300 m + 300 m = 600 m 300 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 measures. 8 Use a "400 V class inverter-driven insulation-enhanced motor" and set Pr.72 PWM frequency selection according to the wiring length.
9 10 For the FR-A840-01800(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-A840-02160(75K) or higher, connect a sine wave filter (MT-BSL/BSC) at the output side of the inverter. 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 .
Especially for long-distance wiring, 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. If the fast-response current limit function malfunctions, disable the function. (Refer to Pr.156 Stall prevention operation selection on page 448 .) A surge voltage suppression filter (FR-ASF-H/FR-BMF-H) can be used under V/F control and Advanced magnetic flux vector control.
For details on Pr.72 PWM frequency selection , refer to page 362 . A sine wave filter (MT-BSL/BSC) can be used under V/F control. Do not use the filters under different control methods. Refer to page 132 to drive a 400 V class motor by an inverter. The carrier frequency is limited during PM sensorless vector control. (Refer to page 362 .) 67 2.
INSTALLATION AND WIRING 2.5 Main circuit terminals NO TE Pr.72 setting (carrier frequency) FR-A820-00046(0.4K) FR- FR-A840-00023(0.4K) FR- A820-00077(0.75K) A840-00038(0.75K) FR-A820-00105(1.5K) or higher FR-A840-00052(1.5K) or higher 2 (2 kHz) or lower 300 m 500 m 500 m 3 (3 kHz) or higher 200 m 300 m 500 m Wiring length 50 m or shorter Wiring length 50 to 100 Wiring length longer m than 100 m 15 (14.5 kHz) or lower 9 (9 kHz) or lower 4 (4 kHz) or lower NO TE