Mitsubishi Electric A800 Instruction Manual page 46

 Total wiring length
 With general-purpose motor
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 less under
vector control.)
Pr.72 setting FR-A820-00046(0.4K),
(carrier frequency) FR-A840-00023(0.4K)
2 (2 kHz) or lower 300 m
3 (3 kHz) or higher 200 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 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 shorter than 50 m
15 (14.5 kHz) or less
• Connect the surge voltage suppression filter (FR-ASF-H, FR-BMF-H) to the output side of the FR-A840-01800(55K) or lower and the sine wave filter (MT-
BSL, MT-BSC) to the output side of the FR-A840-02160(75K) or higher.
 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 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. If the fast-response current limit function malfunctions,
disable this function.
(Pr.156 Stall prevention operation selection Refer to
• The optional surge voltage suppression filter (FR-ASF-H/FR-BMF-H) or sine wave filter (MT-BSL/MT-BSC) cannot be used under PM sensorless vector control. Do not
connect it.
• For details of Pr.72 PWM frequency selection, refer to
• The FR-ASF-H are FR-BMF-H can be used under V/F control and Advanced magnetic flux vector control. The MT-BSL and MT-BSC can be used under V/F control.
(For details, refer to the Instruction Manual of the option.)
• Refer to Chapter 3 in the Instruction Manual (Detailed) to drive a 400 V class motor by an inverter.
• The carrier frequency is limited with a PM motor. (Refer to
 Cable size for the control circuit power supply (terminals R1/L11 and S1/L21)
• Terminal screw size: M4
2 2
• Cable gauge: 0.75 mm to 2 mm
• Tightening torque: 1.5 N m
•
FR-A820-00077(0.75K),
FR-A840-00038(0.75K)
500 m
300 m
Wiring length 50 m to 100 m
9 (9 kHz) or less
Chapter 5 of the Instruction Manual (Detailed).)
Chapter 5 of the Instruction Manual (Detailed).
Chapter 5 of the Instruction Manual (Detailed).)
FR-A820-00105(1.5K) or higher,
FR-A840-00052(1.5K) or higher
500 m
500 m
Wiring length longer than 100 m
4 (4 kHz) or less
Main circuit terminals
9
WIRING