Mitsubishi Electric 800 Series Instruction Manual page 10

Main circuit terminals
 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.)
• When fast response current limit is enabled (Pr.156 = "0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, or 30"), the wiring length should be within the
value in the table below.
• ND/HD rated
Pr.72 setting (carrier frequency)
2 (2 kHz) or less
3 (3 kHz) or more
• LD/SLD rated
Pr.72 setting
(carrier frequency)
2 (2 kHz) or less 100 m
3 (3 kHz) or more 100 m
• When fast response current limit is disabled (Pr.156 = "1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, or 31"), the wiring length should be within the
value in the table below.
FR-A860-00027
100 m 300 m
Use a "600 V class inverter-driven insulation-enhanced motor" and set frequency in Pr.72 PWM frequency selection according to wiring length.
Wiring length 50 m or shorter
15 (14.5 kHz) or less
 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 600 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 Chapter 5 of the Instruction Manual (Detailed).)
• For details of Pr.72 PWM frequency selection, refer to Chapter 5 of the Instruction Manual (Detailed).
• Refer to Chapter 3 in the Instruction Manual (Detailed) to drive a 600 V class motor by an inverter.
• The carrier frequency is limited with a PM motor. (Refer to Chapter 5 of the Instruction Manual (Detailed).)
 Cable size for the control circuit power supply (terminals R1/L11 and S1/L21)
• Terminal screw size: M4
2
• Cable gauge: 0.75 mm to 2 mm
• Tightening torque: 1.5 N m
•
10
WIRING
FR-A860-00027
100 m
100 m
FR-A860-00027 FR-A860-00061
200 m
100 m
FR-A860-00061 FR-A860-00090
500 m
Wiring length 50 to 100 m
9 (9 kHz) or less
2
FR-A860-00061 FR-A860-00090
300 m 300 m
200 m 300 m
FR-A860-00090
300 m
200 m
FR-A860-00170
or higher
500 m
Wiring length longer than 100 m
4 (4 kHz) or less
FR-A860-00170
or higher
500 m
500 m
FR-A860-00320
FR-A860-00170
500 m 500 m
400 m 500 m
or higher