Mitsubishi Electric 800 Series Instruction Manual page 9

 Total wiring length
 With general-purpose motor
Connect one or more general-purpose motors within the total wiring length 500 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 lower
 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 motor 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).)
• Refer to Chapter 3 in the Instruction Manual (Detailed) to drive a 600 V class motor by an inverter.
 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
•
Wiring length 50 to 100 m
9 (9 kHz) or lower
2
Wiring length longer than 100 m
4 (4 kHz) or lower
Main circuit terminals
9
WIRING