Protective Functions - Mitsubishi Electric F700 Instruction Manual

(3) Total wiring length
The overall wiring length for connection of a single motor or multiple motors should be within the value in the table below.
Pr. 72 PWM frequency selection Setting
(carrier frequency)
2 (2kHz) or less
3 to 15 (3kHz to 14.5kHz) *
* For the 75K or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".
Total wiring length (1.5K or more)
When driving a 400V class motor by the inverter, surge voltages attributable to the wiring constants may occur at
the motor terminals, deteriorating the insulation of the motor.
Refer to page 51 for measures against deteriorated insulation.
CAUTION
· 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 fast-response current limit function malfunctions, disable this
function. (For Pr.156 Stall prevention operation selection, refer to page 73 .)
· For details of Pr. 72 PWM frequency selection , refer to page 142. (When using an optional sine wave filter (MT-BSL/BSC) for the
75K or more, set "25" in Pr.72 (2.5kHz)).
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal Screw Size: M4
2
· Cable size: 0.75mm to 2mm
· Tightening torque: 1.5N·m
0.75K
300m
200m
500m or less
300m
300m
300m + 300m = 600m
2
Main circuit terminal specifications
1.5K 2.2K or More
500m 500m
300m 500m
2
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