23
Main circuit terminal specifications
2
WIRING
(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.
* For the 75K or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".
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.
(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)
· Terminal Screw Size: M4
· Cable size: 0.75mm
2
to 2mm
2
· Tightening torque: 1.5N·m
Pr. 72 PWM frequency selection Setting
(carrier frequency)
0.75K 1.5K 2.2K or More
2 (2kHz) or less 300m 500m 500m
3 to 15 (3kHz to 14.5kHz) * 200m 300m 500m
Total wiring length (1.5K or more)
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)).
500m or less
300m
300m
300m + 300m = 600m
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