20
Main circuit terminal specifications
(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.
(The wiring length should be 100m maximum for vector control.)
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 57 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) *
00023 00038
00052 or
more
2 (2kH) or less 300m 500m 500m
3 (3kHz), 4 (4kHz) 200m 300m 500m
5 (5kHz) to 9 (9kHz) 100m
10 (10kHz) or more 50m
Total wiring length (00052 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 144 .)
· For details of Pr. 72 PWM frequency selection , refer to page 272.
500m or less
300m
300m
300m + 300m = 600m
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