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Connection diagram, PLG cable, PU
connector
(3) Cables and wiring length
Select the recommended cable size to ensure that a voltage drop will be 2% max.
If the wiring distance between the inverter and motor is long, the motor torque will decrease due to the voltage drop of the
main circuit cable especially at high-frequency output. The PLG signal will also be affected by the voltage drop.
The following table indicates a selection example for the wiring length of 20m.
200V class (When input power supply is 220V)
400V class (When input power supply is 440V)
The line voltage drop can be calculated by the following expression:
Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the voltage drop
(torque reduction) in the low speed range.
(4) Wiring length
!
The wiring length should be 100m maximum. (during vector control)
(5) Cable gause for the control circuit power
• Cable gause: 0.75mm
2
to 2mm
2
• Tightening torque: 1.5N•m
Applicable Inverter
Type
Terminal
Screw Size
Tightening
Torque
N·m
HIV Cables
mm
2
R, S, T
U, V, W
FR-V520-1.5K, 2.2K M4 1.5 2 2
FR-V520-3.7K M5 2.5 3.5 3.5
FR-V520-5.5K M5 2.5 5.5 5.5
FR-V520-7.5K M5 2.5 14 8
FR-V520-11K M6 4.4 14 14
FR-V520-15K M8 7.8 22 22
FR-V520-18.5K, 22K M8 7.8 38 38
FR-V520-30K M10 14.7 60 60
FR-V520-37K M10 14.7 100 100
FR-V520-45K M12 24.5 100 100
FR-V520-55K M12 24.5 150 150
Applicable Inverter
Type
Terminal
Screw Size
Tightening
Torque
N·m
HIV Cables
mm
2
R, S, T
U, V, W
FR-V540-1.5K, 2.2K M4 1.5 2 2
FR-V540-3.7K M4 1.5 2 2
FR-V540-5.5K M4 1.5 3.5 2
FR-V540-7.5K M6 4.4 3.5 3.5
FR-V540-11K M6 4.4 5.5 5.5
FR-V540-15K M6 4.4 14 8
FR-V540-18.5K M6 4.4 14 8
FR-V540-22K M6 4.4 22 14
FR-V540-30K M8 7.8 22 22
FR-V540-37K M8 7.8 38 22
FR-V540-45K M8 7.8 38 38
FR-V540-55K M8 7.8 60 60
CAUTION
• Tighten the terminal screw to the specified torque.
A screw that has been tighten too loosely can cause a short circuit or malfunction.
A screw that has been tighten too tightly can cause a short circuit or malfunction due to the unit breakage.
• The crimping terminals recommended for use to wire the power supply and motor are those provided
with insulation sleeves.
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 a
malfunction or fault of the equipment connected on the secondary side. If fast-responce current
restriction malfunctions when fast-responce current restriction function is made valid, disable fast-
responce current restriction. (Refer to Pr.156 "stall prevention operation selection". )
3 × cable resistance[m /m]× wiring distance[m] × current[A]
1000
=
Line voltage drop [V]