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Wiring
2.3.4 Cables and wiring length
(1) Cable size and other specifications of the main circuit terminals and the earthing terminal
Select the recommended cable size to ensure that a voltage drop will be 2% or less.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause the motor torque to
decrease especially at the output of a low frequency.
The following table indicates a selection example for the wiring length of 20m.
Three-phase 200V class (when input power supply is 220V)
Three-phase 400V class (when input power supply is 440V)
Single-phase 200V class (when input power supply is 220V)
∗1 The cable size is that of the cable (HIV cable (600V class 2 vinyl-insulated cable) etc.) with continuous maximum permissible temperature of 75°C. Assumes
that the surrounding air temperature is 50°C or less and the wiring distance is 20m or less.
∗2 The recommended cable size is that of the cable (THHW cable) with continuous maximum permissible temperature of 75°C. Assumes that the surrounding
air temperature is 40°C or less and the wiring distance is 20m or less. (Selection example for use mainly in the United States.)
∗3 The recommended cable size is that of the cable (PVC cable) with continuous maximum permissible temperature of 70°C. Assumes that the surrounding air
temperature is 40°C or less and the wiring distance is 20m or less. (Selection example for use mainly in Europe.)
∗4 The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, PR, P/+, N/-, P1 and a screw for earthing (grounding).
A screw for earthing (grounding) of the FR-E720-15KNC is indicated in ( ).
For single-phase power input, the terminal screw size indicates the size of terminal screw for R/L1, S/L2, U, V, W, PR, P/+, N/-, P1 and a screw for earthing
(grounding).
Applicable Inverter
Model
Terminal
Screw
Size ∗4
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
∗1
AWG ∗2
PVC Cables, etc. (mm
2
)
∗3
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
FR-E720-0.1KNC to 0.75KNC
M3.5 1.2 2-3.5 2-3.5 2 2 2 14 14 2.5 2.5 2.5
FR-E720-1.5KNC, 2.2KNC M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5
FR-E720-3.7KNC M4 1.5 5.5-4 5.5-4 3.5 3.5 3.5 12 12 4 4 4
FR-E720-5.5KNC M5 2.5 5.5-5 5.5-5 5.5 5.5 5.5 10 10 6 6 6
FR-E720-7.5KNC M5 2.5 14-5 8-5 14 8 5.5 6 8 16 10 6
FR-E720-11KNC M5 2.5 14-5 14-5 14 14 14 6 6 16 16 16
FR-E720-15KNC M6(M5) 4.4 22-6 22-6 22 22 14 4 4 25 25 16
Applicable Inverter
Model
Terminal
Screw
Size ∗4
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
∗1
AWG ∗2
PVC Cables, etc. (mm
2
)
∗3
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
FR-E740-0.4KNC to 3.7KNC
M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5
FR-E740-5.5KNC M4 1.5 5.5-4 2-4 3.5 2 3.5 12 14 4 2.5 4
FR-E740-7.5KNC M4 1.5 5.5-4 5.5-4 3.5 3.5 3.5 12 12 4 4 4
FR-E740-11KNC M4 1.5 5.5-4 5.5-4 5.5 5.5 8 10 10 6 6 10
FR-E740-15KNC M5 2.5 8-5 8-5 8 8 8 8 8 10 10 10
Applicable Inverter
Model
Terminal
Screw
Size ∗4
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
∗1
AWG ∗2
PVC Cables, etc. (mm
2
)
∗3
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
FR-E720S-0.1KNC to 0.4K
NC M3.5 1.2 2-3.5 2-3.5 2 2 2 14 14 2.5 2.5 2.5
FR-E720S-0.75KNC M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5
FR-E720S-1.5KNC M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5
FR-E720S-2.2KNC M4 1.5 5.5-4 2-4 3.5 2 2 12 14 4 2.5 2.5
NOTE
y 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.
y Use crimping terminals with insulation sleeve to wire the power supply and motor.