7
3.2.2
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 (65.61feet).
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)
Single-phase 100V class (when input power supply is 100V)
∗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 (167°F).
Assumes that the surrounding air temperature is 50°C (122°F) or less and the wiring distance is 20m (65.61feet) or less.
∗2
The recommended cable size is that of the cable (THHW cable) with continuous maximum permissible temperature of 75°C (167°F). Assumes that the
surrounding air temperature is 40°C (104°F) or less and the wiring distance is 20m (65.61feet) 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 (158°F). Assumes that the
surrounding air temperature is 40°C (104°F) or less and the wiring distance is 20m (65.61feet) 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).
(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
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
AWG
PVC Cables, etc. (mm
2
)
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earthing
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earthing
(ground)
cable
FR-D720-008 to 042
M3.5
1.2
2-3.5
2-3.5
2
2
2
14
14
2.5
2.5
2.5
FR-D720-070 and 100
M4
1.5
2-4
2-4
2
2
2
14
14
2.5
2.5
2.5
FR-D720-165
M4
1.5
5.5-4
5.5-4
3.5
3.5
3.5
12
12
4
4
4
FR-D720-238
M5
2.5
5.5-5
5.5-5
5.5
5.5
5.5
10
10
6
6
6
FR-D720-318
M5
2.5
14-5
8-5
14
8
5.5
6
8
16
10
6
Applicable Inverter
Model
Terminal
Screw
Size
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
AWG
PVC Cables, etc. (mm
2
)
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earthing
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earthing
(ground)
cable
FR-D740-012 to 080
M4
1.5
2-4
2-4
2
2
2
14
14
2.5
2.5
2.5
FR-D740-120
M4
1.5
5.5-4
2-4
3.5
2
3.5
12
14
4
2.5
4
FR-D740-160
M4
1.5
5.5-4
5.5-4
3.5
3.5
3.5
12
12
4
4
4
Applicable Inverter
Model
Terminal
Screw
Size
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
AWG
PVC Cables, etc. (mm
2
)
R/L1,
S/L2 U, V, W
R/L1,
S/L2 U, V, W
Earthing
(ground)
cable
R/L1,
S/L2 U, V, W
R/L1,
S/L2 U, V, W
Earthing
(ground)
cable
FR-D720S-008 to 042
M3.5
1.2
2-3.5
2-3.5
2
2
2
14
14
2.5
2.5
2.5
FR-D720S-070
M4
1.5
2-4
2-4
2
2
2
14
14
2.5
2.5
2.5
FR-D720S-100
M4
1.5
5.5-4
2-4
3.5
2
3.5
12
14
4
2.5
4
Applicable Inverter
Model
Terminal
Screw
Size
Tightening
Torque
N
·
m
Crimping
Terminal
Cable Size
HIV Cables, etc. (mm
2
)
AWG
PVC Cables, etc. (mm
2
)
R/L1,
S/L2 U, V, W
R/L1,
S/L2
U, V, W
Earthing
(ground)
cable
R/L1,
S/L2 U, V, W
R/L1,
S/L2 U, V, W
Earthing
(ground)
cable
FR-D710W-008 to 025
M3.5
1.2
2-3.5
2-3.5
2
2
2
14
14
2.5
2.5
2.5
FR-D710W-042
M4
1.5
5.5-4
2-4
3.5
2
2
12
14
4
2.5
2.5
