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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)
Terminal
Applicable Inverter
Screw
Model
Size
FR-D720-008 to 042
M3.5
FR-D720-070 and 100
FR-D720-165
FR-D720-238
FR-D720-318
Three-phase 400V class (when input power supply is 440V)
Applicable Inverter
Model
FR-D740-012 to 080
FR-D740-120
FR-D740-160
Single-phase 200V class (when input power supply is 220V)
Applicable Inverter
Model
FR-D720S-008 to 042
FR-D720S-070
FR-D720S-100
Single-phase 100V class (when input power supply is 100V)
Terminal
Applicable Inverter
Screw
Model
Size
FR-D710W-008 to 025
M3.5
FR-D710W-042
∗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).)
Crimping
Tightening
Terminal
Torque
R/L1
N·m
∗4
S/L2
U, V, W
T/L3
1.2
2-3.5
2-3.5
M4
1.5
2-4
2-4
M4
1.5
5.5-4
5.5-4
M5
2.5
5.5-5
5.5-5
M5
2.5
14-5
8-5
Crimping
Terminal
Tightening
Terminal
Screw
Torque
R/L1
Size
N·m
∗4
S/L2
T/L3
M4
1.5
2-4
M4
1.5
5.5-4
M4
1.5
5.5-4
Crimping
Terminal
Tightening
Terminal
Screw
Torque
R/L1,
Size
N·m
∗4
S/L2
M3.5
1.2
2-3.5
M4
1.5
2-4
M4
1.5
5.5-4
Crimping
Tightening
Terminal
Torque
R/L1,
N·m
∗4
U, V, W
S/L2
1.2
2-3.5
2-3.5
M4
1.5
5.5-4
2-4
HIV Cables, etc. (mm
R/L1
Earthing
S/L2
U, V, W
(ground)
T/L3
cable
2
2
2
2
3.5
3.5
3.5
5.5
5.5
5.5
14
8
5.5
HIV Cables, etc. (mm
R/L1
Earthing
U, V, W
S/L2
U, V, W
(ground)
T/L3
cable
2-4
2
2
2-4
3.5
2
5.5-4
3.5
3.5
HIV Cables, etc. (mm
Earthing
R/L1,
U, V, W
U, V, W
(ground)
S/L2
cable
2-3.5
2
2
2-4
2
2
2-4
3.5
2
HIV Cables, etc. (mm
Earthing
R/L1,
U, V, W
(ground)
S/L2
cable
2
2
3.5
2
Cable Size
2
AWG
)
∗2
PVC Cables, etc. (mm
∗1
R/L1
R/L1
S/L2
U, V, W
S/L2
T/L3
T/L3
2
14
14
2.5
2
14
14
2.5
12
12
4
10
10
6
6
8
16
Cable Size
2
AWG
)
∗2
PVC Cables, etc. (mm
∗1
R/L1
R/L1
S/L2
U, V, W
S/L2
T/L3
T/L3
2
14
14
2.5
3.5
12
14
4
3.5
12
12
4
Cable Size
2
AWG
)
∗2
PVC Cables, etc. (mm
∗1
R/L1,
R/L1,
U, V, W
S/L2
S/L2
2
14
14
2.5
2
14
14
2.5
3.5
12
14
4
Cable Size
2
AWG
)
∗2
PVC Cables, etc. (mm
∗1
R/L1,
R/L1,
U, V, W
S/L2
S/L2
2
14
14
2.5
2
12
14
4
WIRING
2
)
∗3
Earthing
U, V, W
(ground)
cable
2.5
2.5
2.5
2.5
4
4
6
6
10
6
2
)
∗3
Earthing
U, V, W
(ground)
cable
2.5
2.5
2.5
4
4
4
2
)
∗3
Earthing
U, V, W
(ground)
cable
2.5
2.5
2.5
2.5
2.5
4
2
)
∗3
Earthing
U, V, W
(ground)
cable
2.5
2.5
2.5
2.5
7
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