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2.2.3
Cables and wiring length
(1) Applicable cable size
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 (65.62feet).
200V class (when input power supply is 220V)
Terminal
Applicable Inverter
Screw
Model
Size
*4
FR-F720-00046 to
M4
00105-NA
FR-F720-00167-NA
M4
FR-F720-00250-NA
M4
FR-F720-00340-NA
M5(M4)
FR-F720-00490-NA
M5(M4)
FR-F720-00630-NA
M5
FR-F720-00770-NA
M6
FR-F720-00930-NA
M8(M6)
FR-F720-01250-NA
M8(M6)
FR-F720-01540-NA
M8(M6)
FR-F720-01870-NA M10(M8)
FR-F720-02330-NA M10(M8)
FR-F720-03160-NA M12(M10)
FR-F720-03800-NA M12(M10)
FR-F720-04750-NA M12(M10)
*1
The recommended cable size is that of the cable (e.g. HIV cable (600V class 2 vinyl-insulated cable)) 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 (65.62feet) 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 (65.62feet) or less.
(Selection example for use mainly in the United States.)
*3
For the FR-F720-00930 or lower, 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(65.62feet) or
less.
For the FR-F720-01250 or higher, the recommended cable size is that of the cable (XLPE cable) with continuous maximum permissible
temperature of 90°C (194°F). Assumes that the surrounding air temperature is 40°C (104°F) or less and wiring is performed in an enclosure.
(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, PX, P/+, N/-, P1 and a screw for earthing (grounding).
The screw size for earthing (grounding) of the FR-F720-00930 or higher is indicated in ( ).
*5
When connecting the option unit to P/+, P1, N/-, use THHN cables for the option and terminals R/L1, S/L2, T/L3, U, V, W.
Crimping
Terminal
Tightening
Torque
R/L1,
R/L1,
N·m
U, V, W
S/L2,
S/L2,
T/L3
T/L3
1.5
2-4
2-4
1.5
5.5-4
5.5-4
3.5
1.5
5.5-4
5.5-4
5.5
2.5
14-5
8-5
14
2.5
14-5
14-5
14
2.5
22-5
22-5
22
4.4
38-6
38-6
38
7.8
38-8
38-8
38
7.8
60-8
60-8
60
7.8
80-8
80-8
80
14.7
100-10 100-10
100
14.7
100-10 100-10
100
24.5
150-12 150-12
125
24.5
150-12 150-12
150
24.5
100-12 100-12 2×100 2×100 2×100
Main circuit terminal specifications
Cable Sizes
2
HIV, etc. (mm
)
*1
Earthing
U, V, W P/+, P1
(grounding)
cable
2
2
2
2
3.5
3.5
3.5
5.5
5.5
5.5
8
14
5.5
14
14
8
22
22
14
38
38
14
38
38
22
60
60
22
80
80
22
100
100
38
100
100
38
125
150
38
150 2×100
38
60
AWG/MCM
PVC, etc. (mm
*2
R/L1,
R/L1,
U, V, W
U, V, W
(grounding)
S/L2,
S/L2,
T/L3
T/L3
14
14
2.5
2.5
12
12
4
4
10
10
6
6
6
8
16
10
6
6
16
16
4
6 (
)
25
25
*5
2
2
50
50
2
2
50
50
1/0
1/0
50
50
3/0
3/0
70
70
4/0
4/0
95
95
4/0
4/0
95
95
⎯
⎯
250
250
⎯
⎯
2×4/0 2×4/0
⎯
⎯
2×4/0 2×4/0
2
)
*3
Earthing
cable
2.5
4
6
16
16
16
25
25
25
35
50
50
⎯
⎯
⎯
2
21
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