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2.3 Wiring fundamentals
2.3.1 Cable size
Select the recommended cable size to ensure that a voltage drop will be 2% max.
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 a low speed.
The following tables indicate a selection example for the wiring length of 20 m.
200 V class, FR-A820 (220 V input power supply, ND rating, without a power factor improving AC or DC reactor)
Applicable
Tightening
Terminal
inverter type
screw size
FR-A820-m-
*4
R2R
00046(0.4K) to
M4
00167(2.2K)
00250(3.7K)
M4
00340(5.5K)
M5 (M4)
00490(7.5K)
M5 (M4)
00630(11K)
M5
00770(15K)
M6
00930(18.5K)
M8 (M6)
01250(22K)
M8 (M6)
01540(30K)
M8 (M6)
01870(37K)
M10 (M8)
02330(45K)
M10 (M8)
03160(55K)
M12 (M8)
200 V class, FR-A820 (220V input power supply, ND rating, with a power factor improving AC or DC reactor)
Applicable
Tightening
Terminal
inverter type
screw size
FR-A820-m-
*4
R2R
00046(0.4K) to
M4
00167(2.2K)
00250(3.7K)
M4
00340(5.5K)
M5 (M4)
00490(7.5K)
M5 (M4)
00630(11K)
M5
00770(15K)
M6
00930(18.5K)
M8 (M6)
01250(22K)
M8 (M6)
01540(30K)
M8 (M6)
01870(37K)
M10 (M8)
02330(45K)
M10 (M8)
03160(55K)
M12 (M8)
03800(75K)
M12 (M8)
04750(90K)
M12 (M8)
For footnotes *1 to *4 refer to page 17.
Crimp terminal
torque
R/L1,
R/L1,
[Nm]
S/L2,
U, V, W
S/L2,
T/L3
T/L3
1.5
2-4
2-4
1.5
5.5-4
5.5-4
3.5
2.5
5.5-5
5.5-5
5.5
2.5
14-5
8-5
14
2.5
14-5
14-5
14
4.4
22-6
22-6
22
7.8
38-8
22-8
38
7.8
38-8
38-8
38
7.8
60-8
60-8
60
14.7
80-10
60-10
80
14.7
100-10 100-10
100
24.5
100-12 100-12
100
Crimp terminal
torque
R/L1,
R/L1,
[Nm]
S/L2,
U, V, W
S/L2,
T/L3
T/L3
1.5
2-4
2-4
1.5
5.5-4
5.5-4
3.5
2.5
5.5-5
5.5-5
5.5
2.5
14-5
8-5
14
2.5
14-5
14-5
14
4.4
22-6
22-6
22
7.8
22-8
22-8
22
7.8
38-8
38-8
38
7.8
60-8
60-8
60
14.7
60-10
60-10
60
14.7
100-10 100-10
100
24.5
100-12 100-12
100
24.5
150-12 150-12
125
24.5
150-12 150-12
150
*1
HIV, etc. [mm²]
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
22
38
14
38
38
22
60
60
22
60
80
22
100
100
38
100
100
38
*1
HIV, etc. [mm²]
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
22
38
14
38
38
22
60
60
22
60
80
22
100
100
38
100
125
38
125
150
38
150
2x100
60
Cable gauge
*2
AWG/MCM
PVC, etc. [mm²]
R/L1,
R/L1,
S/L2,
U, V, W
S/L2,
U, V, W
T/L3
T/L3
14
14
2.5
2.5
12
12
4
10
10
6
6
8
16
10
6
6
16
16
4
4
25
25
2
4
35
25
2
2
35
35
1/0
1/0
50
50
3/0
1/0
70
70
4/0
4/0
95
95
4/0
4/0
95
95
Cable gauge
*2
AWG/MCM
PVC, etc. [mm²]
R/L1,
R/L1,
S/L2,
U, V, W
S/L2,
U, V, W
T/L3
T/L3
14
14
2.5
2.5
12
12
4
10
10
6
8
8
10
10
6
6
16
16
4
4
25
25
4
4
35
25
2
2
35
35
1/0
1/0
50
50
1/0
1/0
70
70
4/0
4/0
95
95
4/0
4/0
95
95
250
250
120
120
300
300
150
150
WIRING
*3
Earthing
(grounding)
cable
2.5
4
4
6
6
16
16
16
25
25
25
35
50
50
*3
Earthing
(grounding)
cable
2.5
4
4
6
6
10
16
16
16
25
25
35
50
50
—
—
15
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