6
Main circuit terminals
2.2
Main circuit terminals
Cable gauge of main circuit terminals and earth (ground) terminals
Use an appropriate cable gauge to suppress the voltage drop to 2% or less.
If the wiring distance is long between the inverter and motor, the voltage drop in the main circuit will cause the motor torque to decrease especially at a low speed.
The following table shows inverter/cable combinations for a wiring length of 20 m.
• 200 V class (220 V input power supply, 150% overload current rating for 1 minute)
• 400 V class (440 V input power supply, 150% overload current rating for 1 minute)
For FR-A820-03160(55K) or lower and FR-A840-01800(55K) or lower, this cable gauge is with the continuous maximum permissible temperature of 75°C (HIV cable
(600 V class 2 vinyl-insulated cable), etc.). Assumes that the surrounding air temperature is 50°C or less and the wiring distance is 20 m or less.
For FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher, this cable gauge is with the continuous maximum permissible temperature of 90°C or higher
(LMFC (heat resistant flexible cross-linked polyethylene insulated cable), etc.). Assumes that the surrounding air temperature is 50°C or less and the wiring is in-
enclosure.
For all the 200 V class capacities and FR-A840-01160(45K) or lower, this cable gauge is with the continuous maximum permissible temperature of 75°C (THHW cable).
This is assumes a surrounding air temperature of 40°C or less and wiring distance of 20 m or less.
For FR-A840-01800(55K) or higher, this cable gauge is with continuous maximum permissible temperature of 90°C (THHN cable). This assumes a surrounding air
temperature of 40°C or lower and in-enclosure wiring.
(For the use in the United States or Canada, refer to
For FR-A820-00770(15K) or lower and FR-A840-01160(45K) or lower, the cable gauge is with the continuous maximum permissible temperature of 70°C (PVC cable).
This assumes a surrounding air temperature of 40°C or less and wiring distance of 20 m or less.
For FR-A820-00930(18.5K) or higher and FR-A840-01800(55K) or higher, this cable gauge is with continuous maximum permissible temperature of 90°C (XLPE cable).
This assumes a surrounding air temperature of 40°C and in-enclosure wiring.
The terminal screw size indicates the size of the terminal screw for R/L1, S/L2, T/L3, U, V, W, PR, PX, P/+, N/-, P1, P3, and the screw for earthing (grounding).
The screw size for PR and PX terminals of FR-A820-00340(5.5K) and FR-A820-00490(7.5K) is indicated in parentheses.
The screw size for earthing (grounding) of FR-A820-00930(18.5K) or higher is indicated in parentheses.
The screw size for P/+ terminal for connecting an option to FR-A840-03250(110K) or FR-A840-03610(132K) is indicated in parentheses.
The screw size for earthing (grounding) of FR-A840-04320(160K) or higher is indicated in parenthesis.
The line voltage drop can be calculated by the following formula:
Line voltage drop [V] =
×
wire resistance [m
Ω
/m]
×
wiring distance [m]
×
current [A] / 1000
Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the voltage drop (torque reduction) in the low speed range.
Applicable inverter
model
Terminal
screw
size
Tightening
torque N•m
Crimp terminal
Cable gauge
HIV cables, etc. (mm
2
)
AWG/MCM
PVC cables, etc. (mm
2
)
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
P/+,
P1
Earthing
(grounding)
cable
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earthing
(grounding)
cable
FR-A820-00046(0.4K) to
00167(2.2K)
M4
1.5
2-4
2-4
2
2
2
2
14
14
2.5
2.5
2.5
FR-A820-00250(3.7K)
M4
1.5
5.5-4
5.5-4
3.5
3.5
3.5
3.5
12
12
4
4
4
FR-A820-00340(5.5K)
M5(M4)
2.5
5.5-5
5.5-5
5.5
5.5
5.5
5.5
10
10
6
6
6
FR-A820-00490(7.5K)
M5(M4)
2.5
14-5
8-5
14
8
14
5.5
6
8
16
10
16
FR-A820-00630(11K)
M5
2.5
14-5
14-5
14
14
14
8
6
6
16
16
16
FR-A820-00770(15K)
M6
4.4
22-6
22-6
22
22
22
14
4
4
25
25
16
FR-A820-00930(18.5K)
M8(M6)
7.8
38-8
22-8
38
22
38
14
2
4
35
25
25
FR-A820-01250(22K)
M8(M6)
7.8
38-8
38-8
38
38
38
22
2
2
35
35
25
FR-A820-01540(30K)
M8(M6)
7.8
60-8
60-8
60
60
60
22
1/0
1/0
50
50
25
FR-A820-01870(37K)
M10(M8)
26.5
80-10
60-10
80
60
80
22
3/0
1/0
70
70
35
FR-A820-02330(45K)
M10(M8)
26.5
100-10
100-10
100
100
100
38
4/0
4/0
95
95
50
FR-A820-03160(55K)
M12(M8)
46
100-12
100-12
100
100
100
38
4/0
4/0
95
95
50
FR-A820-03800(75K)
M12(M8)
46
150-12
150-12
125
125
125
38
250
250
120
120
―
FR-A820-04750(90K)
M12(M8)
46
150-12
150-12
150
150
150
38
300
300
150
150
―
Applicable inverter
model
Terminal
screw
size
Tightening
torque N•m
Crimp terminal
Cable gauge
HIV cables, etc. (mm
2
)
AWG/MCM
PVC cables, etc. (mm
2
)
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
P/+,
P1
Earthing
(grounding)
cable
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earthing
(grounding)
cable
FR-A840-00023(0.4K) to
00126(3.7K)
M4
1.5
2-4
2-4
2
2
2
2
14
14
2.5
2.5
2.5
FR-A840-00170(5.5K)
M4
1.5
2-4
2-4
2
2
3.5
3.5
12
14
2.5
2.5
4
FR-A840-00250(7.5K)
M4
1.5
5.5-4
5.5-4
3.5
3.5
3.5
3.5
12
12
4
4
4
FR-A840-00310(11K)
M5
2.5
5.5-5
5.5-5
5.5
5.5
5.5
5.5
10
10
6
6
10
FR-A840-00380(15K)
M5
2.5
8-5
5.5-5
8
5.5
8
5.5
8
10
10
6
10
FR-A840-00470(18.5K)
M6
4.4
14-6
8-6
14
8
14
8
6
8
16
10
16
FR-A840-00620(22K)
M6
4.4
14-6
14-6
14
14
22
14
6
6
16
16
16
FR-A840-00770(30K)
M6
4.4
22-6
22-6
22
22
22
14
4
4
25
25
16
FR-A840-00930(37K)
M8
7.8
22-8
22-8
22
22
22
14
4
4
25
25
16
FR-A840-01160(45K)
M8
7.8
38-8
38-8
38
38
38
22
1
2
50
50
25
FR-A840-01800(55K)
M8
7.8
60-8
60-8
60
60
60
22
1/0
1/0
50
50
25
FR-A840-02160(75K)
M10
26.5
60-10
60-10
60
60
60
22
1/0
1/0
50
50
25
FR-A840-02600(90K)
M10
26.5
60-10
60-10
60
60
80
22
3/0
3/0
50
50
25
FR-A840-03250(110K)
M10(M12)
26.5
80-10
80-10
80
80
80
22
3/0
3/0
70
70
35
FR-A840-03610(132K)
M10(M12)
26.5
100-10
100-10
100
100
100
38
4/0
4/0
95
95
50
FR-A840-04320(160K)
M12(M10)
46
150-12
150-12
125
125
150
38
250
250
120
120
70
FR-A840-04810(185K)
M12(M10)
46
150-12
150-12
150
150
150
38
300
300
150
150
95
FR-A840-05470(220K)
M12(M10)
46
100-12
100-12
2×100
2×100
2×100 60
2×4/0
2×4/0
2×95
2×95
95
FR-A840-06100(250K)
M12(M10)
46
100-12
100-12
2×100
2×100
2×125 60
2×4/0
2×4/0
2×95
2×95
95
FR-A840-06830(280K)
M12(M10)
46
150-12
150-12
2×125
2×125
2×125 60
2×250
2×250
2×120
2×120
120
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