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2.5.4
Applicable cables and the wiring length
Select a recommended cable size to ensure that the voltage drop will be 2% or less.
If the wiring distance is long between the inverter and motor, the voltage drop in the main circuit wires will cause the motor
torque to decrease especially at a low speed.
The following table indicates a selection example for the wiring length of 20 m.
• 400 V class (440 V input power supply (with 120% rated current for one minute))
Applicable
Terminal
Tightening
inverter
screw
torque
model
size
N·m
FR-F846-[ ]
00023(0.75K)
M4
1.5
to 00083(3.7K)
00126(5.5K)
M4
1.5
00170(7.5K)
M4
1.5
00250(11K)
M6
4.4
00310(15K)
M6
4.4
00380(18.5K) M6
4.4
00470(22K)
M6
4.4
00620(30K)
M6
4.4
00770(37K)
M6
4.4
00930(45K)
M8
7.8
01160(55K)
M8
7.8
01800(75K)
M10
14.7
02160(90K)
M10
14.7
02600(110K)
M10
14.7
03250(132K)
M10
14.7
03610(160K)
M10
14.7
For the FR-F846-01800(75K) or lower, it is the gauge of a cable with the continuous maximum permissible temperature of 75°C (HIV cable (600
V grade heat-resistant PVC insulated wire), etc.). It assumes a surrounding air temperature of 50°C or lower and the wiring distance of 20 m or
shorter.
For the FR-F846-02160(90K) or higher, it is the gauge of the cable with the continuous maximum permissible temperature of 90°C or higher.
(LMFC (heat resistant flexible cross-linked polyethylene insulated cable), etc.). It assumes a surrounding air temperature of 50°C or lower.
For the FR-F846-01160(55K) or lower, it is the gauge of a cable with the continuous maximum permissible temperature of 75°C (THHW cable).
It assumes a surrounding air temperature of 40°C or lower and the wiring distance of 20 m or shorter.
For the FR-F846-01800(75K) or higher, it is the gauge of a cable with the continuous maximum permissible temperature of 90°C (THHN cable).
It assumes a surrounding air temperature of 40°C or lower. (For the use in the United States or Canada, refer to
For the FR-F846-01160(55K) or lower, it is the gauge of a cable with the continuous maximum permissible temperature of 70°C (PVC cable). It
assumes a surrounding air temperature of 40°C or lower and the wiring distance of 20 m or shorter.
For the FR-F846-01800(75K) or higher, it is the gauge of a cable with the continuous maximum permissible temperature of 90°C (XLPE cable).
It assumes a surrounding air temperature of 40°C or lower. (Selection example for use mainly in Europe.)
The terminal screw size indicates the size of terminal screw for R/L1, S/L2, T/L3, U, V, W, P/+, N/-, P1, and a screw for earthing (grounding).
The line voltage drop can be calculated by the following formula:
× wire resistance [mΩ/m] × wiring distance [m] × current [A]
Line voltage drop [V]=
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.
NOTE
• Tighten the terminal screw to the specified torque.
A screw that has been tightened too loosely can cause a short circuit or malfunction.
A screw that has been tightened too tightly can cause a short circuit or malfunction due to the unit breakage.
• Use crimping terminals with insulation sleeves to wire the power supply and motor.
Crimping
terminal
HIV cables, etc. (mm
R/L1,
R/L1,
U, V,
U, V,
S/L2,
S/L2,
W
W
T/L3
T/L3
2-4
2-4
2
2
2-4
2-4
2
2
2-4
2-4
3.5
3.5
5.5-6
5.5-6
5.5
5.5
5.5-6
5.5-6
5.5
5.5
8-6
8-6
8
8
14-6
14-6
14
14
22-6
22-6
22
22
22-6
22-6
22
22
38-8
38-8
38
38
60-8
60-8
60
60
60-10 60-10 60
60
60-10 60-10 60
60
80-10 80-10 80
80
100-10 100-10 100
100
150-10 150-10 125
125
1000
Cable gauge
2
AWG/MCM
)
Earthing
R/L1,
U, V,
P/+
(grounding)
S/L2,
cable
T/L3
2
2
14
14
3.5
3.5
14
14
3.5
3.5
12
12
5.5
5.5
10
10
8
5.5
10
10
14
8
8
8
22
14
6
6
22
14
4
4
22
14
4
4
38
22
2
2
60
22
1/0
1/0
60
22
1/0
1/0
80
22
1/0
1/0
80
38
3/0
3/0
100
38
4/0
4/0
150
38
250
250
INSTALLATION AND WIRING
Main circuit terminals
2
PVC cables, etc. (mm
R/L1,
Earthing
U, V,
S/L2,
(grounding)
W
W
T/L3
cable
2.5
2.5
2.5
2.5
2.5
2.5
4
4
4
6
6
6
6
6
6
10
10
10
16
16
16
25
25
16
25
25
16
50
50
25
50
50
25
50
50
25
50
50
25
70
70
35
95
95
50
120
120
70
page
122.)
)
2
29
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