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2.5.3
Applicable cables and 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 will cause the motor torque to
decrease especially at a low speed.
The following table shows a selection example for the wiring length of 20 m.
• Three-phase 400 V class
Applicable
Terminal
inverter model
screw
FR-CS84-[]
size
012, 022
M4
036 to 080
M4
120
M4
160
M4
230
M4
295
M4
• Single-phase 200V class
Applicable
Terminal
inverter model
screw
FR-CS82S-[]
size
025, 042
M3.5
070
M4
100
M4
*1
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.
*2
It is the gauge of the cable with 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.
(Selection example mainly for use in the United States.)
*3
When using a single-phase power input model, terminals are R/L1 and S/L2.
*4
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.
(Selection example mainly for use in Europe.)
*5
It indicates the size of screw for terminals R/L1, S/L2, T/L3, U, V, W, P/+, and N/- and a terminal for earthing (grounding).
The line voltage drop can be calculated by the following formula:
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 crimp terminals with insulation sleeves to wire the power supply and motor.
Total wiring length
With induction motor
Connect one or more general-purpose motors within the total wiring length shown in the following table.
Cable type
012
Unshielded
50 m
Shielded
25 m
32
2. INSTALLATION AND WIRING
2.5 Main circuit terminals
Crimp terminal
Tightening
torque
R/L1,
*5
N·m
S/L2,
U, V, W
*3
T/L3
1.2
2-3.5
2-3.5
1.5
2-4
2-4
1.5
5.5-4
2-4
1.5
5.5-4
5.5-4
2.5
8-5
8-5
2.5
8-5
8-5
Crimp terminal
Tightening
torque
R/L1,
*5
N·m
S/L2,
U, V, W
*3
T/L3
1.2
2-3.5
2-3.5
1.5
2-4
2-4
1.5
5.5-4
2-4
3
× wire resistance [mΩ/m] × wiring distance [m] × current [A]
Model FR-CS84-[]
022
036
050
50 m
50 m
50 m
25 m
50 m
50 m
2
HIV cables, etc. (mm
)
R/L1,
Earthing
S/L2,
U, V, W
(grounding)
*3
T/L3
cable
2
2
2
2
2
2
3.5
2
3.5
3.5
3.5
3.5
8
8
5.5
8
8
5.5
2
HIV cables, etc. (mm
)
R/L1,
Earthing
S/L2,
U, V, W
(grounding)
*3
T/L3
cable
2
2
2
2
2
2
3.5
2
3.5
1000
120
080
160
50 m
100 m
100 m
100 m
50 m
100 m
100 m
100 m
Cable gauge
*1
*2
AWG/MCM
PVC cables, etc. (mm
R/L1,
R/L1,
S/L2,
U, V, W
S/L2,
*3
T/L3
T/L3
14
14
2.5
14
14
2.5
12
14
4
12
12
4
8
8
10
8
8
10
Cable gauge
*1
*2
AWG/MCM
PVC cables, etc. (mm
R/L1,
R/L1,
S/L2,
U, V, W
S/L2,
*3
T/L3
T/L3
14
14
2.5
14
14
2.5
12
14
4
Model FR-CS82S-[]
230
295
025
042
100 m
50 m
50 m
100 m
25 m
25 m
*4
2
)
Earthing
U, V, W
(grounding)
*3
cable
2.5
2.5
2.5
2.5
2.5
4
4
4
6
10
10
10
*4
2
)
Earthing
U, V, W
(grounding)
*3
cable
2.5
2.5
2.5
2.5
2.5
4
070
100
50 m
50 m
50 m
50 m
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