Mitsubishi Electric 800 Series Instruction Manual page 41

Main circuit terminals
2.5.3
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.
• 600V class (575 V input power supply, 150% overload current rating for 1 minute)
Applicable Terminal
inverter screw
model size

FR-A860-00027
M4
to 00090
FR-A860-00170 M4
FR-A860-00320 M5
FR-A860-00450 M6
FR-A860-00680 M8
FR-A860-01080 M8
FR-A860-01440 M10
FR-A860-01670 M10
FR-A860-02430 M10
FR-A860-02890 M12(M10) 24.5
FR-A860-03360 M12(M10) 24.5
FR-A860-04420 M12(M10) 46

The cables used should be 75°C copper cables.

The terminal screw size indicates the size of terminal screw for R/L1, S/L2, T/L3, U, V, W, PR, P/+, N/-, P1, P3, and the screw for earthing
(grounding), and P/+ for option connection. A screw for earthing (grounding) of the FR-A860-02890 or higher is indicated in ( ).
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 crimping terminals with insulation sleeves to wire the power supply and motor.
40
INSTALLATION AND WIRING
Crimping terminal
Tightening
torque
R/L1,
U, V, P/+,
N•m
S/L2,
W P1
T/L3
1.5 2-4 2-4 2-4
1.5 3.5-4 2-4 3.5-4 3.5-4
2.5 5.5-5 5.5-5 8-5
4.4 14-6 14-6 14-6
7.8 22-8 22-8 22-8
7.8 38-8 38-8 38-8
14.7 60-10 60-10 60-10 38-10
14.7 60-10 60-10 60-10 38-10
14.7 60-10 60-10 60-10 38-10
80-12 80-12 80-12 38-10
100-12 100-12 125-12 38-10
125-12 125-12 150-12 60-10
× wire resistance [mΩ/m] × wiring distance [m] × current [A]
1000
HIV cables, etc. (mm
Earthing R/L1,
U, V, P/+,
(grounding) S/L2,
W P1
cable T/L3
2-4 2 2 2
3.5 2 3.5
5.5-5 5.5 5.5 8
14-6 14 14 14
22-8 22 22 22
22-8 38 38 38
60 60 60
60 60 60
60 60 60
80 80 80
100 100 125
125 125 150
Cable gauge

2
AWG/MCM
)
Earthing R/L1,
U, V, P/+,
(grounding) S/L2,
W P1
cable T/L3
2 14 14 14
3.5 12 14 10
5.5 10 10 8
14 6 6 4
22 4 4 2
22 2 2 1/0
38 2 2 1/0
38 1/0 1/0 2/0
38 2/0 2/0 3/0
38 4/0 250 300
38 250 300 22/0 1
60 22/0 23/0 24/0 1/0
Earthing
(grounding)
cable
14
12
10
6
4
4
1
1
1
1