Mitsubishi Electric 800 Series Instruction Manual page 8

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 indicates a selection example for the wiring length of 20 m.
 SLD rating (Pr.570 Multiple rating setting = "0")
• 600 V class (575 V input power supply)
Terminal
Applicable
screw
inverter model
size

FR-F860-00680 M8
FR-F860-01080 M8
FR-F860-01440 M10
FR-F860-01670 M10
FR-F860-02430 M10
FR-F860-02890 M12 (M10) 24.5
FR-F860-03360 M12 (M10) 24.5
FR-F860-04420 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-F860-02890 or higher is indicated in ( ).
 LD rating (Pr.570 Multiple rating setting = "1")
• 600 V class (575 V input power supply)
Terminal
Applicable
screw
inverter model
size

FR-F860-00680 M8
FR-F860-01080 M8
FR-F860-01440 M10
FR-F860-01670 M10
FR-F860-02430 M10
FR-F860-02890 M12 (M10) 24.5
FR-F860-03360 M12 (M10) 24.5
FR-F860-04420 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-F860-02890 or higher is indicated in ( ).
The line voltage drop can be calculated by the following formula:
Line voltage drop [V] = wire resistance [mΩ/m]
×
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.
8
WIRING
Crimp terminal
Tightening
torque
R/L1,
P/+,
N•m
S/L2, U, V, W
P1
T/L3
7.8 22-8 22-8 22-8
7.8 38-8 38-8 38-8
14.7 60-10 60-10 60-10
14.7 60-10 60-10 60-10
14.7 80-10 80-10 80-10
100-12 100-12 100-12
125-12 125-12 125-12
2×80-12 2×80-12 2×80-12 60-10
Crimp terminal
Tightening
torque
R/L1,
N•m P/+,
S/L2, U, V, W
P1
T/L3
7.8 22-8 22-8 22-8
7.8 38-8 38-8 38-8
14.7 60-10 60-10 60-10
14.7 60-10 60-10 60-10
14.7 80-10 80-10 80-10
100-12 100-12 100-12
125-12 125-12 125-12
2×80-12 2×80-12 2×80-12 60-10
wiring distance [m]
×
HIV cables, etc. (mm
Earthing R/L1,
P/+,
(grounding) S/L2, U, V, W
P1
cable T/L3
22-8 22 22 22
22-8 38 38 38
38-10 60 60 60
38-10 60 60 60
38-10 80 80 80
38-10 100 100 100
38-10 125 125 125
2×80 2×80 2×80
HIV cables, etc. (mm
Earthing R/L1,
P/+,
(grounding) S/L2, U, V, W
P1
cable T/L3
22-8 22 22 22
22-8 38 38 38
38-10 60 60 60
38-10 60 60 60
38-10 80 80 80
38-10 100 100 100
38-10 125 125 125
2×80 2×80 2×80
current [A] / 1000
×
Cable gauge

2
AWG/MCM
)
Earthing R/L1,
P/+,
(grounding) S/L2, U, V, W
P1
cable T/L3
22 4 4 2
22 1 1 1/0
38 1/0 1/0 1/0
38 2/0 2/0 2/0
38 4/0 250 4/0
38 250 300 250
38 2×2/0 2×2/0 2×2/0
60 2×4/0 2×250 2×4/0
Cable gauge

2
AWG/MCM
)
Earthing R/L1,
P/+,
(grounding) S/L2, U, V, W
P1
cable T/L3
22 4 4 2
22 2 2 1/0
38 1/0 1/0 1/0
38 2/0 2/0 2/0
38 4/0 250 4/0
38 250 300 250
38 2×2/0 2×3/0 2×2/0
60 2×4/0 2×250 2×4/0
Earthing
(grounding)
cable
4
4
1
1
1
1
1
1/0
Earthing
(grounding)
cable
4
4
1
1
1
1
1
1/0