Mitsubishi Electric 800 Series Manual page 71

 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.
• 200 V class (220 V input power supply, 150% overload current rating for 1 minute)
Terminal
Applicable inverter
screw
model
size

FR-A820-00046(0.4K) to
M4 1.5
00167(2.2K)
FR-A820-00250(3.7K) M4 1.5
FR-A820-00340(5.5K) M5(M4) 2.5
FR-A820-00490(7.5K) M5(M4) 2.5
FR-A820-00630(11K) M5 2.5
FR-A820-00770(15K) M6 4.4
FR-A820-00930(18.5K) M8(M6) 7.8
FR-A820-01250(22K) M8(M6) 7.8
FR-A820-01540(30K) M8(M6) 7.8
FR-A820-01870(37K) M10(M8) 14.7
FR-A820-02330(45K) M10(M8) 14.7
FR-A820-03160(55K) M12(M8) 24.5
FR-A820-03800(75K) M12(M8)
FR-A820-04750(90K) M12(M8) 24.5
• 400 V class (440 V input power supply, 150% overload current rating for 1 minute)
Terminal
Applicable inverter
screw
model
size

FR-A840-00023(0.4K) to
M4 1.5
00126(3.7K)
FR-A840-00170(5.5K) M4 1.5
FR-A840-00250(7.5K) M4 1.5
FR-A840-00310(11K) M5 2.5
FR-A840-00380(15K) M5 2.5
FR-A840-00470(18.5K) M6 4.4
FR-A840-00620(22K) M6 4.4
FR-A840-00770(30K) M6 4.4
FR-A840-00930(37K) M8 7.8
FR-A840-01160(45K) M8 7.8
FR-A840-01800(55K) M8 7.8
FR-A840-02160(75K) M10 14.7
FR-A840-02600(90K) M10 14.7
FR-A840-03250(110K) M10(M12) 14.7
FR-A840-03610(132K) M10(M12) 14.7
FR-A840-04320(160K) M12(M10) 24.5
FR-A840-04810(185K) M12(M10) 24.5
FR-A840-05470(220K) M12(M10) 46
FR-A840-06100(250K) M12(M10) 46
FR-A840-06830(280K) M12(M10) 46

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 [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
• The selection example is for the ND rating. For selecting the SLD rating, LD rating, or HD rating, refer to the Instruction Manual (Detailed).
• 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.
Crimp terminal
Tightening
R/L1, R/L1,
torque N•m
S/L2, U, V, W S/L2,
T/L3 T/L3
2-4 2-4 2
5.5-4 5.5-4 3.5
5.5-5 5.5-5 5.5
14-5 8-5 14
14-5 14-5 14
22-6 22-6 22
38-8 22-8 38
38-8 38-8 38
60-8 60-8 60
80-10 60-10 80
100-10 100-10 100
100-12 100-12 100
24.5 150-12 150-12 125
150-12 150-12 150
Crimp terminal
Tightening
R/L1, R/L1,
torque N•m
S/L2, U, V, W S/L2,
T/L3 T/L3
2-4 2-4 2
2-4 2-4 2
5.5-4 5.5-4 3.5
5.5-5 5.5-5 5.5
8-5 5.5-5 8
14-6 8-6 14
14-6 14-6 14
22-6 22-6 22
22-8 22-8 22
38-8 38-8 38
60-8 60-8 60
60-10 60-10 60
60-10 60-10 60
80-10 80-10 80
100-10 100-10 100
150-12 150-12 125
150-12 150-12 150
100-12 100-12 2×100
100-12 100-12 2×100
150-12 150-12 2×125
page 35.)
wiring distance [m]
×
Cable gauge
2
HIV cables, etc. (mm )

Earthing
P/+,
U, V, W (grounding)
P1
cable
2 2 2 14
3.5 3.5 3.5 12
5.5 5.5 5.5 10
8 14 5.5 6
14 14 8 6
22 22 14 4
22 38 14 2
38 38 22 2
60 60 22 1/0
60 80 22 3/0
100 100 38 4/0
100 100 38 4/0
125 125 38 250
150 150 38 300
Cable gauge
2
HIV cables, etc. (mm )

Earthing
P/+,
U, V, W (grounding)
P1
cable
2 2 2 14
2 3.5 3.5 12
3.5 3.5 3.5 12
5.5 5.5 5.5 10
5.5 8 5.5 8
8 14 8 6
14 22 14 6
22 22 14 4
22 22 14 4
38 38 22 1
60 60 22 1/0
60 60 22 1/0
60 80 22 3/0
80 80 22 3/0
100 100 38 4/0
125 150 38 250
150 150 38 300
2×100 2×100 60 2×4/0
2×100 2×125 60 2×4/0
2×125 2×125 60 2×250
current [A] / 1000
×
Main circuit terminals
AWG/MCM
PVC cables, etc. (mm

R/L1, R/L1,
S/L2, U, V, W S/L2, U, V, W (grounding)
T/L3 T/L3
14 2.5 2.5 2.5
12 4 4 4
10 6 6 6
8 16 10 16
6 16 16 16
4 25 25 16
4 35 25 25
2 35 35 25
1/0 50 50 25
1/0 70 70 35
4/0 95 95 50
4/0 95 95 50
250 120 120 ―
300 150 150 ―
AWG/MCM
PVC cables, etc. (mm

R/L1, R/L1,
S/L2, U, V, W S/L2, U, V, W (grounding)
T/L3 T/L3
14 2.5 2.5 2.5
14 2.5 2.5 4
12 4 4 4
10 6 6 10
10 10 6 10
8 16 10 16
6 16 16 16
4 25 25 16
4 25 25 16
2 50 50 25
1/0 50 50 25
1/0 50 50 25
3/0 50 50 25
3/0 70 70 35
4/0 95 95 50
250 120 120 70
300 150 150 95
2×4/0 2×95 2×95 95
2×4/0 2×95 2×95 95
2×250 2×120 2×120 120
WIRING
2
)

Earthing
cable
2
)

Earthing
cable
9