Wiring Fundamentals; Cable Size; Fr-A820-01250(22K) - Mitsubishi Electric FR-A800 Installation Manuallines

3.3 Wiring fundamentals

3.3.1 Cable size

Select the recommended cable size to ensure that a voltage drop will be 2% max.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause the motor torque
to decrease especially at the output of a low frequency.
The following tables indicate a selection example for the wiring length of 20m.
200V class, FR-A820 (when input power supply is 220V based on the rated current for 150% overload for 1 minute)
Applicable Inverter Type
FR-A820-00046(0.4K) to
00167(2.2K)
FR-A820-00250(3.7K)
FR-A820-00340(5.5K)
FR-A820-00490(7.5K)
FR-A820-00630(11K)
FR-A820-00770(15K)
FR-A820-00930(18.5K)

FR-A820-01250(22K)

FR-A820-01540(30K)
FR-A820-01870(37K)
FR-A820-02330(45K)
FR-A820-03160(55K)
FR-A820-03800(75K)
FR-A820-04750(90K)
Applicable Inverter Type
FR-A820-00046(0.4K) to
00167(2.2K)
FR-A820-00250(3.7K)
FR-A820-00340(5.5K)
FR-A820-00490(7.5K)
FR-A820-00630(11K)
FR-A820-00770(15K)
FR-A820-00930(18.5K)
FR-A820-01250(22K)
FR-A820-01540(30K)
FR-A820-01870(37K)
FR-A820-02330(45K)
FR-A820-03160(55K)
FR-A820-03800(75K)
FR-A820-04750(90K)
*1
For the FR-A820-03160(55K) or lower the recommended cable size is that of the HIV cable (600V class 2 vinyl-insulated cable) with
continuous maximum permissible temperature of 75°C. Assumes that the surrounding air temperature is 50°C or less and the wiring
distance is 20m or less.
For the FR-A820-03800(75K) or higher the recommended cable size is that of the LMFC cable (heat resistant flexible cross-linked
polyethylene insulated cable) with continuous maximum permissible temperature of 90°C. Assumes that the surrounding air
temperature is 50°C or less and wiring is performed in an enclosure.
*2
The recommended cable size is that of the THHW cable with continuous maximum permissible temperature of 75°C. Assumes that
the surrounding air temperature is 40°C or less and the wiring distance is 20m or less.
(Selection example for use mainly in the United States.)
*3
For the FR-A820-00770(15K) or lower the recommended cable size is that of the PVC cable with continuous maximum permissible
temperature of 70°C. Assumes that the surrounding air temperature is 40°C or less and the wiring distance is 20m or less.
For the FR-A820-00930(18.5K) or higher the recommended cable size is that of XLPE cable with continuous maximum permissible
temperature of 90°C. Assumes that the surrounding air temperature is 40°C or less and wiring is performed in an enclosure. (Selection
example for use mainly in Europe.)
*4
The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, PR, PX, P/+, N/–, P1, P3, and a screw for earthing.
The screw size for PR and PX terminals of FR-A820-00340(5.5K) and FR-A820-00490(7.5K) is indicated in brackets.
The screw size for earthing of FR-A820-00930(18.5K) or higher is indicated in brackets.
Tightening Torque
4
Terminal Screw Size *
M4
M4
M5 (M4)
M5 (M4)
M5
M6
M8 (M6)
M8 (M6)
M8 (M6)
M10 (M8)
M10 (M8)
M12 (M8)
M12 (M8)
M12 (M8)
2
HIV, etc. [mm ] *
R/L1,
S/L2, U, V, W P/+, P1
T/L3
2 2 2
3.5 3.5 3.5
5.5 5.5 5.5
14 8 14
14 14 14
22 22 22
38 38 38
38 38 38
60 60 60
80 80 80
100 100 100
100 100 100
125 125 125
150 150 150
[Nm]
R/L1, S/L2, T/L3
1.5
1.5
2.5
2.5
2.5
4.4
7.8
7.8
7.8
14.7
14.7 100-10
24.5 100-12
24.5 150-12
24.5 150-12
Cable Sizes
1
AWG/MCM *
Earth R/L1,
Cable S/L2, U, V, W
Gauge T/L3
2 14
3.5 12
5.5 10
5.5 6
8 6
14 4
14 2
22 2
22 1/0 1/0
22 3/0 3/0
38 4/0 4/0
38 4/0 4/0
38 250 250
38 300 300
WIRING
Crimping Terminal
U, V, W
2-4 2-4
5.5-4 5.5-4
5.5-5 5.5-5
14-5 8-5
14-5 14-5
22-6 22-6
38-8 38-8
38-8 38-8
60-8 60-8
80-10 80-10
100-10
100-12
150-12
150-12
2
PVC, etc. [mm
R/L1,
S/L2, U, V, W
T/L3
14 2.5 2.5
12 4 4
10 6 6
8 16 10
6 16 16
4 25 25
2 35 35
2 35 35
50 50
70 70
95 95
95 95
— —
— —
2 3
] *
Earth
Cable
Gauge
2.5
4
6
16
16
16
25
25
25
35
50
50
—
—
19