Specifications

19
WIRING
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)
*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.
Applicable Inverter Type
Terminal Screw Size *
4
Tightening Torque
[Nm]
Crimping Terminal
R/L1, S/L2, T/L3 U, V, W
FR-A820-00046(0.4K) to
00167(2.2K)
M4 1.5 2-4 2-4
FR-A820-00250(3.7K) M4 1.5 5.5-4 5.5-4
FR-A820-00340(5.5K) M5 (M4) 2.5 5.5-5 5.5-5
FR-A820-00490(7.5K) M5 (M4) 2.5 14-5 8-5
FR-A820-00630(11K) M5 2.5 14-5 14-5
FR-A820-00770(15K) M6 4.4 22-6 22-6
FR-A820-00930(18.5K) M8 (M6) 7.8 38-8 38-8
FR-A820-01250(22K) M8 (M6) 7.8 38-8 38-8
FR-A820-01540(30K) M8 (M6) 7.8 60-8 60-8
FR-A820-01870(37K) M10 (M8) 14.7 80-10 80-10
FR-A820-02330(45K) M10 (M8) 14.7 100-10 100-10
FR-A820-03160(55K) M12 (M8) 24.5 100-12 100-12
FR-A820-03800(75K) M12 (M8) 24.5 150-12 150-12
FR-A820-04750(90K) M12 (M8) 24.5 150-12 150-12
Applicable Inverter Type
Cable Sizes
HIV, etc. [mm
2
] *
1
AWG/MCM *
2
PVC, etc. [mm
2
] *
3
R/L1,
S/L2,
T/L3
U, V, W P/+, P1
Earth
Cable
Gauge
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earth
Cable
Gauge
FR-A820-00046(0.4K) to
00167(2.2K)
2 2 2 2 14 14 2.5 2.5 2.5
FR-A820-00250(3.7K) 3.5 3.5 3.5 3.5 12 12 4 4 4
FR-A820-00340(5.5K) 5.5 5.5 5.5 5.5 10 10 6 6 6
FR-A820-00490(7.5K) 14 8 14 5.5 6 8 16 10 16
FR-A820-00630(11K) 14 14 14 8 6 6 16 16 16
FR-A820-00770(15K) 22 22 22 14 4 4 25 25 16
FR-A820-00930(18.5K) 38 38 38 14 2 2 35 35 25
FR-A820-01250(22K) 38 38 38 22 2 2 35 35 25
FR-A820-01540(30K) 60 60 60 22 1/0 1/0 50 50 25
FR-A820-01870(37K) 80 80 80 22 3/0 3/0 70 70 35
FR-A820-02330(45K) 100 100 100 38 4/0 4/0 95 95 50
FR-A820-03160(55K) 100 100 100 38 4/0 4/0 95 95 50
FR-A820-03800(75K) 125 125 125 38 250 250 — — —
FR-A820-04750(90K) 150 150 150 38 300 300 — — —