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Main circuit terminal specifications
2.2.3 Cables and wiring length
(1) Applicable cable size
Select the recommended cable size to ensure that a voltage drop will be 2% or less.
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 table indicates a selection example for the wiring length of 20m.
200V class (when input power supply is 220V)
*1 The cable size is that of the cable (HIV cable (600V class 2 vinyl-insulated cable) etc.) 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.
*2 The recommended cable size is that of the cable (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 15K or lower, the recommended cable size is that of the cable (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 18.5K or higher, the recommended cable size is that of the cable (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, and a screw for earthing (grounding).
A screw for earthing (grounding) of the 18.5K or
higher
is indicated in ( ).
400V class (when input power supply is 440V)
Applicable Inverter
Model
Terminal
Screw
Size *4
Tightening
Torque N·m
Crimping
Terminal
Cable Sizes
HIV, etc. (mm
2
) *1
AWG/MCM *2
PVC, etc. (mm
2
) *3
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earthing
cable
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earthing
cable
FR-A721-5.5K M5 2.5 5.5-5 5.5-5 5.5 5.5 5.5 10 10 6 6 6
FR-A721-7.5K M5 2.5 14-5 8-5 14 8 5.5 6 8 16 10 16
FR-A721-11K M5 2.5 14-5 14-5 14 14 14 6 6 16 16 16
FR-A721-15K M6 4.4 22-6 22-6 22 22 14 4 4 25 25 16
FR-A721-18.5K M8(M6) 7.8 38-8 38-8 38 38 22 2 2 35 35 25
FR-A721-22K M8(M6) 7.8 38-8 38-8 38 38 22 2 2 35 35 25
FR-A721-30K M8(M6) 7.8 60-8 60-8 60 60 22 1/0 1/0 50 50 25
FR-A721-37K M10(M8) 14.7 80-10 80-10 80 80 22 3/0 3/0 70 70 35
FR-A721-45K M10(M8) 14.7 100-10 100-10 100 100 38 4/0 4/0 95 95 50
FR-A721-55K M12(M8) 24.5 100-12 100-12 100 100 38 4/0 4/0 95 95 50
Applicable Inverter
Model
Terminal
Screw
Size *4
Tightening
Torque N·m
Crimping
Terminal
Cable Sizes
HIV, etc. (mm
2
) *1
AWG/MCM *2
PVC, etc. (mm
2
) *3
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earthing
Cable
R/L1,
S/L2,
T/L3
U, V, W
R/L1,
S/L2,
T/L3
U, V, W
Earthing
Cable
FR-A741-5.5K M4 1.5 2-4 2-4 2 2 3.5 12 14 2.5 2.5 4
FR-A741-7.5K M4 1.5 5.5-4 5.5-4 3.5 3.5 3.5 12 12 4 4 4
FR-A741-11K M5 2.5 5.5-5 5.5-5 5.5 5.5 8 10 10 6 6 10
FR-A741-15K M5 2.5 8-5 8-5 8 8 8 8 8 10 10 10
FR-A741-18.5K M6 4.4 14-6 8-6 14 8 14 6 8 16 10 16
FR-A741-22K M6 4.4 14-6 14-6 14 14 14 6 6 16 16 16
FR-A741-30K M6 4.4 22-6 22-6 22 22 14 4 4 25 25 16
FR-A741-37K M8 7.8 22-8 22-8 22 22 14 4 4 25 25 16
FR-A741-45K M8 7.8 38-8 38-8 38 38 22 1 2 50 50 25
FR-A741-55K M8 7.8 60-8 60-8 60 60 22 1/0 1/0 50 50 25
*1 The cable size is that of the cable (HIV cable (600V class 2 vinyl-insulated cable) etc.) 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.
*2 For the 45K or lower, the recommended cable size is that of the cable (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.
For the 55K, the recommended cable size is that of the cable (THHN 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 the United States.)
*3 For the 45K or lower, the recommended cable size is that of the cable (PVC cable) with continuous maximum permissible temperature of 70°C. Assumes
that the ambient temperature is 40°C or less and the wiring distance is 20m or less.
For the 55K, the recommended cable size is that of the cable (XLPE cable) with continuous maximum permissible temperature of 90°C. Assumes that
the ambient temperature is 40°C or less and wiring is performed in an enclosure.
(Selection example for use mainly in Europe.)