Instruction manual

6
Main circuit terminal specifications
3.2.2 Cables and wiring length
(1) Cable sizes etc., of the main control circuit terminals and earth (ground) terminals
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 table indicates a selection example for the wiring length of 20m (65.61feet).
200V class (when input power supply is 220V)
400V class (when input power supply is 440V)
∗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 ( 167°F ).
Assumes that the ambient temperature is 50°C (
122°F ) or less and the wiring distance is 20m (65.61feet) or less.
∗2 The recommended cable size is that of the cable (THHW cable) with continuous maximum permissible temperature of 75°C (
167°F ). Assumes that the
ambient temperature is 40°C (
104°F ) or less and the wiring distance is 20m (65.61feet) or less.
(Selection example for use mainly in the United States.)
∗3 The recommended cable size is that of the cable (THHW cable) with continuous maximum permissible temperature of 70°C (
158°F ). Assumes that the
ambient temperature is 40°C (
104°F ) or less and the wiring distance is 20m (65.61feet) or less.
(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, P/+, N/-, P1 and a screw for earthing (grounding).
A screw for earthing (grounding) of the FR-E720-600 is indicated in ( ).
The line voltage drop can be calculated by the following formula:
line voltage drop [V]=
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.
Applicable Inverter
Model
Terminal
Screw
Size ∗4
Tightening
Torque
N · m
Crimping
Term inal
Cable Size
HIV Cables, etc. (mm
2
) ∗1
AWG ∗2
PVC Cables, etc. (mm
2
)
∗3
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
FR-E720-008 to 050 M3.5 1.2 2-3.5 2-3.5 2 2 2 14 14 2.5 2.5 2.5
FR-E720-080, 110 M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5
FR-E720-175 M4 1.5 5.5-4 5.5-4 3.5 3.5 3.5 12 12 4 4 4
FR-E720-240 M5 2.5 5.5-5 5.5-5 5.5 5.5 5.5 10 10 6 6 6
FR-E720-330 M5 2.5 14-5 8-5 14 8 5.5 6 8 16 10 6
FR-E720-470 M5 2.5 14-5 14-5 14 14 14 6 6 16 16 16
FR-E720-600 M6(M5) 4.4 22-6 22-6 22 22 14 4 4 25 25 16
Applicable Inverter
Model
Terminal
Screw
Size ∗4
Tightening
Torque
N · m
Crimping
Term inal
Cable Size
HIV Cables, etc. (mm
2
) ∗1
AWG ∗2
PVC Cables, etc. (mm
2
)
∗3
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
R/L1
S/L2
T/L3
U, V, W
R/L1
S/L2
T/L3
U, V, W
Earth
(ground)
cable
FR-E740-016 to 095 M4 1.5 2-4 2-4 2 2 2 14 14 2.5 2.5 2.5
FR-E740-120 M4 1.5 5.5-4 2-4 3.5 2 3.5 12 14 4 2.5 4
FR-E740-170 M4 1.5 5.5-4 5.5-4 3.5 3.5 3.5 12 12 4 4 4
FR-E740-230 M4 1.5 5.5-4 5.5-4 5.5 5.5 8 10 10 6 6 10
FR-E740-300 M5 2.5 8-5 8-5 8 8 8 8 8 10 10 10
NOTE
y Tighten the terminal screw to the specified torque. A screw that has been tighten too loosely can cause a short circuit
or malfunction. A screw that has been tighten too tightly can cause a short circuit or malfunction due to the unit
breakage.
y Use crimping terminals with insulation sleeve to wire the power supply and motor.
3 × wire resistance[mΩ/m] × wiring distance[m] × current[A]
1000
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