Mitsubishi Electric FR-E700 Instruction Manual page 46

Main circuit connection
Cables and wiring length
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 20 m.
200 V class (when input power supply is 230 V)
Applicable Inverter Type
FR-E720S-008SC to 030SC
FR-E720S-050SC
FR-E720S-080SC
FR-E720S-110SC
Tab. 3-5: Cable size
400 V class (when input power supply is 440 V)
Applicable Inverter Type
FR-E740-016SC to 095SC
FR-E740-120SC
FR-E740-170SC
FR-E740-230SC
FR-E740-300SC
Tab. 3-6: Cable size
The recommended cable size is that of the HIV cable (600 V class 2 vinyl-insulated cable) with
continuous maximum permissible temperature of 75 °C. Assumes that the ambient temperature
is 50 °C or less and the wiring distance is 20 m or less.
The recommended cable size is that of the THHW cable with continuous maximum permissible
temperature of 75 °C. Assumes that the ambient temperature is 40 °C or less and the wiring
distance is 20 m or less.
(Selection example for use mainly in the United States or Canada.)
The recommended cable size is that of the 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 20 m or less. (Selection example for use mainly in Europe.)
The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, PR, P/+, N/– and P1
and a screw for earthing. (For single-phase power input, the terminal screw size indicates the size
of terminal screw for L1, N, U, V, W, PR, +, – and P1 and a screw for earthing (grounding).)
3 - 10
Crimping
Terminal
Terminal
Tightening
Screw
Torque
[Nm]
Size
L1, N,
P1, +
M3.5 1.2 2-3.5
M4 1.5 2-4
M4 1.5 2-4
M4 1.5 5.5-4
Crimping
Terminal
Terminal
Tightening
Screw
Torque
R/L1,
[Nm]
Size
S/L2,
T/L3,
P1, P/+
M4 1.5 2-4
M4 1.5 5.5-4
M4 1.5 5.5-4
M4 1.5 5.5-4
M5 2.5 8-5
HIV etc. [mm²]
Earth
U, V, W L1, N,
U, V, W cable
P1, +
gauge
2-3.5 2 2 2
2-4 2 2 2
2-4 2 2 2
2-4 3.5 2 2
HIV etc. [mm²]
R/L1,
Earth
S/L2,
U, V, W U, V, W cable
T/L3,
gauge
P1, P/+
2-4 2 2 2
5.5-4 3.5 2 3.5
5.5-4 3.5 3.5 3.5
5.5-4 5.5 5.5 5.5
8-5 8 8 5.5
Cable Size
AWG PVC [mm²]
L1, N, U, V, W L1, N,
U, V, W
P1, + P1, +
14 14 2.5 2.5
14 14 2.5 2.5
14 14 2.5 2.5
12 14 4 2.5
Cable Size
AWG PVC [mm²]
R/L1, R/L1,
S/L2, S/L2,
U, V, W U, V, W
T/L3, T/L3,
P1, P/+ P1, P/+
14 14 2.5 2.5
12 14 4 2.5
12 12 4 4
10 10 6 6
8 8 10 10
Wiring
Earth
cable
gauge
2.5
2.5
2.5
2.5
Earth
cable
gauge
2.5
4
4
10
10