# Mitsubishi Electric FR-E700 Instruction Manual Page 43

Frequency inverter.

Wiring
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 20m.
200V class (when input power supply is 230V)
Terminal
Applicable Inverter
Screw
Type
Size
FR-E720S-008 to 030
M3,5
FR-E720S-050
M4
FR-E720S-080
M4
FR-E720S-110
M4
Tab. 3-5:
Cable size
400V class (when input power supply is 440V)
Terminal
Applicable Inverter
Screw
Type
Size
FR-E740-016 to 095
M4
FR-E740-120
M4
FR-E740-170
M4
FR-E740-230
M4
FR-E740-300
M5
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.)
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 20m or less.
The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, 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).)
The line voltage drop can be calculated by the following expression:
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.
FR-E700 EC
Crimping
Tighten-
Terminal
ing
Torque
L1, N,
L1, N,
[Nm]
P1, + U, V, W
P1, +
1,2
2-3,5 2-3,5
2
1,5
2-4
2-4
2
1,5
2-4
2-4
2
1,5
5,5-4
2-4
3,5
Crimping
Tighten-
Terminal
ing
Torque
L1, N,
L1, N,
[Nm]
U, V, W
P1, +
P1, +
1,5
2-4
2-4
2
1,5
5,5-4
2-4
3,5
1,5
5,5-4 5,5-4
3,5
1,5
5,5-4 5,5-4
5,5
2,5
8-5
8-5
8
×
wire restistance [mΩ/m ]
3
=
------------------------------------------------------------------------------------------------------------------------------------------------------------------------ -
Cable Size
HIV etc. [mm²]
Earth
L1, N,
U, V, W
cable
P1, +
gauge
2
2
14
2
2
14
2
2
14
2
3,5
12
Cable Size
HIV etc. [mm²]
AWG
Earth
L1, N,
U, V, W
cable
P1, +
gauge
2
2
14
2
3,5
12
3,5
3,5
12
5,5
8
10
8
8
8
×
wiring distance [m]
1000
Main circuit connection
AWG
PVC [mm²]
L1, N,
U, V, W
U, V, W
P1, +
14
2,5
2,5
14
2,5
2,5
14
2,5
2,5
14
4
2,5
PVC [mm²]
L1, N,
U, V, W
U, V, W
P1, +
14
2,5
2,5
14
4
2,5
12
4
4
10
6
6
8
10
10
×
current [A]
Earth
cable
gauge
2,5
2,5
2,5
4
Earth
cable
gauge
2,5
4
4
10
10
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