Mitsubishi Electric FR-E700 Series Instruction Manual page 41

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)
Applicable Inverter Type
FR-E720S-008SC to 030SC
FR-E720S-050SC
FR-E720S-080SC
FR-E720S-110SC
Tab. 3-5: Cable size
400V class (when input power supply is 440V)
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 (600V 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 20m 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 20m 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. (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).)
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 volt-
age drop (torque reduction) in the low speed range.
FR-E700SC EC
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
Terminal
Tightening
Screw R/L1,
Torque
S/L2,
[Nm]
Size
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
3 wire resistance [mΩ/m ]
×
= -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
Crimping
Terminal
HIV etc. [mm²]
U, V, L1, N, U, V,
W P1, + W
2-3.5 2 2
2-4 2 2
2-4 2 2
2-4 3.5 2
Crimping
Terminal
HIV etc. [mm²]
R/L1,
S/L2,
U, V, U, V,
T/L3,
W W
P1,
P/+
2-4 2 2
2-4 3.5 2
5.5-4 3.5 3.5
5.5-4 5.5 5.5
8-5 8 8
×
wiring distance [m]
1000
Main circuit connection
Cable Size
AWG PVC [mm²]
Earth
L1, N, U, V, L1, N,
cable
P1, + W P1, +
gauge
2 14 14 2.5
2 14 14 2.5
2 14 14 2.5
3.5 12 14 4
Cable Size
AWG PVC [mm²]
R/L1, R/L1,
Earth S/L2, S/L2,
U, V,
cable T/L3, T/L3,
W
gauge P1, P1,
P/+ P/+
2 14 14 2.5
3.5 12 14 4
3.5 12 12 4
8 10 10 6
8 8 8 10
×
current [A]
Earth
U, V,
cable
W
gauge
2.5 2.5
2.5 2.5
2.5 2.5
2.5 2.5
Earth
U, V,
cable
W
gauge
2.5 2.5
2.5 4
4 4
6 10
10 10
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