Cables And Wiring Length - Mitsubishi Electric FR-E720-600 Instruction Manual

2.2.3

Cables and wiring length

(1) Applied wire size
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)
Terminal
Applicable Inverter
Screw
Model
Size
FR-E720-008 to 050 M3.5
FR-E720-080, 110
FR-E720-175
FR-E720-240
FR-E720-330
FR-E720-470
FR-E720-600 M6(M5)
400V class (when input power supply is 440V)
Terminal
Applicable Inverter
Screw
Model
Size
FR-E740-016 to 095
FR-E740-120
FR-E740-170
∗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, and a screw for earthing (grounding).
A screw for earthing (grounding) of the FR-E720-600 is indicated in ( ).
NOTE
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.
Use crimping terminals with insulation sleeve to wire the power supply and motor.
The line voltage drop can be calculated by the following formula:
3 × wire resistance[mΩ/m] × wiring distance[m] × current[A]
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.
Crimping
Terminal
Tightening
Torque
R/L1
N·m
∗4
S/L2 U, V, W
T/L3
1.2 2-3.5 2-3.5
M4 1.5 2-4 2-4
M4 1.5 5.5-4 5.5-4
M5 2.5 5.5-5 5.5-5
M5 2.5 14-5 8-5
M5 2.5 14-5 14-5
4.4 22-6 22-6
Crimping
Terminal
Tightening
Torque
R/L1
N·m
∗4
S/L2 U, V, W
T/L3
M4 1.5 2-4 2-4
M4 1.5 5.5-4 2-4
M4 1.5 5.5-4 5.5-4
1000
Main circuit terminal specifications
Cable Size
2
HIV Cables, etc. (mm )
∗1
R/L1 Earth R/L1
S/L2 U, V, W (ground) S/L2
T/L3 cable T/L3
2 2 2 14
2 2 2 14
3.5 3.5 3.5 12
5.5 5.5 5.5 10
14 8 5.5 6
14 14 14 6
22 22 14 4
Cable Size
2
HIV Cables, etc. (mm )
∗1
R/L1 Earth R/L1
S/L2 U, V, W (ground) S/L2
T/L3 cable T/L3
2 2 2 14
3.5 2 3.5 12
3.5 3.5 3.5 12
PVC Cables, etc. (mm
AWG
∗2
∗3
R/L1 Earth
U, V, W S/L2 U, V, W (ground)
T/L3 cable
14 2.5 2.5
14 2.5 2.5
12 4 4
10 6 6
8 16 10
6 16 16
4 25 25
PVC Cables, etc. (mm
AWG
∗2
∗3
R/L1 Earth
U, V, W S/L2 U, V, W (ground)
T/L3 cable
14 2.5 2.5
14 4 2.5
12 4 4
2
)
2.5
2.5
4
6
6
16
16
2
)
2
2.5
4
4
17