Mitsubishi Electric FR-A760-00017-NA Installation Manuallines page 10

(2) Applied cable 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 (65.62feet).
600V class
Terminal
Applicable
Screw
Inverter Type
Size
FR-A760-00017-NA M4
FR-A760-00040-NA M4
FR-A760-00061-NA M4
FR-A760-00120-NA M4
FR-A760-00220-NA M5
FR-A760-00330-NA M6
FR-A760-00550-NA M8
FR-A760-00840-NA M8
*1 The cables used should be 75°C (167°F) copper cables.
*2 The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, a screw for earthing (grounding), and P/+ for option connection.
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.
CAUTION
· 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.
Crimping Terminal
Tightening
Torque
R/L1,
N·m
S/L2,
*2
U, V, W
T/L3
P/+, P1
1.5 2-4 2-4
1.5 2-4 2-4
1.5 2-4 2-4
1.5 3.5-4 2-4
2.5 5.5-5 5.5-5
4.4 14-6 14-6
7.8 22-8 22-8
7.8 38-8 38-8
mm
R/L1,
Earth
S/L2,
(Ground) U, V, W
T/L3,
Cable
P/+, P1
2-4 2
2-4 2
2-4 2
3.5-4 3.5
5.5-4 5.5 5.5
14-6 14
22-8 22
22-8 38
1000
Cable Sizes
*1
2
R/L1,
Earth
S/L2,
(Ground)
T/L3,
Cable
P/+, P1
2 2 14
2 2 14
2 2 14
2 3.5 12
5.5 10
14 14 6
22 22 4
38 22 2
WIRING
AWG
Earth
U, V, W (Ground)
Cable
14 14
14 14
14 14
14 12
10 10
6 6
4 4
2 4
8