Mitsubishi Electric 800 Series Installation Manualline page 13

2.3 Wiring fundamentals
2.3.1 Cable size
Select the recommended cable size to ensure that the voltage drop will be 2% max.
If the wiring distance is long between the inverter and motor, the main circuit cable voltage drop will cause the motor torque to
decrease especially at the output of a low speed.
The following tables indicate a selection example for the wiring length of 20 m.
400 V class (440 V input power supply (with 120% rated current for one minute)
Applicable Terminal
Tightening
screw
inverter type torque
*4
FR-F846-ã size
00023(0.75K)
M4
to 00083(3.7K)
00126(5.5K) M4
00170(7.5K) M4
00250(11K) M6
00310(15K) M6
00380(18.5K) M6
00470(22K) M6
00620(30K) M6
00770(37K) M6
00930(45K) M8
01160(55K) M8
01800(75K) M10
02160(90K) M10
02600(110K) M10
03250(132K) M10
03610(160K) M10
*1
For the FR-F846-01800(75K) or lower, it is the gauge of a cable with the continuous maximum permissible temperature of 75 °C (HIV cable
(600 V grade heat-resistant PVC insulated wire), etc.). It assumes a surrounding air temperature of 50 °C or lower and the wiring distance of
20 m or shorter.
For the FR-F846-02160(90K) or higher, it is the gauge of the cable with the continuous maximum permissible temperature of 90 °C or higher.
(LMFC (heat resistant flexible cross-linked polyethylene insulated cable), etc.). It assumes a surrounding air temperature of 50 °C or lower.
*2
For the FR-F846-01160(55K) or lower, it is the gauge of a cable with the continuous maximum permissible temperature of 75 °C (THHW cable).
It assumes a surrounding air temperature of 40 °C or lower and the wiring distance of 20 m or shorter.
For the FR-F846-01800(75K) or higher, it is the gauge of a cable with the continuous maximum permissible temperature of 90 °C (THHN cable).
It assumes a surrounding air temperature of 40 °C or lower. (For the use in the United States or Canada, refer to page 41.)
*3
For the FR-F846-01160(55K) or lower, it is the gauge of a cable with the continuous maximum permissible temperature of 70 °C (PVC cable). It
assumes a surrounding air temperature of 40 °C or lower and the wiring distance of 20 m or shorter.
For the FR-F846-01800(75K) or higher, it is the gauge of a cable with the continuous maximum permissible temperature of 90 °C (XLPE cable). It
assumes a surrounding air temperature of 40 °C or lower. (Selection example for use mainly in Europe.)
*4
The terminal screw size indicates the size of terminal screw for R/L1, S/L2, T/L3, U, V, W, P/+, N/-, P1, and a screw for earthing (grounding).
The line voltage drop can be calculated by the following expression:
√3 × wire resistance [mΩ/m] × wiring distance [m] x 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
l Tighten the terminal screw to the specified torque.
A screw that has been tightened too loosely can cause a short circuit or malfunction.
A screw that has been tightened too tightly can cause a short circuit or malfunction due to the unit breakage.
l Use crimping terminals with insulation sleeve to wire the power supply and motor.
Crimping
terminal
R/L1, R/L1,
[Nm]
S/L2, U, V, W S/L2,
T/L3 T/L3
1.5 2-4 2-4 2
1.5 2-4 2-4 2
1.5 2-4 2-4 3.5
4.4 5.5-6 5.5-6 5.5
4.4 5.5-6 5.5-6 5.5
4.4 8-6 8-6 8
4.4 14-6 14-6 14
4.4 22-6 22-6 22
4.4 22-6 22-6 22
7.8 38-8 38-8 38
7.8 60-8 60-8 60
14.7 60-10 60-10 60
14.7 60-10 60-10 60
14.7 80-10 80-10 80
14.7 100-10 100-10 100
14.7 150-10 150-10 125
1000
Cable gauge
*1
HIV cables, etc. [mm²]
Earthing
U, V, W P/+ (grounding)
cable
2 2 2
2 3.5 3.5
3.5 3.5 3.5
5.5 5.5 5.5
5.5 8 5.5
8 14 8
14 22 14
22 22 14
22 22 14
38 38 22
60 60 22
60 60 22
60 80 22
80 80 38
100 100 38
125 150 38
*2
AWG/MCM PVC cables, etc. [mm²]
R/L1, R/L1,
S/L2, U, V, W S/L2, U, V, W
T/L3 T/L3
14 14 2.5 2.5
14 14 2.5 2.5
12 12 4 4
10 10 6 6
10 10 6 6
8 8 10 10
6 6 16 16
4 4 25 25
4 4 25 25
2 2 50 50
1/0 1/0 50 50
1/0 1/0 50 50
1/0 1/0 50 50
3/0 3/0 70 70
4/0 4/0 95 95
250 250 120 120
WIRING
*3
Earthing
(grounding)
cable
2.5
2.5
4
6
6
10
16
16
16
25
25
25
25
35
50
70
7