Mitsubishi FR-A800-E - Page 32

Main circuit terminals
INSTALLATION AND WIRING
31
2
2.5.4 Applicable cables and the wiring length
Select a recommended cable size to ensure that the voltage drop will be 2% or less.
If the wiring distance is long between the inverter and motor, the voltage drop in the main circuit wires will cause the motor
torque to decrease especially at a low speed.
The following table indicates inverter/cable combinations for a wiring length of 20 m.
• 400 V class (440 V input power supply (with 150% rated current for one minute))
 For the FR-A846-01800(55K) 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-A846-02160(75K) 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.
 For the FR-A846-01160(45K) 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-A846-01800(55K) 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 141.)
 For the FR-A846-01160(45K) 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-A846-01800(55K) 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.)
 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 formula:
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.
NOTE
• 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.
• Use crimping terminals with insulation sleeves to wire the power supply and motor.
Applicable
inverter
model
FR-A846-[ ]
Terminal
screw
size

Tightening
torque
N·m
Crimp
terminal
Cable gauge
HIV cables, etc. (mm
2
)
AWG/MCM
PVC cables, etc. (mm
2
)
R/L1,
S/L2,
T/L3
U, V,
W
R/L1,
S/L2,
T/L3
U, V,
W
P/+
Earthing
(grounding)
cable
R/L1,
S/L2,
T/L3
U, V,
W
R/L1,
S/L2,
T/L3
U, V,
W
Earthing
(grounding)
cable
00023(0.4K) to
00126(3.7K)
M4 1.5 2-4 2-4 2 2 2 2 14 14 2.5 2.5 2.5
00170(5.5K) M4 1.5 2-4 2-4 2 2 3.5 3.5 12 14 2.5 2.5 4
00250(7.5K) M6 4.4 5.5-6 5.5-6 3.5 3.5 3.5 3.5 12 12 4 4 4
00310(11K) M6 4.4 5.5-6 5.5-6 5.5 5.5 5.5 5.5 10 10 6 6 10
00380(15K) M6 4.4 5.5-6 5.5-6 5.5 5.5 8 5.5 10 10 6 6 10
00470(18.5K) M6 4.4 8-6 8-6 8 8 14 8 8 8 10 10 16
00620(22K) M6 4.4 14-6 14-6 14 14 22 14 6 6 16 16 16
00770(30K) M6 4.4 22-6 22-6 22 22 22 14 4 4 25 25 16
00930(37K) M8 7.8 22-8 22-8 22 22 22 14 4 4 25 25 16
01160(45K) M8 7.8 38-8 38-8 38 38 38 22 2 2 50 50 25
01800(55K) M10 14.7 60-10 60-10 60 60 60 22 1/0 1/0 50 50 25
02160(75K) M10 14.7 60-10 60-10 60 60 60 22 1/0 1/0 50 50 25
02600(90K) M10 14.7 60-10 60-10 60 60 80 22 3/0 3/0 50 50 25
03250(110K) M10 14.7 80-10 80-10 80 80 80 38 3/0 3/0 70 70 35
03610(132K) M10 14.7 100-10 100-10 100 100 100 38 4/0 4/0 95 95 50
× wire resistance [mΩ/m] × wiring distance [m] × current [A]
1000