Mitsubishi Electric 800 Series Instruction Manual page 9

• Punching out the knockout holes
(1) Punch out the knockout holes by firmly tapping it with an object, such as a hammer. Remove any sharp edges and burrs from knockout holes of the wiring
cover.
For the FR-A860-00090 or lower using a provided brake resistor, punch out the knockout hole on the wiring cover for wiring the provided brake resistor. (For
how to connect the provided brake resistor, refer to
FR-A860-00090 or lower
Knockout hole for wiring of
the provided brake resistor
(2) Conduit hubs must always be used to connect conduit to the enclosure knockout. The hub shall be assembled to the conduit before it is installed in the
conduit box knockout opening.
NOTE
• Be careful not to injure yourself with the sharp edges and burrs of the knockout holes.
• To avoid wire offcuts and other foreign matter to enter the inverter, conduits must be installed to the all knockout holes.
• Wiring cover hole diameters
Hole diameter
Inverter capacity
35
FR-A860-00027 to 00090
44
FR-A860-00170, 00320
63
FR-A860-00450
WARNING
 Do not wire without using conduits. Otherwise, the cable sheathes may be scratched by the wiring cover edges, resulting in a short circuit or ground fault.
 Cable gauge of main circuit terminals and earth (ground) terminals
Use an appropriate cable gauge to suppress the voltage drop to 2% or less.
If the wiring distance is long between the inverter and motor, the voltage drop in the main circuit will cause the motor torque to decrease especially at a low speed.
The following table indicates a selection example for the wiring length of 20 m.
• 600V class (575 V input power supply, 150% overload current rating for 1 minute)
Terminal
Applicable inverter
screw
model
size

FR-A860-00027 to
M4
00090
FR-A860-00170 M4
FR-A860-00320 M5
FR-A860-00450 M6
FR-A860-00680 M8
FR-A860-01080 M8
FR-A860-01440 M10
FR-A860-01670 M10
FR-A860-02430 M10
FR-A860-02890 M12 (M10) 24.5
FR-A860-03360 M12 (M10) 24.5
FR-A860-04420 M12 (M10) 46

The cables used should be 75°C copper cables.

The terminal screw size indicates the size of terminal screw for R/L1, S/L2, T/L3, U, V, W, PR, P/+, N/-, P1, P3, and the screw for earthing (grounding), and P/+ for
option connection. A screw for earthing (grounding) of the FR-A860-02890 or higher is indicated in ( ).
The line voltage drop can be calculated by the following formula:
Line voltage drop [V] = wire resistance [mΩ/m]
×
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 crimp terminals with insulation sleeves to wire the power supply and motor.
page 11.)
Number of
(mm) holes
3 1
3 1•1/4
3 2
Crimp terminal
Tightening
torque
R/L1,
P/+,
N•m
S/L2, U, V, W
P1
T/L3
1.5 2-4 2-4 2-4
1.5 3.5-4 2-4 3.5-4
2.5 5.5-5 5.5-5 8-5
4.4 14-6 14-6 14-6
7.8 22-8 22-8 22-8
7.8 38-8 38-8 38-8
14.7 60-10 60-10 60-10
14.7 60-10 60-10 60-10
14.7 60-10 60-10 60-10
80-12 80-12 80-12
100-12 100-12 125-12
125-12 125-12 150-12
wiring distance [m]
×
FR-A860-00170 to 00450
Applicable conduit size
(Nominal diameter)
HIV cables, etc. (mm
Earthing R/L1,
(grounding) S/L2, U, V, W
cable T/L3
2-4 2 2
3.5-4 3.5 2
5.5-5 5.5 5.5
14-6 14 14
22-8 22 22
22-8 38 38
38-10 60 60
38-10 60 60
38-10 60 60
38-10 80 80
38-10 100 100
60-10 125 125
current [A] / 1000
×
Main circuit terminals
Cable gauge

2
)
Earthing R/L1,
P/+,
(grounding) S/L2, U, V, W
P1
cable T/L3
2 2 14 14
3.5 3.5 12 14
8 5.5 10 10
14 14 6 6
22 22 4 4
38 22 2 2
60 38 2 2
60 38 1/0 1/0
60 38 2/0 2/0
80 38 4/0 250
125 38 250 300
150 60 22/0 23/0
AWG/MCM
Earthing
P/+,
(grounding)
P1
cable
14 14
10 12
8 10
4 6
2 4
1/0 4
1/0 1
2/0 1
3/0 1
300 1
22/0 1
24/0 1/0
9
WIRING