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Connecting cables
To connect cables to terminals R/L1, S/L2, T/L3, U, V, and W, the FR-A8CW (wire connection attachment) is required. (Refer
to the Option Installation Manual for the wiring method using the FR-A8CW.)
Bus bar connection
The following table shows the recommended cable size for cables that are 20 m in length (690 V input power supply).
• Converter unit (FR-CC2)
Terminal
Converter model
screw
FR-CC2-N[]-P
*2
size
450K to 560K
M12 (M10)
• Inverter
Terminal
Inverter model
screw
FR-A872-[]-P
*2
size
05690 to 07150
M12 (M10)
*1
The recommended cable size is that of the cable (XLPE cable) with continuous maximum permissible temperature of 90°C. It assumes a
surrounding air temperature of 40°C or lower and in-enclosure wiring.
(Selection example mainly for use in Europe.)
*2
The screw size for terminals R/L1, S/L2, T/L3, U, V, W, P/+, N/-, and the earthing (grounding) terminal are shown.
Screw size for earthing (grounding) is indicated in parentheses.
The line voltage drop can be calculated by the following formula:
× wire resistance [mΩ/m] × wiring distance [m] × current [A]
Line voltage drop [V] =
Use a larger diameter cable (or a bus bar) 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.
• The creepage distance between terminals is 15.4 mm. When more insulation distance is required, secure a sufficient distance
or use insulating material for bus bars.
Total wiring length
The total wiring length between the inverters in parallel connection and a motor must be 500 m or less. It is determined by
calculating the sum of length of "a" (a cable from the master inverter to the node point), "a'" (a cable from each slave inverter
to the node point), and "b" (a cable from the node point to the motor) in the figure. (It must be 100 m or less under Vector
control.) Furthermore, the cable length must be 10 to 30 m between each inverter and the node point (a/a').
Example for connecting two inverters in parallel
Inverter (master)
U
V
W
a
Inverter (slave)
a'
U
V
W
Total wiring length = a + a' + b
500 m (100 m under vector control)
Bus bar dimensions (for each
Tightening
phase)
torque (N·m)
R, S, T
46
6 mm thick and 40 mm wide
Bus bar dimensions (for each phase)
Tightening
torque (N·m)
U, V, W
46
6 mm thick and 40 mm wide 6 mm thick and 60 mm wide 2×80
1000
b
M
Earth (ground) cable size
2
*1
PVC cables, etc. (mm
)
2×80
Earth (ground) cable size
P, N
PVC cables, etc. (mm
2. INSTALLATION AND WIRING
2.5 Main circuit terminals
1
2
3
4
5
2
*1
)
6
7
8
9
10
45
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