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Cables And Wiring Length - Mitsubishi Electric FR-F700PJ Instruction Manual

Air-conditioning inverter.
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Main circuit terminal specifications
2.2.4

Cables and wiring length

(1)
Applicable wire size
Select the recommended cable size to ensure that a voltage drop will be 2% or less.
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.
Three-phase 200V class (when input power supply is 220V)
Terminal
Applicable Inverter
Screw
Model
Size
FR-F720PJ-0.4K, 0.75K
M3.5
FR-F720PJ-1.5K, 2.2K
M4
FR-F720PJ-3.7K
M4
FR-F720PJ-5.5K
M5
FR-F720PJ-7.5K
M5
FR-F720PJ-11K
M5
M6
FR-F720PJ-15K

(M5)
Three-phase 400V class (when input power supply is 440V)
Terminal
Applicable Inverter
Screw
Model
Size
FR-F740PJ-0.4K to 3.7K
M4
FR-F740PJ-5.5K
M4
FR-F740PJ-7.5K
M4
FR-F740PJ-11K
M4
M5
FR-F740PJ-15K

(M6)

The cable size is that of the cable (HIV cable (600V class 2 vinyl-insulated cable) etc.) with continuous maximum permissible temperature of 75°C. Assumes
that the surrounding air temperature is 50°C or less and the wiring distance is 20m or less.

The recommended cable size is that of the cable (THHW cable) with continuous maximum permissible temperature of 75°C. Assumes that the surrounding
air temperature is 40°C or less and the wiring distance is 20m or less.
(Selection example for use mainly in the United States.)

The recommended cable size is that of the cable (PVC cable) with continuous maximum permissible temperature of 70°C. Assumes that the surrounding air
temperature is 40°C or less and the wiring distance is 20m or less.
(Selection example for use mainly in Europe.)

The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, PR, P/+, N/-, P1 and a screw for earthing (grounding). Terminal screw size
for Filterpack (FR-BFP2) is same as the terminal screw size for the inverter.

Screw size for earthing (grounding) the FR-F720PJ-15K is indicated in parentheses.

Screw sizes of the terminals R0, S0, and T0 and the earthing terminal of FR-BFP2-H15K are indicated in parentheses.

For the earthing (grounding) cable size for Filterpack, use the same size as for the inverter.
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 sleeve to wire the power supply and motor.
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.
22
Crimping
Terminal
Tightening
Torque
R/L1
N·m

S/L2
U, V, W
T/L3
1.2
2-3.5
2-3.5
1.5
2-4
2-4
1.5
5.5-4
5.5-4
2.5
5.5-5
5.5-5
2.5
14-5
8-5
2.5
14-5
14-5
4.4
22-6
22-6
(2.5)
(14-5)
(14-5)
Crimping
Terminal
Tightening
Torque
R/L1
N·m

S/L2
U, V, W
T/L3
1.5
2-4
2-4
1.5
5.5-4
2-4
1.5
5.5-4
5.5-4
1.5
5.5-4
5.5-4
2.5
8-5
8-5
(4.4)
(14-6)
(14-6)
1000
2
HIV Cables, etc. (mm
)

Earthing
R/L1
(grounding)
S/L2
U, V, W
cable
T/L3

2
2
2
2
2
2
3.5
3.5
3.5
5.5
5.5
5.5
14
8
5.5
14
14
8
22
22
14
2
HIV Cables, etc. (mm
)

Earthing
R/L1
(grounding)
S/L2
U, V, W
cable
T/L3

2
2
2
3.5
2
3.5
3.5
3.5
3.5
5.5
5.5
5.5
8
8
5.5
Cable Size
AWG

PVC Cables, etc. (mm
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
6
8
16
10
6
6
16
16
4
4
25
25
Cable Size
AWG

PVC Cables, etc. (mm
R/L1
R/L1
S/L2
U, V, W
S/L2
U, V, W
T/L3
T/L3
14
14
2.5
2.5
12
14
4
2.5
12
12
4
4
10
10
6
6
8
8
10
10
2
)

Earthing
(grounding)
cable

2.5
2.5
4
6
6
16
16
2
)

Earthing
(grounding)
cable

2.5
4
4
10
10

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