# Mitsubishi Electric FR-B-750 to 75K Instruction Manual Page 30

Fr-b-750 to 75k (200v class), fr-b-750 to 110k (400v class).

400V class (when input power supply is 440V)
Applicable Inverter Type
FR-B
FR-B-750 to 3700
FR-B3-(N)H400 to 3700
-
FR-B3-(N)H5.5K
FR-B-7.5K
FR-B3-(N)H7.5K
-
FR-B3-(N)H11K
FR-B-15K
FR-B3-(N)H15K
-
FR-B3-(N)H18.5K
FR-B-22K
FR-B3-(N)H22K
-
FR-B3-(N)H30K
FR-B-37K
FR-B3-(N)H37K
FR-B-55K
FR-B-75K
FR-B-90K
FR-B-110K
*1
For the 55K or less, 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 ambient temperature is 50°C or less and the wiring distance is 20m or less.
For the 75K or more, the recommended cable size is that of the cable (LMFC (heat resistant flexible cross-linked polyethylene insulated cable) etc.) with
continuous maximum permissible temperature of 90°C. Assumes that the ambient temperature is 50°C or less and wiring is performed in an enclosure.
*2
The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, and a screw for earthing (grounding).
For the 110K , screw sizes are different (R/L1, S/L2, T/L3, U, V, W, a screw for earthing (grounding) - P/+ for option connection)
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.
CAUTION
· Tighten the terminal screw to the specified torque.
A screw that has been tighten too loosely can cause a short circuit or malfunction.
A screw that has been tighten 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.
Terminal
Tightening
Screw
Torque N·m
Size
*2
FR-B3
M4
M4
M4
M5
M5
M6
M6
M6
M8
-
M8
-
M10
-
M10
-
M10-M12
1000
Main circuit terminal specifications
Crimping
Terminal
R/L1,
U, V, W
S/L2,
T/L3
1.5
2-4
2-4
1.5
2-4
2-4
1.5
5.5-4
5.5-4
2.5
5.5-5
5.5-5
2.5
8-5
8-5
4.4
14-6
8-6
4.4
14-6
14-6
4.4
22-6
22-6
7.8
22-8
22-8
7.8
60-8
60-8
14.7
60-10
60-10
14.7
60-10
60-10
14.7
80-10
80-10
Cable Sizes
2
HIV, etc. (mm
)
*1
Earth
R/L1,
U, V, W
P/+, P1
(Ground)
S/L2,
T/L3
Cable
2
2
2
2
2
3.5
3.5
3.5
3.5
5.5
5.5
5.5
8
8
8
14
8
14
14
14
22
22
22
22
22
22
22
60
60
60
60
60
60
60
60
80
80
80
80
2
3.5
3.5
8
8
14
14
14
14
22
38
38
38
2
21