Cables And Wiring Length - Mitsubishi Electric FR-E700 Instruction Manual
Fr-e740-016 to 300 - ec; fr-e720s-008 to 110 - ec
Hide thumbs
Also See for FR-E700:
- Instruction manual (608 pages) ,
- Basic instruction manual (149 pages) ,
- Installation manuallines (38 pages)
Table of Contents
Advertisement
2.2.3
Cables and wiring length
(1)
Applied wire size
Select the recommended cable size to ensure that a voltage drop will be 2% max.
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 400V class (when input power supply is 440V)
Terminal
Applicable Inverter
Screw
Model
Size
FR-E740-016 to 095
FR-E740-120
FR-E740-170
FR-E740-230
FR-E740-300
Single-phase 200V class (when input power supply is 220V)
Terminal
Applicable Inverter
Screw
Model
Size
FR-E720S-008 to 030
M3.5
FR-E720S-050
FR-E720S-080
FR-E720S-110
∗1
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.
∗2
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.)
∗3
The recommended cable size is that of the cable (THHW 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.)
∗4
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 single-phase power input, the terminal screw size indicates the size of terminal screw for L1, N, U, V, W, PR, +, -, P1 and a screw for earthing
(grounding).
NOTE
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.
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.
Crimping
Terminal
Tightening
Torque
R/L1
N·m
∗4
S/L2
U, V, W
T/L3
M4
1.5
2-4
2-4
M4
1.5
5.5-4
2-4
M4
1.5
5.5-4
5.5-4
M4
1.5
5.5-4
5.5-4
M5
2.5
8-5
8-5
Crimping
Terminal
Tightening
Torque
N·m
∗4
L1
U, V, W
N
1.2
2-3.5
2-3.5
M4
1.5
2-4
2-4
M4
1.5
2-4
2-4
M4
1.5
5.5-4
2-4
1000
Main circuit terminal specifications
Cable Size
2
HIV Cables, etc. (mm
)
∗1
R/L1
Earth
R/L1
S/L2
U, V, W
(ground)
S/L2
T/L3
cable
T/L3
2
2
2
14
3.5
2
3.5
12
3.5
3.5
3.5
12
5.5
5.5
8
10
8
8
8
8
Cable Size
2
HIV Cables, etc. (mm
)
∗1
Earth
L1
L1
U, V, W
(ground)
N
N
cable
2
2
2
14
2
2
2
14
2
2
2
14
3.5
2
2
12
PVC Cables, etc. (mm
AWG
∗2
∗3
R/L1
Earth
U, V, W
S/L2
U, V, W
(ground)
T/L3
cable
14
2.5
2.5
14
4
2.5
12
4
4
10
6
6
8
10
10
PVC Cables, etc. (mm
AWG
∗2
∗3
Earth
L1
U, V, W
U, V, W
(ground)
N
cable
14
2.5
2.5
14
2.5
2.5
14
2.5
2.5
14
4
2.5
2
)
2.5
4
4
10
10
2
)
2.5
2.5
2.5
2
2.5
17
Hide quick links:
Advertisement
Table of Contents
