7
WIRING
4.3
Cables and Wiring Length
4.3.1 Cable 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 tables indicate a selection example for the wiring length of 20 m.
Single-phase 200 V class (when input power supply is 220 V)
Three-phase 400 V class (when input power supply is 440 V)
The line voltage drop can be calculated by the following expression:
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.
Applicable Inverter Type
Terminal Screw Size
*4
Tightening Torque [Nm]
Crimping Terminal
L1, N, P1, +
U, V, W
FR-D720S-008SC to 042SC
M3.5
1.2
2-3.5
2-3.5
FR-D720S-070SC
M4
1.5
2-4
2-4
FR-D720S-100SC
M4
1.5
5.5-4
2-4
Applicable Inverter Type
Cable Sizes
HIV [mm
2
]
*1
AWG
*2
PVC [mm
2
]
*3
L1, N, P1, +
U, V, W
Earth Cable
Gauge
L1, N, P1, +
U, V, W
L1, N, P1, +
U, V, W
Earth Cable
Gauge
FR-D720S-008SC to 042SC
2
2
2
14
14
2.5
2.5
2.5
FR-D720S-070SC
2
2
2
14
14
2.5
2.5
2.5
FR-D720S-100SC
3.5
2
3.5
12
14
4
2.5
4
Applicable Inverter Type
Terminal Screw Size
*4
Tightening Torque [Nm]
Crimping Terminal
R/L1, S/L2, T/L3, P/1, P/+
U, V, W
FR-D740-012SC to 080SC
M4
1.5
2-4
2-4
FR-D740-120SC
M4
1.5
5.5-4
2-4
FR-D740-160SC
M4
1.5
5.5-4
5.5-4
Applicable Inverter Type
Cable Sizes
HIV [mm
2
]
*1
AWG
*2
PVC [mm
2
]
*3
R/L1, S/L2,
T/L3, P/1,
P/+
U, V, W
Earth Cable
Gauge
R/L1, S/L,
T/L3, P/1,
P/+
U, V, W
R/L1,S/L2,
T/L3, P/1,
P/+
U, V, W
Earth Cable
Gauge
FR-D740-012SC to 080SC
2
2
2
14
14
2.5
2.5
2.5
FR-D740-120SC
3.5
2
3.5
12
14
4
2.5
4
FR-D740-160SC
3.5
3.5
3.5
12
12
4
4
4
*1
The recommended cable size is that of the HIV cable (600 V class 2 vinyl-insulated cable) with continuous maximum permissible temperature of 75 °C. Assumes that
the ambient temperature is 50 °C or less and the wiring distance is 20 m or less.
*2
The recommended cable size is that of the THHW cable with continuous maximum permissible temperature of 75 °C. Assumes that the ambient temperature is
40 °C or less and the wiring distance is 20 m or less.
(Selection example for use mainly in the United States.)
*3
The recommended cable size is that of the PVC cable with continuous maximum permissible temperature of 70 °C. Assumes that the ambient temperature is 40 °C
or less and the wiring distance is 20 m 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, PR, P/+, N/–, P1 and a screw for earthing.
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).
CAUTION
앫
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.
앫
Use crimping terminals with insulation sleeve to wire the power supply and motor.
3
wire resistance [ m
/ m
wiring distance [m]
current [A]
1000
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Содержание FR-D720S-008SC
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