Cables And Wiring Length - Mitsubishi Electric FR-D720S-008SC Original Instruction

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)
Applicable Inverter Type
FR-D720S-008SC to 042SC
FR-D720S-070SC
FR-D720S-100SC
Applicable Inverter Type
FR-D720S-008SC to 042SC
FR-D720S-070SC
FR-D720S-100SC
Three-phase 400 V class (when input power supply is 440 V)
Applicable Inverter Type
FR-D740-012SC to 080SC
FR-D740-120SC
FR-D740-160SC
Applicable Inverter Type
FR-D740-012SC to 080SC
FR-D740-120SC
FR-D740-160SC
*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
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 expression:
3
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.
*4
Tightening Torque [Nm]
Terminal Screw Size
M3.5
M4
M4
2 *1
HIV [mm ]
Earth Cable
L1, N, P1, + U, V, W
Gauge
2 2
2 2
3.5 2
*4
Tightening Torque [Nm]
Terminal Screw Size
M4
M4
M4
2 *1
HIV [mm ]
R/L1, S/L2,
Earth Cable
T/L3, P/1, U, V, W
Gauge
P/+
2 2
3.5 2
3.5 3.5
wire resistance [ m / m
1000
L1, N, P1, +
1.2
1.5
1.5
Cable Sizes
*2
AWG
L1, N, P1, + U, V, W
2 14 14
2 14 14
3.5 12 14
R/L1, S/L2, T/L3, P/1, P/+
1.5
1.5
1.5
Cable Sizes
*2
AWG
R/L1, S/L,
T/L3, P/1, U, V, W
P/+
2 14 14
3.5 12 14
3.5 12 12
wiring distance [m] current [A]
Crimping Terminal
U, V, W
2-3.5 2-3.5
2-4 2-4
5.5-4 2-4
2 *3
PVC [mm ]
Earth Cable
L1, N, P1, + U, V, W
2.5 2.5
2.5 2.5
4 2.5
Crimping Terminal
U, V, W
2-4 2-4
5.5-4 2-4
5.5-4 5.5-4
2 *3
PVC [mm ]
R/L1,S/L2,
Earth Cable
T/L3, P/1, U, V, W
P/+
2.5 2.5
4 2.5
4 4
WIRING
Gauge
2.5
2.5
4
Gauge
2.5
4
4
7