Mitsubishi Electric FR-A720-0.4K Instruction Manual page 22

For the FR-A740-55K or higher, the recommended cable size is that of the cable (THHN cable) with continuous maximum permissible temperature of
90°C. Assumes that the surrounding air temperature is 40°C or less and wiring is performed in an enclosure.
(Selection example for use mainly in the United States.)
*3 For the FR-A720-15K or lower, and FR-A740-45K or lower, 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.
For the FR-A720-18.5K or higher, and FR-A740-55K or higher, the recommended cable size is that of the cable (XLPE cable) with continuous
maximum permissible temperature of 90°C. Assumes that the surrounding air temperature is 40°C or less and wiring is performed in an enclosure.
(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, PX, P/+, N/-, P1 and a screw for earthing (grounding).
For the 5.5K and 7.5K of 200V class, screw size of terminal PR and PX is indicated in ( ).
A screw for earthing (grounding) of the 18.5K of 200V class or higher is indicated in ( ).
A screw for P/+ terminal for option connection of the 110K and 132K of 400V class is indicated in ( ).
A screw for earthing (grounding) of the 160K of 400V class or higher is indicated in ( ).
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.
(2) Notes on earthing (grounding)
• Leakage currents flow in the inverter. To prevent an electric shock, the inverter and motor must be earthed (grounded). This
inverter must be earthed (grounded). Earthing (Grounding) must conform to the requirements of national and local safety
regulations and electrical codes. (NEC section 250, IEC 536 class 1 and other applicable standards)
A neutral-point earthed (grounded) power supply for 400V class inverter in compliance with EN standard must be used.
• Use the dedicated earth (ground) terminal to earth (ground) the inverter.
(Do not use the screw in the casing, chassis, etc.)
• Use the thickest possible earth (ground) cable. Use the cable whose size is equal to or greater than that indicated in page
14, 14, and minimize the cable length. The earthing (grounding) point should be as near as possible to the inverter.
To be compliant with the EU Directive (Low Voltage Directive), earth (ground) the inverter according to
the instructions on page 196.
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Wiring
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