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Earthing (Grounding) Precautions
1
INSTALLATION AND WIRING
! Wiring length
100m maximum
1.6 Earthing (Grounding) Precautions
! Leakage currents flow in the inverter. To prevent an electric shock, the inverter and
motor must be earthed (grounded). (Class D earthing (grounding), earthing
(grounding) resistance 100
Ω
maximum)
! Use the dedicated earth (ground) terminal to earth (ground) the inverter. (Do not use
the screw in the casing, chassis, etc.)
Use a tin plated* crimping terminal to connect the earth (ground) cable. When
tightening the screw, be careful not to damage the threads.
*Plating should not include zinc.
! Use the thickest possible earth (ground) cable. Use the cable whose size is equal to
or greater than that indicated below, and minimize the cable length. The earthing
(grounding) point should be as near as possible to the inverter.
(Unit: mm
2
)
For use as a product compliant with the Low Voltage Directive, use PVC cable
whose size is indicated within parentheses.
! Earth (Ground) the motor on the inverter side using one cable of the 4-core cable.
CAUTION
•When the wiring length of the 0.1K or 0.2K is 30m or more, use the carrier
frequency at 1kHz.
•If the inverter-to-motor wiring distance is long, the motor torque will decrease
due to a voltage drop in the main circuit cables especially at low frequency
output. Use thick cables for wiring to make a voltage drop less than 2%.
Motor Capacity
Earth (Ground) Cable Size
200V class
2.2kW or less 2(2.5)
3.7kW 3.5(4)
CAUTION
If the inverter is run in the low acoustic noise mode, more leakage currents flow due to
fast switching operations than in the non-low acoustic noise mode. Always use the
inverter and motor after earthing (grounding) them. When earthing (grounding) the
inverter, always use its earth (ground) terminal.