MITSUBISHI ELECTRIC FR-S520E - Manual (Page 29)

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Main circuit terminals
1
WI
RING
1.2.9 Earthing (Grounding) precautions
Leakage currents flow in the inverter. To prevent an electric shock, the inverter and
motor must be earthed (grounded). Earthing (grounding) must conform to the
requirements of national and local safety regulations and electrical codes.
(JIS, NEC section 250, IEC 536 class 1 and other applicable standards)
Use the dedicated earth (ground) terminal to earth (ground) the inverter. (Do not use
the screw in the casing, chassis, etc.)
Use a tinned* 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 in the following table, and minimize the cable length.
The earthing (grounding) point should be as near as possible to the inverter.
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 wire of the 4-core cable.
Motor Capacity
Earth (Ground) Cable Size (Unit: mm 2 )
200V class, 100V class 400V class
2.2kW or less 2 (2.5) 2 (2.5)
3.7kW 3.5 (4) 2 (4)