Mitsubishi Electric FR-E500 Instruction Manual page 33

Notes on Grounding
z Leakage currents flow in the inverter. To prevent an electric shock, the inverter
and motor must be grounded.
z Use the dedicated ground terminal to ground the inverter. (Do not use the screw
in the case, chassis, etc.) For the earth connection avoid direct contact between
aluminium and copper. Tin-plated cable lugs can be used if the plating does not
contain zinc. When tightening the screws take care not to damage the thread in
the aluminium frame.
z The ground cable should be as thick as possible. Use the cable whose gauge is
equal to or larger than those indicated in the following table, and make its length
as short as possible. The grounding point should be as near as possible to the
inverter to minimize the ground cable length.
Motor Capacity
2.2kW (3HP) or less
3.7kW (5HP)
5.5kW (7.5HP), 7.5kW (10HP)
To meet the Low Voltage Directive, use PVC insulated cables larger than
specified size in brackets ( ).
z Ground the motor on the inverter side using one wire of the 4-core cable.
INSTALLATION AND WIRING
Ground Cable Gauge
100V class 200V class
2 2 (2.5)

3.5 (4)

5.5 (6)
20
2
(Unit: mm )
400V class
2 (2.5)
2 (4)
3.5 (4)