USER MANUAL
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2.3.10. INVERTER AND MOTOR EARTH CONNECTION
A bolted screw for the earthing of the inverter enclosure is located close to the power wiring terminals. The screw can be
located by the symbol below:
Always earth the inverter to a state-of-the-art mains. To reduce disturbance and radiated interference to a minimum,
connect the motor earthing conductor directly to the inverter following a parallel path to the motor supply cables.
Always connect the inverter earthing terminal to the grid earthing using a conductor
complying with the safety regulations in force (see table below).
Always connect the m
otor casing to the inverter earth to avoid dangerous voltage peaks
and electrical shock hazard.
Always provide proper earthing of the inverter frame and the motor casing.
To meet UL conformity requirements of the system where the inverter is installed, use a “UL
R/C” or “UL Listed” lug to connect the inverter to the earthing system. Use a loop lug fitting
the earth screw and having the same cross-section as the earth cable being used.
Protective earthing conductor cross-section (refer to EN 61800-5-1):
Cross-sectional area of phase conductors
of the inverter (mm
2
)
Minimum cross-sectional area of the corresponding
protective earthing conductor (mm
2
)
The values in the table above are valid only if the protective earthing conductor is made of the
same metal as the phase conductors.
If this is not so, the cross-sectional area of the pro
tective earthing conductor shall be
determined in a manner which produces a conductance equivalent to that which results from
the application of the table above.
In any case a cross-section of the protective earthing conductor of at least 10 mm
2
Cu or 16
mm
2
Al is required to maintain safety in case of damage to or disconnection of the protective
earthing conductor (refer to EN 61800-5-1 about Touch current).
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