Santerno DCREG4.150 - 3.31 Converter and Motor Ground Connection

DCREG2 15P0059B3
DCREG4 USER MANUAL
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3.31 CONVERTER AND MOTOR GROUND CONNECTION
A bolted screw for the converter enclosure grounding is located close to the power wiring terminals. The
grounding screw is identified by the symbol below:
Always ground the DCREG to a state-of-the-art mains. To reduce disturbance and radiated interference to
a minimum, connect the motor grounding conductor directly to the DCREG following a parallel path to the
motor supply cables.
DANGER
Always connect the converter grounding terminal to the grid grounding using a
conductor complying with the safety regulations in force (see table below).
Always connect the motor casing to the converter grounding to avoid dangerous
voltage peaks and electric shock hazard.
Always provide a proper grounding of the converter frame and the motor casing.
DANGER
The touch current in the ground protective conductor exceeds 3.5 mAac/10 mAdc.
Please refer to the table below for the dimensioning of the protective conductors.
NOTE
To fulfil UL conformity requirements of the system where the converter is installed,
use a “UL R/C” or “UL Listed” lug to connect the converter to the grounding
system. Use a loop lug fitting the ground screw and having the same cross-section
as the ground cable being used.
Protective earthing conductor cross-section (refer to EN 61800-5-1):
Cross-sectional area of phase
conductors
of the converter (mm
2
)
Minimum cross-sectional area of the
corresponding
protective earthing conductor (mm
2
)
S ≤ 10
10 (*)
10 < S ≤ 16
S (*)
16 < S ≤ 35
16
35 < S
S/2
NOTE
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 protective earthing conductor shall
be determined in a manner which produces a conductance equivalent to that which
results from the application of the table above.
NOTE (*)
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).