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following equipment:
• 1 PC/MCC (Power Center / Motor Control
Center), 2 incoming and bus tie with dedicated
ATS (Automatic Transfer Switch);
• 1 VDS for main motor and compressor,
dedicated flages are installed on the floor of
the LER for the water cooling system of the
VSD;
• 1 fire and gas control panel, installed on the air
lock compartment;
• 1 switchgear dedicated to HVAC control panel
and building distribution;
• 1 UPS (Uninterruptible Power Supply)
(redundant system) the batteries are installed
on dedicated battery room.
Fig. 6– The Local Equipment Room (LER) during assembly The fully redundant chillers are suitable for
outdoor installation at 55 °C ambient temperature
variable frequency converter are listed in table 3. and provide the cooling of the VFD secondary
Additionally, a complete set of hardware features coolant (water) down to 25 °C. It contains scroll
and built-in protections allow the monitoring, compressors, refrigerant (R134a), evaporator,
controlling, protecting of the complete PDS with condensers, anti-sand grids, fans.
the VFD’s digital control unit.
the functional acceptance
The local equipment room and test at Nidec ASI
the chiller in Monfalcone
The LER (figure 6) consists of 2 fire-proof shelters, A further success factor in the implementation of
mounted onto a concrete structure and completed this highly demanding project was Nidec ASI’s
by fully redundant HVAC (Heating Ventilating Air capability to perform the PDS test at full-load (i.e.
Conditioning) packaged units. Within its overall full power and full speed) on their premises, which
outline of 12.2 × 6.0 × 3.7 m, it contains the successfully validated design and solutions before
the shipment to site. This test required consistent
test room equipment, such as regenerative electrical
braking load (synchronous generator) and power
supply capability (only needed to compensate the
losses of all the components in the back-to-back
loop) (figure 7).
A further success factor in the
implementation of this highly demanding
project was Nidec ASI’s capability to
perform the PDS test at full-load (i.e. full
power and full speed) on their premises,
which successfully validated design and
solutions before the shipment to site
Fig. 7 - Full acceptance test the string test at
schematics Termomeccanica Pompe
at La Spezia
Given the particular complexity of the supply,
functional tests had to be included to test the
perfect operation of the motor-pump “string” and
Impiantistica Italiana - Maggio-Giugno 2015 65
