ASEA AC55LC-3, Operation Manual

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AC55LC-3, AC63LC-3, and AC75LC-3 Operations Manual....
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3 INTRODUCTION TO THE CONVERTERS
The AC55LC-3, AC63LC-3, and AC75LC-3 are high performance Shore Power Converters. These
models are internally oil-cooled, where a customer-managed water cooling loop carries away heat
energy from the cooling oil via a base-mounted heat exchanger. The main oil reservoir is sealed to
the point that it is splash-proof; therefore, the converter must remain vertical at all times. As a result,
these converters are intended for motor yachts and cannot be used with sailing yachts, catamarans, or
any other vehicle that may spend time heeled.
These converters will accept any three phase input service with a frequency between 40-70Hertz, and
a voltage between 170-520VAC. The output power form has been programmed at the factory for the
voltage and frequency required by your yacht.
Dual-conversion technology is the preferred technique for AC power conversion, and was chosen for
the system design. In this technology, the shore power service is isolated by the transformer and then
converted to DC power by the DC power supply module. The output inverters then convert the DC
power back to the required AC form (both voltage and frequency) required by the yacht.
FIGURE 1 SYSTEM BLOCK DIAGRAM