520 Express Series
5-13
AC Electrical System
WARNING
Considerable care has been taken
to design a safe electrical system to
protect you from hazardous shocks.
Any modifications to the system
should always be done by an
authorized Cruisers Yachts Dealer
not only to protect your warranty,
but to protect you from hazardous
shock.
AC POWER
The standard AC electrical system in the
520 Express Series
is wired for 120/240
volts AC, 50 amps, single phase, 60 hertz
power. This allows the system to have two
lines, L1 and L2, at 120V AC and also
240V AC.The neutral (white) conductor is
connected to shore grounded neutral. The
yacht ground (green wire) is connected to
the dockside ground via a galvanic isolator.
The galvanic isolator reduces galvanic
corrosion due to stray low voltage DC
currents between the yacht ground and the
dockside earth ground.
An optional AC system for non US power is
wired for 220 volt, 32 amp, 50 hertz power.
AC Master Panel
United States Version
120/240V AC, 50 amp, 60 hertz single phase
is the standard power system. An onboard
generator will furnish 120/240V AC single
phase power.
International Version
220V AC, 32 amp, 50 hertz single phase is
the optional international power system. An
onboard generator will furnish 220V AC 50
hertz power.
The load center can receive power from
dockside or the generator. For dockside
power, move the slide protector over the
generator breaker and turn on the dockside
breaker. For generator power, move the slide
protector over the dockside breaker and turn
on the generator breaker.
CAUTION
DO NOT reset a breaker which has
been automatically tripped, without
first discovering and remedying the
cause of the problem.
The circuit breakers’ function is twofold; they
allow you to manually enable or interrupt a
circuit by flipping the switch on or off, and
they also protect the system receiving the
AC load by automatically breaking the circuit
in cases of shorts or overloads.
GENERATOR
IMPORTANT
Read the generator owner’s manual
contained in the Skipper’s Kit before
operating the generator for the first
time. The manual contains important
operation and maintenance
information.
The generator may be started from the
engine batteries unless your yacht is
equipped with a separate battery for the
generator only.
To start the generator, hold generator switch
in the START position until you hear the
generator has started, then release switch.
The switch will automatically return to the
RUN position and AC power is applied to the
load center or centers selected.
Turn generator OFF position by placing the
generator switch in the STOP position.
The power transfer slide protector prevents
accidental use of shore power and generator
power at the same time. Slide protector
positioning is discussed under OPERATION
OF AC SYSTEMS.
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