INSTALLATION
16
Oktober 2010 / M-SQ25 / EN
1.5.5
AC power system (230 / 400 Volt)
Before working (installation) on the system
read the sections on safety in the users
manual.
Be sure that all electrical installations (including all safety
systems) comply with all required regulations of the local
authorities. All electrical safety/shutdown and circuit
breaking systems have to be installed onboard as the
generating set itself cannot be equipped with such
equipment for every possible variation.
The vessel’s power supply system should be suitable and
safe for the AC voltage which is applied and the power
that will be generated. Special attention has to be paid on
dividing the system in branches which are fused
individually.
It is absolutely essential that each and every circuit in the
on-board electrical system is properly installed by a
qualified electrician.
The M-SQ25 can be connected as a single phase 230 Volt
generator by an arrangement of the wiring in double
DELTA. When the wires are arranged in STAR the output
will be 230/400Volt.
Connected as a three phase 230/400 Volt generator, 3x
400 Volt is available between the phases. At the same
time 230 Volt is available between every phase and
neutral.
When applying 3 phases the installation should be laid out
in such a way that there is a reasonable balance of load
between the three phases.
To avoid problems with unbalanced loads one could apply
a 400V 3 phase to 230 Volt single phase transformer.
1 FUSE
An input fuse (from the generating set to the system)
should be installed to protect the installed electrical
system.
For the Whispers the maximum single phase current at
230V is 108 Amps. Using three phases the fuses should
be three times 36 Amps and mechanically connected. The
fuses must be of the slow reacting type. For electrical
motors connected to the system, a motor protection switch
must be installed
2 GROUNDING
The AC alternator windings are not grounded.
The housing of the alternator and all other metal parts are
grounded
To make a connection between “neutral” and “ground” is
necessary as part of a specific insulation failure protection
system.
Small pleasure craft in Europe (length up to 24 meter) is
submitted to The Recreational Craft Directive 94/25/EC.
The guidelines of this directive refer to (ISO 13297).
When the installation comply to this standard the “neutral”
and “ground” should be connected on the generating set
by connecting the blue (neutral) wire with the terminal on
which the yellow/green wire is connected.
A Ground Fault Circuit Interrupter (GFCI) or similar device
must be applied
WARNING
In all situations the transfer switches between
shore, inverter and generator should switch all
connections, the line(s) as wel as neutral.
Be aware that insulation protection systems can be
different for different applications and even within the ship
there could be different standards for different spaces. We
did refer to the Recreational Craft Directive that applies to
pleasure craft up to 24 m of length. Sometimes one has to
comply with other standards such as the rules of
certification societies like Lloyds Register of Shipping or
Veritas, regulations for the protection of personal, building
legislation, etc. It is of the greatest importance to have
expert advice on this issue.
For safety reasons connect the main ships ground to
negative point of the generating set start battery. When a
ungrounded DC system or positive grounded DC system is
applied the battery negative should not be connected to
the main ships ground.
3 CABLE
For the power cable we recommend the use of 3 wire
single phase or 5 wire tri-phase oil resistant cable with a
sufficient cross sectional area. One wire for earth is
included. For long cables it is recommended to apply
cables with a larger cross section (refer to ISO 13297
annex A)
4 TRANSFER
SWITCH
A power source selector switch much be installed between
the generating set and the ship’s electrical supply system.
This switch must ensure that all AC consumers can be
switched off at once. This switch should also be installed
to keep the generating set and shore (grid) power systems
separate.
Transfer switches - to switch over from shore to ship or
from generating set to inverter - should be well designed to
switch over all wires including neutral (and not only phases
or line) and there should be provisions with the aid of
timers to prevent relays from clattering.
