Whisper Power M-SC3.5 Installation Manual page 15

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.
1 FUSE
An output fuse (from the generating set to the system)
should be installed to protect the installed electrical
system. The fuse should be sized such that the rated
generating set current is not exceeded by more than 15%.
The maximum single phase output current is as listed
below:
Model Maximum output current
M-SC3.5 – 3000 rpm 13 Amp
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. Measures
against earth insulation failures are often subject to local
regulations. The housing of the alternator and all other
metal parts are grounded. For safety reasons connect the
main ships ground to negative point of the generating set
start battery. When an ungrounded return DC system or
positive grounded DC system is applied the battery
negative should not be connected to the main ships
ground.
To make a connection between "neutral" and "ground"
could be necessary as part of a specific insulation failure
protection system.
Small pleasure craft in Europe 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.
EN / M-SC3.5 / September 2010
WARNING
In all situations the transfer switches between
shore, inverter and generator should switch all
connections, the phase line (L) as well as
neutral (N). Of course this is the case when
using a Whisper Power transfer switch.
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.
3 CABLE
For the power cable we recommend the oil resistant cable
with the following cross sectional area:
Model Cross sectional area
M-SC3.5 – 3000 rpm 3x2.5 mm² (5m. included)
For very long cables it is recommended to apply cables
with a larger cross section than the mentioned above.
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 chattering.
Whisper Power advises the installation of a Whisper
Power transfer switch as the power source selector. This
works automatically when the generating set is not running
the input remains in the shore position and as soon as the
generating set is running the transfer switch switches
automatically after 10 seconds delay time over to the
generating set position.
INSTALLATION
15