INSTALLATION
US / Whisper 7/9.5/15/20 Ultra for mobile applications / May 2009 / Copyright © 2009 Mastervolt 23
2.5.5 AC power system (120 / 240 Volt)
The electric power supplied by the generator
is of a high voltage and dangerous to people.
Before working (installation) on the system
read the sections on safety in the users
manual.
Realise hat people are not used to have 120 /
240V available on a vehicle. Put warning
signs on wall sockets and on junction boxes.
Instruct non-regular users of the vehicle. Warn
maintenance personal of garages that do
service on the vehicle.
Generators used on vehicles that are
operated in a hazardous environment have
often to fulfil special regulations and additional
measures have to be taken accordingly.
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 vehicle’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 (between the generating set and the
electrical installation) should be installed to protect the
installed electrical system. The following maximum single
phase output current applies:
Maximum single phase
output current
Model
120V 240V
Whisper 7 Ultra 58 Amps 29 Amps
Whisper 9.5 Ultra 80 Amps 40 Amps
Whisper 15 Ultra 125 Amp 62 Amps
Whisper 20 Ultra 166 Amps 83 Amps
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
With the U.S.A. models neutral (N) of the AC
alternator is grounded. The housing of the
alternator and all other metal parts are
grounded as well.
The connection between “neutral” and “ground” is
necessary as part of a insulation failure protection system
as commonly used in the U.S.A.
It is possible that the electric installation in the vehicle
must be protected against insulation failures. Methods of
protection are subjected to rules that can be different
depending on the use of the vehicle and local standards.
In the standard marine manual is more information, but
this is according CE regulations for boats. Vehicles are
subject to different regulations depending on the
application of the vehicle. Experts in this field should be
consulted
3 CABLE
For the power cable we recommend the use of 3 wire
single 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 vehicle’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 vehicle 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.
Mastervolt recommends the installation of a Mass
Systemswitch 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 Mass Systemswitch switches
automatically after 10 seconds delay time over to the
generating set position.
WARNING
In all situations the transfer switches between
shore, inverter and generator should switch all
connections, the phase lines (L1 and L2) as
wel as neutral (N). Off course this is the case
when using a Mastervolt Masterswitch
To Next Page
Loading...
Need help?
General
