INSTALLATION
18 Copyright © 2008 Mastervolt / October 2008 / WHISPER 15/20 ULTRA - Three Phase / US
1.5.5 AC power system (120/208 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 Whisper 15 / 20 ULTRA Three Phase can be
connected in the following ways:
- As a 120/240Volt split phase generator by an
arrangement of the wiring in double DELTA.
- As a 3 x 120V/208 Volt three phase generator when
the wires are arranged in double STAR. Here, 3x 208
Volt is available between the phases while 120 Volt is
available between every phase and neutral.
See chapter 3 for connection of the AC-terminals. With all
applications the installation should be laid out in such a
way that there is a reasonable balance of load between
the different phases.
1 FUSE
Output fuses (between the generating set and the
electrical installation) should be installed to protect the
installed electrical system. The following maximum output
current applies for each separate phase:
Model Maximum output
current
Whisper 15 Ultra Three Phase 3 x 28 Amp
Whisper 20 Ultra Three Phase 3 x 34 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
With the U.S.A. models neutral 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.
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 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.
WARNING
In all situations the transfer switches between
shore, inverter and generator should switch all
connections, the phase lines (L1, L2, L3) as
wel as neutral (N).
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