10
May 2003 / WHISPER 20 ULTRA / USA
INFORMATION
2.4.2 Generator control panel
1
Fuse 10A;
2
Fuse 3A;
3
Start/stop button.
2.4.3 Remote control panel
1
Start button;
2
Stop button;
3
Select button;
4
Set button;
5
Failure lamp;
6
Generator load indicator.
7
Display
2.5 TECHNICAL INFORMATION
2.5.1 AC
alternator
The single phase synchronous alternator is directly
coupled, one bearing, brushless, rotating field design,
four pole (1800 RPM) and self regulating.
Residual magnetism causes a small voltage over the sta-
tor windings and allows a current to flow in the windings,
which is magnified because of the feed back effect be-
tween rotor and stator. The field windings in the rotor are
short-circuited over a diode to rectify the current. A capa-
citor over an additional winding in the stator which is in
an angle with the power-winding keeps the voltage stable
within 5% at the specified rpm and provides voltage fall
off with speed, preventing over-excitation at low engine
speeds and softening the effect of load switching to
relieve the burden on the engine.
Further technical data on the design of the alternator can
be found in drawings and diagrams in this manual.
2.5.2 Engine
The Whisper generating set is based on the Mitsubishi
S4Q2 4 cylinder diesel engine. The engine is indirectly
injected. The engine is water cooled and the cooling
liquid is cooled by a heat exchanger and raw water. The
heat exchanger and all other parts which are in direct
contact with the raw (sea) water are made of seawater
resistant material like naval brass and gunmetal.
The engine has been specially adapted for the Mastervolt
application and is very different from the standard engine
as supplied for industrial applications!
2.5.3 Digital Diesel Control system
The standard electrical engine control system is 12 Volt
negative earth, non earth return is available as optional.
Check your identification data to determine which system
is applied. The system is designed according to the
"energise to run" system. The Digital Diesel Control is a
very advanced microprocessor based full automatic
system. Besides automatic start the system offers many
monitoring options. Refer to the separate Digital Diesel
Control users manual.
The microprocessor unit is located on top of the
alternator.
External Fuel Pump
Protection-fuse
10 A
Digital Diesel Control
Protection-fuse 3 A
Remove fuse
during maintenance
Whisper Generator Control
Press for start/stop
10 A
3 A
1
2
3
Fig. 5: Digital Diesel remote control panel.
Fig.. 3: Control panel.
hold
gnd
te
m
str
.
exh
oil
re
g
alt.
fuel
heat start
fuel fail
st
gl
+
pull
ct
-2
ct
-1
ct
-1
ct
-2
AC-1
AC-2
Fig.. 4: Digital Diesel Control unit
6
1
2
7
4
3
5
