INFORMATION
12
Copyright © 2008 Mastervolt / December 2008 / Whisper 12 Ultra - Three phase for mobile applications/ EN
2.4.2
Generator control panel
Start / Stop
Remove fuse
Internal fuel pump
Fuse 3A
before maintenance
Digital Diesel Control
Fuse 3A
Auxiliary
Fuse 10A
External Fuel Pump
Fuse 3A
Observe instructions in the manual
Replace fuses with same type and rating
Whisper Digital Diesel Operation Unit
Fig: 7 Control panel.
Fig. 8 Digital Diesel Control unit
2.4.3
Remote control panel
04
03
02
01
05
07
06
01
Generator load indicator
02 Failure
LED
03 Start
button
04 Stop
button
05 Display
06 Select
button
07 Set
button
Fig. 9: Digital Diesel remote control panel
2.5 TECHNICAL
INFORMATION
2.5.1
AC alternator
The tri phase synchronous alternator is directly coupled,
one bearing, brushless, rotating field design, 6 or 12 wire
(depending on the alternator model), four pole, (1500
RPM) and regulated by an Automatic Voltage Regulator
(AVR).
The exciter stator has a residual magnetism, which
guarantees self-exciting of the generator on start-up (that
thereby generates a residual voltage of about 10%
nominal voltage).
Fig. 10 Automatic Voltage Regulator (AVR).
The AVR, powered by an auxiliary circuit on the main
stator, acts on the exciter stator indirectly controlling the
field generated by the main rotor by means of the
sequence exciter rotor - diode bridge - main rotor.
The voltage regulator controls and keeps constant the
average voltage of one phase. The voltage setting on the
AVR can be adjusted with the help of a trimmer
“V”
(See
par.5.3.1)
A frequency control progressively deactivates the machine
when the drive motor speed drops below a pre-set,
adjustable threshold preventing over-excitement at low
operating speeds and abating the load engage effects on
the engine.
The AVR works only within limits of the set frequency 50
Hz. When operating below the lower limit of 46 Hz ± 1 Hz
the AVR will stop regulating to avoid overloading the
exciter coil. When applying the generator set at 60 Hz the
AVR is re-adjustable as well. To operate at 60 Hz the
engine RPM and Digital Diesel Control settings must also
be changed. For the USA market a dedicated manual is
available for 60 Hz applications. Please refer to the
Mastervolt service centre for specific instructions to
convert the generating set to 60 Hz.
It is not possible to take off the full power from the Whisper
12 ULTRA Three Phase by reconnecting the alternator to
