INFORMATION
12
Copyright © 2008 Mastervolt / December 2008 / WHISPER 15 ULTRA - Three Phase / US
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, 12 wire, four
pole (1800 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).
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”
between 100 and 140 Volts (or 200 and 280V @ nominal
voltage 230V). (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 60
Hz. When operating below the lower limit of 56 Hz ± 1 Hz
the AVR will stop regulating to avoid overloading the
exciter coil (This setting can be changed with trimmer
“UF”
). (See par.5.3.1)
When applying the generator set at 50 Hz the AVR is re-
adjustable as well. To operate at 50 Hz the engine RPM
and Digital Diesel Control settings must also be changed.
For the European market a dedicated manual (Art. No
50200341) is available for 50 Hz applications. Please refer
to the Mastervolt service centre for specific instructions to
convert the generating set to 50 Hz.
A further option is to readjust the stability of the regulator.
In the event of very irregular (alternating) loads it could be
necessary to change this setting with the help of trimmer
“S”
to avoid interference of the regulator and the
alternating load. In conclusion the regulator reaction time
can be modulated to eliminate any voltage instability that
may arise. (See par.5.3.1)
Fig. 10 Automatic Voltage Regulator (AVR).