Generator Control Panel; Remote Control Panel; Technical Information; Ac Alternator - Whisper Power m-sq25 User Manual

INFORMATION
2.4.2

Generator control panel

Internal fuel pump Digital Diesel Control
Fuse 3A Fuse 3A
Remove fuse
before maintenance
Auxiliary External Fuel Pump
Fuse 10A Fuse 3A
Fig. 8 Control panel.
Fig. 9 Digital Diesel Control unit
2.4.3

Remote control panel

1 2
5
01 Generator load indicator
02 Failure LED
03 Start button
04 Stop button
05 Display
06 Select button
07 Set button
Fig. 10 Digital Diesel remote control panel.
12
Start / Stop
Whisper Digital Diesel Operation Unit
Observe instructions in the manual
Replace fuses with same type and rating
3 4
7 6
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 (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).
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 185 and 290 Volts. (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 (This setting can be changed with trimmer
"UF"). (See par. 5.3.1)
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 (Art. No
50200444) is available for 60 Hz applications. Please refer
to the WhisperPower
instructions to convert the generating set to 60 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. 11 Automatic Voltage Regulator (AVR).
service centre for specific
November 2010 / M-SQ20 / 25 / EN