Generator Control Panel; Remote Control Panel; Technical Information; Ac Alternator - Whisper Power W-SQ-Pro User Manual

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: 7 Control panel.
Fig. 8: Digital Diesel Control unit
2.4.3

Remote control panel

01
05
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
Start / Stop
Whisper Digital Diesel Operation Unit
Observe instructions in the manual
Replace fuses with same type and rating
03
02
04
06
07
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 Whisper Power 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
W-SQ-Pro 15/10.8 Three Phase by reconnecting the
alternator to single phase (or dual voltage 60 Hz). Whisper
Power offers dedicated single phase and dual voltage 60
Hz generators.