Description - Onan DYG Series Operator's Manual And Parts Catalog

DESCRIPTION
G E N E R A L
An Onan DYG series electric generating set is a
complete unit consisting, of an engine driven AC
generator, with controls and accessories as ordered.
E N G I N E
The "engine on the DYG is an Allis-Chalmers
17000MK I I as described in theengine manual. Basic
measurements and requirements will be found under
Specifications. However, the engine used for your
unit may have variations due to optional equipment
available, therefore the Allis-Chalmers manual
should be consulted.
A C G E N E R A T O R
The generator is an Onan Type UR (150 & 175 kW) or
YB (200 kW). It is a 12 lead, 4 pole revolving field,
reconnectible brushless unit. Alternating current is
generated in the stator winding. The alternator rotor,
attached directly to the engine flywheel turns at
engine speed. Therefore, thespeed at which the rotor
turns, determinesgeneratoroutputfrequency. The60
hertz set operates at 1800 rpm and the 50 hertz at 1500
rpm. Excitation is achieved by feeding AC output to a
voltage regulator, where it is compared with a
reference voltage, rectified and returned to the field of
the exciter. Current induced in the exciter rotor is
rectified and fed to the generator rotor. This induces a
current in the generator stator which is applied to
load. The generator is available in 3-phase and single
phase. Excitation and regulation are the same for
either unit.
Run-Stop/Reset-Remote Switch: Starts and stops the
unit locally or from a remote location. Resets engine
monitor relay in Stop/Reset position.
Warning Light: Indicates "Fault" in engine operation.
AC Panel
AC Voltmeter Indicates AC generator output voltage.
Dual range instrument: measurement range in use
shown on indicator light.
AC Ammeter: Indicates AC generator output current.
Dual range in use shown on indicator lights.
Voltmeter-Ammeter Phase Selector Switch: Selects
the phases of the generator output to be measured by
the AC voltmeter and AC ammeter.
Voltage Regulator: Rheostat, provides approximately
plus or minus 5% adjustment of the rated output
voltage.
Exciter Circuit Breaker: Provides generator exciter
and regulator protection from overheating in the
event of certain failure modes of the generator,
exciter and voltage regulator.
Running Time Meter: Registers the total number of
hours, to 1/10th that the unit has run. Use it to keep a
record for periodic servicing. Time is accumulative,
meter cannot be reset.
Frequency Meter: Indicates the frequency of the
generator output in hertz. It can be used to check
engine speed. (Each hertz equals 30 rpm.)
C O N T R O L PANEL
The following is a brief description of each of the
standard controls and instruments located on the
face of the panel. See Figure 1 and 3.
D C Panel
Oil Pressure Gauge: Indicates pressure of lubricating
oil in engine (wired to a sensor unit located on the
engine).
Water Temperature Gauge: Indicates temperature of
circulating coolant in engine. (Wired to a sensor unit
located on the engine.)
Battery Charge Rate DC Ammeter: Indicates battery
charging current.
OPTIONAL EQUIPMENT
D C Panel
Warning Lights: Eliminates the one "Fault" light and
substitutes five indicator lights to give warning of—
a. Overcrank
b. Overspeed
c. Low oil pressure
d. High engine temperature
e. Low engine temperature
Operation of these lights will be discussed in con-
junction with engine monitor panel.
Reset Switch: Manual reset for engine monitor after
shut-down.
Lamp Test: Press to test warning lamp bulbs (when
engine is running only).