Generac Power Systems SD050, Owner'S Manual

Page: 7 / 112

5
Generator Model Number
This number is the key to numerous engineering and manufactur-
ing details pertaining to the unit. Always supply this number when
requesting service, ordering parts or seeking information.
NOTE:
The XPL Label figure is a generic representation of an XPL
label. For actual information related to this particular model,
please refer to the “construction document” located at the end
of this manual, or to the data cards affixed to the unit.
EQUIPMENT DESCRIPTION
This equipment is a revolving field, alternating current generator
set. The generator was designed to supply electrical power for the
operation of compatible electrical loads-when the UTILITY power
supply is not available or has dropped to an unacceptable level.
The generator’s revolving field is directly connected to and driven
by an engine by means of flexible discs and in some models a
gearbox. Generators with a four-pole rotor are driven at rated
speeds of 1,800 rpm to supply a frequency of 60 Hertz, or 1500
rpm for 50Hz.
Refer to the data label on this specific generator or to the data label
affixed to the unit for rated AC voltage, wattage, amperage, number
of phases, etc. See “Identification Code” for an explanation of the
way to identify the unit’s features.
STANDARD GENERATOR FEATURES
This generator incorporates the following generator features:
• The rotor insulation system is Class “H” rated, and the stator
insulation is Class “H” rated as defined by NEMA MG1-22.4
and NEMA MG1-1.65.
• The generator is self-ventilated and drip-proof constructed.
• The voltage waveform deviation, total harmonic content of
the AC waveform and “telephone influence factor” have been
evaluated and are acceptable according to NEMA MG1-22.
• All prototype tested models have passed three-phase symmetri-
cal short circuit test to ensure system protection and reliability.
SINGLE-PHASE "A" CODE UNITS
For single phase units with the "A" code 390 mm alternator the
following statement applies:
This generator is suitable for supplying typical residential loads
such as: induction motors, (sump pumps, refrigerators, air con-
ditioners, furnaces, etc.) electronic components (computer, TV,
Monitor, etc...), lighting loads and microwaves.
THREE-PHASE LOAD IMBALANCE LIMITS
For three phase units the maximum load imbalance between
phases can not exceed 20% of rated load (current).
AMBIENT CONDITION DERATE
The maximum ambient temperature for the generator is indicated
on the unit data tag. De-rate values for Ambient Temperature in
excess of that indicated on the unit data tag, as well as altitude and
humidity, may apply depending on the engine and kW rating of the
unit. Consult the factory or an Authorized Service Dealer for any
de-rates applicable to this specific generator set.
ENGINE PROTECTIVE DEVICES
The stationary emergency generator may be required to operate for
long periods of time without an operator on hand to monitor such
engine conditions as coolant temperature, oil pressure or rpm. For
that reason, the engine has several sensors to provide the control
panel with information it needs to protect the engine. The control
panel is designed to shut down the engine if potentially damaging
conditions occur; for instance low oil pressure, high coolant tem-
perature, low coolant level, or engine overspeed.
NOTE:
Engine protective switches and sensors are mentioned here for
the reader’s convenience. Also refer to the applicable control
panel manual for additional automatic engine shutdown infor-
mation.
COOLANT TEMPERATURE SENSOR
This control panel automatically shuts down the engine if the
engine coolant temperature rises above a safe level.
LOW COOLANT LEVEL SENSOR
Should the engine coolant level drop below the level of the high
coolant temperature sensor, it is possible for the engine to overheat
without automatic shutdown. To prevent such overheating, the
engine has a low coolant level sensor. If the level of engine coolant
drops below the level of the low coolant level sensor, the control
panel will shut the engine down.
OIL PRESSURE SENSOR
This sensor monitors oil pressure in the engine. If oil pressure
drops below a safe level, the control system automatically shuts
down the engine.
OVERSPEED SHUTDOWN
A speed circuit controls engine cranking, start-up, operation and
shutdown. Engine speed signals are delivered to the control panel
whenever the unit is running. Should the engine overspeed above
a safe, preset value, the control panel initiates an automatic engine
shutdown.
General Information