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1.1
IDENTIFICATION RECORD
1.1.1 DATA LABEL
Every generator set has a DATA LABEL that contains
important information pertinent to the generator. The
data label, attached to the generator's lower connec-
tion box, lists the unit's serial number and its rated
voltage, amps, wattage capacity, phase, frequency,
rpm, power factor, etc.
1.1.1.1 Generator Model Number
This number is the key to numerous engineering and
manufacturing details pertaining to the unit. Always
supply this number when requesting service, order-
ing parts or seeking information.
1.1.1.2 Groups and Assembly Numbers
The data label lists the groups and corresponding
assembly numbers for each unit. The assembly num-
bers refer to exploded view drawing numbers that
are applicable to the specific generator model. These
drawings are located in the back of this manual.
1.2
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 elec-
trical 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.
Generators with a four-pole rotor are driven at rated
speeds of 1,800 rpm to supply a frequency of 60
Hertz.
Refer to the data label on the specific generator or to
the data label affixed to the unit for rated AC voltage,
wattage, amperage, number of phases, etc.
1.2.1 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 con-
structed.
• The voltage waveform deviation, total harmonic
content of the AC waveform and "telephone influ-
ence factor" have been evaluated and are accept-
able according to NEMA MG1-22.
• All prototype tested models have passed three-
phase symmetrical short circuit test to ensure
system protection and reliability.
4
Section 1 – General Information
Standby Generator Set
1.3
ENGINE PROTECTIVE DEVICES
The standby generator may be required to operate for
long periods of time without an operator on hand to
monitor such engine conditions as coolant tempera-
ture, oil pressure or rpm.-For that reason, the engine
has several devices designed to protect it against
potentially damaging conditions by automatically
shutting down the unit when the oil pressure is too
low, the coolant temperature is too high, the coolant
level is too low, or the engine is running too fast.
Engine protective switches and sensors are men-
tioned here for the reader's convenience. Also
refer to the applicable control panel manual for
additional automatic engine shutdown informa-
tion.
1.3.1 COOLANT TEMPERATURE SENSOR
This sensor monitors engine coolant temperature
and will shut down the generator if engaine coolant
temperature rises above a safe level.
1.3.2 LOW COOLANT LEVEL SENSOR
Should the engine coolant level drop below the level
of the high coolant temperature switch, it is possible
for the engine to overheat without automatic shut-
down. 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 engine automatically shuts down.
1.3.3 OIL PRESSURE SENSOR
This sensor monitors engine oil pressure. If oil pres-
sure drops below a safe level, the generator will shut
down automatically.
1.3.4 LOW FUEL PRESSURE SWITCH
This normally open (N.O.) switch is held open by fuel
pressure during operation. If fuel pressure drops
below a safe level, the switch contacts close, auto-
matically shutting down the engine.
1.3.5 OVERSPEED SHUTDOWN
A speed circuit controls engine cranking, start-up,
operation and shutdown. Engine speed signals are
delivered to the circuit board whenever the unit is
running. Should the engine overspeed above a safe,
preset value, the circuit board initiates an automatic
engine shutdown.
NOTE:
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