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General Information
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 connection box, lists the unit's serial number
and its rated voltage, amps, wattage capacity, phase, frequency,
rpm, power factor, etc.
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.
Groups and Assembly Numbers
The data label lists the groups and corresponding assembly
numbers for each unit. The assembly numbers refer to exploded
view drawing numbers that are applicable to the specific genera-
tor 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 opera-
tion 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. 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 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.
4
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 condi-
tions as coolant temperature, 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 mentioned here for
the reader's convenience. Also refer to the applicable control
panel manual for additional automatic engine shutdown infor-
mation.
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 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 engine
automatically shuts down.
1.3.3 OIL PRESSURE SENSOR
This sensor monitors engine oil pressure. If oil pressure 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 dur-
ing operation. If fuel pressure drops below a safe level, the switch
contacts close, automatically 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.
1.3.6 OVERCRANK SHUTDOWN
After a prespecified duration of cranking, this function ends the
cranking if the engine has failed to start.
1.3.7 RPM SENSOR LOSS SHUTDOWN
If the speed signal to the control panel is lost, engine shutdown
will occur.
NOTE:
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