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General Information
IDENTIFICATION RECORD
DATA LABEL
Every generator set has a DATA LABEL that contains important
information pertinent to the generator (Figure 1.1). The data label,
which can be found attached to the generator's lower connection
box, lists the unit's serial number and its rated voltage, amps, watt-
age capacity, phase, frequency, rpm, power factor, etc.
Figure 1.1 — Data Label
The above is a generic representation of a data 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 labels 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. 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 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.
4
NOTE:
• All prototype tested models have passed three-phase sym-
metrical short circuit test to ensure system protection and
reliability.
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.
COOLANT TEMPERATURE SENDER
This sender 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 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.
OIL PRESSURE SENDER
This sender 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 circuit board
whenever the unit is running. Should the engine overspeed above
a safe, preset value, the circuit board initiates an automatic engine
shutdown.
OVERCRANK SHUTDOWN
After a prespecified duration of cranking, this function ends the
cranking if the engine has failed to start.
RPM SENSOR LOSS SHUTDOWN
If the speed signal to the control panel is lost, engine shutdown
will occur.
NOTE:
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