Groups and Assembly Numbers
The XPL 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 gen- erator model. These drawings are located in the back half of this manual.
Voltage Codes
The identification code letter following the unit'skilowatt rating is the generator's"voltage code." Anyone of the following voltage codes may be listed.
A - 120/240 volts,
o- 120/240 volts, single- and
J 120/240 volts,
L 346/600 volts,
N - 115/200 volts,
S 277/480 volts,
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
The generator'srevolving 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'sfeatures.
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
•The generator is
•The voltage waveform deviation, total harmonic content of the AC waveform and "telephone influence factor" have been evaluated and are acceptable according to NEMA
•All prototype tested models have passed
General Information
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 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.
NOTE:
Engine protective switches and sensors are mentioned here for the reader'sconvenience. 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 alow 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,
OVERCRANK SHUTOOWN
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.
DC FUSES
These fuses are located inside the front panel of the control sys- tem. They protect the panel wiring and components from damag- ing overload.
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