Generac Power Systems 005342-6 Owner'S Manual Download Page 7

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EQUIPMENT DESCRIPTION

This equipment is a revolving field, alternating current Stationary

Emergency Generator. The generator was designed to supply elec-

trical 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 Stationary Emergency Generator incorporates the following

alternator 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.

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’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.

LOW FUEL PRESSURE SWITCH

This normally closed (N.C.) switch is held open by fuel pressure

during operation. If fuel pressure drops below a safe level, the

switch contacts close, automatically shutting 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 pre-specified 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.

FUEL SYSTEM

FUEL REQUIREMENTS

The Stationary Emergency Generator may be equipped with one of

the following fuel systems:
• Diesel fuel system
•  Liquid propane (LP) fuel system
•  Propane vapor (PV) fuel system
•  Natural gas fuel system
•  Combination LP/natural gas fuel system
The data card that is affixed to the unit includes the “Identification

Code,” which may be used to identify the type of fuel system

installed on the unit.

General Information