Generac Power Systems 004812-3 Page 6 Owner'S Manual Download

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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, which can be found 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.

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 card 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 generator or to the data
card 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 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.

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.

NOTE:

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

HIGH COOLANT TEMPERATURE
SWITCH

This normally open (N.O.) switch closes to automati-
cally shut down the engine if the engine coolant tem-
perature 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 LOW OIL PRESSURE SWITCH

This normally closed (N.C.) switch is held open by
engine oil pressure during operation. If oil pressure
drops below a safe level, the switch contacts close,
automatically shutting down the engine.

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.

Section 1 – General Information

Standby Generator Sets