Equipment Description; Standard Generator Features; Engine Protective Devices; High Coolant Temperature Switch - Generac Power Systems 3190290100 Owner's Manual

EQUIPMENT DESCRIPTION

This equipment is a revolving field, alternating cur-
rent generator set. The generator was designed to
supply electrical power for the operation of compati-
ble 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
or a gearbox coupling assembly. Units with a
four-pole rotor are driven at rated speeds of 1,800
rpm to supply a frequency of 60 Hz, or at 1,500 rpm
for a frequency of 50 Hz.
Refer to the data plate on this specific generator or to
the data card affixed to the unit for rated AC voltage,
wattage, amperage, number of phases, etc. See
"Identification Code" on Page 4 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 influ-
ence factor" have been evaluated and are accept-
able according to NEMA MG1-22.
• All prototype tested
three-phase symmetrical 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 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.
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.
models have
NOTE:
Section 1 – General Information
Generac Standby Generator Sets

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.

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.

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.

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 func-
tion ends the cranking if the engine has failed
passed
to start.

RPM SENSOR LOSS SHUTDOWN

If the speed signal to the control panel is lost, engine
shutdown will occur.

FUEL SYSTEM

FUEL REQUIREMENTS

The standby 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. See Page
4.
Generac ® Power Systems, Inc. 5