Panel Light; Voltage Adjust Dial; Phase Selection Switch; Engine Protective Devices - Generac Power Systems GR-210 Operation And Maintenance Manual

PANEL LIGHT

The panel light will turn on when the unit is running or
cranking.

VOLTAGE ADJUST DIAL

This potentiometer permits the operator to select the
desired output voltage from the alternator. Turning the
voltage adjust dial counterclockwise decreases the volt-
age and allows operation of loads down to 120/208 volts
AC and 240/416 volts AC and a little below.
Turning the dial clockwise, the unit can operate up to
139/240 volts and 277/480 volts AC and slightly higher
loads. The generator can power any load with voltage
between these two extremes including 127/220 volts AC
near the center of the dial.
Note: The voltage indicated on the voltage adjust
dial is line-to-line voltage (See description of
"Voltage Code X" on page 4).
CAUTION! Voltage adjust dial affects all recepta-
cles at the same time.
All receptacles and terminals are available at all
times and can be loaded at the same time. MAXI-
MUM TOTAL LOAD must not exceed generator rat-
ing. Maximum load for single-phase or three-
phase operation must not exceed the rating for
that particular mode of operation (rating for sin-
gle-phase may be less than for three-phase opera-
tion). The total load connected to any phase,
including loads connected to receptacles, must
not exceed the rated generator output per phase.

PHASE SELECTION SWITCH

This switch permits selection between the phases for
which the line-to-line voltage and amperage readings
are displayed on the console AC voltmeter and amme-
ter.

ENGINE PROTECTIVE DEVICES

Unlike an automobile, the generator may be required to
run for long periods without an operator nearby to
monitor engine parameters (oil pressure, temperature,
engine speed, low coolant level etc.). For that reason, the
unit is equipped with various protective devices which
will stop the engine automatically if an operational fault
occurs.

LOW OIL PRESSURE SWITCH

This normally-closed, pressure actuated switch (Figure
12) is held open by engine oil pressure during running.
Should engine oil pressure drop below about 10 PSI,
the switch contacts will close. When contacts close, the
engine automatically shuts down and the fault indicator
lamp goes ON.
12 Generac Power Systems, Inc.
®
Operation
GR-210 Generator Set
NOTE:
Figure 12 - Low Oil Pressure Switch
HIGH COOLANT TEMPERATURE
SWITCH
This thermostatic, normally-open switch (Figure 13), is
immersed in engine coolant. Should coolant tempera-
ture increase above about 250°F , the switch contacts
close and an automatic shutdown occurs.
Figure 13 - High Coolant Temperature Switch

LOW COOLANT LEVEL SENSOR

If engine coolant level is low, a high temperature condi-
tion can exist without affecting the high coolant temper-
ature switch. However, the low coolant level sensor
(Figure 14) will detect the low level condition and initi-
ate an engine shutdown.
Figure 14 - Low Coolant Level Sensor