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18 Generac
®
Power Systems, Inc.
NOTE:
Throughout the “Operation” section, differences
in procedures specific to sound attenuated units
will be denoted as follows: (SA = information).
2.1 USING THE AUTO/OFF/MANUAL
SWITCH
(FIGURE 2.1/2.2)
2.1.1 “AUTO” POSITION
Selecting this switch position activates fully automat-
ic system operation. It also allows you to start and
exercise the engine every seven days with the setting
of the exercise timer (see Section 3.10, Page 26). This
position also is used for remote starting, when it is
set up.
2.1.2 “OFF” POSITION
This switch position shuts down the engine. This
position also prevents automatic operation.
2.1.3 “MANUAL” POSITION
Set the switch to MANUAL to crank and start the
engine. Transfer to standby power will not occur
unless there is a utility failure.
With the switch set to AUTO, the engine may
crank and start at any time without warning.
Such automatic starting normally occurs when
utility power source voltage drops below a
preset level or during the normal exercise cycle.
To prevent possible injury that might be caused
by such sudden starts, always set the switch to
OFF and remove the fuse before working on or
around the generator or transfer switch. Then,
place a “Do Not Operate” tag on the generator
panel and on the transfer switch.
Figure 2.1 – Generator Control Panel
(6 kW, 8 kW, 10 kW Non-SA)
Figure 2.2 – Generator Control Panel
(Sound Attenuated)
2.2 AUTOMATIC TRANSFER
OPERATION
To select automatic operation, do the following:
1. Make sure the transfer switch main contacts are
set to their “Utility” position, i.e., loads connected
to the utility power source (Figure 2.3, Page 19).
2. Be sure that normal utility power source voltage is
available to transfer switch terminal lugs N1 and N2.
3. Set the generator’s Auto/Off/Manual switch to
AUTO.
4. Set the generator’s main circuit breaker to its ON
(or closed) position.
With the preceding steps complete, the generator will
start automatically when utility source voltage drops
below a preset level. After the unit starts, loads are
transferred to the standby power source. Refer to
“Sequence of Automatic Operation.”
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Section 2 — Operation
Guardian Air-cooled Generators