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12 Generac
®
Power Systems, Inc.
CONTROL CONSOLE COMPONENTS
The components of a liquid-cooled generator control
console (Figure 3.1) are as follows:
Figure 3.1 - Liquid-Cooled Generator Panel
AC VOLTMETER
The voltmeter displays generator AC output voltage dur-
ing operation. Voltage is regulated by a solid state volt-
age regulator and is proportional to AC frequency. Refer
to your unit’s DATA PLATE for rated AC voltage.
AC AMMETER
Indicated current draw of connected electrical loads
during operation. DO NOT EXCEED YOUR UNIT’S
RATED MAXIMUM CONTINUOUS CURRENT. Refer to
the unit DATA PLATE.
AC FREQUENCY METER
Indicates generator AC output frequency in “Hertz”
(cycles per second). Frequency is proportional to engine
speed. Units with a 4-pole rotor supplies 60 Hertz at
1800 rpm. Units with a 2-pole rotor supplies 60 Hz at
3600 rpm. Frequency reading with no electrical loads
connected (no-load condition) should be between 60-62
Hertz.
DC VOLTMETER
The generator is equipped with a belt-driven DC
alternator, which maintains battery state of charge when
the engine operates. The Control Module Assembly also
incorporates a trickle charge circuit which maintains
battery state of charge during non-operating periods.
Battery voltage should read about 12.5 to 14.5 volts DC.
A low battery voltage indicates the battery is
discharging.
HOURMETER
Indicates time the engine-generator has operated, in
hours and tenths of hours. Use the hourmeter along
with the periodic maintenance schedule for your gener-
ator set.
AUTO/OFF/MANUAL SWITCH
Use this 3-position switch as follows:
• Set the switch to “Auto” for fully automatic operation.
See “Automatic Operation”.
• Set switch to “Manual” position to crank and start the
generator engine.
• Set switch to “Off” position to shut down an operat-
ing engine. With “Off” selected, operation will not be
possible.
With switch set to "auto", engine can crank and
start suddenly without warning. Such automatic
start up normally occurs when utility source
voltage drops below a pre-set level. To prevent
possible injury that might be caused by such
sudden starts, set AUTO/OFF/MANUAL switch to
"off" before working on or around the unit.
Then, place a "do not operate" tag on control
console.
FAULT INDICATOR LAMP
Lamp goes ON when one or more of the following
engine faults occurs and when engine shuts down.
• Low oil pressure • Overcrank
• High coolant temperature • Overspeed
• Low coolant level
30 AMP FUSE
Fuse protects the control console’s DC control circuit
against electrical overload. If the fuse has melted open
because of an overload, engine cranking and startup
cannot occur. Should you need to replace the fuse, use
only an identical 30-amp replacement fuse. (Type AGC)
7.5 AMP INLINE FUSE
This inline fuse is connected in the 15A line that runs
between the Auto/Off/Manual switch and position 10 of
the 76009A PCB. This fuse protects the start, fuel, field
boost, and transfer outputs from the PCB and will open
if there is excessive current draw on any one of these
outputs.
30 AMP
FUSE
Section 3 — Operation
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators