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12 Generac
®
Power Systems, Inc.
3.1 CONTROL CONSOLE COMPONENTS
The components of a liquid-cooled generator control
console (Figure 3.1) are as follows:
Figure 3.1 – Control Console
3.1.1 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 the unit’s DATA PLATE for rated AC voltage.
3.1.2 AC AMMETER
This indicates current draw of connected electrical
loads during operation. DO NOT EXCEED THE UNIT’S
RATED MAXIMUM CONTINUOUS CURRENT. Refer to
the unit DATA PLATE.
3.1.3 AC FREQUENCY METER
This indicates generator AC output frequency in Hertz
(cycles per second). Frequency is proportional to engine
speed. Units with a four-pole rotor, supply 60 Hertz at
1,800 rpm. The frequency reading with no electrical
loads connected (no-load condition) should be between
60-62 Hertz.
3.1.4 DC VOLTMETER
The generator is equipped with a belt-driven DC alter-
nator, which maintains battery state of charge when the
engine operates. The control module assembly (CMA)
also incorporates a trickle charge circuit that maintains
battery state of charge during nonoperating periods.
Battery voltage should read approximately12.5 to 14.5
volts DC. A low battery voltage indicates the battery is
discharging.
3.1.5 HOURMETER
This indicates the time the engine-generator has operat-
ed, in hours and tenths of hours. Use the hourmeter
along with the periodic maintenance schedule for the
generator set.
3.1.6 AUTO/OFF/MANUAL SWITCH
See Section 3.2.
3.1.7 FAULT INDICATOR LAMP
This lamp goes ON when one or more of the following
engine faults occurs and when engine shuts down.
• Low oil pressure • High coolant temperature
• Low coolant level • Overcrank
• Overspeed
3.1.8 15-AMP FUSE
This fuse protects the control console’s DC control cir-
cuit against electrical overload. If the fuse has melted
open because of an overload, engine cranking and start-
up cannot occur. Replace the fuse with an identical AGC
15-amp replacement fuse.
3.1.9 7.5 AMP INLINE FUSE (NOT SHOWN)
This inline fuse is connected in the 15A line that runs
between the AUTO/OFF/MANUAL switch and position
10 of the 076009A 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.
3.1.10 VOLTAGE-PHASE SELECTOR SWITCH
This switch permits selection between either line-to-line
or line-to-neutral voltage and amperage readings on the
console AC voltmeter and AC ammeter.
3.1.11 SET EXERCISE TIME SWITCH
This switch allows to program the generator to start and
exercise automatically. (See Section 3.6)
3.2 USING THE AUTO/OFF/MANUAL
SWITCH
3.2.1 “AUTO” POSITION
Selecting this switch position activates fully automatic
system operation. It also allows the unit to start and
exercise the engine every seven days with the setting of
the exercise timer.
15
Section 3 — Operation
Guardian Liquid-cooled 40 kW Generator