Section 3 - Operation; Control Console Components - Generac Power Systems 004920-0 Owner's Manual

3.1 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
3.1.1 AC VOLTMETER
The voltmeter displays generator AC output voltage
during operation. Voltage is regulated by a solid state
voltage regulator and is proportional to AC frequen-
cy. Refer to the unit's DATA PLATE for rated AC volt-
age.
3.1.2 AC AMMETER
The ammeter indicates current draw of connected
electrical loads during operation. DO NOT EXCEED
THE UNIT'S RATED MAXIMUM CONTINUOUS CUR-
RENT. Refer to the unit DATA PLATE.
3.1.3 AC FREQUENCY METER
The 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 Hertz at 3600 rpm. 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
alternator, which maintains battery state of charge
when the engine operates. The Control PCB 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 dis-
charging.
14 Generac ® Power Systems, Inc.
Section 3 — Operation
Generac Liquid-cooled 20 kW Generator
15
3.1.5 METER READING SELECTOR SWITCH
This switch allows selection of either line-to-line or
line-to-neutral voltage and amperage readings on the
console AC voltmeter and ammeter.
3.1.6 HOURMETER
Indicates time the engine-generator has operated, in
hours and tenths of hours. Use the hourmeter along
with the periodic maintenance schedule for the gen-
erator set.
3.1.7 AUTO/OFF/MANUAL SWITCH
Use this three-position switch as follows:
• Set the switch to AUTO for fully automatic opera-
tion. See "Automatic Operation".
• Set switch to MANUAL position to crank and start
the generator engine.
• Set switch to OFF position to shut down an oper-
ating engine. With OFF selected, operation will not
be possible.
DANGER
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 OPER-
ATE tag on control console.
3.1.8 FAULT INDICATOR LAMP
This lamp goes ON when one or more of the follow-
ing engine faults occurs and when engine shuts down.
• Low oil pressure
• High coolant temperature
• Low coolant level
3.1.9 15 AMP FUSE
This 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. If the fuse needs to be
replaced, use only an identical 15-amp replacement
fuse. (Type AGC)
3.1.10 7.5 AMP INLINE FUSE
This inline fuse is connected in the 15E line that runs
between the AUTO/OFF/MANUAL switch and position
11 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. This fuse is an inline fuse
holder that is part of the control panel harness.
• Overcrank
• Overspeed