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6 Generac
®
Power Systems, Inc.
Figure 1.6 - Low Coolant Level Sensor
1.7.4 OVERSPEED SHUTDOWN
The Pre-pack circuit board on liquid cooled units
receives AC frequency (rpm) signals directly from the
stator AC power windings, via sensing leads S15 and
S16. Should AC frequency exceed about 72 Hz, cir-
cuit board action will automatically shutdown the
engine (Figure 1.7).
*Rated power of generator is subject to and limit-
ed by such factors as ambient temperature, alti-
tude, engine condition, and other factors. Engine
power will decrease about 3.5% for each 1000 feet
above sea level and will decrease an additional 1%
for each 10°F above 60°F. Maximum output power
of the generator is limited by maximum engine
power.
Figure 1.7 - Control Module Assembly
Circuit Board
1.7.5 PCB OPERATION LED’S
• LED 1 is RED. The LED is on when utility sensing
is NOT available to the circuit board. This LED will
function only when the Auto/Off/Manual switch is
set in the Auto position.
• LED 2 is YELLOW. This LED is on when the circuit
board battery charger is on. This LED will cycle on
and off with the battery charger, 4.85 hours on the
4.85 hours off.
• LED 3 is GREEN. This LED will flash when the cir-
cuit board has load voltage available to it. This
LED will function when voltage is available across
T1 and T2.
1.7.6 OVERCRANK SHUTDOWN
After 90 seconds of crank-rest cycles, this function
ends cranking if the engine fails to start in that
90-second span.
1.7.6 DC FUSE
This clearly labeled fuse is located on the front panel
of the control system. It protects the panel wiring and
components from damaging overload. Always
remove this fuse before commencing work on the
generator. The unit will not start or crank if the fuse
is blown. Replace the fuse with one of the same size,
type, and rating. Generac normally uses an AGC fuse
rated at 15 amps (part number 022676).
1.8 UNPACKING
1.8.1 UNPACKING PRECAUTIONS
Handle shipping cartons and crates with care. Use
care to avoid damage from dropping, bumping, colli-
sion, etc. Store and unpack cartons with the proper
side up, as noted on the shipping carton.
1.8.2 INSPECTION
After unpacking, carefully inspect the generator for
any damage that may have occurred during ship-
ment. If loss or damage is noted at the time of deliv-
ery, have the person(s) making delivery note all dam-
age on the freight bill or affix their signature under
the consignor’s memo of loss or damage.
1.9 LIFTING THE GENERATOR
When lifting or hoisting equipment is used,
be careful not to touch overhead power lines.
The generators weight of more than 900
pounds requires proper tools, equipment, and
qualified personnel to be used in all phases of
handling and unpacking.
!
A
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2002 GENERAC POWER SYSTEMS
,
ASSY #076009
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Section 1 — General Information
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators