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6 Generac
®
Power Systems, Inc.
Figure 1.5- High Coolant Temperature Switch
1.7.3 LOW COOLANT LEVEL SWITCH
Should engine coolant level drop below the level of
the high coolant temperature switch, it is possible for
the engine to overheat without automatic shutdown.
To prevent such overheating without automatic shut
down, the engine has a low coolant level sensor. If the
engine coolant drops too low, the engine
automatically shuts down (Figure 1.6).
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,
circuit board action will automatically shutdown the
engine (Figure 1.7).
Figure 1.7 - Control Module Assembly
Circuit Board
1.7.5 PCB OPERATION LED’S
• LED 1 is RED. The LED will be 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 will be 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
circuit 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,
collision, 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
shipment. If loss or damage is noted at the time of
delivery, have the person(s) making delivery note all
damage 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.
!
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2002 GENERAC POWER SYSTEMS
,
ASSY #076009
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Section 1 — General Information
Centurion Liquid-cooled 15 kW and 25 kW Generators