Guardian Technologies 005282 - Manual (Page 20)

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Low speed exercise will be handled as follows:
1. The standard start sequence will be initiated.
2. The unit will run at 2,400 RPM.
3. If utility is lost during exercise, the controller will
do the following:
• Wait 10 seconds for utility to return.
• If utility returns within 10 seconds, continue to
exercise at 2,400 RPM.
• If utility is still lost after 10 seconds, run the
engine up to 3600 RPM and transfer the load.
At this time the controller will exit the exercise
routine and assume full automatic operation.
3.6 PROTECTION SYSTEMS
3.6.1 LOW OIL PRESSURE SWITCH
This switch (Figure 3.3) has normally closed con-
tacts that are held open by engine oil pressure dur-
ing cranking and operating. Should oil pressure
drop below the 8 psi range, switch contacts close,
and the engine shuts down. The unit should not be
restarted until oil is added. The AUTO/OFF/MANUAL
switch must then be turned to OFF and then back to
AUTO.
3.6.2 HIGH TEMPERATURE SWITCH
This switch’s contacts (Figure 3.3) close if the tem-
perature should exceed approximately 140º C (284º
F), initiating an engine shutdown. The generator will
automatically restart and the LED on the generator
control panel will reset once the temperature has
returned to a safe operating level.
Figure 3.3 – Low Oil Pressure and
High Temperature Switches
Oil Filter
Oil
Drain
Hose
Low Oil Switch High Temp Switch
Loose
n
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3.6.3 OVERCRANK
This feature prevents the generator from damaging
itself when it continually attempts to start and anoth-
er problem, such as no fuel supply, prevents it from
starting. The unit will crank and rest for a preset
time limit. Then, it will stop cranking, and the LED
on the generator control panel will light indicating an
overcrank failure. The AUTO/OFF/MANUAL switch
will need to be set to OFF and then back to AUTO to
reset the generator control board.
NOTE:
If the fault is not repaired, the overcrank feature
will continue to activate.
3.7.3.1 Approximate Crank Cycle Times
7kW Units:
15 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
7 seconds ON
If the unit fails to start, the overcrank alarm LED will
be illuminated.
10kW, 13kW and 16kW Units:
16 seconds ON
7 seconds OFF
16 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
7 seconds ON
7 seconds OFF
If the unit fails to start, the overcrank alarm LED will
be illuminated.
3.6.4 OVERSPEED
This feature protects the generator from damage by
shutting it down if it happens to run faster than the
preset limit. This protection also prevents the gen-
erator from supplying an output that could poten-
tially damage appliances connected to the generator
circuit. Contact the nearest Authorized Dealer if this
failure occurs.
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Section 3 — Operation
Air-cooled Generators