Generac Power Systems 5255 User Manual

  

19

During cranking, if the board does not see a valid 
RPM signal within three (3) seconds, it will shut 
down and latch out on RPM sensor loss.

During running, if the RPM signal is lost for one full 
second the board will shut down the engine, wait 15 
seconds, then re-crank the engine.

If an RPM signal is not detected within the first 

three (3) seconds of cranking, the control board 
will shut the engine down and latch out on RPM 
sensor loss.

If the RPM signal is detected the engine will start 

and run normally. If the RPM signal is subsequent-
ly lost again, the control board will try one more 
re-crank attempt before latching out and flashing 
the overspeed LED.

The microprocessor will continually monitor the 
battery voltage and turn on the Low Battery LED if 
the battery voltage falls below 11.0 volts for one (1) 
minute. No other action is taken on a low battery 
condition. Low battery voltage is a non-latching alarm 
which will automatically clear if the battery voltage 
rises above 11.0 volts. Battery voltage is NOT moni-
tored during the crank cycle.

The 15-amp fuse on the generator panel protects the 
DC control circuit against overload (Figure 4.1). This 
fuse is wired in series with the battery output lead 
to the panel. If this fuse element has melted open, 
the engine will not be able to crank or start. Replace 
this fuse using only an identical 15-amp replacement 
fuse. To replace the fuse, push the fuse holder cap 
down and rotate it counterclockwise. Whenever the 
fuse is removed or replaced, the exercise timer needs 
to be reset.

OFF

EXERCISE

SYSTEM FUSE

15A

ASSY: 0F8418/0F8419

SET

TIME

AUTO.

MAN.

NO UTILITY SENSE
5 FLASHING RED LEDS=
EXERCISER NOT SET

FLASHING GREEN LED=

SYSTEM SET

NO RPM SENSE IF FLASHING

OVER SPEED

CONTROL AND INFORMATION CENTER

LOW BATTERY

LOW OIL

HIGH TEMP

OVER CRANK

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•

•

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For oil capacities, see the Specifications section. 
For engine oil recommendations, see the Engine Oil 
Recommendations section. To check the engine oil 
level, proceed as follows (Figures 4.2, 4.3 and 4.4):

1.  Move the AUTO/OFF/ MANUAL switch to the OFF 

position.

2.  Remove the dipstick and wipe it dry with a clean 

cloth.

3.  Completely insert the dipstick; then, remove it 

again. The oil level should be at the dipstick “Full” 
mark. If necessary, add oil to the “Full” mark 
only. DO NOT FILL ABOVE THE “FULL” MARK.



4. Install 

the 

dipstick.

5.  Reset the AUTO/OFF/MANUAL switch to its origi-

nal position.