standby generator owner's manual - Zabatt

Standby Generator SetsEngine Protective DevicesENGINE PROTECTIVE DEVICESThe standby generator may be required to operate forlong periods of time without an operator on hand tomonitor such engine conditions as coolant temperature,oil pressure or rpm. For that reason, the enginehas several devices designed to protect it againstpotentially damaging conditions by automaticallyshutting down the unit when the oil pressure is toolow, the coolant temperature is too high, the coolantlevel is too low, or the engine is running too fast.NOTE:Engine protective switches and sensors are mentionedhere for the reader’s convenience. Alsorefer to the applicable control panel manual foradditional automatic engine shutdown information. HIGH COOLANT TEMPERATURE SWITCHThis switches contacts close if the temperature shouldexceed approximately 140° C (284° F), initiating anengine shutdown. The generator will automaticallyrestart and the LED will reset once the temperaturehas returned to a safe operating level. LOW COOLANT LEVEL SENSORShould the engine coolant level drop below the levelof the high coolant temperature switch, it is possiblefor the engine to overheat without automatic shutdown.To prevent such overheating, the engine has alow coolant level sensor. If the level of engine coolantdrops below the level of the low coolant level sensor,the engine automatically shuts down. LOW OIL PRESSURE SWITCHThis switch has normally closed contacts that areheld open by engine oil pressure during cranking andoperating. Should oil pressure drop below the 8 psirange, switch contacts close, and the engine shutsdown. The unit should not be restarted until oil isadded, and the AUTO/OFF/MANUAL switch must beturned to OFF and then back to AUTO.OVERCRANK SHUTDOWNAfter a prespecified duration of cranking, this functionends the cranking if the engine has failed tostart. The overcrank LED will turn ON. Turn OFF theAUTO/OFF/MANUAL switch, then turn switch back toAUTO to reset the generator control board.NOTE:If the fault is not corrected, the overcrank featurewill continue to activate.Approximate Crank Cycle Times• 15 seconds ON• 7 seconds OFF• 7 seconds ON• 7 seconds OFF• Repeat for 45 secondsApproximately 90 seconds total. OVERSPEED SHUTDOWNA speed circuit controls engine cranking, start-up,operation and shutdown. Engine speed signals aredelivered to the circuit board whenever the unit isrunning. Should the engine overspeed above a safe,preset value, the circuit board initiates an automaticengine shutdown. Contact the nearest AuthorizedDealer if this failure occurs. RPM SENSOR LOSS SHUTDOWNIf the speed signal to the control panel is lost, engineshutdown will occur. DC FUSEThis fuse is located inside of the control panel. Itprotects the panel wiring and components fromdamaging overload. Always remove this fuse beforecommencing work on the generator. The unit willnot start or crank if the fuse is blown. Replace thefuse with one of the same size, type, and rating. (Seethe exploded views and parts lists at the end of thismanual for replacement part number.)4-1EngProt001 Rev. 0 08/05