Standby Electric SetsMost standby units are automatic. They start, pick upthe load, run and stop without an operator in attendance.Standby units can not change the governor controlsetting automatically. The governor control must bepresetfor the proper operation of that unit. Whenever the set isexercised or operated manually, be sure the governorspeed setting is correct for automatic operation. Checkall switches to see they are properly set: Start SelectorSwitch in AUTOMATIC position and any EmergencyStop Switches in RUN position.Generator StorageStorage ProcedureWhen a generator is in storage for any length of time,moisture condenses in the windings. Minimize thecondensation by use of a dry storage space and spaceheaters.If a brush-type generator (SRCR) is to be in storage for ayear or more, lift the brushes off the slip ring to preventdamage to the slip ring by chemical action.After StorageNOTE: Test the main stator windings with a megohmmeter in the following situations:1. Before initial startup of generator set.2. Every 3 months* if generator is operating in a humidenvironment.3. If generator has not been run under load for 3months* or more.The megohmmeter test is described in Service ManualsSENR2180 or SENR7968. A reading of 1 meghom orless indicates that the winding has absorbed too muchmoisture.To remove moisture caused by high humidity, use one ofthe following methods to make the generator dry:1. Energize space heaters in generator if so equipped.2. Put the generator in an oven at a temperature of notmore than 85C (185°F) for four hours.CAUTIONIf an oven is used for drying, use aforced air type rather than a radianttype. Radiant ovens can causelocalized overheating.3. Space heaters of the same type used in marineapplications, can be installed on generators. (See theParts Book.) These heaters heat the windings to removemoisture and should be connected at all times in highhumidity conditions whenever the generator is notrunning.4. Use a canvas enclosure around the generator andheating lamps to increase the temperature. Make anopening in the top for release of moisture.5. Send a low voltage current through the windings toincrease the temperature of the windings. Do notexceed 85°C (185F).If the megohmmeter test reads under 1 megohm afterthe drying or if it goes below 1 megohm shortly afterdrying, contact your Caterpillar dealer. The insulationhas deteriorated and should be reconditioned.*This is a guideline only. It may be necessary to meggermore frequently if environment is extremely humid, saltyor if the last megger test was close to 1 megohm.20
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