Eaton Cooper Power NR Series Maintenance Instructions Manual

Contents

MaintenanceFrequency of maintenanceThese switches are applied under widely varying operatingand climatic conditions, therefore, maintenance intervalsare best determined by the user based on actual operatingexperience. To assure proper operation, switches mustbe maintained when they have performed the equivalentof a complete operating duty cycle and before thedielectric strength has deteriorated below prescribedlevels. In the absence of specific operating experience,Eaton recommends the switch be inspected and servicedevery 1200 operations or three years, whichever comesfirst. In no case should the service interval, betweenperiodic maintenance and inspection, extend beyond 1200operations.Periodic maintenance inspectionEach periodic maintenance inspection should include atleast the following:1. By-pass and remove the switch from service.2. Inspect external components.A. Clean the bushings and inspect for chips, cracksand breaks. Replace as necessary, following proce-dure in "Shop Repair Procedures—Bushings" sec-tion.B. Check for paint scratches and other mechanicaldamage. Paint to inhibit corrosion.3. Perform a dielectric withstand test to determine theinsulation level. Follow procedures in "Insulation LevelWithstand Tests" section.4. Loosen the head bolts and remove the mechanismfrom the tank. Be careful not to damage the gasketif the tank and head must be pried apart to break theseal.5. Allow the oil to drain off the mechanism.TerminalsStationaryContactsActuatorHousingHeadCastingCover--ClampedBushingsLiftingStrapMoving ContactsContactStructureOperatingLeverSleetHoodFigure 1. Untanked Type NR oil switch.Operating Shaft Drive LeverElastic Stop NutDrive LeverTerminal Strip ForCustomer ConnectionsDrive MotorSelector SwitchClosing SpringFigure 2. Standard actuator mechanism with auxiliaryswitch option.5 Pin / 3 Conductor Or6 Pin / 6 ConductorReceptacleWhite Motor Lead ToTerminal GRed Selector SwitchLead To Terminal 2Black SelectorSwitch Lead ToTerminal 3PinCAUTIONThis equipment requires routine inspection andmaintenance to ensure proper operation If it is notmaintained, it can fail to operate properly. Improperoperation can cause equipment damage and possiblepersonal injury. G105.13TYPE NR OIL SWITCH MAINTENANCE INSTRUCTIONS MN230001EN February 2016