Eaton LBS Series Installation, Operation And Maintenance Manual

Contents

asymmetrical40 2061 25Page 9The elastic stop nut at the hinge end must be tightenedto a value of 20 inch-pounds on all switches.It is critical that the bolts at both ends of the main bladeassembly be properly tightened. If the bolts are over-tightened, the switch may not properly open or close. Ifthe bolts are under-tightened, the blades will not makea good electrical connection and the switch willoverheat. A resistance reading across each pole canbe used to verify that the blades are tight enough, butwill not indicate if they have been over-tightened. Ohmreadings between the top terminal pad and the bottomterminal pad on each pole should not exceed 60 micro-ohms when the bolts are tight.5.3 Replacement ProceduresWARNING!Failure to completely disconnect the switch from allpower sources prior to inspection may result insevere injury or death.The switch must be completely disconnected from allpower sources before performing inspection.5.3.1 Main Blade/Hinge Subassembly and BreakJaw ReplacementBegin with the switch should be in the closed position.Disconnect the drive rod link from the clevis on the mainshaft. Remove the four bolts holding the hingeassembly to the lower terminal pad. The hinge, mainblade and flicker blade assembly is now free and maybe removed, along with the lower terminal pad.Remove the two bolts holding the break jaw to theupper terminal. Remove the old jaw. Replace the jawand finger tighten the two mounting bolts. Replace themain blade and hinge assembly on top of the lowerterminal pad and finger tighten the four bolts. Align theblade per paragraph 5.2.3. Tighten the jaw and hingemounting bolts. Lubricate per Sec 5.4.Align flicker blade and arc chute per paragraph 5.2.4.Check flicker blade function per paragraph 5.1.3. Ifsatisfactory, re-connect the drive rod link to the mainshaft clevis, being sure to reinstall the clinch spacer inthe large hole in the drive rod. Check the switch foradjustments per paragraph 5.2.2 and 5.2.5. Performthe pre-operation check (see Section 3).5.3.2 Flicker Blade ReplacementRemove the locknut and bolt securing the flicker bladeassembly to the main switch blade. When re-installing,made certain that the spring is installed against the stoppin. Verify by pushing the assembly back andobserving its return to the original position.FlickerBladeFig.11 Flicker Blade Assembly5.3.2 SpringsThe main spring is a large horizontally mountedcompression spring along the inside of the switch frameon the operating handle side. For higher fault-closeratings, there is also an auxiliary spring verticallymounted and connected to the main shaft.The main and auxiliary springs are not field replaceable.5.3.3 Pre-Use CheckAfter completing any maintenance, the alignmentshould be checked (See Section 5.2.). After completingany alignment, the switch should be operated at leastthree "close-open" operations to check for properperformance. Insure that the break jaw has beenproperly lubricated per Section 5.4.5.4 LubricationLubrication is critical to the proper operation of theswitch and should be performed every 100 operationsor yearly, during switch maintenance (see Section 5).C-H conductive grease, part number 7274A48H02,should be applied moderately to contact surfaces on

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