Eaton W-SLC-7.2 Instructions For The Installation, Operation And Maintenance

Technical Data TD534-0501002UInstructions for the Installation,Operation and Maintenanceof W-SLC-7.2Effective January 2013Inspection of vacuum interrupterDuring routine inspection, check visually whether the external surfaceof vacuum interrupter is clean. If there is dirt and other items presentthen clean the bottles.Inspection of contact’s wear-outThe contactor's vacuum contacts have a very long electrical life.Usually, it only needs to be replaced after 300,000 operations.A new contactor’s over-travel is 2mm. With the contact wear theover-travel decreases. If contact wear is excessive a replacementVacuum interrupter can be installed into the contactor, It isrecommended that all 3 vacuum interrupters are replaced at thesame time. Check with the SL Contactor Operating ManualALL OPERATIONS AND MAINTENANCE WORK FOR THE W-SLC SHALL BECONDUCTED ON THE CONDITION THAT THE PRIMARY CIRCUIT IS NOTLIVE. ONCE THE DEVICE IS POWERED ON, IT CAN CAUSE DANGER SUCHAS ELECTRICAL SHOCK OR FIRE. USE PROPER VOLTAGE TRANSFORMERSOR VOLTMETERS TO TEST VOLTAGE, IN ORDER TO ENSURE THAT THEDEVICE IS NOT LIVE.DANGERWARNINGMaintenanceThe W-SLC operates on certain conditions. Its maintenance perioddepends on different factors such as surrounding environment andoperating cycles. Only experienced maintenance staff should bepermitted to conduct maintenance or inspection of the unit.Usually, the device should get a complete inspection and checkevery 50,000 operations or once a year, whichever occurs first.The W-SLC must be stored in a clean place away from dirt and othercontaminants. Vacuum cleaners or blowers should be used toremove dirt from the W-SLC.Check for any loose connections for overheating or discoloration.Check whether the insulation is damaged due to high temperature.When checking fastening pieces, the screw torque should not be toohigh as this could strip the threads. Hold each wire and pullmoderately, to check whether the wiring terminals are fastened.HIGH VOLTAGE TESTING DANGER. PAY ATTENTION TO SAFETY!Keep the contactor in open status, conduct the power frequencywithstand voltage test at 20kV maintain 1min across the open gap,phenomena such as break down and discharging is not allowed.Inspection of mechanismsFirst, make visual inspection for any loose accessories and partsincluding nuts and bolts. Then, inspect the W-SLC for any worn outor damaged parts. Rack the W-SLC in and out several times, toensure smooth operation. All the parts which need lubrication arelubricated before shipping. However if the lubricants havedegraded it may be essential to lubricate the parts during annualinspection.Usage of fusesBefore putting into use, check the fuse appearance for completeness,wellness, cleanness and correct mounting direction. The striker pinshould be facing the front of the unit.An interlocking tripping mechanism is fitted within the fuse holdercover. When only one phase fuse blows, it will cause the contactorto open. Similarly, if one phase fuse is not installed, the interlockmechanism will prevent the contactor from closing.In the event that the W-SLC experiences a 3 phase fault it may bethat only one fuse will blow due to the difference in actuation timesof each fuse and that the contactor will open when a single fuse isblown. In this case even though the two remaining fuses appear tobe in good working order, the three fuses should all be replacedtogether, due to overcurrent in the remaining fuses may havepermanently altered the tripping characteristics of the remainingfuses.Replacement of fusesAfter the W-SLC fuse operates or goes through short circuit faultcurrent, the fuse should be replaced, to make sure that the unitcan work properly. All three phase fuses should be replaced at thesame time, unless there is enough evidence indicating that faultcurrent has not gone through a certain phase fuse – in case of asingle phase fault. To replace the fuses, below procedures shouldbe followed:1. Ensure that the W-SLC cradle is in Test’ position, the contactoris in OFF status. Remove the cradle from the panel and put itinto the transfer cart;2. Use an inner hexagon spanner to remove the screws whichfasten movable fuse holder cover, see Figure 7;8EATON CORPORATION www.eaton.com4. Troubleshooting:NO. Phenomenon Causes12Not able to closeCradle not able to be racked in/out1. The contactor is already in closed status2. The cradle is not fully into the fully connected or test positions3. The firing pin in the fuse is already ejected out4. Secondary circuit of the panel is not correct1. The contactor is closed2. Cradle racking handle is not fully engaged3. Check that the shoot bolts on both sides of the front of the cradle. Make sure they are correctlyengaged in the side of the panel. If the shoot bolts are not engaged correctly then the rackinghandle will be locked and unable to turn.4. The circuit earth switch is in the ON position will prevent the cradle from being racked in.Note: Please check based on above causes. Contact the manufacturer if problems still exist.

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