Eaton ATC-100 Instructional Booklet

Also see for ATC-100: Instructional booklet Operation & maintenance manual

Contents

IB01602018E For more information visit: www.eaton.comInstructional BookletEffective: March 2010 Page 27O & M Manual for theATC-100 Breaker Based Transfer SwitchSection 8: Maintenance8.1 IntroductionIn general, ATS switch equipment is designed to be relativelymaintenance free under normal usage. However, because of thevariability of application conditions and the importance placed ondependable operation by this type of equipment, inspection andmaintenance checks should be made on a regularly scheduledbasis. Since equipment maintenance will consist mainly of keep-ing the equipment clean, the frequency of maintenance willdepend to a large extent on the cleanliness of the equipment’ssurroundings. If a significant amount of dust or foreign matter ispresent, a more frequent maintenance schedule should be fol-lowed.It is suggested that visual inspections of the equipment be madeon a regular basis, not just during scheduled periods. Always bealert for an accumulation of dirt in and around the structure; looseparts; and/or hardware, cracks, and/or discoloration to insulation;and damaged or discolored components.8.2 ProceduresA suggested maintenance procedure is outlined in Table 6.Table 6. Periodic Maintenance ProceduresWARNINGHIGH VOLTAGES ARE PRESENT IN AND AROUND ATS EQUIPMENT.BEFORE INSPECTING OR MAINTAINING THIS EQUIPMENT, DISCON-NECT THE LINE POWER FROM, THEN LOCK OUT, IF POSSIBLE, THENEXT HIGHEST DISCONNECT DEVICE. FAILURE TO FOLLOW THISPROCEDURE COULD CAUSE SEVERE PERSONAL INJURY AND/ORDEATH.STEP ACTIONa.Make the ATS equipment safe for inspection and/or maintenance. Disconnect the line power from equipment being serviced by opening the next highest disconnectdevice. Make certain that any accessory control power is switched off by disconnecting all con-trol plugs.b.Inspect the structure area for safety hazards or potential maintenance problems. Inspect the area, especially where molded case switching devices are installed, for any safetyhazards, including personnel safety and fire hazards. Exposure to certain chemical vapors cancause deterioration of electrical connections.Inspect for accumulated dirt, loose hardware, or physical damage.Examine the primary insulation for evidence of cracking or overheating. Overheating will show asdiscoloration, melting, or blistering of conductor insulation, or as pitting or melting of conductorsurfaces due to arcing.Inspect the secondary control connections for damage and the control wiring for insulation integ-rity.c.Inspect the molded case switching devices for dust, dirt, soot, grease, moisture, or corrosion. Remove dust, dirt, soot, grease, moisture, and corrosion contamination from the surface of theswitching device using a dry soft lint-free cloth, dry soft bristle brush, and vacuum cleaner. Donot blow debris into the circuit breaker or nearby breaker structure. If contamination is found,look for the source and fix the problem.d.Check for material integrity, uneven wear, discoloration, or loose hardware. Severe material cracking will require replacement and loose hardware will need to be tightened.e.Check the terminals and connectors for looseness or signs of overheating. Overheating will show as discoloration, melting, or blistering of the conductor insulation.Connections that do not have signs of looseness or overheating should not be disturbed.f. Exercise the molded case switching devices if they are not often exercised while in operation.This will permit a “wiping” action by the contacts. If a switching device is used for frequent switching during normal operation, this step can be dis-regarded.g.Return the ATS equipment to service. Make certain all barriers are in place and doors closed. Reapply secondary and primary power.