Eaton ATC-300 O & M Manual

Also see for Cutler-Hammer ATC-300: Instruction booklet Operation and maintenance manual Instruction booklet Instruction booklet O & M Manual

IB01602015E For more information visit: www.eaton.comInstruction BookletEffective: August 2010 Page 23ATC-300 2-Postion Contactor Based Transfer SwitchSection 7: Adjustments7.1 GeneralRefer to I.B. 01602009E, supplied with the ATS for ATC-300Controller adjustments and programming.Section 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;loose parts; and/or hardware, cracks, and/or discoloration toinsulation; and damaged or discolored components.8.2 ProceduresA suggested maintenance procedure is outlined in Table 5.Table 5. 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 disconnect device. Makecertain that any accessory control power is switched off by disconnecting all control plugs.b. Inspect the structure area for safety hazards or potential maintenance problems. Inspect the area, especially where switching device is installed, for any safety hazards, including personnelsafety and fire hazards. Exposure to certain chemical vapors can cause 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 as discoloration,melting, or blistering of conductor insulation, or as pitting or melting of conductor surfaces due to arcing.Inspect the secondary control connections for damage and the control wiring for insulation integrity.c. Inspect the power contactor for dust, dirt, soot, grease, moisture, or corrosion. Remove dust, dirt, soot, grease, moisture, and corrosion contamination from the surface of the switching deviceusing a dry soft lint-free cloth, dry soft bristle brush, and vacuum cleaner. Do not blow debris into the powercontactor. 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. Contact Inspection Procedure Carefully remove the arc chute clips using needle nose pliers. Remove the arc chutes to inspect the contacts.Contact Eaton Care (1-877-ETN-CARE, Option-2) if the contacts have excessive wear. Reinstall the arc chutesand arc chute clips, making sure the ends of the clips are fully seated in the grooves on the barriers.g. Exercise the power contactor if it is not often exercised while in operation. This will permit a “wiping” action by the contacts. If the power contactor is used for frequent switching during normal operation, this step can be disregarded.h. Return the ATS equipment to service. Make certain all barriers are in place and doors closed. Reapply secondary and primary power.