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Masterpact maintainence guide 1

Low voltage electrical distribution Masterpact NT and NW Circuit breakers and switch-disconnectors Maintenance guide This guide is intended primarily for quali ?ed personnel in charge of equipment maintenance and for Schneider Electric after-sales support personnel for the information on system diagnostics Thank you for purchasing a Merlin Gerin protection device To maintain the device's operating and safety characteristics as they are indicated in the catalogue from the beginning to the end of the product's service life Schneider Electric recommends that systematic checks and periodic maintenance be carried out by quali ?ed personnel as indicated in this Masterpact maintenance Please read this document carefully and keep it at hand near the device It provides detailed information on b the various types of maintenance required depending on the criticality of the protected circuit b what must receive maintenance b the risks involved if the component ceases to operate correctly b what is understood by the terms normal improved and severe environment and operating conditions b the periodic preventive maintenance operations that should be carried out under normal environment and operating conditions as well as the level of competence required for the operations b the environment and operating conditions that accelerate device ageing b the limits governing use of mechanical and electric accessories and subassemblies b ?nally all the product guides available in order to maintain the device in proper operating condition The level II and III procedures mentioned in this guide may be obtained on request from the Schneider Electric after-sales support department Maintenance guide for circuit Contents breakers and switch-disconnector Masterpact NT and NW The di ?erent types of maintenance Corrective maintenance Preventive maintenance Predictive maintenance Masterpact NT and NW What must be maintained and why The case Arc chutes Main contacts Device and chassis mechanisms Auxiliary circuits Electronic trip unit Communication module and accessories Connections Recommended preventive maintenance and time intervals Normal conditions Favourable conditions or device protected Severe conditions and device not protected Device check-up Check after prolonged storage Level II preventive maintenance recommended every year Level III preventive maintenance recommended every years Level IV manufacturer diagnostic and replacement of components recommended every years Causes of accelerated ageing In uence of the environment Ambient temperature outside the switchboard Percent load I In Relative humidity Salt environment Harmonics Dust Corrosive atmosphere Environment categories as per standard - - Operating conditions Vibrations Number of operating cycles Interrupted current Operating limits List of available guides Switchgear guides Troubleshooting and solutions LVPED EN - Masterpact NT and NW Maintenance guide The di ?erent types of maintenance Corrective maintenance Corrective maintenance repairs a system in view of ful ?lling a required function Incidents during system start-up Many malfunctions result from non- observance of the start-up instructions or lack of knowledge concerning the equipment and or switchgear procedures Schneider Electric operating guides supplied with products and equipment contain clear instructions for operators or maintenance personnel on how to correct malfunctions These instructions are included at the end or this guige The list of the available