P12x/EN T/Eb6 - Schneider - error

P12x/EN CM/Eb6Page 16/18Commissioning and MaintenanceMiCOM P120/P121/P122/P1235.2 Method of repair5.2.1 Replacing the active partBEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THEUSER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETYGUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY ANDTECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL ANDALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.The case and the rear terminals blocks have been designed to facilitate removal of theMiCOM P12x relay should replacement or repair become necessary without disconnect thescheme wiring.NOTE:The MiCOM range of relays have integral current transformer shortingswitches which will close when the active part is removed from thecase.Remove the upper and lower flap without exerting excessive force. Remove the externalscrews. Under the upper flap, turn the extractor with a 3 mm screwdriver and extract theactive part of the relay by pulling from the upper and lower notches on the front panel of theMiCOM relay.The reinstall the repaired or replacement relay follow the above instruction in reverse,ensuring that no modification has been done on the scheme wiring.On completion of any operations which require the relay to be removed from its case, verifythat the four fixing screws are fitted at the corners of the front panel, under the flaps. Thesescrews secure the chassis (removable part) to the relay case, ensuring good seating/contact.5.2.2 Replacing the complete relayTo remove the complete relay (active part and case) the entire wiring must be removed fromthe rear connector.Before working at the rear of the relay, isolate all current supplies to the MiCOM relay andensure that the relay is no more powered.WARNING:NEVER OPEN THE SECONDARY CIRCUIT OF A CURRENTTRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BELETHAL AND COULD DAMAGE to the INSULATION.Remove all wiring (communication, logic inputs, outputs, auxiliary voltage, current inputs).Disconnect the relay earth connection from the rear of the relay.Remove the screws used to fasten the relay to the panel, rack, etc… .These are the screwswith the larger diameter heads that are accessible when the upper and lower flaps areinstalled.Withdraw the relay from the panel, rack, etc… carefully because it will be heavy due to theinternal transformers.To reinstall the repaired or replacement relay follow the above instructions reverse, ensuringthat each terminal block is relocated in the correct position and case earth, communicationare replaced.Once reinstallation is complete the relay should be recommissioned using the instruction insections 1 to 4 inclusive of this chapter.