Nidec Leroy-Somer PLSES Series Installation & Maintenance

Also see for Leroy-Somer FLSES Series: Commissioning and maintenance guide

Nidec Leroy-Somer PLSES Series Installation & Maintenance Manual pdf 44 page image

44Installation and maintenance - Three-phase induction motors4850 en - 2018.11 / fFLS/FLSES MOTORS11.5 - FLS/FLSES 315 to 355 LD motors11.5.1 - Dismantling the NDE shield- Remove the fixing screws (27) and then take off the cover(13).- Remove the shaft extension screw if necessary.- Take out the fan (7).- Remove the fixing screws from the inner NDE bearing retainer(53).- Remove the fixing screws (273) from the NDE shield (6).- Remove the fan key if appropriate.- Using two levers or a flexible hammer, disengage the NDEshield (6) taking care not to place it aslant. Remove the shieldby sliding it along the shaft.- Put the dismantled components to one side and retrieve thepreloading springs (256), which should be replaced in theirhousing.11.5.2 - Dismantling the DE shield- Dismantle the DE shield without removing the rotor (3). To dothis:- Remove the fixing screws (270) from the DE shield (5).- Remove the fixing screws (40) from the DE internal cover(33).- Take out the key (21).- Using two levers or a flexible hammer, disengage the DEshield (5) taking care not to place it aslant.- Remove the shield by sliding it along the shaft.11.5.3 - Changing the antifriction bearings- Using an appropriate lifting tool, take out the rotor withoutknocking the winding.- Remove the DE (38) and NDE (60) circlips.- Remove the bearings (30) and (50) with an appropriate tool,protecting the end of the shaft extension. Do not knock therunning surfaces of the shaft.- Change the bearings in accordance with the instructionsdescribed in the General information in section 6 (shrinkfittingonly).IMPORTANT : Before undertaking any of these procedures,read the «CHECKS BEFORE REASSEMBLY» section.11.5.4 - Reassembly- Mount the DE bearing (30) on the rotor shaft (take care not toforget the inner bearing retainer (33) and the circlip (38)!), andalso the NDE bearing (50) if and only if the stator inner Ø allowsthe inner NDE bearing retainer (53) to pass through, refit thecirclip (60), refit the preloading springs in their housing in theinner NDE bearing retainer (53).- Insert the rotor into the stator taking care not to knock thewinding. Install the NDE bearing if this has not already beendone.- Fill the decompression grooves (416) located in the shaftwayand the grease inlet pipes with grease.- Present the shields, grease nipples facing upwards. Beginwith the DE shield (5). Fix a dowel pin in one of the inner bearingretainer (33) tapped holes so that the grease inlet pipes fullycorrespond.- End with the NDE shield (6). Fix a dowel pin in one of the innerbearing retainer (53) tapped holes so that the grease inletpipes fully correspond.- Lift the rotor slightly and fit the shields in place.From now on, we recommend checking at every step thatthe rotor turns freely by hand before continuing to the nextinstruction.- Replace the shield fixing screws (270) and (273).- Insert the fixing screws on the inner bearing retainers (33) and(53). Replace the AZ washers to ensure a perfect seal.- Replace the fan key if appropriate.- Replace the fan (7).- Replace the shaft extension screw if necessary.- Replace the cover (13) and reinsert the fixing screws (27).- Lubricate the DE and NDE antifriction bearings, turning theshaft by hand.Amount of grease for ball bearings:- Frame size 315 : DE and NDE = 50 g for 4P and + / 35 g for 2P- Frame size 355 : DE and NDE = 60 g for 4P and + / 35 g for 2P5053335 64165053335 6416FLS/FLSES 315 to 355 LDstandard bearingsNDE DEFLS/FLSES 315 to 355 LDdrive end roller bearingsNDE DE