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 34 page image

34Installation and maintenance - Three-phase induction motors4850 en - 2018.11 / fLS/LSES MOTORS10.5 - LS/LSES 280 SU/SK/MK,315 (except SN) motors10.5.1 - Dismantling- Remove the screws (27), the grease nipple (42) and itsextension, then take off the cover (13).- Pull out the fan (7) using a hub remover or 2 diametricallyopposed levers, using the shield (6) for support; for analuminium fan, heat the hub to approximately 100°C beforeremoving it.- Take out the key (21).- Unscrew the tie rods (14) then remove them.- Unscrew the DE bearing retainer (33) fixing screws (40) andNDE bearing retainer (32) and (52) fixing screws (62), andremove the bearing retainers.- Unscrew the «CHc» screws of the mobile valves (35 and 56)then unscrew the valves using a hook spanner or a conicalbronze drift; unscrew the valves by hand and remove them.The valves hold the seal (39 and 54).- Remove the fixed valves (34 and 35) from the bearinghousings.- Using a bronze drift, remove the shields (5 and 6) by tappinggently on the shield bosses.- Check that the bearing retainer (53) is smaller in diameterthan the stator, otherwise remove the bearing (50) as per thefollowing instructions.- Remove the rotor (3) from the stator (1) at the drive end,taking care not to touch the winding with the inner bearingretainer if there is no internal turbine.- Take out the bearings (30) and (50) using a bearing remover,while protecting the end of the shaft extension with a washer.Avoid knocking the running surfaces of the shaft.- The bearings are removed either separately or with thebearing retainers (33 and 53); to avoid damaging the bearingretainers, heat the outer bearing ring (the bearing should bediscarded).- Recover the preloading washer or springs (59) from thebearing retainer (53).10.5.2 - Reassembly- See section 6.1 before reassembly.- Insert the inner bearing retainer (33) at the rotor drive end andthe inner bearing retainer (53) at the non drive end, notforgetting to insert the preloading springs (59).- Add new grease: the correct amount of new grease for thebearing is 50% of the free space.- Mount the new bearings (30 and 50) on the shaft, see section6.3 on mounting bearings.- Insert the rotor (3) in the stator (1) taking care not to knock thewinding.- Screw a rod with the same thread diameter as the screws (40)and (62) into one of the tapped holes of the bearing retainers(33) and (53) to maintain the position of the grease nipple whenremounting the shields (5 and 6).- Check that the preloading springs are properly installed.- Fit the NDE shield (6), positioning it on the stator, then mountthe fixed valve (55) in the shield bearing housing.- Mount the mobile valve (56) by either screwing it or locking it,having carefully installed the seal (54) on the valve.- Mount the outer bearing retainer (52) with the bearing retainerlocking screws (62), making sure that the grease drain hole isat the bottom.- Mount the shield (5) at the drive end, positioning it on thestator, then mount the fixed valve (34) in the shield bearinghousing.- Mount the mobile valve (35) by either screwing it or locking it,having carefully installed the seal (39) on the valve.- Mount the outer bearing retainer (32) with the bearing retainerlocking screws (40), making sure that the grease drain hole isat the bottom.- Put the tie rods (14) in place, not forgetting the feet of theprotective cover (380), tighten the nuts diagonally withoutlocking them so that the feet of the protective cover can bepositioned when it is mounted.- Mount the fan (7) using a drift to bed it in position or by heatingthe hub of the aluminium fan to approximately 100°C.- Check that the motor turns freely by hand and that there is noaxial play.- Replace the protective cover (13) and fix it with the screws(27), replace the grease nipple (42) and its extension.- Tighten the rod nuts (14), always diagonally, up to the torquerecommended in section 6.1.- Replace the key (21).52 3239566 59 53 33 554 50 30 34 3562 40553255 6 53 33 53954 50 30 354052623456LS/LSES 280 SU/SK/MK - 315standard bearingsLS/LSES 280 SU/SK/MK - 315drive end roller bearingsNDE DENDE DE