Rexnord-Stephan S4 Catalogue

04-2007 3P0200-XX7. Technical Appendix7.4.2 Backstops in the input lanternBackstops are used to limit the direction of rotation to a freely selectable direction of rotation. In the opposite direction,backstops act as a blocker. Backstops are frequently used for conveyor drives that are operated in a tilt positionor for fan drives. In both cases, there is only one free direction of rotation, whereby a spinning of the drive isdesired for the opposite direction.In certain applications, backstops can be an alternative to an electromagnetic brake on the motor.The backstops are placed at the drive shaft (U/L-lantern) between the regular bearing and are mounted dependentupon the desired free direction of rotation according to the order. The free direction of rotation must be specified atordering.If speed-disengaging backstops are used, this safety component needs to be checked only every 6 000 operatinghours or no later than every 3 years. The system operator must take all the necessary safety precautions to avoidfailure of the backstop that may result in personal injuries and/or damages to the drive unit and/or the application.It is necessary to replace the backstop under the following conditions:lllIn the event of observing unusually high wear of the gear unit.When the oil in the gear unit is contaminated.In the event of unusually high load.This may have had an adverse effect on the condition of the clamping elements and bearing races in the integratedbackstop.7CAUTION!Only authorized, qualified personnel is permitted to replace the backstop or change the direction of rotation ofthe backstop while complying with the operating instructions for the respective backstop.Never loosen or release any part of the backstop facility while the drive is under load: This could affect thereversal action of the drive and load; the drive unit must be in a no-load condition and secured against inadvertentmovements.7.4.3 Backstop at the intermediate shaft for SK4 helical bevel geared motorsSK4 helical bevel geared motors offer a more cost-efficient option for mounting backstops at the intermediate shaftof the bevel gear stage. The additional use of a U-lantern (IEC adapter) does not apply, and the motors can beintegrally mounted at the gear unit. The lubricant supply is then ensured via the normal gear unit oil (observemounting positions!).T41