4000 Switch Machine - Alstom

SECTION 2THEORY OF OPERATIONINTRODUCTIONThe following is a functional overview of the GM4000 Switch Machine. The operation of afunctional area is described along with associated modules and components.DRIVE TRAINThe GM4000 switch machine drive train consists of a motor, two gearboxes, and a main drivemodule. The motor is bolted to and drives a 5:1 gearbox. The 5:1 gearbox is coupled to anddrives a 30:1 gearbox. The 30:1 gearbox drives 1.58:1 open spur gears. The splined main drivecrank converts the rotational movement of gears into a linear movement of the throw bar andcam bar. This drive train, along with the throw bar, provides the thrust required to throw aswitch in 4, 9, or 15 seconds in 110V (AC or DC) applications and 17 seconds in 24 VDCapplications. Note that the speed of machine switching is dependent on supplied voltage.SEQUENCE OF OPERATIONThe correct order of operation for the GM4000 switch machine is as follows:1. Break indication2. Unlock3. Throw4. Lock5. Indicate if switch points are in correct positionP2444, Rev. Sep/00 2-1 ALSTOM Signaling Inc.