GM4000A™ Switch Machine - Alstom

General Description1.7.20. Point Detector Switch ModuleThe point detector switch module consists of two rotary cam switches (right and left)used to indicate the switch point position and switch machine correspondence.Figure 1-20 shows the point detector switch module, while Figure 1-4 shows thelocation of the module.TOP VIEWSIDE VIEWFigure 1-20. Point Detector Switch ModuleThe point detector switch module bolts to the switch machine base and it is driven bythe point detector module pivot arm.The point detector switch module, along with other components of the point detectorsystem, indicate to the train control room if a switch point position has moved off pointand can be utilized to indicate normal and reverse switch positioning.Each switch has five contacts. Two are used in the indication relay circuit for acorrespondence condition; two are used to shunt the relay circuit in mid-stroke; and oneis used in the latch out circuit.P2496, Rev. 6, Jul/11 1-26 Alstom Signaling Inc.