GM4000A™ Switch Machine - Alstom

General Description1.7.17. Motor Gear Box HeaterThe GM4000A can be configured with or without a motor gear box heater. The availableheater operates at 24 VDC or 110 VAC/VDC.The motor gear box heater is used to maintain the temperature of the motor gear box invery cold climates.Figure 1-18 shows the Motor Gear Box Heater. The heater is shown installed on themotor gear box in Figure 7-1, sheet 5, detail “G.”THERMOSTATFigure 1-18. Motor Gear Box Heater1.7.18. Motor Limit SwitchesTwo motor limit switches are part of the wire harness. They provide feedback to thecontroller, stopping the motor at completion of a stroke. One switch is open and oneswitch is closed when the switch machine is at the end of stroke in the “normal” position.When the switch machine is at the end of stroke in the “reverse” position the switchposition is reversed (the first one is closed and the second one is open). Both switchesare closed in mid stroke.Figure 1-3 shows the location of the motor limit switches. Figure 1-24 shows the wireharness.P2496, Rev. 6, Jul/11 1-24 Alstom Signaling Inc.