General Procedure for Testing Crew Switch Follow all safety procedures. Ensure that the doors are closed. Insert the maintenance key and rotate to the position. open Keep the maintenance key in the open position during the complete door opening stroke. Verify that the front door opens. Rotate the maintenance key to closed position. Verify that the front door is closed. Limit/Proximity Switch Limit Switches, also referred to as a Proximity, Switch, is an electrical switch that tells the door processor the exact door location. When the door gets to a certain position, the limit switch is triggered, which signals to the door that it has hit its maximum or minimum point. For example, when a rail vehicle door opens and hits the limit switch, the door then stops. Limit switches are adjustable and therefore, must be inspected and maintained. Some agencies will have one switch per door assembly, while others may have two. San Diego MTS, for example, has two limit switches on their doors. One switch signals that the door is closed while the second switch signals that the door is locked when the locking mechanism drops into place. SD MTS manually cycles the doors to look at the switches when inspecting. Pneumatic and electric doors will generally follow the same procedure for testing Limit Switches. As always, check with your agency for specific agency procedures to follow. Figure 2.2 Limit Switch. Courtesy of DART. General Procedure for Testing Limit Switches door and visually check where it stops in relation to the switch. Is door fully open or closed in relation to switch? Make adjustments as needed Pushbuttons: Passenger and Operator
General Procedure for Testing Crew Switch Follow all safety procedures. Ensure that the doors are closed. Insert the maintenance key and rotate to the open position. Keep the maintenance key in the open position during the complete door opening stroke. Verify that the front door opens. Rotate the maintenance key to closed position. Verify that the front door is closed. Limit/Proximity Switch Limit Switches, also referred to as a Proximity, Switch, is an electrical switch that tells the door processor the exact door location. When the door gets to a certain position, the limit switch is triggered, which signals to the door that it has hit its maximum or minimum point. For example, when a rail vehicle door opens and hits the limit switch, the door then stops. Limit switches are adjustable and therefore, must be inspected and maintained. Some agencies will have one switch per door assembly, while others may have two. San Diego MTS, for example, has two limit switches on their doors. One switch signals that the door is closed while the second switch signals that the door is locked when the locking mechanism drops into place. SD MTS manually cycles the doors to look at the switches when inspecting. Pneumatic and electric doors will generally follow the same procedure for testing Limit Switches. As always, check with your agency for specific agency procedures to follow. Figure 2.2 Limit Switch. Courtesy of DART. General Procedure for Testing Limit Switches door and visually check where it stops in relation to the switch. Is door fully open or closed in relation to switch? Make adjustments as needed Pushbuttons: Passenger and Operator
RV_209_Coursebook.docx