Interlocking - Alstom

VPI ® II Lamp Driver Output Board (LDO2)InterlockingLDO2 (LAMP DRIVER OUTPUT) BOARDThe Lamp Driver Output Board is a vital output board used to provide power to signals for both transit and railroadapplications. Using the same proven vital techniques found on other VPI vital output boards, the new LDO2 includes thefollowing features:> Current Monitoring - reads the current through the output every 200 milliseconds. This current can be compared to oneof eight different threshold levels from 0.0 to 3.25 Amps, which will turn the output off if it is not drawing the minimumrequired current. The filament checking routines enables down grading and prevents against overcurrent and shortprotection.> Cable Integrity Check - uses isolated voltage sensing at the output to determine if a potential exists across the outputwhen the output is off. A separate switch for each output can be used to select the system reaction to this event bylogging the error or dropping a vital relay.> Diagnostic Interface to VPI CPU II Board - registers all current readings and error conditions and can be read or clearedvia the CPU II board.> Board Edge User Interface - registers all current readings and error conditions and can be read or cleared alternatively viathe Board Edge User Interface.VPI LDO2 Board44CALL 800.717.4477 • FAX 585.274.8777