Air Brakes and Train Handling Rules - Alaska Railroad
Air Brakes and Train Handling Rules - Alaska Railroad Air Brakes and Train Handling Rules - Alaska Railroad
68 EOT Telemetry DevicesAny message appearing higher on the list will be displayed in placeof an alarm message that appears lower on the list.After an alarm condition has been cleared, the next radio transmissionreceived by the LCU will reset the alarm and remove the alarmmessage from the message display.A. Dead BatterySee Rule 68.3.1D, Battery Status Displays.B. Emergency Valve Circuit FailureIf the emergency valve circuit in the EOT fails, the LCU will:• Sound an alarm.• Display the VALVFAIL alarm message on the message displaywindow.If this alarm occurs, check the EOT becausethe emergency braking function may not beoperational.C. Rear-To-Front Communications FailureIf no radio transmissions are received from the selected EOT for aperiod of 5 minutes 41 seconds, the LCU will:1. Sound an alarm for 5 seconds.2. Light the RADIO BREAK LED.3. Display the RF NOCOM alarm message on the message displaywindow.4. Cause the pressure display to go blank.5. Turn off the MOV (or STP) and HVM ON (or HVM OFF)LEDs.June 1, 1996 ARRC Air Brakes and Train Handling Manual 68-9
68 EOT Telemetry DevicesThe RF NOCOM message will remain displayed until the selectedEOT unit sends a valid transmission. After the RF NOCOM alarmcondition has cleared, the next radio transmission received by theLCU will remove the alarm message from the message display andallow normal operation to resume.D. Front-To-Rear Communications FailureOne of these two conditions causes a front-to-rear communicationsfailure alarm:• The EOT sends no confirming message 15 seconds after theEMERGENCY SWITCH has been activated.or• The EOT sends no confirming message for 6 minutes 30 secondsafter an automatic communication test from the LCU.When either of the above situations occurs, the LCU will:1. Sound an alarm for 5 seconds.2. Display the FR NOCOM alarm message on the message displaywindow.The FR NOCOM message will remain until front-to-rear communicationsare restored or a higher priority message overrides the alarmmessage.The FR NOCOM message will be removed if a confirming messageis received after:• The COMMUNICATIONS TEST/ARM button is operated.• A response is received to an automatic communications poll theLCU initiated.E. Replace BatterySee Rule 68.3.1D, Battery Status Displays.F. Pressure DisplaySee Rule 68.3.1B, Pressure Display.68-10 ARRC Air Brakes and Train Handling Manual June 1, 1996
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68 EOT Telemetry DevicesAny message appearing higher on the list will be displayed in placeof an alarm message that appears lower on the list.After an alarm condition has been cleared, the next radio transmissionreceived by the LCU will reset the alarm <strong>and</strong> remove the alarmmessage from the message display.A. Dead BatterySee Rule 68.3.1D, Battery Status Displays.B. Emergency Valve Circuit FailureIf the emergency valve circuit in the EOT fails, the LCU will:• Sound an alarm.• Display the VALVFAIL alarm message on the message displaywindow.If this alarm occurs, check the EOT becausethe emergency braking function may not beoperational.C. Rear-To-Front Communications FailureIf no radio transmissions are received from the selected EOT for aperiod of 5 minutes 41 seconds, the LCU will:1. Sound an alarm for 5 seconds.2. Light the RADIO BREAK LED.3. Display the RF NOCOM alarm message on the message displaywindow.4. Cause the pressure display to go blank.5. Turn off the MOV (or STP) <strong>and</strong> HVM ON (or HVM OFF)LEDs.June 1, 1996 ARRC <strong>Air</strong> <strong>Brakes</strong> <strong>and</strong> <strong>Train</strong> H<strong>and</strong>ling Manual 68-9
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