03-02-2020, 02:22 PM
Let me try again.
Assume we have a timer (QRJ1 relay) that is used to measure the time before one can cancel a set route. This timer begins counting as soon as the train passes approach lock.
Question 1. How should the system react if the timer malfunctions when the train passes the approach lock section?
Question 2: Should the system be designed to specifically account for this situation?
Question 3: Are there any specifications about these types of timers with respect to which contacts to use (back or front)?
Question 4: Do the same apply for timers used in overlap (to release facing points)?
Thank you for your patience with my question.
Assume we have a timer (QRJ1 relay) that is used to measure the time before one can cancel a set route. This timer begins counting as soon as the train passes approach lock.
Question 1. How should the system react if the timer malfunctions when the train passes the approach lock section?
Question 2: Should the system be designed to specifically account for this situation?
Question 3: Are there any specifications about these types of timers with respect to which contacts to use (back or front)?
Question 4: Do the same apply for timers used in overlap (to release facing points)?
Thank you for your patience with my question.