KB781: AR1 Auto-Reverser Trip Current Adjustment

This article was last updated on May 8, 2012, 2:59 p.m. | Print Article | Leave Feedback

The tuneable trip current (TTC) adjustment allows you to set the current at which the reversing section reverses when the train crosses the gap into the section. This allows you to improve the operation of your reversing sections.

The tuneable trip current is adjustable from .25 amps to 8 amps. Turning the TTC screw clockwise increases the current trip point and turning the TTC screw counterclockwise decreases the current trip point. The total adjustment is approximately one half revolution of the TTC adjustment screw. The TTC adjustment is made using a full load on the reversing track--the total number of locomotives/cars that will be in the reversing loop.



1. Turn the TTC adjustment screw to the midpoint position.

2. Turn on track power.

3. Place a locomotive on the mainline and operate it into the reversing section. It will trip 1 time at the beginning of the loop or at the end of the loop. It should not trip more than once while the train is in the loop.

a. If the AR1 trips more than once, the trip current is set too low.

Turn the TTC clockwise slightly to increase the current trip point. Repeat the test
until the AR1 trips once while the train goes through the reversing section.

b. If the AR1 does not trip and the booster shuts down, the trip current is set too high.

Remove the train from the reversing section and allow the booster to reset. Turn the TTC counterclockwise slightly and repeat the test until the train trips the AR1 once without shutting down the booster.

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