889-2106-03
Model U-1400 Operations Manual Rev Apr 2020 Page
5
of 39
2.13
OPTION 9: INDUCTIVE SHUNT ENHANCEMENT CIRCUIT FEATURE
The detector’s Inductive Shunt Enhancement Circuit option can be toggled
ON
or
OFF
by momentarily pressing
either the
(UP) or
(DOWN) pushbutton. Option 9 is a paired input option. This means that it takes two
inputs to implement the feature. When this option is toggled
ON
or
OFF
for one input, its paired input is also set
to the same state. In the Model U-1400, input Channel 1 is paired with input Channel 2 and input Channel 3 is
paired with input Channel 4. NOTE: Option 9 is mutually exclusive with Option 8. Only one option can be
enabled at a given time. If an attempt is made to turn one option
ON
while the other is enabled, a warning buzzer
will sound to provide an alert that the other mutually exclusive option is
ON
.
When Option 9 is turned
ON
, a vehicle entering the first loop will cause that input channel to enter a pending state.
As the vehicle enters the second loop while still occupying the first loop, the second input channel will enter the
Call state while the first input channel remains in the pending state. A Call is never output on the first input
channel with a detection. Under normal conditions it is not possible to have both outputs on at the same time.
However, if one of the loops fails, both outputs will come on and stay on until the failure is corrected.
The sequence of operation starts with a detection on one input channel. When both of the paired input channels
have detection, the last input channel to have detection will output a Call and its Primary Vital Output(s) (if
mapped) and Auxiliary Vital Output(s) (if mapped) deactivate until the detection for the last input ends, even if the
detection ends for the first input channel. Primary Vital Output timing functions (Primary Vital Output Delay or
Primary Vital Output Extension) are unaffected by the setting of this feature. When detection ends for both input
channels, the Call output will cease and the Primary Vital Output(s) (if mapped) and Auxiliary Vital Output(s) (if
mapped) will reactivate.
This feature is used in applications where it is necessary to determine the travel direction of vehicles operating on a
two-way section of railway trackage. The expected installation is two 20-foot long loops spaced approximately 25
to 28 feet apart. Contact a Technical Support representative at Reno A&E regarding proper loop configurations
and spacing for specific applications.
Basic Installation - Dual Main Channel Loops
Channel 1 and Channel 3 Loops are Arming Loops
Channel 2 and Channel 4 Loops are Main Channel Loops
Channel 1 Loop
Channel 3 Loop
Channel 2 Loop
Channel 4 Loop
Vehicle enters Channel 1 Loop
N C ll i
t
t
Vehicle enters Channel 2 Loop
N C ll i
t
t
Vehicle proceeds to Channel 2 Loop
C ll i
t
t
Ch
l 2
Vehicle proceeds to Channel 1 Loop
C ll i
t
t
Ch
l 1
Channel 1 Loop
Channel 2 Loop
