Reno A&E U-1400 Operation Manual Download Page 17

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889-2106-03

Model U-1400 Operations Manual Rev Apr 2020 Page

of 39

Operation in either Synch mode requires that the Reset inputs (pin Z of the primary interface connector) of all
detectors be tied together and that the DC Common inputs (pin G of the primary interface connector) of all
detectors be tied together. To start operation in either Synch mode, the detectors must be reset using the Reset pin
(pin Z of the primary interface connector).

When operating in Series Synch mode, if any detector fails to Synch, all of the Vital Outputs of every detector
configured to operate in Synch mode will be deactivated. If the detector that has failed to Synch has the Synch
feature turned off, the other detectors configured to operate in Synch mode will continue to operate in Series Synch
mode.

When operating in Parallel Synch mode, if the master unit fails, all of the Vital Outputs of every detector
configured to operate in Synch mode will be deactivated. If one or more of the detectors connected to the master
unit Fails, only those Vital Outputs of the detector(s) which has (have) failed will be deactivated.

When operating in either Series or Parallel mode,

FSY

will be displayed on the LCD screen of the detector(s)

associated with the failure. This display state will continue until the problem is corrected and the detectors are
powered down and repowered, reset, or until the Synch function is turned off.

In either mode of operation, the Synch feature will continue to function if one or more detectors has (have) been
disabled.

NDUCTIVE

SLAND

IRCUIT

: The Inductive Island Circuit feature provides a means of monitoring and detecting the

presence of vehicles within at-grade crossings. The expected installation is two 20-foot long arming loops located
on either side of the crossing and one or two main channel loops spanning the crossing. The two arming loops
must be connected to detector Channels 1 and 3. If two main channel loops are required, they should be connected
to Channels 2 and 4. If the installation requires a single main channel loop, it should be connected to Channel 3
and Channel 4 should be deactivated (i.e. set the Channel 4 sensitivity to the Loop-Off state).

This option is a detector wide option. Turning this option

for one loop input automatically turns it

for the

other loop inputs. The sequence of operation starts with a detection on one of the two arming loops. Once this
presence detection has occurred, the remaining two or three input channels arm and Auxiliary Vital Output 1
deactivates. As the vehicle proceeds from the first arming loop onto the main channel loop(s) and onto the other
arming loop, presence detection continues and deactivation of Auxiliary Vital Output 1 is maintained. Once the
vehicle has cleared the second arming loop, presence detection ends and Auxiliary Vital Output 1 reactivates.

NDUCTIVE

HUNT

NHANCEMENT

IRCUIT

: The Inductive Shunt Enhancement Circuit feature provides a means of

determining 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. The loops must be connected to
channels 1 and 2 or channels 3 and 4.

This option is a paired input option. This means that it takes two inputs to implement the feature. When this
option is toggled

OFF

for one input, its paired input is also set to the same state. Channel 1 is paired with

Channel 2 and Channel 3 is paired with Channel 4. 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.

3.4

TABLE: SENSITIVITY, -

∆L/L, AND RESPONSE T

IME

Sensitivity

ΔL/L

Response Time (milliseconds)

One

Detector

Two Detectors

Three Detectors

Four Detectors