Siemens GCP5000 Instruction & Installation Manual page 255

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When the train clears the RX1 circuit: the RX1 pickup delay (LOS/programmed time delay)
starts as the train exits RX1 (LOS time running will be indicated as a flashing LED). Once LOS
expires RX1 energizes and Stick1 de-energizes. The Stick1 indicator LED goes out and the
RX1 LED lights. OUT1 remains energized, OUT2 de-energizes, and OUT3 remains de-
energized. Stick 1 is cleared in the Log.
See Section 5.2.3 for information regarding external track circuit substitutes.
The GCE can receive vital inputs from external sources that affect the operation of the PSO
receivers and island as described in the following section:
IT IS RECOMMENDED TO SET PICKUP DELAY TO TWO SECONDS
FOR ALL RECEIVER/XR OUTPUTS. THIS PROVIDES A 2 SECOND
LOSS OF SHUNT TIME.
5.2.3 External Track Circuit Replacing an Internal Receiver or Island
An external track circuit such as a preexisting audio overlay or DC track circuit may be used in
place of either an approach receiver or an island in the Crossing Assembly. This is done by
setting:
•
RX1 Receiver Mode to External on PSO 'n' Receiver Menu
•
RX2 Receiver Mode to External on PSO 'n' Receiver Menu
•
Island Mode to External on PSO 'n' Island menu
Then assign the external receiver or island to a vital input on a module, for example,
•
IN 1.1 PSO 1 RX1 External
•
IN 1.2 PSO 1 External Isl
•
IN 2.1 PSO 1 RX2 External
5.2.4 Multiple Track Circuits Used to form an Approach
The approach to the crossing may consist of multiple track circuits, some or all of these may be
PSOs
PSO 'n' RX 1 and 2 are viewed as the main track circuit to the left and right of the crossing.
Additional track circuits can be combined with these by using the PSO Enable. For example,
•
Set RX1 Enable Used to Yes on the PSO 'n' menu.
Then an additional external track circuit can be added to the RX1 approach by assigning the
RX1 Enable to an input and wiring the track circuit to this input, for example:
•
IN 1.1 PSO 1 RX 1 Enable.
The additional track circuits associated with the RX 1 approach may be monitored by other PSO
receivers in the GCP5000 (GCE), for example, let's assume there are 2 other track circuits
monitored by PSO 4 RX1 and PSO 5 RX1 that need to be combined with PSO 1 RX1. This can
be done by using Internal channels, for example, got the Internal I/O 1-4 page and set:
SIG-00-22-02
Version: B.1
BASIC APPLICATION GUIDELINES & PROGRAMMING
CAUTION
5-11
JUNE 2022 (Revised September 2022)