Siemens GCP5000 Instruction & Installation Manual page 293

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VERIFY THAT THE FOLLOWING ARE AS SPECIFIED BY THE
RAILROAD'S OR AGENCY'S APPROVED WIRING OR
INSTALLATION DIAGRAM. FAILURE TO DO SO MAY LEAD TO
INCORRECT OR UNSAFE OPERATION OF THE TRACK CIRCUIT.
1.
2.
3.
ENSURE THERE ARE NO OTHER SHUNTS (OR TRAIN, TRACK
EQUIPMENT) CLOSE TO THE ISLAND OTHER THAN THE
REQUIRED CALIBRATION SHUNT BEFORE PERFORMING
CALIBRATION.
AFTER CALIBRATION, VERIFY THAT THE TRACK CIRCUIT DE-
ENERGIZES WHEN THE ISLAND CIRCUIT IS SHUNTED WITH THE
APPROPRIATE CALIBRATION RESISTANCE ACCORDING TO
RAILROAD PROCEDURES AND APPLICABLE FRA RULES.
FAILURE TO DO SO MAY LEAD TO INCORRECT OR UNSAFE
OPERATION OF THE TRACK CIRCUIT.
IF THE ISLAND IS CALIBRATED IN POOR BALLAST CONDITIONS,
IT MUST BE RE-CALIBRATED WHEN BALLAST CONDITIONS
IMPROVE.
AFTER INSTALLATION OR AFTER ANY ISLAND MENU CHANGES
HAVE BEEN MADE, RECALIBRATE THE ISLAND CIRCUIT AND
TEST FOR PROPER OPERATION.
FOR ALL ISLAND INSTALLATIONS WHERE POOR SHUNTING HAS
BEEN EXPERIENCED OR IS ANTICIPATED, PROGRAMMING A 4-
SECOND ISLAND PICKUP DELAY AND UTILIZING A 0.3 OHM
SHUNTING SENSITIVITY CALIBRATION ARE RECOMMENDED.
IN AREAS OF PASSENGER OPERATION, A MINIMUM OF 0.3 OHM
SHUNTING SENSITIVITY IS RECOMMENDED.
Table 6-1 provides hardwire shunt distance values for shunting
sensitivities of 0.12, 0.3, 0.4, and 0.5 ohms for areas where poor island
shunting may be a problem. Proper shunt distance is shown on the
display, providing the shunt distance for the specified frequency.
SIG-00-22-02
Version: B.1
GCP5000 (GCE) INSTALLATION, CALIBRATION AND SYSTEM OPERATIONAL CHECK
ISLAND FREQUENCY
ISLAND PICKUP DELAY
PSO MODULE SOFTWARE VERSION
6-9
WARNING
NOTE
JUNE 2022 (Revised September 2022)