, p. 3
MicroLok
®
II Track Circuit PCBs
(Formerly known as Union Switch & Signal)
Rev. 4-11
Specifications
MicroTrax Track Circuit PCB
Cab Signal Compatibility: 40, 50, 50 and 100 Hz (see ordering tab.)
T.C. Length Adjustment: 0 to 36,000 ft. (10,973 m) in 1000 ft. (305 m)
increments
Standard Codes:
23 total (3 reserved for link-up, sleep mode and
quick tumble down)
20 (12 sec. acceptance time)
Fast Codes:
2 (6 sec. acceptance time)
Code Format:
AC
Code Message Length:
2 sec.
Code Start/End:
167 msec guard pulse
Code Pulse Durations:
167 or 333 msec.
Code Amplitude:
2V p-p
ECode Track Circuit PCB
Track Circuit Lengths:
ECode-to-ECode: Up to 24,000 ft. (7315 m) @ 3
ohms/1000 ft. (305 m) ballast
ECode to EC4: Up to 15,000 ft. (4572 m) @ 3
ohms/1000 ft. (305 m) ballast
ECode-to-EC5: Up to 24,000 ft. (7315 m) @ 3
ohms/1000 ft. (305 m) ballast
Shunt Det. Response:
Standard: 3.7 to 6.3 sec.
Shunt clear: 11.2 to 12.6 sec.
Quick shunt option: 100 msec (approx.)
Transmitter:
Output to 2.5 Ohms: 1.0 to 2.5 Vdc
Output Impedance: 0.15 Ohms
Current measurement range: 0 to 6.0A
Receiver:
Input impedance: 0.15 Ohms
Current measurement range: 0 to 3.6A
Sys. P.S. Current Draw: +5V: 110 Ma
+12V: 43 Ma
-12V: 52 mA
Battery:
180 Ma (nom.), 1.1A (max.)
OS Track Circuit PCB
Operating Power:
B12/N12 and +5Vdc
Transmit/Receive Freq.:
400 Hz
Receiver Output Voltage:
12 Vdc to 20 Vdc (15 Vdc nom.)
Track Circuit Length:
1000 ft. (305 m)
Track Lead Resistance:
0.5 ohms (max.)
Shunting Voltage Adjust:
Via jumpers
Ordering and Additional
Information
Refer to tabulation for track
circuit PCBs’ part numbers.
Refer to RSE-1A2 for
additional information on
ECode Track Circuit
applications.
Contact your ASTS USA
Account Executive for
MicroTrax and ECode
applications and MicroLok
II applications possibilities
in general.
Request ASTS USA
Service Manual SM-6800E
for detailed information on
ECode Track Circuit
installation and calibration.
Request ASTS USA
Service Manual SM-6800B
for detailed information on
MicroTrax Track Circuit and
OS Track Circuit installation
and calibration.
