American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 63)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-58 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Code rates and their meanings shall be:

The nominal cab signal rail current shall be 3 amps at the entering end of track circuits and

the feed end shall be no greater than 20 amps.

The carrier frequency shall be 100 Hz 2 Hz.

The code rate tolerance shall be 5%.

The code duty cycle shall be 60/40 to 40/60.

Dead sections, such as at insulated rail joints, shall be no greater than 14 feet in length.

9.4.3.4 Train-to-Wayside Communication

The Train-to-Wayside Communication (TWC) system shall be compatible with Hanning &

Kahl HCS-V.

TWC transponders shall be provided at the following minimum locations:

 Approach to all wayside signals

 At stations with near-side at-grade crossings

 At the terminus station (for calling of a route onto the main line)

9.4.3.5 Train Detection

The signaling system shall detect all cars operating independently or in consist, and any

other rail vehicle present, except hi-rail vehicles.

The presence of a rail vehicle in a section of the route shall be detected continuously by

means of track circuits.

CODE RATE INDICATION

410 PPM (6.83 Hz) Cab signal cutout. Used for Street Running mode

(35 mph speed limit).

270 PPM (4.5 Hz) Proceed at 55 mph.

180 PPM (3 Hz) Proceed at 45 mph.

120 PPM (2 Hz) Proceed at 35 mph.

75 PPM (1.25 Hz) Proceed at 25 mph.

50 PPM (0.833 Hz) @ 100Hz,

asynchronously combined with 50

PPM (0.833 Hz) @ 250Hz

Proceed at 15 mph.

50 PPM (0.833 Hz) Restricted (Yard). Proceed at maximum of 10 mph,

prepared to stop.

Unmodulated 100 Hz Stop

No Code

Stop and Proceed. Approaching a signal at stop or

when occupancy exists ahead that requires

immediate brake application to safely avoid a

collision.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 63