American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 50)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-45 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

R = Reaction time in seconds (includes operator, cab signal delays and brake build-up) =

4.0 seconds.

B = Safe Braking rate = 2.0 mphps

G = Alignment grade as a decimal fraction

The target point for achieving the speed reduction shall be the tangent-to-spiral point on

curves and the point of switch for turnouts.

Civil speed restrictions shall be maintained until the rear of the train is clear of the

restriction. For curves, this shall be the curve-to-spiral point.

9.4.2.3 Cab Signal System

Functionality Overview

The cab signal received on-board the car shall be interpreted as a speed limit, the aspect of

which, shall be displayed to the operator.

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.

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 50