American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 92)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-87 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

9.4.5.15 Environmental Requirements

All equipment shall meet the environmental provisions of the AREMA ATCS environmental

specifications and environmental requirements specified in these Contract Documents.

9.4.5.16 Power Supply

All housings shall be equipped with an external socket for the connection of a mobile

generator. Signaling power supplies shall not be used for any purpose other than to power

signaling equipment. In case of failure of the primary power source, backup power supply

shall be provided to ensure safe train operation as follows:

Vital equipment 4 hours minimum

Non-vital equipment 4 hours minimum

Switch machines 4 hours minimum at terminal interlocking

9.4.2.17 Lightning Protection

Lightning protection shall be provided for all equipment, which could be damaged by

electrical transients.

9.4.5.18 Design Integrity

The system shall be designed and operated in a safe manner. Failure of the system shall

not compromise the safety of train operation, road traffic or pedestrians.

Any circuit directly affecting the safety of train movement shall be considered “vital”. Circuits

performing functions of control, indication, communication, and other tasks, which do not

directly affect the safety of train movement, shall be considered “non-vital”.

All vital components shall be highly reliable, of proven design and have predictable failure

modes, such that no single failure shall create a less restrictive state.

The signal system logic and its components shall be designed to meet the following:

a) All vital components shall be designed so that restrictive (rather than permissive)

actions occur when a component fails.

b) All vital control logic shall be designed such that, if interrupted or de-energized, it

shall cause the controlled function to assume its most restrictive condition.

c) All relays or solid-state equivalents being energized by a vital circuit shall be vital

units. All contacts used within any vital circuit shall be contacts of vital relays.

d) All errors of hardware and software that may compromise vital data, whether stored

within a logical process, sampled as digital or analog inputs, or produced as digital

or analog output, shall result in a safe system state.

Non-vital circuits may use non-vital relay or solid-state technology. Failures of non-vital

equipment shall not affect the safety of the system. Non-vital systems shall interface with

vital systems in a manner, which isolates the vital systems from malfunctions of the non-vital

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 92