American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 56)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-51 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

9.4.2.13 Traction Return Bonding

The design shall provide impedance bonds and running rail continuity and cross bonding

sufficient to comply with the traction return power requirements.

The design shall ensure that no single failure, including broken rail or loss of a bonding

cable, shall result in loss of traction return capability through loss of continuity or failure due

to overheating.

Traction power return capability shall be provided on all tracks regardless of whether OCS is

present or not.

9.4.2.14 Event Recorders

AREMA recommended event recorders shall be provided for vital systems, including grade

crossings, to record changes in state of the vital systems and their devices.

Each recorder shall be capable of recording up to 1 week of events. Each recording device

shall provide access to the data through a standard USB interface port.

9.4.2.15 Environmental Requirements

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

specifications and environmental requirements specified in these Design Criteria.

9.4.2.16 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:

Grade crossings 8 hours minimum

Vital equipment 4 hours minimum

Non-vital equipment 4 hours minimum

Switch machines 4 hours minimum at terminal and junction

interlocking

9.4.2.17 Lightning Protection

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

electrical transients.

9.4.2.18 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”.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 56