American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 77

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-72 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
extend the approach time to take account of the delay in dropping all gates. All gates shall
be individually monitored.
Crossing bell shall be an electronic type, conforming with AREMA Signal Manual, Part
3.2.61. The bell sound level shall be set to 77 dBa ±2 dBa at 10 feet in accordance with
AREMA Signal Manual, Part 3.2.61, unless ambient noise levels dictate otherwise. Where
an electronic processor is used for the crossing equipment, the design shall be such that the
end user may elect, by means of external wiring alteration and without logic redesign, to
silence the bells once all gates are horizontal. Such design shall prevent the bells from re-
activating as the gates rise.
Provide an 8-inch amber LED Motorman's Signal for each track, located on the normal
approach side of the crossing and facing trains approaching in the normal direction of traffic.
Each Motorman's Signal shall display a solid aspect when the crossing approach is
occupied and a flashing aspect when the gates are down and there is no detected
malfunction of the crossing system.
9.4.4.9 Track Switches
All track switches shall be powered and interlocked. They shall normally be set and locked
automatically. All route-setting functions shall apply. An over-switch (OS) track circuit shall
be provided, occupation of which shall prevent powered movement of the switch.
A manual switch setting facility shall be provided at powered switch locations. The placing of
a powered switch into manual operation shall result in loss of indication. Signals shall revert
to their most restrictive aspect in the event of loss of indication of switch position.
Switch and lock mechanisms shall meet or exceed the recommendations of the AREMA
Manual of Recommended Practices–Signals. The electrical, electromechanical or
mechanical locking equipment shall prevent switch point movement when the switch points
are in full normal or full reverse position. Three-phase operated switch machines shall be
avoided unless exceptional site conditions (e.g. distance from control point) dictate use of
same.
Parts of switch operating layouts shall be interchangeable between similar layouts.
9.4.4.10 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.
9.4.4.11 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.
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