Transcript
Ansaldo STS USA
Signals and Associated Equipment
RSE-7A1 Rev. 4-07
LED Signals: General Information ASTS USA’s new LED Colorlight Signal provides superior performance compared to incandescent signals and important advantages over other brands of LED signals. Among its many features, LED technology extends wayside signal life well beyond that of the incandescent design and requires much less operating power. Non-ASTS USA LED signal models are designed to perform like incandescent signals to enable operation from conventional lamp driver circuits. In contrast, ASTS USA’s signal operates from an external constant-current source and allows for much more accurate monitoring of LED unit operation. Used ® in concert with the LED 12 board in MicroLok II systems or the MicroLok Object Controller (OC), high precision “lamp”-out detection as well as routine hot/cold “filament” checking is provided. The LED signal can also be applied in a failover-tored configuration to ensure display of a red aspect in the event of a signaling system shut down. General Description ASTS USA LED signals can be provided as part of new railroad or transit signal assemblies, or as retrofit units for existing signal assemblies, and are available with 8-3/8” or 6-3/8” diameter lenses. Color options include red, green yellow and lunar white. (Refer to RSE-7A2 for design details of the basic signal unit assembly.) ASTS USA LED signals are compliant with all applicable AREMA C&S Manual specifications, and are designed to withstand the full range of railway environmental extremes. In addition to standard 3aspect colorlight assemblies, LED signal units can be adapted for other uses such as switch machine position indicators or highway crossing approach indicators (train crew warning). Application Notes Operation from MicroLok II or MicroLok Object Controller ASTS USA LED signals are designed to be controlled from MicroLok II-based systems or the OC-4000 series of the MicroLok Object Controller (OC). MicroLok II systems incorporate a special “LED 12” vital plug in PCB for this purpose; this board is capable of driving up to 12 LED units. OC-4000 units contain an internal LED-compatible PCB that can operate up to 6 units.
For additional information, contact your ASTS USA Account Executive.
These MicroLok II/OC configurations provide for highly reliable light-out detection and constant hot and cold “filament” checking of the LED signal unit. Unlike other signals, ASTS USA LED units do not incorporate vital circuitry; vitality is contained entirely in the LED 12 PCB or OC internal LED driver PCB. MicroLok II and OC outputs are also designed to prevent any transient signals from generating false commands to the signal units. Both the MicroLok II and OC also provide event logging of routine signal controls and any associated errors or anomalies. The MicroLok II Development System has been modified to accommodate application software programming for LED signal operation. Operating Power (Constant Current Regulator Applications) As with other MicroLok II vital output PCBs, an external Vital Cut-Off Relay (VCOR) is used to control power to LED 12 PCB outputs and remove this power in the event of a critical fault. The OC uses an internal Conditional Power Supply (CPS) output that mimics the VCOR function. ASTS USA LED signals do not obtain power directly from signal battery. Instead, a Constant Current Regulator unit delivers a specially regulated output current for driving the LED signals. Battery power is applied to the Regulator under control of the MicroLok II VCOR or OC CPS output. The output of the Regulator includes both open and short circuit protection. One regulator is required for each “ON” ASTS USA LED Signal in the system, however a regulator can be shared
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Ansaldo STS USA
LED Signals: General Information
RSE-7A1 Rev. 4-07
Basic Configuration Using MicroLok II LED 12 PCB
Basic Configuration Using MicroLok Object Controller
LED SIGNAL UNIT
MICROLOK® II CARDFILE
CPS
FIELD WIRING
VCOR
CCR
LED 12 PCB
BATT
DRIVER PROTECT. PCB
GND
FIELD WIRING
MICROLOK® OBJECT CONTROLLER
BATT LED PROTECT PCB
LED SIGNAL UNIT
CCR
GND
DRIVER PROTECT. PCB CPS LED PROTECT PCB
Application Notes (cont’d)
Installations with Non-ASTS USA Equipment
between signals that will never be on at the same time. Various configurations of LED signal and Regulator units are possible to optimize equipment usage, power load/common sharing, cable sizes, etc. These are described in the service literature included with the unit. Refer to RSE-7A2 for additional information on the Constant Current Regulator.
Note: MicroLok II and OC systems are not designed to operate non-ASTS USA LED signals using their LED output channels. ASTS USA LED signals can be operated using non-ASTS USA controllers, however a dedicated signal-lighting relay circuit is required. This configuration would not retain the light-out and filament-check features of the MicroLok II/OC-based signal systems (contact ASTS USA for additional information).
Failover to Red Option The basic MicroLok II/OC system configuration for driving ASTS USA LED signals does not provide for failover to a red aspect in the event of a system shutdown. However, in MicroLok II applications this function can implemented using an additional “standby” Regulator and selected VCOR contacts to independently light the red aspect. In OC applications, a separate vital relay can be used for failover. Contact your ASTS USA Account Executive for additional details.
Driver Protection Board ASTS USA’s Driver Protection Board provides a high degree of surge protection, from surges induced on the LED signal’s field wiring connections, for the MicroLok II LED 12 PCB or OC unit internal circuits. This unit is typically mounted on an entrance panel and designed for standard AREMA (AAR) terminal spacing. Two versions allow for left or right-hand termination of field wiring and house/case wiring. Catalog RSE-7A2 provides additional information on this board.
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Misc. Electrical ASTS USA LED signal circuits require standard lightning and surge protection equipment to prevent signal unit damage and possible false commands (see catalog sections RSE-3H2 and RSE-3H3). However, fuses are not needed/recommended on the signal outputs; the Constant Current Regulator output includes short-circuit protection. The ASTS USA Common-Mode Filter is recommended for battery line protection (see RSE-3H4). No damage will occur to the system if an output is inadvertently shorted to ground. Twisted-pair wiring (two to three turns per foot) is typically used to minimize possible noise on LED output wiring. Slidewire resistors and series-resistance dimming equipment are not required or advised.
LED Signals: General Information
Ansaldo STS USA RSE-7A1 Rev. 4-07
Advantages
System Installation Specifications (cont’d)
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Battery Line Filtering:
ASTS USA Common-Mode Filter (see RSE-3H4)
Fuses:
Not required on LED signal outputs
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Exceeds longevity and reliability of conventional incandescent signals; Low power consumption compared to incandescent signals; Provides highly accurate signal unit monitoring features (e.g. “filament” check) not available in nonASTS USA LED signals;
Permitted for VCOR to B12 Slide-Wire Resistors:
Not required or advised
Wire Lengths:
From house/case: See Table 1
Can be operated by any MicroLok II-based vital system or MicroLok Object Controller; Complies with signaling industry light projection standards; Constant Current Regulator unit assures proper and protected operating voltage;
Unit Specifications and Additional Information
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Driver Protection Board guards against surge voltages in field wiring;
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Failover-to-red option easily implemented
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No slide wires or fuses required.
System Installation Specifications System-to-Signal Wiring: Twisted-pair (2 to 3 turns/ft.)
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Refer to catalog section RSE-7A2 for detailed technical information on ASTS USA’s LED signal unit and supporting equipment. Contact your ASTS USA Account Executive for specific LED signal application possibilities. Refer to RSE-7B1 and RSE-7B2 for ASTS USA multi-purpose and transit colorlight signal assemblies. Request ASTS USA Service Manual SM-6800N for additional LED design and installation information.
Separate bundles for input and output wiring (6” separation, min.) Surge Protection:
Line-to-line and line-toground ASTS USA USGA Lightning Arresters (see RSE-3H2)
MicroLok® is a registered trademark of Ansaldo STS USA, Inc.
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