Type AT Signal - Alstom

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Introduction 1.3.1. Housing The signal housing is of cast-aluminum construction. Access to the internal parts of the signal is made through a hinged door at the rear of the housing. The Type AT 3 Aspect Signal is internally divided into four potentially active light compartments. Three compartments are used for aspect signals and one for the number display (number plate, illuminated (incandescent) number or LED number). The door of the three Aspect signal is equipped with two ventilators to prevent moisture and heat build-up within the housing and a gasket with sealant to prevent water from entering the housing. The Type AT Single Aspect Signal is available with or without an enamel number plate. The single aspect door has one ventilator. A latch is provided to padlock the door and prevent unauthorized access. Housings can be stacked to make 4, 5, 6, 7, or 8 aspect configurations. VENTILATORS 4 COMPARTMENTS IN A 3 ASPECT SIGNAL NUMBER PLATE Figure 1-2. Typical Three Aspect and Single Aspect Type AT Signal Housings, Side View P2502, Rev. Apr/08 1–4 Alstom Signaling Inc.
` Introduction Table 1–1. Type AT Signal Basic Housing Dimensions Dimension 3 Aspect Single Aspect Height 28.75" (73 cm) 9.75" (24.8 cm) Width 8.60" (21.8 cm) 8.60" (21.08 cm) Depth 9.69" (24.6 cm) 9.69" (24.6 cm) Outer Lens Diameter 5.0" (12.7 cm) 5.0" (12.7 cm) 1.3.2. Lens Assembly The lens assembly of a Type AT Signal aspect, whether incandescent or LED, consists of a colored (Green, Yellow, or Red) lens and a mounting ring that holds the lens to the signal case. See Figure 1–3 for lens detail. LENS GASKETS LAMPS AND LAMP RECEPTACLES (2) LENS GASKETS LED LAMP UNIT TERMINAL POSTS BEZEL RING BEZEL RING LED UNIT OUTER LENS SCREW & WASHER GASKET LIGHTING TRANSFORMERS TERMINALS OUTER LENS SCREW & WASHER TYPE AT SINGLE ASPECT INCANDESCENT SIGNAL GASKET CENTERLINE OF OUTER LENS & LAMP UNIT LENS LED LAMP UNIT MOUNTING SCREW & WASHER TYPE AT SINGLE ASPECT LED SIGNAL Figure 1–3. Typical Type AT Signal Active Light Compartment P2502, Rev. Apr/08 1–5 Alstom Signaling Inc.
Page 1: Type AT Signal Copyright © 2008 Al
Page 5 and 6: LIST OF EFFECTIVE PAGES P2502, Type
Page 7 and 8: PREFACE NOTICE OF CONFIDENTIAL INFO
Page 9 and 10: ABOUT THE MANUAL This manual is int
Page 11 and 12: MANUAL SPECIAL NOTATIONS In the Als
Page 13 and 14: Topic TABLE OF CONTENTS Page 1. SEC
Page 15 and 16: Description LIST OF FIGURES Page Fi
Page 17 and 18: Description LIST OF TABLES Page Tab
Page 19 and 20: Introduction 1. SECTION 1 - INTRODU
Page 21: Introduction 1.3. PHYSICAL CHARACTE
Page 25 and 26: Introduction 1.5. LED LIGHT SOURCE
Page 27 and 28: Theory of Operation 2. SECTION 2- T
Page 29 and 30: Theory of Operation 2.3.1. Type AT
Page 31 and 32: Theory of Operation 2.4.1. LED Lamp
Page 33 and 34: Theory of Operation Figure 2-5 is a
Page 35 and 36: Installation 3. SECTION 3 - INSTALL
Page 37 and 38: Installation Figure 3-2. Typical Ce
Page 39 and 40: Preventive Maintenance 4. SECTION 4
Page 41 and 42: Preventive Maintenance 4.2.1. Inspe
Page 43 and 44: Preventive Maintenance Table 4-3. E
Page 45 and 46: Preventive Maintenance 4.2.4. Signa
Page 47 and 48: Troubleshooting 5. SECTION 5 - TROU
Page 49 and 50: Troubleshooting SIGNAL ASPECT DIM O
Page 51 and 52: Corrective Maintenance 6. SECTION 6
Page 53 and 54: ` Corrective Maintenance 6.3. LENS
Page 55 and 56: Corrective Maintenance 6.5. LAMP RE
Page 57 and 58: Corrective Maintenance Table 6-6. A
Page 59 and 60: Corrective Maintenance 6.8. SIGNAL
Page 61 and 62: Corrective Maintenance 6.9. WAYSIDE
Page 63 and 64: Corrective Maintenance 7. SECTION 7
Page 65 and 66: 7.3. LENSES Corrective Maintenance
Page 67 and 68: Corrective Maintenance 7.4. SINGLE
Page 69 and 70: Corrective Maintenance THIS PAGE IN
Page 71 and 72: Corrective Maintenance Table 7-3. E
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Corrective Maintenance 7.6. 3 ASPEC
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Corrective Maintenance Table 7-4. E
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Parts Catalog Table 7-5. Example 3
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7.8. LED UNITS Parts Catalog Figure
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Parts Catalog 7.9. 2 ASPECT TYPE AT
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Parts Catalog 7.10. 7 ASPECT TYPE A
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Parts Catalog Table 7-8. Example7 A
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Parts Catalog 7.11. 3 ASPECT TYPE A
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Parts Catalog THIS PAGE INTENTIONAL
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Drawings G Y R ILLUMINATED NO. PLAT
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Drawings A.3. TYPE AT SIGNAL UNIT W
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Drawings G 1 2 Y 1 2 R 1 2 20 1 2 x
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Drawings THIS PAGE INTENTIONALLY LE
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Type AT Signal - Alstom

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