Summary of Contents for Hitachi ATT-20
- Page 1 SM 6299 1000 Technology Drive, Pittsburgh, PA 15219 645 Russell Street, Batesburg, SC 29006 ATT-20 Audio Track Transceiver STS USA Part Numbers N454052-3901 through N454052-3906 Installation Operation Troubleshooting...
- Page 2 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019...
- Page 3 STS USA spare parts are used as replacements. © Property of Hitachi Rail STS USA, Inc., 2019 all rights reserved– the copying, reproduction and use of this work in any form whatsoever is forbidden without the written authorization of Hitachi Rail STS USA, Inc.
- Page 4 Revised Figure 1-1 and Figure 6-1 to add R14 and label. Revised Table 6-4 December 2015 and Figure 6-1 for items 126 and 127. Revised Table 6-5 to correct ATT-20 Unit part numbers. March 2019 Hitachi Rail STS Branding Copyright 2019...
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Page 5: Table Of Contents
4.3. General Checks ........................4-1 4.4. Shunt Mode Checks ......................... 4-1 4.5. Series Mode Checks ......................... 4-3 SHOP MAINTENANCE ........................5-1 PARTS LISTS ............................ 6-1 6.1. ATT-20 Audio Track Receiver Kits ................... 6-1 Copyright 2019 SM 6299 Rev. 3, March 2019... - Page 6 ATT-20 Audio Track Transceiver 6.2. ATT-20 Audio Track Transceiver Units ..................6-1 6.3. ATT-20 Audio Track Receiver Parts List .................. 6-2 6.4. Cable Compensating PCB Parts List ..................6-5 RAIL TEAM AND TECHNICAL SUPPORT ..................7-1 List of Figures Figure 1-1.
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Page 7: General Information
This manual provides application, installation and maintenance information for the STS USA Audio Track Transceiver, Model ATT-20. The ATT-20 is a short-range transceiver operating in the audio frequency range of 12 to 20 KHz. The high frequency range was chosen to provide sharp block definition. The ATT-20 can be used in applications such as highway crossings, island circuits, switch lock release and general train detection in non-electrified and DC electrified territories. -
Page 8: Transceiver Characteristics
ATT-20 Audio Track Transceiver 1.3.2. Transceiver Characteristics CAUTION The ATT-20 may be operated from a constant potential rectifier (CPR) supply, batteries floating on a CPR, or an electronically regulated supply. Regardless of the supply used, a surge ripple filter (STS USA N451590-0301) must be used between the supply and the ATT-20 Transceiver. -
Page 9: Miscellaneous
ATT-20 Audio Track Transceiver 1.3.4. Miscellaneous Reverse battery protection: Built-in Operating temperature range: - 40°C to +70°C Maximum block length: shunt mode at 3 ballast; 150 ohm/1000 ft. series mode at 3 ohms/1000 ballast. Recommended Relay: PN-150B, 400 ohm coil, (STS USA N322500-... - Page 10 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019...
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Page 11: Application, Installation, And Adjustments
APPLICATION, INSTALLATION, AND ADJUSTMENTS 2.1. General This section provides information on the application of the ATT-20, as well as installation and adjustment procedures for the ATT-20 and related equipment. It is also critical that this section be read in its entirety prior to any application considerations. -
Page 12: Series Mode Track Circuit Application
In this application, the transmitter and receiver are wired in sequence via a jumper on the ATT-20 unit. This jumper connects transmitter output terminal 4 to the receiver input terminal 6. The remaining transmitter output lead (terminal 3) and the remaining receiver lead (terminal 5) are twisted as a pair and each is connected to its respective rail (see Figure 2-2). -
Page 13: Terminal Connections
• Use higher frequency units when less ring-by is desired. • Provide lightning protection per Section 2.9. • The relay recommended to be used with ATT-20 is a vital PN-150B, STS USA No. N322500-701, 400 ohm, plug-in type. Copyright 2019... -
Page 14: Shunt Mode Operation
500 ft. Also, do not exceed block lengths of 300 ft. 2. Connect terminals 7 (relay +) and 8 (relay -) to the relay. The recommended relay to be used with the ATT-20 is a PN-150B, 400 ohm plug-in type, STS USA Part No.: N322500-701. -
Page 15: Shunt Mode Adjustment
The resistance of the adjustment shunt must accurately represent the desired shunting sensitivity. 2. Adjust the ATT-20 transmitter output level through the access hole in the top cover until the relay is energizes. 3. Remove the hard-wire shunt from the rails. -
Page 16: Series Mode Installation
ATT-20 Audio Track Transceiver 2.8.1. Series Mode Installation Refer to Figure 2-2 and proceed as follows to install the ATT-20 in a series mode application: 1. Connect a jumper strap between terminals 4 and 6 on the ATT-20 when the total single conductor cable length from the ATT-20 to the track is less what appears in Table 2-3 below. -
Page 17: Series Mode Adjustment With Cable Compensating Pcb
3. Remove the hardwire shunt from the rails. The adjustment procedure is complete. 2.8.3. Series Mode Adjustment with Cable Compensating PCB Proceed as follows to adjust the ATT-20 in a series mode, with cable compensating PCB installation: 1. Place a zero ohm shunt across the track connections at the feed end. - Page 18 ATT-20 Audio Track Transceiver Zener diodes for suppression of low voltage transients. The STS USA part no. is N451552-0525. The surge ripple filter consists of a series line inductor and a four-terminal capacitor with a selenium suppressor diode across its terminals. The four-terminal capacitor guarantees loss of power to the load should one of the capacitor leads or plates open.
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Page 19: Figure 2-3. Lightning Arrester And Surge Ripple Filter For Shunt Mode Application
ATT-20 Audio Track Transceiver TRACK TRACK USSP-21 USSP-21 TRANSMITTER RECEIVER ATT-20 RELAY SURGE RIPPLE FILTER (N451590-0301) LIGHTNING ARRESTER PART NO. N451552-0101 BATTERY TWISTED PAIR POWER SUPPLY Figure 2-3. Lightning Arrester and Surge Ripple Filter for Shunt Mode Application Copyright 2019... -
Page 20: Figure 2-4. Lightning Arrester And Surge Ripple Filter For Series Mode Application
ATT-20 Audio Track Transceiver TRACK USSP-21 RECEIVER TRANSMITTER ATT-20 RELAY TWISTED PAIR LIGHTNING ARRESTER PART NO. N451552-0101 BATTERY POWER SUPPLY Figure 2-4. Lightning Arrester and Surge Ripple Filter for Series Mode Application Copyright 2019 SM 6299 Rev. 3, March 2019... - Page 21 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019 2-11...
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Page 23: Functional Description
It then amplifies and rectifies this signal to provide a DC output which drives the relay coil. The functional description of the ATT-20 applied to the shunt track circuit is covered in Section 3.2. Section 3.3 covers the series mode track circuit. -
Page 24: Receiver
ATT-20 Audio Track Transceiver Resistor R15 and R19 form a voltage divider which sets the bias for transistor Q4. Capacitor C12 bypasses resistor R19. Transistors Q4, Q5, Q6 and Q8 make up a unity gain with low output impedance. Diodes D4, D5, D6 and D8 - along with... -
Page 25: Figure 3-1. Transmitter Pcb Schematic Diagram
ATT-20 Audio Track Transceiver 1-1/2 A .01uf VSK130 POWER 2N3117 1328T 332T 2N3117 820K 1.0uf .01uf 47uf 5.1K 390K .15uf LVA450 1N914 2N3117 2N2270 .22uf 2N6059 1N914 3.6M SHUNT 1N914 5.1K .47uf TRACK 3.3K TAB. TAB. 6.8uf .47uf 100uf 2N3964... - Page 26 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019...
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Page 27: Figure 3-2. Receiver Pcb Schematic Diagram
ATT-20 Audio Track Transceiver POWER 47uf 2N3117 TRACK 2N3117 TAB. 2N3117 2N2270 1N4936 .02uf TAB. TAB. .15uf 2N2270 TAB. 10uf 1N4003 .01uf 1N914 1N4003 .0033uf 200K TAB. 1.5K 1N4003 10uf TRACK LVA462 .1uf 1.8K 240K 2N3117 2N3117 LVA450 .027uf 2N2270 270K .027uf... - Page 28 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019...
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Page 29: Field Maintenance
These procedures should also reveal whether the fault is in the ATT-20 or a related unit or circuit. If fault lies with the ATT-20, the ATT-20 should be replaced with a new unit. When installing the new unit, please make certain to follow all installation procedures outlined in Section 2. -
Page 30: Figure 4-1. Att-20 Test Circuit For Shunt Mode Application
RELAY Figure 4-1. ATT-20 Test Circuit for Shunt Mode Application The tests performed in Section 4.4 verify proper operation of the ATT-20 unit in a shunt mode application. If the track circuit installation still does not work properly, troubleshoot the cabling, connections, and peripheral equipment associated with the track circuit. -
Page 31: Series Mode Checks
If the relay connections are good, replace the ATT-20 with a unit of the same frequency and then repeat steps 1 and 2. If the relay still does not energize, replace the relay with another... - Page 32 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019...
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Page 33: Shop Maintenance
ATT-20 Audio Track Transceiver SHOP MAINTENANCE STS USA recommends that faulty ATT-20 units be returned to the factory for shop level testing and repair. Both the transmitter and receiver must undergo special PCB’s testing, calibration, and component replacement (per frequency) procedures. See Section 7 for contact information. - Page 34 ATT-20 Audio Track Transceiver Copyright 2019 SM 6299 Rev. 3, March 2019...
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Page 35: Parts Lists
ATT-20 Audio Track Transceiver PARTS LISTS 6.1. ATT-20 Audio Track Receiver Kits Each kit consists of a complete ATT-20 unit for series mode application and the Cable Compensating PCB. Table 6-1 lists the kit part numbers. Table 6-1. ATT-20 Unit Kits... -
Page 36: Att-20 Audio Track Receiver Parts List
ATT-20 Audio Track Transceiver 6.3. ATT-20 Audio Track Receiver Parts List Table 6-4 and Table 6-5 contain parts lists for ATT-20 Audio Track Transceiver units N451052-3901 through -3906. Refer to Figure 6-1 for the component locations. The internal wring diagram is shown in Figure 6-2. - Page 37 ATT-20 Audio Track Transceiver Table 6-5. ATT-20 Part Tabulation CHASSIS XMITTER PCB RCVR PCB ATT-20 Unit Freq. (KHz) Application Item 5 Item 15 Item 20 N451052-3901 12.28 Shunt R451053-6302 N451605-6402 N451605-6502 N451052-3902 Shunt R451053-6302 N451605-6403 N451605-6503 N451052-3903 Shunt R451053-6302 N451605-6404...
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Page 38: Figure 6-1. Att-20 Parts Illustration
ATT-20 Audio Track Transceiver COMP. SIDE COMP. SIDE 55 50 BATTERY RELAY LOWER RAISE RELAY VOLTS AUDIO TRACK TRANSCEIVER SHUNT MODEL,ATT-20 MODE UNIT PC.NO. SER.NO. FREQ. REV. Figure 6-1. ATT-20 Parts Illustration Copyright 2019 SM 6299 Rev. 3, March 2019... -
Page 39: Cable Compensating Pcb Parts List
POWER POWER SHIELD XMITER PCB RCVR PCB Figure 6-2. ATT-20 Wiring Diagram 6.4. Cable Compensating PCB Parts List Refer to Table 6-6 and Figure 6-3 for Cable Compensating PCB, STS USA N13100201, parts, parts layout, and schematic diagram. Table 6-6. -
Page 40: Figure 6-3. Cable Compensating Pcb Parts Layout And Schematic Diagram
ATT-20 Audio Track Transceiver Figure 6-3. Cable Compensating PCB Parts Layout and Schematic Diagram Copyright 2019 SM 6299 Rev. 3, March 2019... -
Page 41: Rail Team And Technical Support
ATT-20 Audio Track Transceiver RAIL TEAM AND TECHNICAL SUPPORT The Rapid Action Information Link Team (RAIL Team) is a group of experienced product and application engineers ready to assist you to resolve any technical issues concerning this product. Contact the RAIL Team in the United States at 1-800-652-7276 or by e-mail at railteam@hitachirail.com. - Page 42 ATT-20 Audio Track Transceiver End of Manual Copyright 2019 SM 6299 Rev. 3, March 2019...