No official Railway Board PDF has been traced for this entry yet. The text below was read from the document held in the library.
| Type | Commercial Circular |
|---|---|
| Topic | freight |
| Currency | Currency not verified |
conjunction with Normal Brake/Full Service Brake/Emergency Brake to develop brake
Brake Interface Unit (BIU) and Troubleshooting related to Kavach (All types BIU) TYPES OF ROLLING STOCKS AND BRAKING SYSTEMS 2 3 Brake systems IRAB KAVACH specific BIU Universal BIU CCB HHP CCB 1.5 CCB 2.0 E-70 BRAKING MECHANISMS Adhesion brakes Mechanical brakes Tread brakes (essential for safe ea . reliable rolling stock braking) - Axle-mounted disc brakes Wheel-mounted disc brakes Electric brakes V7] Dynamic brakes Regenerative brakes Non-adhesion brakes T Air resistance braking Rail brakes BP/FP Arrangement Brake Valves In IRAB A9 SA9 https://www.youtube.com/watch?v=WX1bW2LxeAo LEVELS OF COMMANDS 7 • Kavach shall be capable of three levels of brake commands for train braking – Normal Brake (BP : 4.4 +/- 0.1 kg/cm2 ) – Full Service Brake (BP : 3.6 +/- 0.1 kg/cm2 ) – Emergency Brake (BP : 0 +/- 0.1 kg/cm2 ) • On board Kavach shall also give additional command i.e. Loco Brake Command in conjunction with Normal Brake/Full Service Brake/Emergency Brake to develop brake cylinder pressure upto maximum value corresponding to loco independent brake, if the train is identified as light engine. Brake Interface Unit (BIU) Brake Interface: IRAB 9 IRAB Brake System Pressure Pressure Command Electrical Command Existing System w/o Kavach IRAB Brake System BIU Onboard Kavach System with Kavach • Electronic Module: • It consists of a Control Card having built-in air brake control logic. • Control Card interfaces with Analog Input Module, Digital Input Module & Digital Output Module to monitor and control air brake application/ release. • Pneumatic Panel: • It consists of different valves, pressure transducers and manual cocks - Interfaced with IRAB system & Electronic Module for brake control purpose. BRAKE INTERFACE UNIT Block diagram of Loco brake Interface Features of BIU • BIU works parallel to Locomotive brake system • Does not effect brake characteristics of locomotive/train • Can override the loco pilot braking and vice-versa-higher braking prevails • BIU initiated braking can not be reduced by loco pilot • Manual and automatic isolation possible 11 BIU-SA9 A9 Onboar d Kava Onboard Kavach 2-Control Pressure 3-Output Pressure 1-Input Pressure Logic: When 3 less than 2 then 3 is connected to 1. When 3 is more than 2 then 3 is connected to Ex. Independent Brake Operation BIU- A9 A9 Onboard Kavach 2-Control Pressure 3-Output Pressure 1-Input Pressure Logic: When 3 less than 2 then 3 is connected to 1. When 3 is more than 2 then 3 is connected to Ex. A9 Brake Operation BP & BC Development (FSB) BP & BC Development (FSB) BP & BC Development (EB) Locot+14 Coach LHB: BP & BC Development(EB) BP/BC in (bar) = he) on hm on wo — 0.5 Time in (s) 17 Block diagram of BIU of IRAB Note:- • LPSR: Low pressure sensor • 3/2 &2/2 – Electrically operated valves • 3/2 – Energized : o/p of LPSR given to IRAB • 3/2 – de-energized :LP command directly routed • EPC-BP : Electric Pneumatic controller for BP • 2/2 – energized to open • QRV – Quick release valve • DCV : double check valve A9 SA 9 A9-Em 5.5 5 Min (5.5,5) Max of I/p PNEUMATIC BRAKE SYSTEM 18 PNEUMATIC BRAKE SYSTEM: CONTD. 19 Brake Valves In E-70 Brake System SA9 A9 Brake Valves In E-70 Brake System Front View of E- 70 Rear View of E-70 Brake Interface: E-70 22 E-70 Brake System E-70 Brake System BIU (IRU) Onboard Kavach Electrical Command Existing System w/o Kavach System with Kavach E-70 BIU(IRU) Arrangement 23 oc Tretediucme SAD APPLY(MAX) 3.5 Kafoma न SUPPLY 8 TO 9.5 Kgfoma BAARKE PIPE 5.0 Kgfome 3.5 Egor कचकडाका fio 2 Mig ford Fem Baten 4 Feed bac Tae रु Wz VALE Transucee E * E SOLATING: Cote BRAKE INTERFACE UNIT HBL Power Systems Ltd.| eeeesaceoer: | ceectener: APPSOVED ay: PROJECT: E-70 Interfacing Scheme 25 E70 Interface Relay Unit (IRU) Interfacing Scheme 2. LE valve consist of a limiting valve and EP-LE valve to enable generation of required BC pressure during LE working Brake Valves In CCB – Brake System
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