New York Air Brake Corporation a Knorr Brake Company
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NEW YORK AIR BRAKE CORPORATION A KNORR BRAKE COMPANY 748 Starbuck Avenue, Watertown, New York 13601 C.W. 278 COMPONENT WRITE-UP OF BRAKE CONTROLLER P/N 775292 ISSUE NO. 1 C.W. 278 DATE: APRIL 1, 1998 8 PAGES NEEDS TO BE REVIEWED FOR CONTENT (UPDATED) 4-22-98 Purpose The Brake Valve Controller is a 'desktop' arranged device used by the engineer to control the application and release of train brakes (Automatic Brake Lever) or locomotive brakes (Independent Brake Lever) by sending a frequency signal to the Computer. No direct pneumatic action is taken other than initiation of an emergency brake application when the auto handle is placed in the emergency position. Operation A. The Brake Valve functions to indicate to the Computer the handle positions. No direct action is taken other than initiation of an emergency brake application. B. Refer to Figure 1. The 'knob' type handle, located to the right, is the INDEPENDENT BRAKE lever and is detented in only the 'release' position. Movement of the handle away from the operator will command the computer, via a fiber optic link, to apply the independent brake fully variable from 'min' to 'max' application. The independent brake may be released in a like manner by pulling the handle toward the operator. C. The 'BAIL-OFF' feature is activated by depressing the button the 'knob' on the independent brake lever or by depressing the button in the automatic brake lever. Lifting up on the lower portion of the knob, when the independent handle is in release position, will release the brake cylinder pressure, if an auto application is in affect. When the handle is in an application zone, the brake cylinder pressure will be reduced to the value corresponding to the position of the independent handle, if the auto application is higher than the selected independent value. For example: 1. A 10 psi reduction in brake pipe will equal 25 psi brake cylinder and a 30 psi independent application will equal 30 psi brake cylinder. When bail off knob is lifted brake cylinder pressure will remain at 30 psi. 2. A 20 psi reduction in brake pipe will equal 50 psi brake cylinder and a 20 psi independent application will equal 20 psi brake cylinder. When bail off knob is lifted brake cylinder pressure will reduce to 20 psi. - 1 - NEW YORK AIR BRAKE CORPORATION A KNORR BRAKE COMPANY 748 Starbuck Avenue, Watertown, New York 13601 C.W. 278 COMPONENT WRITE-UP OF BRAKE CONTROLLER P/N 775292 ISSUE NO. 1 C.W. 278 DATE: APRIL 1, 1998 8 PAGES - 2 - D. The 'T' type handle, located to the left, is the AUTOMATIC BRAKE lever. The automatic brake's fiber optic output signal, commands the computer to maintain the desired level of pressure in the brake pipe trainline. The automatic brake lever has all the same detented positions as are found on the standard 26C type brake valve. When pushed to the extreme forward detented emergency position (away from the operator), a Vent Valve, mounted on the rear of the controller, is mechanically forced open to exhaust #21 pipe initiating an emergency brake application. E. Redundant sensors are incorporated to provide failure protection. Some of these protections are as follows: 1. Loss of Independent brake signal results in no variable brake application only a maximum application or a full release is commanded due to the limit switches. When the handle is moved out of release position a maximum brake will occur. 2. Loss of automatic brake signal results in reduction of ER to zero psi at a service rate. An emergency brake application does not occur. 3. Redundant brake pipe cut-off and power knock-out when the automatic brake lever is in the emergency position. 4. Redundancy in the automatic brake release command position assures train brakes are not inadvertently released. F. Figure C.W. 278-1 shows the wiring schematic of the Brake Valve. Handle Positions The Automatic Brake Lever has six handle positions, arranged from the closest to the operator, (RELEASE), to the farthest away from the operator, (EMERGENCY), as shown in Figure C.W. - 247, which perform the following functions. A. Release (Running) Position (REL) In this position a frequency is indicated to the computer to charge the equipment and release the locomotive and train brakes. It is located with the handle moved to the first detent in the extreme backward position (toward the operator). B. Minimum Reduction Position (MIN) With the Brake Valve Controller handle moved to this position, a frequency is indicated to the computer to obtain a minimum brake pipe reduction (5 to 7 psi ). It is located in the detent forward of release position C. Service Position In this position a variable frequency is indicated to the computer to obtain a service brake application dependent on the position of the handle, in the sector from minimum service to full service. When in the 'FS' position (second detent position) of this sector, a full service brake application is commanded. D. Suppression Position (SUP) In addition to providing a full service brake application as with the brake valve controller handle in full service position, suppression of a penalty brake application is indicated to the computer. It is located in the third detent position. NEW YORK AIR BRAKE CORPORATION A KNORR BRAKE COMPANY 748 Starbuck Avenue, Watertown, New York 13601 C.W. 278 COMPONENT WRITE-UP OF BRAKE CONTROLLER P/N 775292 ISSUE NO. 1 C.W. 278 DATE: APRIL 1, 1998 8 PAGES E. Handle Off Position (HO) This is the position (fifth detent position) in which the handle is placed, when setting up a locomotive to operate in a trailing or non-controlling mode or when being towed "dead" in a train. In this position, equalizing reservoir on this locomotive is commanded too vent to atmosphere in preparation for setting up for another mode of operation. F. Emergency Position (EMERG) This position is located farthest away from the operator. An electrical and pneumatic emergency brake application is initiated. This position must be used for making brake valve emergency brake applications and for resetting after any emergency resulting from any cause other than a brake valve initiated emergency brake application. VENT VALVE ASSEMBLY (Item 2) A. A #21 Pipe Vent Valve is mounted directly to the Brake Valve Controller. When the Automatic handle is placed into the emergency position, a plunger in the brake valve controller contacts the mushroom head of the vent valve. The vent valve opens and vents #21 Pipe, initiating an emergency brake application causing brake pipe to vent to atmosphere at the PCU. - 4 - NEW YORK AIR BRAKE CORPORATION A KNORR BRAKE COMPANY 748 Starbuck Avenue, Watertown, New York 13601 C.W. 278 COMPONENT WRITE-UP OF BRAKE CONTROLLER P/N 775292 ISSUE NO. 1 C.W. 278 DATE: APRIL 1, 1998 8 PAGES REVISION PAGE: C.W. 278 ISSUE NO. 1 Original Issue DATE: APRIL 1, 1998 - 5 - NOMENCLATURE FOR FIGURE C.W. 278-2 AE1 AUTOMATIC EMERGENCY SWITCH NO.1, N.C. AE2 AUTOMATIC EMERGENCY SWITCH NO.2, N.O. AP AUTOMATIC VARIABLE HANDLE POTENTIOMETER AR AUTOMATIC RELEASE SWITCH, N.O. AUTO AUTOMATIC BLK BLACK BO1 BAIL OFF BUTTON, N.O. AUTOMATIC BO2 BAIL OFF BUTTONM, N.O. INDEPENDENT BVJ1 BRAKE VALVE EXTERNAL CONNECTORS BVJ2 BRAKE VALVE EXTERNAL CONNECTORS CRU COMPUTER RELAY UNIT CS/HO CONTINUOUS SERVICE/HANDLE OFF DI DIGITAL INPUT DO DIGITAL OUTPUT FOJ1 AUTOMATIC FIBER OPTIC EXTERNAL CONNECTOR FOJ2 INDEPENDENT FIBER OPTIC EXTERNAL CONNECTOR FOR PCB FIBER OPTIC RECEIVER PCB IM INDEPENDENT MAXIMUM APPLIED SWITCH, N.O. IND INDEPENDENT I/O INPUT/OUTPUT IP INDEPENDENT VARIABLE HANDLE POTENTIOMETER IR INDEPENDENT RELEASE SWITCH, N.O. J1-J10 PCB INTERNAL CONNECTORS PCB PRINTED CIRCUIT BOARD PCU PNEUMATIC CONTROL UNIT SH. SHEET SHLD SHIELD SS1 PCB DIGITAL I/O PCB TB TERMINAL BOARD WHT WHITE • CONTACT CLOSED ° CONTACT OPEN BAIL OFF SWITCHES BO1 BO2 NORMAL ° ° BAIL • • 2 POSITION. MOMENTARY, LIFT IND MODULE IR IM RELEASE • ° SERVICE ZONE ° ° MAXIMUM ° • AUTO MODULE AR AE1 AE2 RELEASE • • ° MIN ° • ° SERVICE ZONE ° • ° SUPP ° • ° CS/HO ° • ° EMER ° ° • FIGURE C.W. 278 BRAKE VALVE CONTROLLER 772502 UNITS 1 THRU 75 -7- FIGURE C.W. 278-1 BRAKE VALVE CONTROLLER 773361 UNITS 76 AND UP -8- FIGURE C.W. 278-2 BRAKE VALVE SCHEMATIC -9- C.W. 278 WRITTEN BY: SCOTT MARGESON REVISION DATE: ARPIL 1, 1998 ISSUE NO. 1 APPROVED BY: Project Engineer Date: Technical Publications Date: .