Maintenance Manual AC DC EMU (Siemens) PDF

CAMTECH/E/13-14/MM AC-DC EMU/1.0 1 CHAPTER 10 BRAKE SYSTEM 10.1 BRAKING SYSTEM The vehicle is equipped with several brake systems. Normally...

CAMTECH/E/13-14/MM AC-DC EMU/1.0 1 CHAPTER 10 BRAKE SYSTEM 10.1 BRAKING SYSTEM The vehicle is equipped with several brake systems. Normally, the joystick/brake lever (Master Controller) is used for braking the vehicle. This lever can also be used for a rapid application of the brakes in the event of an emergency. This system uses the EP brake system. To use this system in the best possible way, one Brake Control Unit (BCU) is provided per unit. The BCU controls the brake force of the units. If the BCU fails, the TCU will perform the functions of the BCU. An indirect brake, which can be operated via two automatic brake valves, serves as a fallback. One is used by the driver, the second one by the guard. The vehicle mainly uses the electric brake. With this brake, the generated brake force can be returned back into the contact line network (OHE). If the brake force cannot be fed into the network, the brake current is commutated to a brake resistance and the magnetic drag is reduced to 0 kN within 1 sec. As a next step, the electro-pneumatic brake takes over the magnetic drag. To secure the parked units, a spring-loaded brake has been installed. It acts on all 4 axles of the DTC/ NDTC. The brake can be applied or released via push buttons provided in the driver's cab. In the case of a fault, the spring-loaded brake is locked by an air shut-off cock. In this case, the driver has to release the brake by hand via the emergency release device. The pneumatic brake is already connected from 15 km/h (due to idle time of the EP brake). Furthermore, the electronic brake force is reduced depending on the speed (between 15 to 3 km/h). If the speed drops below 3km/h, the EP brake is automatically reduced. The term "special brake blending" refers to the proportional reduction of the electronic brake while the compressed-air brake is increased. Maintenance Manual for AC-DC EMU (Siemens) Chapter 10 2 CAMTECH/E/13-14/MM AC-DC EMU/1.0 Figure: Set-up of the EP unit Chapter 10 Maintenance Manual for AC DC EMU (Siemens) CAMTECH/E/13-14/MM AC-DC EMU/1.0 3 Figure: Set-up of the brake system DTC – MC – TC Maintenance Manual for AC-DC EMU (Siemens) Chapter 10 4 CAMTECH/E/13-14/MM AC-DC EMU/1.0 Figure: Set-up of the brake system NDTC – MC – TC Chapter 10 Maintenance Manual for AC DC EMU (Siemens) CAMTECH/E/13-14/MM AC-DC EMU/1.0 5 Solenoid valve Holding BP connection valve Manometer in the driver's cab Air reservoir Emergency Spring-loaded release Compressed- brake cylinder device air brake cylinder Figure: Overview of spring-loaded brake The spring-loaded brake is suitable for securing the units. It acts on the two bogies of the DTC / NDTC. Compressed air is required to release the brake. In the case of a broken or defect hose, the spring-loaded brake is applied automatically. However, this fault can be eliminated via the emergency release device, i.e. one funicular traction per spring-loaded brake on the bogie. It is no longer possible to apply the spring-loaded brake after a fault of this kind. In addition, the shut-off cock of the spring-loaded brake must always be shut-off for an emergency release. Shut-off cock of the spring-loaded brake Release device Figure: Shut-off cock of the spring-loaded brake and emergency release device Maintenance Manual for AC-DC EMU (Siemens) Chapter 10