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Sibas 32 control technology for rail vehicles is based on a modular structure and includes control units, such as the traction control unit or the central control unit, as well as input and output stations, such as driver’s cab terminals and process I/Os.
The devices are connected to the vehicle and train bus and their ability to communicate makes them literally the leader among control systems.
Sibas 32 control units - Structure and functionsThe control units of the Sibas 32 system comprise a number of different modules and are responsible for providing open-loop and closed-loop control, protecting onboard equipment near the converters, and performing control and information tasks on a higher overall level.
In addition to these functions, there are integrated systems for vehicle diagnostics and for maintenance and commissioning support.
Apart from using prefabricated standard units, the system also includes control units to which modules can be added whenever necessary in order to perform more complex control and drive tasks. A wide variety of modules with different voltage ranges is available to deal with the many different tasks involved in vehicle control.
Sibas 32 control units- Central control unit - CCU
- Traction control unit - TCU
- Sitrac - Traction control
Central control unit - CCUCentral control units (CCUs) perform higher-level control and monitoring tasks in the vehicle, such as evaluation, monitoring and transfer of information.
The CCU passes the commands issued for the traction, brake and door control units from the driver’s cab on to the respective control units via the vehicle bus. Conversely, the CCU receives the checkback signals from all important peripheral units and subsystems. All actual statuses are detected, stored and evaluated. This is especially important for effective diagnostics.
Other CCU functions involve the initiation and monitoring of test routines for peripheral units, the performance of the master function in the train formation, the concentration of diagnostics and status messages, as well as the performance of gateway functions for the different communication systems: for example, vehicle and train busses, I/O systems, onboard information systems, long-distance data transmission, control units lacking bus capability. Traction control unit – TCUTraction control units (TCUs) serve for open-loop and closed-loop control of motoring and braking via the traction motors. Today, the traction motors are supplied with power from modern pulse-width-modulated inverters. The TCUs receive commands and setpoints for controlling the traction system from the CCU and report the current status of the traction system back to the CCU.
Process functions such as jerk limitation and wheel spin/slide protection improve the ride performance of the vehicle. All the important status variables in the traction system are monitored for adherence to permissible maximum values and for plausibility.
Reliable signal transmission is also ensured. Additional functions of the TCU are preparation and shutdown of the traction system, management of the interfaces to the mechanical brake and the control equipment, as well as protection, testing and diagnosis of the traction components.
Another representation of a Sibas 32 TCU is the singleboard solution TCU. This board includes all functions necessary for the compact inverter. Sitrac (SIemens TRAction Control) is the new generation of open-loop and closed-loop control systems for converters and drive units for rail vehicles. Sitrac will be available in the TCU and can also be used in the Sibas 32 module rack as Sibas 32 S.
Sitrac integrates all functions for control, protection and diagnosis of the inverters.
New features are the operation without speed sensors and the high-dynamic torque control which ensures the highest possible dynamic response even with limited switching frequency. This allows a higher stability of torque and traction effort during influences from power supply and rail.
Improved diagnostics and the automatic self-test increase reliability and availability, while reducing the time the vehicle spends in the maintenance facility. source: www.transportation.siemens.com
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