Supporting the Legacy Siemens Robicon MV Drives
Supporting the Legacy Siemens Robicon MV Drives
We have been committed to supporting the Legacy Siemens Robicon department since 1999.
The Robicon unit is configured as a large (1 MW 10,750 amp output) single-phase fixed frequency variable voltage power supply for induction heaters.
The customer encountered an over-saturation fault in the power unit and replaced the main control board to solve the over-saturation problem. We are required to verify the condition of the main control board and perform necessary repairs.
In order to fully test the main control board, a simulator system was combined to allow all control boards and PLCs to run together. The simulator system allows simulation of power battery and optical fiber serial communication. The voltage and current signals generated by the circuit board we designed depend on the IGBT ignition command sent to the power unit via the optical fiber link. The key component on the emulator circuit board is the internally programmed Xilinx FPGA, which can handle all serial data communications and PWM output for current and voltage feedback simulation.
With the simulation system running, all boards were successfully tested. No failure was found, which led to further investigations on site and the root cause of the unsaturated failure was determined.
In addition to building a simulation system, we also verified that the current Harmony power unit can run on the customer's traditional control system. To this end, the simulator board has been reprogrammed as a serial data gateway. Serial data was read from the old control system. The enable bit and the parity bit are inverted, which allows the harmonious power supply to work normally. This reduces the risk for customers because they can now run ready-to-use Harmony batteries on older control systems if needed. The customer’s old battery is now obsolete and is no longer supported by Siemens.
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