AC 800PEC Tuned for performance and efficiency

AC 800PEC Tuned for performance and efficiency
Powerful hardware for efficient, high-speed processing The AC 800PEC combines the floating-point computing performance of the CPU with the flexibility and high-speed capability of a FPGA. The system is separated into three performance levels covering different cycle times. Control tasks are allocated depending on their speed requirements: • Very fast tasks down to 25 ns (nanoseconds for FPGA tasks) • Fast tasks down to 100 μs (microseconds for Matlab/Simulink tasks) • Slow tasks down to 1 ms (miliseconds for control tasks)
The hardware architecture of the AC 800PEC is an ideal match to the three-level software structure. To support the short processing cycle times, the AC 800PEC provides a fast I/O system. Depend ing on the speed of the I/O connection, it is possi ble to achieve data throughput times below 100 μs, including the time required to read, process, write and transmit the signal.

Implementation of the AC 800PEC software on the three performance levels provides an exceptional range of control and communication functionality. The following software packages have been devel oped to support each of our specific high power rectifier applications. Aluminium applications • AC 800PEC Unit controller ↔ AC 800PEC Master controller communication via PEC – PEC fiber optical link (100 μs) • Units can be controlled independent from master • Allows emergency operation (full smooth current control, in emergency mode, without AC 800PEC, available only in combination with DCS800 pre magnetization) • Predictive maintenance features can be included
Open circuit-, over current-, under voltage-, over voltage protection packages included in software- A newly developed OPC (open circuit protec tion) stand-alone PLC (programmable logic controller), working in combination with the AC 800PEC Master controller functions or as standalone protection, in case of the master panel maintenance • Controlled shutdown in an event, not needing an immediate trip → less disturbance for your processes • Potline load swing detection and load shedding function integrated in application software • On Load Tap Changer fast tapping function in order to prevent DC current overload during disturbances • A special potline-to-earth resistance measure ment system based on an AC 800PEC family available (PERMS) • Maximum power regulation- To prevent over-shooting of power consump tion and to support your power generators • Maximum DC voltage regulation for stabilizing your process

Electrical arc furnace applications • Stable arc detection • Different control modes (constant current, constant power or constant resistance) • Fast link to power quality system (PQS) ELREG (electrode regulation; anode hydraulic system control) features included: • Electrode manual control (analog or digital) • Electrode fast lift function (with or without separate fast up valve) • Automatic arc strike function • Automatic arc restrike function • Adaptive electrode control according to furnace behavior or heat stage • Superimposed integral control circuit • Voltage fluctuation measurement (stability index calculation)
• Arc-to-roof detection/protection
• Arc-to-roof protection during arc strike

sequence
• Hydraulic oil pressure supervision and
electrode protection
• Cave-in detection
• High-voltage detection
• Counter pressure valve control logic
• Voltage-to-ground supervision
• Roof voltage monitoring
• Electrode auto raise function after furnace off
command (distance or position selectable)
• Blocking valve control
• Electrode speed limitation for electrode and
arm protection
• Future features- Automatic proportional valve linearization
check- Automatic proportional valve linearization- Dynamic voltage setpoint control for a stable
melting process