ABB AC 800PEC High Performance Control System Aluminium applications

Aluminium applications

- AC 800PEC unit controller ↔ AC 800PEC master controller communicates via PEC - PEC fibre optic link (100 μs)

- Can be independent of the main controller control unit

- Allows emergency operation (full smooth current control in emergency mode without AC 800PEC,

only in combination with DCS800 pre-magnetisation)

- Predictive maintenance functions can be included

- Open circuit, overcurrent, undervoltage and overvoltage protection packages included in software

- Newly developed OPC (Open Circuit Protection) stand-alone PLC (Programmable Logic Controller)

that can be used in conjunction with AC 800PEC main controller functions or

as a stand-alone protection during main board maintenance

- Controlled shutdown in the event of an event without immediate tripping → reduced disruption to the production process

- Potline load fluctuation detection and load shedding integrated into the application software

- Load tap converter fast tap function to prevent DC current overloads during disturbances

- Special Potline-to-Earth Resistance Measurement System (PERMS) based on the AC 800PEC series

- Maximum power regulation

- Prevents excessive power consumption and supports your generator

- Maximum DC voltage regulation to stabilise the process

Arc Furnace Applications

- Stable arc detection

- Different control modes (constant current, constant power or constant resistance)

- Quick connection to Power Quality Systems (PQS)

Includes ELREG (electrode regulation; control of the anode hydraulic system) function:

- Manual electrode control (analogue or digital)

- Electrode quick lift function (with or without separate quick lift valve)

- Automatic arc extinguishing function

- Automatic re-arc function

- Adaptive electrode control according to furnace conditions or heating stage

- Stacked integral control circuit

- Voltage fluctuation measurement (stability index calculation)

- Arc detection/protection of the furnace roof

- Protection of the furnace top from arcs during arc extinguishing

- Hydraulic oil pressure monitoring and electrode protection

- Collapse detection

- High-pressure detection

- Control logic for backpressure valves

- Voltage monitoring to ground

- Voltage monitoring at the top of the furnace

- Automatic raising of the electrode after a furnace shutdown command (distance or position selectable)

- Shut-off valve control

- Electrode speed limitation to protect electrode and arm

- Future functions

- Automatic proportional valve linearisation

Check

- Automatic proportional valve linearisation

- Dynamic voltage setpoint control for stable melting processes