PROGRAMMABLE MINING CONTROLS (PMC)

The PMC-R 2.0 control unit features an A6 processor with 260 MHz clock speed and three 32-bit cores – a single core for application code and two redundant cores for functional safety. All other PMC control units use a 32-bit RISC CPU. The controls are programmed in a state-of-the-art programming language commonly used for control systems. This allows easy software review and changes, highest safety standards, and customized adjustment.

HBT has developed a control system that treats the entire longwall as a single integrated machine. Within this system PMC-D (Drive) and PMC-V (Visualization) controllers are networked using the field bus system. This allows high-speed communication via one twisted cable pair over a range of up to 7 km (4.3 mi) without repeaters.

Because PMC controllers are modular, each tailored control is located next to the device it is controlling. This minimizes data transfer problems and simplifies troubleshooting.

All components are designed and manufactured in accordance with the latest standards and are subject to strict quality control. Circuit boards use the latest surface-mount technology and are secured in special trays to provide superior protection against shock and vibration. Rigorous quality control testing such as function control, vibration and pressure testing ensure the highest in-service reliability of the finished product. Each unit is tested underwater in accordance with IP68.

The PMC family complies with international standards, governing intrinsically safe and explosion-proof systems such as EN 1804 part 4, and meets most mechanical and environmental requirements of operators worldwide – one design, worldwide approval.

The PMC family is based on the experience gained with over 20,000 installed units worldwide. With housings made of resistant metal and stainless steel, the control units and peripherals are protected from dust and water ingress and have an IP68 rating. This results in high reliability, high availability and low failure rates over a long service life.