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CAT Main Control Unit PMC-D/PMC-D20

The intrinsically safe Cat® PMC-D control is used on shearer or plow faces to provide high level AFC (armed face conveyor) and plow automation. Each Drive unit needs to be equipped with one PMC-D control unit and equivalent I/O to operate the CST drives or UEL gearbox functions. In such a system a Cat PMC-V provides the Human Machine Interface (HMI) to interfere with the PMC-D controls to operate manual mode, visualize and change parameters and show actual process values. Within a PMC-D system minimum one and typically up to 3 PMC-Vs are in equal operation. The PMC-D system can control extremely sensitive the speed and torque of highly powered AFC CST drive. Using Profibus network all PMC-Ds and PMC-Vs in a system could exchange process data over long distances with high frequency.

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Attributes of PMC-D/PMC-D20 Control Unit

  • Robust stainless steel design
  • Highly reliable OS37 plug technology for complete gear box control
  • SKK24 hose cables for bus system and additional I/O connection
  • IP 68 rating (48 hr @ 1 m [3.28 ft] under water)
  • HMI with 24 multi feedback keys (pressure point, led light)
  • 63.5 mm (2.5 in) graphical monochrome display
  • Multi language support
  • Maintainability (brass bar mounting)
  • Optional eight (8) additional ports for acceleration sensors (PMC-D20)

Exemplarily System Layout of a PMC-D System (Shearer Face)

Main Features PMC-D Drive Control System

  • “Distributed controller Intelligence per drive”
  • Synchronized heavy load start up
  • Soft start up
  • Load sharing between conveyor drives
  • Overload protection
  • Motor braking feature
  • Further used in plow operations:
- Precise position detection - Overload protection

Additional Features

  • Usage of PMC-D for chain tensioning of AFC (front and rear conveyor) and Beam Stage Loader (BSL)
  • In conjunction with Slacktronik direct BSL chain slack control and relating chain tensioning
  • Usage of PMC-D for high accurate plow position control and monitoring
  • Support VFD controlled drive applications
  • Optional integration of “HEALTH for Longwall Vibration Analysis” function with PMC-D20 control unit:
- Acceleration sensor interface for 8 sensor - Integrated communication for vibration analysis

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