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PAMI.pptx

27 de Mar de 2023
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PAMI.pptx

  1. PROXIMITY DETECTION SYSTEM Presented by PAMICOR GRADUATE TRAINEES
  2. •Proximity: nearness in space •Proximity Sensor: a sensor that performs non-contact detection in comparison to sensors such as limit switches that detect objects by physically contacting them •A Proximity Detection System (PDS) is designed to slow down and stop the machine if there is identified a risk of collision with a person or an object carrying a tag •The Proximity Interface (PI) is an interface between a Proximity Detection System (PDS) and a machine
  3. • Depending on the installed PDS model, automatically generated alarms can be used that instruct personnel to take corrective or preventative action to avoid a collision. • Possible technologies that generate required sensor information to enable detection of close encounters between two or more objects could include localization, proximity detection, ranging, and zone control/area isolation.
  4. • In a Sandvik machine, PI system communicates with the control system of the machine via a CAN bus. • The control system controls the proportional brake valve based on requests of the PI system. • The activation time of Proximity Interface components and hydraulic system of the brakes from signal state change in the control module output to the commencement of braking is a maximum of 700ms. • If the control system detects a fault in the machine, controls of the PI system are overridden.
  5. SYSTEM STATES Safe state The safe state is an equipment condition where the PDS has not detected a tag around the machine. The machine can operate normally. Caution state The caution state is an equipment condition where the PDS has detected a tag inside the caution zone. The PI system limits the maximum speed of the machine to the parameter defined speed. If the speed limit is exceeded, the PI system controls the machine brakes to slow down the machine.
  6. Warning state • The warning state is an equipment condition where the PDS has detected a proximity tag inside the warning zone. The PI system limits the maximum speed of the machine to the parameter defined speed. If the speed limit is exceeded, the PI system controls the machine brakes to slow down the machine. Stop state • The stop state is an equipment condition where the PDS has detected a tag inside the stop zone. The PI system engages the parking brake. Fault state • System diagnostics has detected a fault situation and the machine is set to the limp mode.
  7. • The PD interface slows down and stops the machine if the proximity inputs are activated by the PDS. Operator can any time exceed the applied braking force by pressing the brake pedal. • PD Interface has certain limitations to slowdown or stop the machine. Collision with another vehicle or person could cause death or severe injury. • PD System must never be seen as the only control to avoid accidents. Drive at safe speed and slowdown the machine always when other traffic is in working area.
  8. Operation in case of a detection • Caution zone • If an object (wearing a tag) is detected inside the caution zone, the throttle pedal position is overridden, and the service brakes are activated with increasing braking force if the speed of the machine is more than 10 km/h. • Once the speed limit has been achieved, the brakes are released, the 2nd gear is set and the throttle pedal is controlling speed of the engine. The speed and gears are limited until the caution zone is clear of detection tags. • The converter lock-up is not automatically released in the caution zone, but the activation is prevented by the control system.
  9. Operation in case of a detection Warning zone • If an object (wearing a tag) is detected inside the warning zone, the throttle pedal position is overridden, and the service brakes are activated with increasing braking force if the speed of the machine is more than 5 km/h. • Once the speed limit has been achieved, the brakes are released, the 1st gear is set and the throttle pedal is controlling speed of the engine. • The speed and gears are limited until the warning zone is clear of detection tags. • The converter lock-up is not automatically released in the warning zone, but the activation is prevented by the control system.
  10. Operation in case of a detection Stop zone • If an object (wearing a tag) is detected inside the stop zone, the parking brakes will be engaged and an alarm/warning will be shown to the operator. • The parking brakes cannot be released until the stop zone is clear of detection tags. When operating in the Remote Control mode, the parking brake button of the remote controller stays in the released position in case of a detection. • The parking brakes will not be released even if the detection tag leaves from the stop zone. The parking brake must be engaged and released from the remote controller before the tramming can continue.
  11. THANK YOU
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