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Intrinsically safe shaft signalling and communication equipment
A modern, intrinsically safe shaft signalling device that can operate in mine workings at any methane concentration, built on two redundant PLC controllers and two hybrid shaft cables.
Main components of the intrinsically safe shaft signalling system:
- SIMATIC S7 controllers working in a redundant configuration.
- Power supplies with intrinsically safe outputs, located in the shaft signalling cabinet, supplying all intrinsically safe components at the levels.
- Intrinsically safe input/output modules located at the individual levels.
- Redundant input/output modules serving the equipment in the hoisting machine room.
- RS485-to-optical signal converters.
- Two hybrid shaft cables containing optical fibres working in a Redundant Ring topology, copper cores supplying the equipment at the individual levels and telecommunication pairs.
- Acoustic signalling devices built into the intrinsically safe controller boxes and ISREa control and junction boxes.
- ISE optical signalling devices.
- Sensors, switches, push buttons and indicator lamps.
- Graphical operator panel.
- Intrinsically safe telephone system.
The main advantages of the system are:
- The equipment used allows the shaft signalling to operate at any methane concentration (I M1 Ex ia I).
- All equipment in the shaft is supplied with a safe 24 V DC voltage.
- SIMATIC S7 controllers in a redundant configuration keep the system running if one of them fails.
- Redundant intrinsically safe modules allow operation if one of the Profibus DP network nodes fails.
- Two independent Profibus DP networks.
- Only two hybrid shaft cables, providing full redundancy of the shaft connections.
- Graphical visualisation on the operator panel enabling full diagnostics and monitoring of the control system.
- Fast installation and commissioning, easy expansion thanks to the modular design.
- Programming with Siemens' widely used Step 7 software.
- Easy integration with the control systems of the hoisting machine, skip loading and unloading, and shaft-side equipment.
- Can work with a rope force measurement system.
- Signal recording on an independent recorder.
- Remote service and monitoring of the system.
- Communication provided by an intrinsically safe telephone system.
