The Pilz high integrity safety solution for a hand-fed platen press uses an array of light beam sensors and a modular safety control and monitoring system.
The light beam array detects a violation of the danger zone whilst the press is closing. This is achieved by sequentially muting the laser beams as the press closes. If any beam is broken before it has been muted, the press clutch safety valve is de-energised immediately bringing the hazardous movement to a stop. Once the final beam has been broken (press closed) the beams remain muted until the press cam switch has operated, signalling that the press is at the home position. The muting points are derived from the simulation of press position carried out within the PNOZmulti control system. The application also includes checking that the press cam switch operates correctly in each press cycle.
The safety solution is based on Pilz s PNOZmulti modular safety system. PNOZmulti is multifunctional, freely configurable and is ideal for monitoring safety functions such as Emergency-Stop, safety gates and light barriers, as well as performing standard control functions. Rather than hard wiring, safety circuits can be generated on a PC using PNOZmulti s intuitive configuration software. This configuration can then be stored on a memory card and downloaded to the PNOZmulti base unit.
The solution incorporates a PNOZmulti base unit, with input and output expansion modules to control all aspects of machine safety and control.
Background
The light beam array detects a violation of the danger zone whilst the press is closing. This is achieved by sequentially muting the laser beams as the press closes. If any beam is broken before it has been muted, the press clutch safety valve is de-energised immediately bringing the hazardous movement to a stop. Once the final beam has been broken (press closed) the beams remain muted until the press cam switch has operated, signalling that the press is at the home position. The muting points are derived from the simulation of press position carried out within the PNOZmulti control system. The application also includes checking that the press cam switch operates correctly in each press cycle.
The safety solution is based on Pilz s PNOZmulti modular safety system. PNOZmulti is multifunctional, freely configurable and is ideal for monitoring safety functions such as Emergency-Stop, safety gates and light barriers, as well as performing standard control functions. Rather than hard wiring, safety circuits can be generated on a PC using PNOZmulti s intuitive configuration software. This configuration can then be stored on a memory card and downloaded to the PNOZmulti base unit.
The solution incorporates a PNOZmulti base unit, with input and output expansion modules to control all aspects of machine safety and control.
Background
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