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All press control signals such as top dead center (TDC), bottom dead center (BDC) and stopping/rundown monitoring as well as the signals from the door protection and the emergency stop button are evaluated by the UE470. Operating modes such as single break or double break PSDI mode and blanking in the protective field can be set using an operating mode selector switch.
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The hazardous point is protected in this large press using a C4000 Safety Light Curtain. If a person reaches into the light curtain‘s protective field, the light curtain stops the press‘s dangerous movement.
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The interior of the press is monitored using an S3000 Safety Laser Scanner. The laser scanner prevents the press starting if there is a person inside. This is a secondary protective device that can never take over the function of the main protection. When the press is started, both sensors indicate the protective field is clear. Then the laser scanner is muted during the downward stroke. The two safety sensors are integrated using a UE470 Safety Controller.
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Point of Operation Safeguarding
The C4000 can be mounted in a variety of configurations to provide ease of access, material placement, material removal and maintenance without compromising the safety of workers. The C4000’s small dimensions and high resolution allows it to be installed closer to the hazardous zone and operate with a smaller safety distance. The C4000 can also be configured to accommodate various advanced functions. |
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Muting: Muting can be defined as the temporary suspension of the safety circuit by a self-checking control reliable, redundant control system during the normal operation of a machine.
The muting circuit can only be active when the machine is a non-hazardous portion of its machine cycle. Muting must be control reliable.
Blanking: Blanking is the ability to open a “window” in the light curtain to allow objects such as an automatic feeder or table top to penetrate through the light curtain. It is useful for objects that will always remain present and in the same position. Floating blanking is for objects that are not stationary, such as materials in a press brake.
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