Safety switching device and method for failsafe shutdown of an electric load
AssigneePilz GmbH & Co. KG
InventorGunter Hornung
Life of this patent
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Abstract
The invention relates to a safety switching device for the failsafe shutdown of an electric load, such as an electrically driven machine. The safety switching device has a signal processing part for receiving and evaluating an input-side switching signal, which, for example, originates from an emergency stop switch. It also has at least one switching element which, controlled by the signal processing part, provides an output-side switching signal for shutting down the load. An anti-surge element is provided for canceling reaction voltage spikes when the load is shut down. The anti-surge element has at least a first and a second anti-surge operating mode, which can be activated as an alternative to one another.
Claims14
A safety switching device for failsafe shutdown of an electric load, the safety switching device comprising
- a signal processing part for receiving and evaluating an input-side switching signal,
- at least one switching element adapted to provide an output-side switching signal for shutting down the load, the at least one switching element being controlled by the signal processing part, and
- at least one anti-surge element for canceling voltage spikes when the load is shut down,
- wherein the anti-surge element has at least a first and a second anti-surge operating mode, which can be activated as an alternative to one another.
A method for failsafe shutdown of an electric load, comprising the steps of:
- receiving and evaluating an input-side switching signal,
- shutting down the load as a function of the input-side switching signal, and
- canceling voltage spikes by means of an anti-surge element when the load is being shut down,
- wherein the anti-surge element has at least a first and a second anti-surge operating mode, which are activated as an alternative to one another.
Dependencies are inferred from the claim text.