Patent ID: 6809911
Filing Date: 2004-10-26
Classification: H01H

Abstract:
A machine installation having an electrical machine, a control unit for the machine, and a power supply for the machine, a tripping element for generating a control signal having at least a first and a second signal state, and a safety switching device for safely disconnecting the electrical machine as a function of the control signal, said safety switching device being separate from the machine and comprising:an input for receiving the control signal, an output for providing a reporting signal which is supplied to the control unit, a failsafe disconnection unit for fail-safely disconnecting the machine from the power supply, and a non-failsafe signaling unit, wherein the disconnection unit and the signaling unit are jointly supplied with the control signal, wherein the signaling unit is configured to produce the reporting signal in a non-failsafe manner as a function of the first and second signal state, and wherein the disconnection unit has a first delay element, by means of which the process of disconnecting is delayed by a first time interval relative to a chance in the reporting signal.