Protector suitable for cascade connections and corresponding method for safety-conditioned switching
AssigneeSiemens Aktiengesellschaft
InventorThomas Heberlein
Life of this patent
Estimating the term…
Abstract
An installation is disclosed which can be switched on again by way of a common switch-on key. A pulse processing device integrated into the respective emergency off device is required for putting the emergency-off device for predetermined period of time after the switch-on pulse of the switch-on pulse of the switch-on key into an activation mode in which it can be switched on when no switch-off signal is available. It is thus possible to take the reaction times of the individual devices or actuators required for the cascading of emergency-off devices for switching on into consideration for a common switch-on operation.
Claims25
A protective device for the safety-related shutdown of an electrical unit, comprising:
- a first input for receiving a switch-off signal;
- a second input for receiving a switch-on signal in the form of a switch-on pulse;
- an output for driving the electrical unit;
- and
- a pulse processing device for setting the protective device to an activation state, in which it is switchable on when the switch-off signal is not applied, for a predetermined period of time from reception of the switch-on pulse.
A method for safety-related switching of an electrical unit, the method comprising:
- receiving a switch-off signal;
- switching the electrical unit off;
- receiving a switch-on signal in the form of a switch-on pulse;
- and
- switching the electrical unit on,
- the electrical unit being switchable on for a predeterminable period of time after reception of the switch-on pulse.
A protective device for safety-related switching of an electrical unit, comprising:
- means for receiving a switch-off signal;
- means for switching the electrical unit off;
- means for receiving a switch-on signal in the form of a switch-on pulse;
- and
- means for switching the electrical unit on, the electrical unit being switchable on for a predeterminable period of time after reception of the switch-on pulse.
Dependencies are inferred from the claim text.