Abstract: A circuit arrangement comprises: an electronic switch; at least one relay including a relay coil; a shunt resistor; a voltage supply device to supply an operating voltage to the at least one relay, wherein the electronic switch, the relay coil of the at least one relay, and the shunt resistor are electrically connected in series to one another between the operating voltage and ground; a current regulator to drive the electronic switch with a pulse width modulation to adjust a control current that flows through the relay coil; at least one sensor to generate sensor data indicative of shocks, impacts or vibrations acting on the at least one relay; and an evaluating unit to evaluate the sensor data, wherein the current regulator is configured to adjust the control current based on the sensor data evaluated by the evaluating unit.

Abstract: Safety circuit arrangement for failsafe shutdown of an electrically driven installation, comprising a safety switching device, having a safety switching relay that is configured to close or disconnect a power supply path to the installation in a failsafe manner, and a signaling device, having an actuator and a signal generator that is connected to the safety switching device by a first line. The actuator of the signaling device is interchangeable between first and second defined states and the signal generator is configured to generate a first clock signal on the first line only when the actuator is in the first defined state. Furthermore, the safety switching device is configured to draw electrical power from the first clock signal that is greater than or equal to the defined actuating power of the safety switching relay and to convert said electrical power to direct current for actuating the safety switching relay.

Abstract: A safety switching device for fail-safely disconnecting an electrical load has an input part for receiving a safety-relevant input signal, a logic part for processing the at least one safety-relevant input signal, and an output part. The output part has a relay coil and four relay contacts. The first and second relay contacts are arranged electrically in series with one another. The third and fourth relay contacts are also arranged electrically in series with one another. The first and the third relay contacts are mechanically coupled to each other and form a first group of positively driven relay contacts. The second and the fourth relay contacts are mechanically coupled to each other and form a second group of positively driven relay contacts. The logic part redundantly controls the first and the second groups of positively driven relay contacts to selectively allow, or to interrupt in a fail-safe manner, a current flow to the electrical load, depending on the safety-relevant input signal.

Abstract: A circuit arrangement comprises: an electronic switch; at least one relay including a relay coil; a shunt resistor; a voltage supply device to supply an operating voltage to the at least one relay, wherein the electronic switch, the relay coil of the at least one relay, and the shunt resistor are electrically connected in series to one another between the operating voltage and ground; a current regulator to drive the electronic switch with a pulse width modulation to adjust a control current that flows through the relay coil; at least one sensor to generate sensor data indicative of shocks, impacts or vibrations acting on the at least one relay; and an evaluating unit to evaluate the sensor data, wherein the current regulator is configured to adjust the control current based on the sensor data evaluated by the evaluating unit.

Abstract: Safety circuit arrangement for failsafe shutdown of an electrically driven installation, comprising a safety switching device, having a safety switching relay that is configured to close or disconnect a power supply path to the installation in a failsafe manner, and a signaling device, having an actuator and a signal generator that is connected to the safety switching device by a first line. The actuator of the signaling device is interchangeable between first and second defined states and the signal generator is configured to generate a first clock signal on the first line only when the actuator is in the first defined state. Furthermore, the safety switching device is configured to draw electrical power from the first clock signal that is greater than or equal to the defined actuating power of the safety switching relay and to convert said electrical power to direct current for actuating the safety switching relay.

Abstract: A safety switching device for fail-safely disconnecting an electrical load has an input part for receiving a safety-relevant input signal, a logic part for processing the at least one safety-relevant input signal, and an output part. The output part has a relay coil and four relay contacts. The first and second relay contacts are arranged electrically in series with one another. The third and fourth relay contacts are also arranged electrically in series with one another. The first and the third relay contacts are mechanically coupled to each other and form a first group of positively driven relay contacts. The second and the fourth relay contacts are mechanically coupled to each other and form a second group of positively driven relay contacts. The logic part redundantly controls the first and the second groups of positively driven relay contacts to selectively allow, or to interrupt in a fail-safe manner, a current flow to the electrical load, depending on the safety-relevant input signal.

Abstract: A signaling device for a safety circuit has an input part for receiving an external state variable, at least one switching element and a control part. The control part controls the at least one switching element as a function of the external state variable, such that a signal applied to the input is communicated to the output. According to one aspect of the invention, the input of the switching element is internally connected to a fixed potential, preferably a fixed High potential. In a safety circuit for turning off a hazardous installation, such signaling devices are connected in series with one another to a safety controller. In such an arrangement, the control part of the downstream second signaling device also controls its switching elements as a function of the output of the first signaling device.

Abstract: There is disclosed a safety switch for generating an enable signal as a function of the position of a moveable guard door. The safety switch comprises a door part and a frame part. The door part has an activator, which can be displaced between a first and a second position. The frame part has a cutout, in which the activator can engage in the second position. A locking element is arranged on the door part in order to lock the activator in the second position. A sensor is designed to detect at least one of the positions of the activator in order to generate the enable signal as a function thereof.

Abstract: A safety switch for safety circuit arrangement has a control part for processing an input signal and at least one switching element with at least one active and one inactive switching state. The control part controls the switching element in order to generate an output signal dependent on the input signal at an output. In addition, the safety switch has a diagnostic function for identifying a functional fault. The control part is configured to transfer the switching element into the inactive state when a functional fault is identified. According to one aspect of the invention, the control part is also configured to generate a data message at the output, which data message is dependent on the functional fault.

Abstract: A safety switch for reliably switching off a dangerous device has an actuator which can be moved between a first position and at least one second position. It also has a detector for detecting the actuator in at least one of the said positions. The detector comprises a transponder with an individual transponder identification and a reading unit for reading out the transponder identification. The transponder and the reading unit are arranged relative to one another such that the reading unit is capable of reading out the transponder in the first position of the actuator but not in its second position.

Abstract: There is disclosed a safety switch for generating an enable signal as a function of the position of a moveable guard door. The safety switch comprises a door part and a frame part. The door part has an activator, which can be displaced between a first and a second position. The frame part has a cutout, in which the activator can engage in the second position. A locking element is arranged on the door part in order to lock the activator in the second position. A sensor is designed to detect at least one of the positions of the activator in order to generate the enable signal as a function thereof.

Abstract: A safety switch for reliably switching off a dangerous device has an actuator which can be moved between a first position and at least one second position. It also has a detector for detecting the actuator in at least one of the said positions. The detector comprises a transponder with an individual transponder identification and a reading unit for reading out the transponder identification. The transponder and the reading unit are arranged relative to one another such that the reading unit is capable of reading out the transponder in the first position of the actuator but not in its second position.

Abstract: An apparatus for failsafe disconnection of an electrical load has a first and at least one second safety switching device. The first safety switching device has a first evaluation and control unit, an output and an electronic switching element, for producing a potential-related switching signal at the output under the control of the first evaluation and control unit. The second safety switching device has a second evaluation and control unit and an input. The input and the output are connected to one another via a single-channel connecting line, and the input supplies the second evaluation and control unit with the potential-related switching signal from the output of the first safety switching device. In order to fulfill safety standards for such kind of apparatus, the second safety switching device has at least two input circuits to which the potential-related switching signal from the output of the first safety switching device is supplied in a mutually redundant manner.

Abstract: The invention relates to a safety switching device for connecting and reliably disconnecting an electrical load in response to a switching event from a safety transmitter. The safety switching device has at least a switching element and an operating mode selector unit for selecting an operating mode in response to a defined input signal. An input port is provided, which is connected to the operating mode selector unit such that the defined input signal can be supplied to the latter. The operating mode selector unit is designed such that it identifies the defined input signal as one from a group of different defined input signals. Responsive thereto, it selects an operating mode.

Abstract: The invention relates to a safety switching device for connecting and safely disconnecting an electrical load, in particular an electrically driven machine. The safety switching device comprises at least a first and a second electronic switching element, at least a first and a second output terminal, and at least one input terminal for a first switching signal that acts on the switching elements. According to one aspect of the invention, the first and the second switching element each have an output which, depending on the first switching signal, produces an output signal at a first potential or at a second potential. The output of the first switching element is connected to the first output terminal, and the output of the second switching element is connected to the second output terminal. The invention further relates to a system of safety switching devices of this kind.

Abstract: The invention relates to a safety switching device for connecting and reliably disconnecting an electrical load in response to a switching event from a safety transmitter. The safety switching device has at least a switching element and an operating mode selector unit for selecting an operating mode in response to a defined input signal. An input port is provided, which is connected to the operating mode selector unit such that the defined input signal can be supplied to the latter. The operating mode selector unit is designed such that it identifies the defined input signal as one from a group of different defined input signals. Responsive thereto, it selects an operating mode.

Abstract: The invention relates to a safety switching device for connecting and safely disconnecting an electrical load, in particular an electrically driven machine. The safety switching device comprises at least a first and a second electronic switching element, at least a first and a second output terminal, and at least one input terminal for a first switching signal that acts on the switching elements. According to one aspect of the invention, the first and the second switching element each have an output which, depending on the first switching signal, produces an output signal at a first potential or at a second potential. The output of the first switching element is connected to the first output terminal, and the output of the second switching element is connected to the second output terminal. The invention further relates to a system of safety switching devices of this kind.