摘要:
A safety circuit assembly for switching on or switching off a hazardous system in a failsafe manner has an evaluating device which is designed to produce a redundant switching signal. The evaluating device is connected to a signaling device via a first and a second line forming a pair of lines. The signaling device has an actuator which can be switched between a defined first state and at least one further state. The evaluating device produces a first defined pulse signal and transmits the first defined pulse signal to the signaling device using the pair of lines in a first direction. The signaling device produces a second defined pulse signal, which is a predefined replica of the first pulse signal, and transmits the second defined pulse signal to the evaluating device using the same pair of lines when the actuator is in the defined first state.
摘要:
The invention relates to a detection system employed for securing a start-up of an application, said system comprising at least one first detector (D2) and one second detector (D3), each detector comprising two input terminals (I1, I2) connected to its logic inputs, two output terminals (O1, O2) connected to its logic outputs and two power supply terminals (0V, +24V) connected to two electrical power supply lines. The two output terminals (O1, O2) of the first detector (D2) are connected to the two input terminals (I1, I2) of the second detector (D3) and the two output terminals (O1, O2) of the second detector (D3) are connected to control devices (K1, K2) of the application to be secured, so as to form a detection chain.
摘要:
A battery safety device for a vehicle and a method of detecting failure thereof is installed between a high-voltage battery mounted on the vehicle and a power line. The device includes a first main relay connected to a positive terminal of the battery in series, and a second main relay connected to a negative terminal of the battery in series. A capacitor is connected in parallel to the first main relay and connected to the positive terminal of the battery.
摘要:
A safety circuit assembly for switching on or switching off a hazardous system in a failsafe manner has an evaluating device which is designed to produce a redundant switching signal. The evaluating device is connected to a signaling device via a first and a second line forming a pair of lines. The signaling device has an actuator which can be switched between a defined first state and at least one further state. The evaluating device produces a first defined pulse signal and transmits the first defined pulse signal to the signaling device using the pair of lines in a first direction. The signaling device produces a second defined pulse signal, which is a predefined replica of the first pulse signal, and transmits the second defined pulse signal to the evaluating device using the same pair of lines when the actuator is in the defined first state.
摘要:
A safety switching apparatus for the failsafe disconnection of an electrical load has a first and a second terminal for supplying a first and a second signal from a signaling device, such as an emergency-off button. The safety switching apparatus also has a first and a second switching element which together produce a redundant output switching signal for disconnecting the load. The first switching element has a first control circuit to which the first signal is supplied. The second switching element has a second control circuit to which the second signal is supplied. The safety switching apparatus further has circuitry providing a first current path, an alternative second current path and at least one further switching element. The at least one further switching element is designed to select either the first or the second current path, depending on a polarity of the second signal, in order to route the second signal to the second control circuit.
摘要:
Safety isolation systems and methods adapted for switching DC electrical power applications, including high voltage DC, are provided. A contactor is in series with a solid state DC switch and a switching circuit controls the operation of the contactor and the solid state DC switch. Mirror contacts may be added to the system that are capable of providing a reliable indication about the open/closed status of the main contacts of the contactor.
摘要:
A safety switch device for switching a power supply for a load on and off, having at least one driveable switching element, in particular a relay, and a safety circuit for checking a switching state of the switching element. The switching element is in the form of a changeover switch in such a manner that a first contact is electrically connected to either a second contact or a third contact by means of a switching operation. A method for operating a safety switch device is also provided.
摘要:
A method and an apparatus are disclosed for disconnection of a fault current which has occurred in an AC power supply system. A disconnection command which is produced in a protective device is supplied to a synchronization controller in order to open a circuit breaker, in which synchronization controller a command is delayed until the circuit breaker can be opened in synchronism with the power supply system. The method includes monitoring of the disconnection command emitted from the protective device and monitoring a fault-current signal, or a status signal emitted from the circuit breaker, and formation of an emergency disconnection command if the fault-current signal or the status signal is still present following a delay time after emission of the disconnection command, which delay time is greater than a sum of a natural response time of the circuit breaker and a time for quenching of a switching arc produced on opening of the circuit breaker.
摘要:
The invention relates to a module arrangement of safety switching devices. The arrangement comprises a plurality of input modules each for processing input signals from a safety transmitter and each for generating output signals. It further comprises at least two output modules each for driving an actuator responsive to the output signals. The input modules and the output modules are arranged in a series forming a series of modules. The input modules each are associated to one output module. According to one aspect of the invention, the association of the input modules to the first, the second or both output modules is achieved on the basis of the position of the input module within the series of modules.
摘要:
Systems (100) and methods (600) for controlling operations of a Handheld Scanning and Deactivation (“HSD”) device. The methods comprise: determining whether a human is located within a defined distance range of the HSD device; preventing first operations from being performed by the HSD device which cause a magnetic field to be generated, if it is determined that said human is located within the defined distance range of said HSD device; and initiating the first operations if it is determined that the human is not located within the defined distance range of the HSD device. The first operations comprise (1) interrogation operations for detecting a presence of an electronic article surveillance security tag and/or (2) deactivation operations for deactivating an electronic article surveillance security tag.