Safety Switching Device for Setting a Safety-Related Device to a Safe State
First Claim
1. A safety switching device (900) for setting at least one safety-related device into a safe state, the device comprising:
- a first connection device (910) for connecting the safety switching device to a single-phase or multiple-phase power supply device;
at least one second connection device (920) for connecting a safety-related device;
a third connection device (940, 945) for connecting at least one safety-related input stage (760);
a power amplifier (200) that is single-phase or multiple-phase connected between the first and second connection devices (910, 920) with at least one controllable switch contact;
a measurement device (610); and
a safety device (820, 840) for multiple-channel driving of the power amplifier (200);
wherein the safety device (820, 840) comprisesa first control device (820), which has a programmable control unit (822) and which has a device for generating a monitoring signal, anda second control device (840),wherein the input stage (760) is connected to the first control device (820) and to the second control device (840) and is constructed for modulating an input signal with the monitoring signal coming from the first control device (820),wherein the first control device (820) and/or the second control device (840) set the safety-related device into a predetermined safe state if a fault appears as a response to the modulated input signal, andwherein the first control device (820) is allocated to the measurement device (610) and is constructed such that it sets the safety-related device into a predetermined safe state via the power amplifier (200) as a response to a measured analog signal, if a predetermined parameter of the measured analog signal lies outside a predetermined operating range.
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Accused Products
Abstract
The invention relates to a safety switching device, with which a safety-related device, preferably an electric drive, can be set into a safe state. The safety switching device (900) has a microprocessor or microcontroller (822), which can set, for example, an electric drive to be protected into a safe state both if an emergency circuit breaker, protective door switch, and/or two-hand switch is activated and also if there is faulty operation of the safety-related device or electric drive. For this purpose, the microprocessor (822) is preferably implemented such that it can determine from at least one analog signal to be measured whether a predetermined parameter, preferably the amplitude of the analog signal, lies outside a predetermined operating range. In addition, the microprocessor (822) can be a component of a safety device (810) which is constructed for multiple-channel control of a safety-related electric drive. In this way, the safety switching device (900) can respond to several safety functions independent of each other in order to set an electric drive into a safe state. In addition, for such a compact safety switching device, the risk of a wiring error relative to known measures is significantly reduced.
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Citations
53 Claims
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1. A safety switching device (900) for setting at least one safety-related device into a safe state, the device comprising:
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a first connection device (910) for connecting the safety switching device to a single-phase or multiple-phase power supply device; at least one second connection device (920) for connecting a safety-related device; a third connection device (940, 945) for connecting at least one safety-related input stage (760); a power amplifier (200) that is single-phase or multiple-phase connected between the first and second connection devices (910, 920) with at least one controllable switch contact; a measurement device (610); and a safety device (820, 840) for multiple-channel driving of the power amplifier (200); wherein the safety device (820, 840) comprises a first control device (820), which has a programmable control unit (822) and which has a device for generating a monitoring signal, and a second control device (840), wherein the input stage (760) is connected to the first control device (820) and to the second control device (840) and is constructed for modulating an input signal with the monitoring signal coming from the first control device (820), wherein the first control device (820) and/or the second control device (840) set the safety-related device into a predetermined safe state if a fault appears as a response to the modulated input signal, and wherein the first control device (820) is allocated to the measurement device (610) and is constructed such that it sets the safety-related device into a predetermined safe state via the power amplifier (200) as a response to a measured analog signal, if a predetermined parameter of the measured analog signal lies outside a predetermined operating range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A three-phase power amplifier for driving at least one load with first, second, and third wires (210, 211, 212;
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410, 411, 412;
510, 511, 512), which can be connected on the input side to a three-phase power supply device, characterized in that at least one controllable switch contact (231, 232, 242;
451, 431, 432;
520, 531, 532) is allocated to each wire for opening and closing each wire, wherein at least two of the switch contacts are driven independently of each other. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 53)
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410, 411, 412;
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27. A reversing switch arrangement comprising two switch elements (290, 295), which can be controlled independently of each other and which each have first and second switch contacts (291, 292;
- 296, 297), characterized in that the first switch contacts (291, 296) of the switch elements (290, 295) are wired for connection to a first wire (210) and the second switch contacts (292, 297) are wired for connection to a second wire (212), and in that the current flow through the connected wires is blocked in a predetermined position of the first and second switch contacts.
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28. A measurement device (10) for measuring a periodic analog signal, whose amplitude can lie outside a predetermined operating range, comprising:
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a determining device (20, 30, 40, 50) for determining the time period during which the amplitude of the of the analog signal to be measured lies outside the predetermined operating range, and an evaluation device (60), which calculates the maximum amplitude of the analog signal to be measured from the determined time period and the signal shape of the analog signal to be measured. - View Dependent Claims (29, 30, 35)
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31. A measurement device for measuring a periodic analog signal, which can lie outside a predetermined operating range, the device comprising:
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a sampling device (620) for sampling the analog signal at a sampling rate; a device (640, 650) for detecting and counting successive sampled values that are greater than or equal to a predetermined threshold in terms of magnitude; a memory device (670) that stores the maximum amplitude value lying outside the predetermined operating range for several reference signals and the associated number of counted sampled values that are greater than or equal to a predetermined threshold in terms of magnitude; and an evaluation device (660), which reads the associated maximum amplitude value from the memory device as a response to the number of sampled values determined by the detecting and counting device (640, 650). - View Dependent Claims (32, 33, 34)
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36. A method for measuring a periodic analog signal, whose amplitude can lie outside a predetermined operating range, with the the method comprising:
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determining the time period during which the amplitude of the analog signal to be measured lies outside the predetermined operating range; and calculating the maximum amplitude of the analog signal to be measured as a function of the determined time period and the signal shape, of the analog signal to be measured. - View Dependent Claims (37)
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38. A method for measuring a periodic analog signal, which can lie outside a predetermined operating range of a measurement device that is used, the method comprising:
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determining and storing, for several reference signals, the maximum amplitude lying outside the predetermined operating range and the associated number of sampled values that are greater than or equal to a threshold in terms of magnitude; sampling an analog signal to be measured at a sampling rate; counting the successive sampled values that are greater than or equal to the predetermined threshold in terms of magnitude; and reading out the maximum amplitude value belonging to the number of counted sampled values. - View Dependent Claims (39)
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40. A safety device for multiple-channel control of a safety-related device, comprising:
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a first microprocessor-controlled control device (770;
820), which has a signal generating device (772;
822) for generating a monitoring signal;a second control device (800;
840); andan input stage (760), which is connected to the first microprocessor-controlled device (770;
820) and to the second control device (800;
840) and which is constructed for modulating an input signal with the monitoring signal coming from the first microprocessor-controlled control device (770;
820);wherein the first microprocessor-controlled control device (770;
820) and/or the second control device (800;
840) set the safety-related device into a predetermined safe state if a fault occurs as a response to the modulated input signal. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification