JP2015134681A - Elevator car position detection device with self-diagnosis function, and self-diagnosis method for elevator car position detection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator car position detection device and a self-diagnosis method that can reduce time required for self-diagnosis and improve reliability of an elevator system.SOLUTION: The elevator car position detection device is provided in a hoistway 1, and includes: a plurality of photoelectronic sensors 31 that detects an elevator car position to determine that a state where the car has landed and is on a floor is a first state and a state where the car is travelling is a second state; a safety relay part 40 that can switch a state of a power source for supplying electricity to each photoelectronic sensor 31 to a power source cut-off state in response to an external command; and a control part 4 that reads an output from each photoelectronic sensor 31 to grasp an elevator car position in a power source supply state, and that outputs, as an external command, a self-diagnosis start command to the safety relay part 40 at desired timing to read changes of outputs from the plurality of photoelectronic sensors, thereby performing self-diagnosis of the outputs from the plurality of photoelectronic sensors 31 in the power source cut-off state.

Description

  The present invention relates to an elevator car position detection device having a self-diagnosis function and a self-diagnosis method of an elevator car position detection function with respect to elevator car position detection.

  A conventional method of detecting the elevator car position is to install a non-contact photoelectric switch with a light projecting side and a light receiving side on each floor, and light emitted from the light projecting side at the stop position of each floor Is detected by the light receiving side being unable to receive light by blocking the detection plate attached to the car side. In such a detection method, it is possible to self-diagnose a non-contact photoelectric switch on a floor that is not landing, but a non-contact photoelectric switch installed on a floor that is landing is In this state, it is not possible to perform self-diagnosis as to whether or not the light receiving side normally switches from the light receiving state to the light not receiving state.

  Therefore, even when the car is landing, to move the position of the non-contact photoelectric switch to enable self-diagnosis of the non-contact photoelectric switch installed on the floor during landing. There has been conventionally known an elevator control device that is provided with a driving device for creating a state in which light from the light projecting side can be received on the light receiving side (see, for example, Patent Document 1). The position detection device disclosed in Patent Document 1 starts self-diagnosis when receiving a self-diagnosis start command transmitted from the elevator control device at a period registered in advance.

  When the position detection device starts self-diagnosis, if there is a non-contact photoelectric switch that cannot perform self-diagnosis because the car is landing, the elevator control device The self-diagnosis is performed after the switch is moved to a position where the self-diagnosis can be performed by the driving device.

JP 2003-335462 A

However, the prior art has the following problems.
Since the elevator control device disclosed in Patent Document 1 transmits a self-diagnosis start command to the position detection device at a pre-registered cycle, the non-contact is not possible because the car is landing A state in which a photoelectric switch is present frequently occurs. For this reason, it is necessary to provide a driving device for moving the non-contact type photoelectric switch, which cannot perform self-diagnosis at the position as it is, to a position where self-diagnosis is possible, and this increases the cost. It was.

  Moreover, there is a problem that the time required for self-diagnosis becomes longer due to the addition of the operation of moving the non-contact photoelectric switch by the driving device. Furthermore, providing the driving device in the non-contact type photoelectric switch complicates the structure, and as the structure becomes complicated, the failure rate of the position detection device may increase. As a result, there is a problem that the self-diagnosis cannot be performed correctly and the reliability of the elevator control device is lowered.

  The present invention has been made to solve the above-described problems, and can perform self-diagnosis of a photoelectric sensor used for car position detection in a shorter period of time and at a desired timing. It is an object of the present invention to obtain an elevator car position detecting device having a function and a self-diagnosis method of an elevator car position detecting function.

  The position detecting device having a self-diagnosis function according to the present invention is installed for each floor in the hoistway, and the elevator car is set in a first state when it is landing and as a second state when it is not landing. A plurality of photoelectric sensors for detecting positions, a safety relay unit capable of switching the power supplied to each of the plurality of photoelectric sensors to a power cutoff state by an external command, and reading a sensor output from the plurality of photoelectric sensors in the power supply state In addition to grasping the elevator car position, output a self-diagnosis start command as an external command to the safety relay unit at a desired timing, and read the sensor output change state by multiple photoelectric sensors in the power-off state. A control unit that performs self-diagnosis of sensor outputs of a plurality of photoelectric sensors is provided.

  Also, the elevator car position detection function self-diagnosis method according to the present invention is installed for each floor in the hoistway, and the state of landing is set as the first state and the state of not landing is set as the second state. A plurality of photoelectric sensors for detecting the elevator car position, a safety relay unit capable of switching the power supplied to each of the plurality of photoelectric sensors to a power shut-off state by an external command, and a sensor by the plurality of photoelectric sensors in the power supply state An elevator car position detection function executed in an elevator car position detection device having a self-diagnosis function having a control unit that performs self-diagnosis of a plurality of photoelectric sensors as well as grasping the elevator car position by reading the output In this self-diagnosis method, the control unit requests a self-diagnosis start command as an external command to the safety relay unit. Having a command transmission step, and diagnostic performing a plurality of self-diagnosis of the sensor output of the photoelectric sensor by reading a plurality of changing state of the sensor output by the photoelectric sensor in the power cutoff state to output timing.

  According to this invention, the timing at which the control unit issues a self-diagnosis start command is set to a desired timing. Thereby, it is possible to prevent the self-diagnosis from becoming impossible due to the relative position of the car and the photoelectric sensor, and the self-diagnosis can be simultaneously performed for all the photoelectric sensors. In addition, since it is not necessary to provide a separate device for self-diagnosis, the structure can be simplified. Therefore, an elevator car position detecting device having a self-diagnosis function capable of reducing the time required for self-diagnosis and improving the reliability of the elevator apparatus, and a self-diagnosis method of the elevator car position detecting function are obtained. Can do.

1 is an overall configuration diagram of an elevator apparatus that is a subject of self-diagnosis according to Embodiment 1 of the present invention. It is an enlarged view which shows the photoelectric sensor of FIG. It is a block diagram which shows the position detection apparatus by Embodiment 1 of this invention. It is a block diagram which shows the position detection apparatus by Embodiment 2 of this invention. It is a block diagram which shows the position detection apparatus by Embodiment 4 of this invention.

  BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an elevator car position detection device having a self-diagnosis function and a self-diagnosis method for an elevator car position detection function according to the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram of an elevator apparatus that is a self-diagnosis target according to Embodiment 1 of the present invention. In FIG. 1, a hoisting machine 2 having a sheave, a deflector 3, a control unit 4, and a speed governor 5 are arranged at the upper part of the hoistway 1. A main rope (for example, a rope or a belt) 6 is wound around the hoist 2 and the deflector 3. A car 7 and a counterweight 8 are suspended in the hoistway 1 by a main rope 6. The car 7 and the counterweight 8 are moved up and down in the hoistway 1 by the driving force of the hoisting machine 2. The operation of the hoisting machine 2 is controlled by a control unit 4 that controls the operation of the elevator.

  The control unit 4 detects the moving amount and moving direction of the car 7 based on a signal transmitted from an encoder (not shown) provided in the speed governor 5. The speed governor 5 is provided with an emergency stop (not shown). When an abnormal speed increase of the car 7 is detected, the emergency stop is operated and the movement of the car 7 is stopped. The car 7 and the speed governor 5 are connected to each other by an endless speed governor rope 10 wound around a sheave of the speed governor 5 and a tension sheave 9 disposed at the lower part of the hoistway 1. .

  Further, the control unit 4 grasps the position of the car 7 in the hoistway 1 based on a signal transmitted from the elevator car position detection device 30 (hereinafter simply referred to as the position detection device 30). . The position detection device 30 includes a plurality of photoelectric sensors 31 provided inside the hoistway 1 of the landing sill 11 of each floor, and a car 7 facing the surface of the hoistway 1 where the landing sill 11 of each floor is provided. And a detection plate 32 provided on the surface.

  The photoelectric sensor 31 is provided in each of the landing thresholds 11 on each floor. Accordingly, the photoelectric sensors 31 are arranged in the hoistway 1 and at an arbitrary interval with respect to the height direction of the hoistway 1 (the vertical direction in FIG. 1). The photoelectric sensor 31 detects the state where the car 7 is landing as the first state and detects the state where the car 7 is not landing as the second state. FIG. 2 is an enlarged view showing the photoelectric sensor 31 of FIG. As shown in FIG. 2, the photoelectric sensor 31 includes a light projecting unit 31a, a light receiving unit 31b arranged to face the light projecting unit 31a, and a connection unit 31c that connects the light projecting unit 31a and the light receiving unit 31b. It is configured.

  In addition, the photoelectric sensor 31 has an integral structure by a connecting portion 31c that connects a pair of light projecting portions 31a and light receiving portions 31b facing each other, and has a substantially U shape (substantially U shape). The photoelectric sensor 31 is attached to the landing sill 11 with the light projecting unit 31a and the light receiving unit 31b protruding from the landing sill 11 side into the hoistway 1. The photoelectric sensor 31 may be attached to a hoistway wall or an arm (not shown) fixed to the rail. Further, the light projecting unit 31a and the light receiving unit 31b are arranged in a state of facing each other with a distance in the width direction of the hoistway 1 (depth direction in FIG. 1).

  The light projecting unit 31a emits light from the light emitting element 310a provided inside when the power is supplied from the outside (in the first embodiment, a power supply 41 for relay described later) (that is, in a power supply state). . The light receiving unit 31b receives light emitted from the light emitting element 310a by a light receiving element 311b provided inside the light receiving unit 31b. The light receiving unit 31b is “Low level” (hereinafter referred to as “L level”) when the amount of light received from the light projecting unit 31a is equal to or greater than a predetermined level, and “High” when the amount of received light is less than the predetermined level. A sensor output signal “level” (hereinafter referred to as “H level”) is output to the control unit 4.

  As shown in FIG. 1, the detection plate 32 is provided so as to protrude from the car 7 toward the landing sill 11 so as to be able to pass between the light projecting unit 31 a and the light receiving unit 31 b. In this example, the detection plate 32 is attached to the lower part of the car 7.

  Accordingly, in the control unit 4, as the car 7 moves, the detection plate 32 blocks light between the light projecting unit 31 a and the light receiving unit 31 b of the photoelectric sensor 31 provided on the landing threshold 11 of which floor. It is possible to determine whether the car 7 is received by receiving a sensor output signal from the light receiving unit 31b of each floor, and the position of the car 7 can be grasped.

  Thereby, the output signal of “L level” in the first embodiment is output when the light emitted from the light projecting unit 31a is not blocked by the detection plate 32, that is, in the second state. The “H level” sensor output signal is output when the light emitted from the light projecting unit 31a is blocked by the detection plate 32, that is, in the first state.

  In addition to detecting the position of the car 7 by receiving a sensor output signal corresponding to the position of the car 7 by the position detecting device 30 of each floor, the control unit 4 of the present invention detects the position of each floor. The detection device 30 has a self-diagnosis function for confirming whether or not it is operating correctly (whether or not it has failed). Hereinafter, details of the position detection device 30 having a self-diagnosis function will be described with reference to FIG.

  FIG. 3 is a block diagram showing an elevator car position detection apparatus 30 having a self-diagnosis function according to Embodiment 1 of the present invention. As shown in FIG. 3, the position detection device 30 is provided in the control unit 4, and controls a CPU 4 a that controls the position detection device 30, and N (N is an arbitrary natural number) photoelectric sensors 31 installed on each floor. , A safety relay unit 40 (hereinafter referred to as an RL unit 40) for switching whether to supply power to each photoelectric sensor 31, and a plurality of digitally converted sensor output signals from each photoelectric sensor 31 and transmitting them to the CPU 4a The transmission unit 50 is connected by a wiring cable. In this example, a common safety relay unit 40 is connected to each photoelectric sensor 31.

  The CPU 4a is connected to the driver IC 43 of the RL unit 40, and outputs a self-diagnosis start command of each photoelectric sensor 31 at a desired timing to turn on the driver IC 43, thereby turning on the coil 42 of the safety relay RL1. be able to. The desired timing is, for example, when the self-diagnosis of all the photoelectric sensors 31 is to be performed at the same time, by the sensor output from each floor position detection device 30, the car 7 is placed at all floor landings. This is when it is confirmed. Specifically, it is possible that the car 7 moves and is between the floors when the passenger performs call registration and destination registration.

  The RL unit 40 includes a relay power source 41, a coil 42 of the safety relay RL1, a driver IC 43 that switches the ON / OFF state of the coil 42, and a switching unit 44 that switches according to the ON / OFF state of the coil 42. ing.

  The driver IC 43 is connected to the CPU 4a, and turns on the coil 42 when receiving a self-diagnosis start command from the CPU 4a. The ON state of the coil 42 refers to a state in which the relay power source 41 can energize the coil 42. As the driver IC 43, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is used.

  When the coil 42 is turned on, the switching unit 44 is switched. The switching unit 44 includes a make contact (normally open: NO) 44a (hereinafter referred to as NO contact 44a) of the safety relay RL1 and a safety relay RL1 that is movable in conjunction with the NO contact 44a by a forcible guide (not shown). And a break contact (NC) 44b (hereinafter, NC contact 44b).

  At the NC contact 44 b, one end is connected to the relay power supply 41, and the other end is connected to each photoelectric sensor 31. The NC contact 44b is normally in a closed state (ON state), and is in an open state (in an OFF state) when the coil 42 is in an ON state.

  Accordingly, power is normally supplied to each photoelectric sensor 31 from the relay power supply 41 which is an external power supply via the NC contact 44b. On the other hand, when the driver IC 43 receives the self-diagnosis start command from the CPU 4a and is turned on, the NC contact 44b is turned off in the switching unit 44, and the power from the relay power supply 41 to each photoelectric sensor 31 is turned on. Blocked. That is, the switching unit 44 can switch the power supply to the photoelectric sensor 31 between a power supply state and a power cut-off state.

  In each photoelectric sensor 31, the light projecting unit 31a side is connected to the NC contact 44b, and the light receiving unit 31b side is connected to each transmitting unit 50. The sensor output signal input from the light receiving unit 31b to the transmitting unit 50 is, for example, “Low level” (hereinafter referred to as L level) when light passes between the light projecting unit 31a and the light receiving unit 31b. When the light does not pass between the light projecting unit 31a and the light receiving unit 31b, it is set to “High level” (hereinafter referred to as “H level”).

  Therefore, the light receiving unit 31b is used as a sensor output signal when the power from the relay power supply 41 is cut off or in the first state where the detection plate 32 passes between the light projecting unit 31a and the light receiving unit 31b. In the second state in which “H level” is output, the power from the relay power supply 41 is supplied, and the detection plate 32 does not exist between the light projecting unit 31a and the light receiving unit 31b, the sensor output signal is “L level” is output.

  One transmission unit 50 is provided for each photoelectric sensor 31. Each transmission unit 50 includes a photocoupler 51 that converts a sensor output signal into a digital signal, and a primary power supply 52 that supplies power to the primary side of the photocoupler 51. The photocoupler 51 includes an LED (light emitting diode) 51a serving as a light emitting element disposed on the primary side and a transistor 51b serving as a light receiving element disposed on the secondary side.

  In the LED 51a, one end portion is connected to the corresponding light receiving portion 31b, and the other end portion is connected to the primary power source 52. The primary power supply 52 supplies power to the LED 51a when the sensor output signal is at L level. On the other hand, when the sensor output signal is at the H level, the primary power source 52 does not supply power to the LED 51a.

  When power is supplied from the primary power supply 52, the LED 51a emits light. When the LED 51a emits light, the transistor 51b operates (becomes ON state) and becomes a ground potential. Therefore, the output signal of the transistor 51b (hereinafter referred to as a level signal) is pulled to the L level. As a result, the CPU 4a receives the L level signal.

  On the other hand, when power is not supplied from the primary power supply 52, the LED 51a does not emit light. When the LED 51a does not emit light, the transistor 51b does not operate (becomes OFF state), and thus is pulled up to the potential connected to the pull-up resistor. Therefore, the level signal is raised to the H level. As a result, the CPU 4a receives an H level signal. That is, the transmission unit 50 transmits a different level signal to the CPU 4a depending on whether or not power is supplied to the photoelectric sensor 31.

  Next, an operation in which the CPU 4a of the control unit 4 detects the position information of the car 7 will be described. The CPU 4a does not transmit a self-diagnosis start command to the driver IC 43 while detecting the position information of the car 7. For this reason, since the driver IC 43 is in the OFF state, in the switching unit 44, the NO contact 44a is in the OFF state and the NC contact 44b is in the ON state.

  Therefore, the relay power supply 41 supplies power to each photoelectric sensor 31 via the NC contact 44b. Since the power is supplied to each photoelectric sensor 31, the light emitting element of the light projecting unit 31a emits light toward the light receiving unit 31b. That is, light passes between the light projecting unit 31a and the light receiving unit 31b. At this time, the CPU 4 a receives an L level signal via the transmission unit 50.

  When the detection plate 32 blocks the light from the light projecting unit 31 a to the light receiving unit 31 b as the car 7 moves, the CPU 4 a transmits the transmission unit connected to the light receiving unit 31 b blocked by the detection plate 32. 50 level signals from H are received. Thereby, CPU4a can grasp | ascertain that the car 7 exists in the floor which received the level signal of H level. In this way, the control unit 4 detects the position information of the car 7.

  Next, a self-diagnosis operation for simultaneously checking whether or not each photoelectric sensor 31 is operating correctly will be described. First, the CPU 4a transmits a self-diagnosis start command to the driver IC 43 at a desired timing (command transmission step). Here, as an example, the desired timing will be described as the timing at which the passenger performs call registration and destination registration and the car 7 moves between the floors in order to simultaneously perform self-diagnosis of all the photoelectric sensors 31.

  The driver IC 43 that has received the self-diagnosis start command is in an ON state, so that power is supplied to the coil 42 from the relay power supply 41. Along with this, the NO contact 44a of the switching unit 44 is turned on, and the NC contact 44b is turned off. Thereby, the power supply from the relay power supply 41 to each photoelectric sensor 31 is stopped simultaneously.

  When each photoelectric sensor 31 enters a power cutoff state in which power supply is stopped, the light emitting element of the light projecting unit 31 a stops emitting light, so that the light receiving unit 31 b does not transmit a sensor output signal to the transmission unit 50. As a result, the level signals received from the transmission unit 50 by the CPU 4a are simultaneously switched from the L level to the H level.

  The CPU 4a diagnoses that each photoelectric sensor 31 is operating correctly when all the level signals are switched from the L level to the H level. On the other hand, if even one level signal remains at the L level, the CPU 4a diagnoses that the photoelectric sensor 31 or the transmission unit 50 is out of order (diagnosis step). When the CPU 4a diagnoses that the photoelectric sensor 31 or the transmission unit 50 is out of order, the CPU 4a transmits a signal that prompts maintenance and inspection to an elevator administrator and a maintenance company.

  In the above, in order to perform self-diagnosis of all the photoelectric sensors 31 at the same time, the desired timing is the timing at which the passenger performs call registration and destination registration, and the car 7 moves and is between the floors. This is not a limitation. For example, first, when the car 7 is stopped at a landing on the nth floor, self-diagnosis is performed except for the photoelectric sensor 31 provided on the nth floor, and then the car 7 is moved to a landing other than the nth floor and stopped. Self-diagnosis is performed again at the timing (n is an arbitrary natural number). Even if the self-diagnosis is performed at such timings, the self-diagnosis of all the photoelectric sensors 31 can be performed.

  As described above, in the position detection device according to the first embodiment, the CPU transmits a self-diagnosis start command to the RL1 unit at a desired timing, not at a timing with a period registered in advance. By performing self-diagnosis of the position detection device at such timing, it is possible to perform self-diagnosis of the position detection device without providing a separate device for moving the photoelectric sensor for self-diagnosis. That is, it is possible to perform self-diagnosis in the state where the user is not actually landing that the signal can be surely switched from the L level to the H level when landing.

  Further, since the self-diagnosis of the position detection device can be performed without providing a separate device, it is possible to prevent the structure of the position detection device from becoming complicated. Therefore, it is possible to prevent an increase in failure rate due to the complexity of the position detection device, and it is possible to improve the reliability of the elevator apparatus. Furthermore, an increase in cost due to a separate apparatus can be suppressed.

  In addition, when the car is stopped at the n-th floor landing, and after that, the car moves from the n-th floor and between the n-th and n-1 floors, or between the n-th floor and the n + 1 floor. If it is the timing in between, the self-diagnosis of all the photoelectric sensors can be performed twice. Thereby, it is possible to prevent performing unnecessary self-diagnosis at unnecessary timing. Therefore, the efficiency of self-diagnosis can be improved.

  Furthermore, if the desired timing is the timing when the passenger performs call registration and destination registration and the car moves and is between the floors, self-diagnosis can be performed simultaneously (collectively) for all photoelectric sensors. it can. As a result, the efficiency of the self-diagnosis can be improved and the time taken for the self-diagnosis can be shortened.

  In addition, the elevator can be operated after confirming the soundness of the position detection device every time call registration and destination registration are performed by a passenger. Therefore, it is possible to prevent the elevator from being operated in an unstable state in which the failure of the position detection device is latent. As a result, the safety of the elevator apparatus can be improved.

Embodiment 2. FIG.
In the configuration of the first embodiment, the self-diagnosis of the position detection device 30 is not performed correctly when the switching unit 44 does not switch due to the NC contact 44b of the switching unit 44 of the RL unit 40 being stuck and an open failure. Become. Therefore, in the second embodiment, a configuration that can also perform a self-diagnosis as to whether or not the RL unit 40 itself is functioning correctly will be described.

  FIG. 4 is a block diagram showing a position detection device 30 according to the second embodiment of the present invention. As shown in FIG. 4, one end of the NO contact 44 a is connected to the relay power supply 41 (positive side), and the other end is connected to the CPU 4 a via the RL1 photocoupler (safety relay transmission unit) 60. It is connected to the. The configuration of the RL1 photocoupler 60 is the same as that of the photocoupler 51 of the first embodiment.

  That is, an LED (light emitting diode) 60a serving as a light emitting element disposed on the primary side and a transistor 60b serving as a light receiving element disposed on the secondary side are configured. Other configurations are the same as those of the first embodiment.

  Next, the operation of the RL1 photocoupler 60 will be described. First, similarly to the self-diagnosis of the position detection device, the CPU 4a transmits a self-diagnosis start command to the driver IC 43 at a desired timing.

  For this reason, since the driver IC 43 is in the ON state, power is supplied to the coil 42 from the relay power supply 41. Along with this, the NO contact 44a of the switching unit 44 is turned on, and the NC contact 44b is turned off.

  As a result, the power supplied from the relay power supply 41 is supplied to the RL1 photocoupler 60 via the NO contact 44a. At this time, when an output signal (hereinafter referred to as a feedback signal) transmitted from the transistor 60b to the CPU 4a is switched from H level to L level, for example, the CPU 4a correctly switches the switching unit 44 of the RL unit 40. Can be diagnosed.

  On the other hand, when the feedback signal transmitted from the transistor 60b to the CPU 4a is not switched, the CPU 4a detects an abnormality of the switching unit 44 of the RL unit 40. That is, the RL1 photocoupler 60 transmits a feedback signal that varies depending on whether or not the switching unit 44 is switched according to a self-diagnosis start command to the CPU 4a.

  When the CPU 4a detects an abnormality in the switching unit 44, the CPU 4a transmits a signal for prompting maintenance and inspection to an elevator administrator and a maintenance company.

  As described above, according to the second embodiment, one end portion of the NO contact of the RL1 portion is connected to the CPU via the RL1 photocoupler. By providing such a configuration, it is possible to fix the NC contact and detect an open failure. Thereby, not only the self-diagnosis of whether or not the position detection device is broken, but also the self-diagnosis of whether or not the RL1 unit is broken can be performed. As a result, it is possible to further improve the reliability and safety of the elevator.

Embodiment 3 FIG.
In the first embodiment, when the car 7 is in the first state where the car 7 is stopped at the landing, all of the photoelectric sensors 31 cannot be self-diagnosed at the same time. Therefore, in the third embodiment, a position detection device capable of self-diagnosis of all the photoelectric sensors 31 simultaneously after the car 7 is stopped at the landing will be described. However, the configuration is the same as that of the first embodiment.

  A self-diagnosis method of the position detection device 30 in the first state where the car 7 is stopped at the landing will be described. When detecting from the position detection device 30 that the car 7 is stopped at the landing, the CPU 4a moves the car 7 by a distance equal to or longer than the preset height of the detection plate 32 in the elevator height direction. That is, the car 7 is moved from the first state to the position where the photoelectric sensor 31 is changed to the second state. The distance to which the car 7 is moved is detected and calculated by an encoder provided in the speed governor 5.

  After moving the car 7 from the landing, the CPU 4a issues a self-diagnosis start command to the driver IC 43. The subsequent operation is the same as that in the first embodiment, and the diagnosis is performed based on whether or not the level signal is switched from the L level to the H level when the switching unit 44 is switched.

  As described above, according to the third embodiment, when the CPU detects from the position detection device that the car is stopped at the landing when performing the self-diagnosis of the photoelectric sensor, the CPU detects the car. Move more than the length of. By providing such a configuration, it is not necessary to provide a separate device for self-diagnosis, and the self-diagnosis of all the position detection devices can be performed simultaneously with only the necessary devices originally provided in the operation of the elevator. Further, the minimum moving distance of the car that the CPU moves can be the length of the detection plate that is several tens of centimeters. As a result, it is possible to obtain an effect that self-diagnosis of all the position detection devices can be performed simultaneously without moving the car more than necessary.

  Note that the position detection device 30 of the third embodiment may be used for the position detection device 30 of the previous second embodiment.

Embodiment 4 FIG.
In the first to third embodiments, the plurality of photoelectric sensors 31 are connected to the common RL unit 40. In this configuration, when the RL unit 40 fails, all the photoelectric sensors 31 connected to the RL unit 40 are affected by the failure.

  Therefore, in the fourth embodiment, an example in which each photoelectric sensor 31 is connected to a separate RL unit 40 will be described. FIG. 5 is a block diagram showing a position detection device 30 according to the fourth embodiment of the present invention.

  As shown in FIG. 5, each photoelectric sensor 31 is connected to a separate RL unit 40. That is, N RL units 40 are provided in accordance with the number of photoelectric sensors 31. Other configurations are the same as those of the second embodiment.

  As described above, according to the fourth embodiment, each RL1 unit is connected to each photoelectric sensor. By providing such a configuration, even when one of the plurality of photoelectric sensors fails, it is possible to prevent the photoelectric sensors provided on the other floors from being affected.

  Therefore, since it can be confirmed that the sensor other than the photoelectric sensor that has detected the abnormality is operating normally, it is possible to eliminate the need for the operator to check everything when performing maintenance. As a result, the time required for maintenance can be reduced, and the labor of workers can be saved.

  DESCRIPTION OF SYMBOLS 1 Hoistway, 4 Control panel, 5 Speed governor, 31 Photoelectric sensor, 40 RL1 part (safety relay part), 44 Switching part, 50 transmission part, 60 RL1 photocoupler (safety relay transmission part).

Claims (7)

A plurality of photoelectric sensors, which are installed for each floor in the hoistway, detect the position of the elevator car, with the first state being the landing state and the second state not being landing;
The safety relay unit that can switch the power supplied to each of the plurality of photoelectric sensors to a power shut-off state by an external command, and the position of the elevator car by reading the sensor output from the plurality of photoelectric sensors in the power supply state As well as grasping and outputting a self-diagnosis start command as the external command to the safety relay unit at a desired timing, and reading the change state of the sensor output by the plurality of photoelectric sensors in the power-off state. An elevator car position detection device having a self-diagnosis function, comprising a control unit for self-diagnosis of the sensor output of the photoelectric sensor. Each of the plurality of photoelectric sensors is
It has a pair of light projecting part and light receiving part arranged oppositely,
When the light emitted from the light projecting unit is blocked by the detection plate provided on the elevator car side, the sensor output is the first state in which the light receiving unit cannot receive a light amount of a predetermined amount or more. Output,
When the light emitted from the light projecting unit is not blocked by the detection plate, the light receiving unit outputs the second state in which the light amount equal to or greater than the predetermined amount can be received as the sensor output,
In the power shut-off state, the first state is output as the sensor output by the absence of light emission from the light emitting unit,
The control unit outputs the self-diagnosis start command, so that the sensor output of the photoelectric sensor in which the light emitted from the light projecting unit to the light projecting unit is not blocked by the detection plate is The elevator car position detecting device having a self-diagnosis function according to claim 1, wherein when the state changes from the second state to the first state, the photoelectric sensor is diagnosed as normal. The control unit is connected to a contact of the safety relay unit that is switched on / off depending on whether the power is cut off or not, and reads the state of the contact in a state where the self-diagnosis start command is output. The elevator car position detecting device having a self-diagnosis function according to claim 1 or 2, wherein the power cut-off state is normally established. The safety relay unit is provided in common for the plurality of photoelectric sensors,
The self-diagnosis function according to any one of claims 1 to 3, wherein the control unit outputs the self-diagnosis start command to collectively turn the plurality of photoelectric sensors into the power-off state. Elevator car position detection device having. The safety relay unit is individually provided for the plurality of photoelectric sensors,
The control unit individually sets the plurality of photoelectric sensors in the power-off state by outputting individual self-diagnosis start commands corresponding to individually provided safety relay units. An elevator car position detecting device having the self-diagnosis function according to claim 1. When there is a photoelectric sensor that is in the first state because the car is stopped at the landing, the control unit performs the above operation until the photoelectric sensor changes from the first state to the second state. The elevator car having the self-diagnosis function according to any one of claims 1 to 5, wherein after the car is moved, the self-diagnosis is performed by outputting the self-diagnosis start command to the safety relay unit. Position detection device. A plurality of photoelectric sensors, which are installed for each floor in the hoistway, detect the position of the elevator car, with the first state being the landing state and the second state not being landing;
The safety relay unit that can switch the power supplied to each of the plurality of photoelectric sensors to a power shut-off state by an external command, and the position of the elevator car by reading the sensor output from the plurality of photoelectric sensors in the power supply state A self-diagnosis method of an elevator car position detection function executed in an elevator car position detection device having a self-diagnosis function with a control unit that performs self-diagnosis of the plurality of photoelectric sensors.
In the control unit,
A command transmission step for outputting a self-diagnosis start command to the safety relay unit at a desired timing as the external command, and reading a change state of sensor outputs by the plurality of photoelectric sensors in the power-off state. A self-diagnosis method for an elevator car position detection function, comprising a diagnostic step of performing a self-diagnosis of the sensor output of the photoelectric sensor.

Images