Novel absolute value control method for elevator

Abstract

The invention discloses a novel absolute value control method for an elevator, which is characterized in that a safety contact short circuit detection function is added in an absolute value encoder by comparing the sequence of current flowing through IN and OUT terminals of a safety contact OC. When it is detected that the safety contact OC is short-circuited, the absolute value encoder controls the safety contact OC to be disconnected and sends fault information to the control system. Meanwhile, in combination with an actual application scene, when emergency electric operation is completed and converted into an automatic state every time, if the control system receives fault information of the absolute value encoder, the control system actively inquires the fault type of the absolute value encoder, and if the absolute value encoder only feeds back an OC short-circuit fault, the control system gives an alarm. At the moment, the control system automatically sends an instruction to reset the fault, and the fault is not automatically reset under other conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of elevator control, and in particular relates to a novel absolute value control method for an elevator. Background Art

[0002] Absolute encoders have been increasingly used in elevator systems. Since the magnetic strip of the absolute encoder runs through the entire shaft, the position information it provides is not affected by power failure and power supply or wire rope slippage. The elevator system always obtains the current accurate position information of the elevator, which has obvious performance advantages.

[0003] Based on the traditional absolute encoder, its function is expanded and type tested. It can independently realize the safety protection function of the elevator and replace the traditional deceleration switch, limit switch, leveling switch and other configurations.

[0004] As an elevator safety protection device with a high safety level, the absolute encoder has the risk of its safety contact OC being short-circuited illegally in actual application. If this risk cannot be identified in a timely and effective manner, it will have a great impact on the safety of elevator operation. The existing technology lacks real-time and effective detection of the short-circuited safety contacts of the absolute encoder. In addition, since the absolute encoder can replace the limit switch, according to the elevator standard requirements, its safety contacts need to be short-circuited by the emergency electric switch for reset. Therefore, while the absolute encoder adds the safety contact OC short-circuit detection function, it is necessary to solve the problem that the absolute encoder frequently reports OC short-circuit faults and cannot work normally.

[0005] Therefore, a new absolute value control method for elevators is urgently needed. Summary of the invention

[0006] In order to solve the defects of the prior art, the present invention provides a novel absolute value control method for an elevator.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: The invention provides a novel absolute value control method for an elevator, comprising the following steps: during normal operation, an absolute value encoder performs real-time short-circuit detection, the wiring of a safety contact OC of the absolute value encoder includes IN and OUT, and the detection step is: during power-on, if the absolute value encoder detects that only IN has current, the safety contact OC is controlled to be closed, and the absolute value encoder works normally at this time; during power-on, if the absolute value encoder detects that IN and OUT are energized at the same time, it is judged that IN and OUT of the safety contact OC are short-circuited, and the absolute value encoder controls the safety contact OC to be disconnected, and sends fault information to a control system, the short-circuit fault must be eliminated, and a manual reset operation must be performed, and the safety contact OC of the absolute value encoder can resume conduction, and the elevator can resume normal operation.

[0008] Preferably, the following steps are also included: when the elevator emergency electric operation ends and turns to normal state, if the control system receives fault information from the absolute encoder, the control system will actively inquire about the fault type of the absolute encoder. If the absolute encoder feedback only has an OC short-circuit fault, it means that the fault is caused by the emergency electric operation just now short-circuiting the safety contact OC. At this time, the control system will automatically issue an instruction to reset the fault; if the absolute encoder feedback shows other fault types, the control system will not automatically reset the fault.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds a safety contact short-circuit detection function inside the absolute encoder by comparing the order of current flowing through the IN and OUT terminals of the safety contact OC. When it is detected that the safety contact OC is short-circuited, the absolute encoder controls the safety contact OC to disconnect and sends the fault information to the control system. At the same time, the present invention combines the actual application scenario. Each time the emergency electric operation is completed and turned to the automatic state, if the control system receives the fault information of the absolute encoder, the control system will actively inquire about the fault type of the absolute encoder. If the absolute encoder feedback only has an OC short-circuit fault, the control system will automatically issue an instruction to reset this fault at this time. In other cases, the fault will not be automatically reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a circuit diagram of the absolute value encoder in the present invention. DETAILED DESCRIPTION

[0011] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0012] In the description of the present invention, it should be understood that the terms "left" and "right" indicate directions or positional relationships based on the accompanying drawings. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0013] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] This embodiment provides a novel absolute value control method for an elevator, comprising the following steps: During normal operation, the absolute encoder performs real-time short-circuit detection. The wiring of the absolute encoder's safety contact OC includes IN and OUT. The detection steps are: when powered on, if the absolute encoder detects that only IN has current, it controls the safety contact OC to close, and the absolute encoder works normally at this time; when powered on, if the absolute encoder detects that IN and OUT are energized at the same time, it is judged that IN and OUT of the safety contact OC are short-circuited. At this time, the absolute encoder controls the safety contact OC to disconnect and sends the fault information to the control system. The short-circuit fault must be eliminated and a manual reset operation must be performed before the absolute encoder safety contact OC can resume conduction and the elevator can resume normal operation.

[0015] like Figure 1 As shown, each time the emergency electric switch SAF is actuated, the safety circuit will be cut off, and the IN and OUT of the absolute encoder safety contact OC will be short-circuited. When the emergency electric operation SBPR and the up button SBPU (or the down button SBPD) are pressed at the same time, the entire safety circuit is connected, and the IN and OUT of the absolute encoder are energized at the same time, so that the safety contact OC of the absolute encoder is always in the disconnected position, and the control system reports a fault. Since the elevator is allowed to continue to operate in the emergency electric operation mode at this time, the disconnection of the safety contact OC will not affect the emergency electric operation. However, each time the emergency electric operation is completed and turned to the normal state, the safety circuit is in the disconnected state due to the disconnection of the OC contact, and a manual reset operation must be performed to restore the elevator to normal operation, which is not convenient for practical application. To solve this problem, this embodiment performs the following control steps: When the elevator emergency electric operation ends and turns to normal state, if the control system receives the fault information of the absolute encoder, the control system will actively inquire about the fault type of the absolute encoder. If the absolute encoder feedback only has OC short-circuit fault, it means that this fault is caused by the emergency electric operation short-circuiting the safety contact OC. At this time, the control system will automatically issue a command to reset this fault; if the absolute encoder feedback has other fault types, the control system will not automatically reset the fault. At this time, if the safety contact OC is indeed short-circuited, after the reset is completed, the IN and OUT of the safety contact OC are energized at the same time, resulting in an inability to perform an effective reset, thereby ensuring reset safety.

[0016] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel absolute value control method for an elevator, characterized in that: The following steps are involved: During normal operation, the absolute encoder performs real-time short-circuit detection. The wiring of the absolute encoder's safety contact OC includes IN and OUT. The detection steps are: when powered on, if the absolute encoder detects that only IN has current, it controls the safety contact OC to close, and the absolute encoder works normally at this time; when powered on, if the absolute encoder detects that IN and OUT are energized at the same time, it is judged that IN and OUT of the safety contact OC are short-circuited. At this time, the absolute encoder controls the safety contact OC to disconnect and sends the fault information to the control system. The short-circuit fault must be eliminated and a manual reset operation must be performed before the absolute encoder safety contact OC can resume conduction and the elevator can resume normal operation.

2. The new absolute value control method for elevator according to claim 1, characterized in that: The following steps are also included: When the elevator emergency electric operation ends and returns to normal state, if the control system receives fault information from the absolute encoder, the control system will actively inquire about the fault type of the absolute encoder. If the absolute encoder feedback only has an OC short-circuit fault, it means that the fault is caused by the emergency electric operation short-circuiting the safety contact OC. At this time, the control system will automatically issue a command to reset the fault; if the absolute encoder feedback shows other fault types, the control system will not automatically reset the fault.

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