Escalator strong and weak current cable wiring system

Abstract

The application discloses an automatic escalator strong and weak current cable wiring system, comprising: a strong and weak current partition wiring architecture, which is used for dividing the internal cables of an automatic escalator machine room and a truss into independent strong current electrical wiring areas and weak current electrical wiring areas according to voltage grades and functions; and a potential isolation module, which is arranged between electrical reference ends of the strong current electrical wiring areas and the weak current electrical wiring areas, and is used for realizing strong and weak current reference potential electrical isolation and blocking the conduction of strong current side voltage fluctuation and low frequency noise to a weak current loop. The application solves the problems of existing escalator strong and weak current mixed interference, unreasonable grounding, uncontrollable wiring acceptance and the problem that a unified scheme cannot be adapted to multiple models and multiple scenes.

Description

Technical Field

[0001] This invention relates to the field of elevators, and more specifically to a wiring system and method for power and data cables in escalators. Background Technology

[0002] like Figure 1 As shown, the current domestic commercial escalator manufacturing and on-site wiring processes commonly employ a mixed cable laying method. Multiple types of cables are simultaneously laid inside the escalator machine room and in areas where the truss passes through. These include high-voltage power lines such as inverter output cables, main power supply cables, and drive motor power cables, as well as low-voltage power lines such as DC 24V safety protection circuit cables, various photoelectric and contact sensor signal lines, human-machine interface circuits, and 485 / CAN fieldbus communication cables. These two types of cables with different voltage levels and functions are laid in close parallel and intertwined, and in some areas, they are even bundled together. During the operation of the high-voltage inverter lines, the voltage and current continuously and dynamically change, creating an alternating electromagnetic field in the surrounding area. This field generates continuous electromagnetic interference to the low-voltage lines through spatial radiation, capacitive coupling, and inductive coupling, leading to a series of malfunctions. Existing anti-interference solutions in the industry have significant technical shortcomings: one approach involves replacing cables with high-grade shielded cables, which is costly and only reduces spatial radiation interference, failing to address potential crosstalk and common-mode interference—a superficial solution. Another approach involves adding metal isolation barriers and independent mechanical cable trays, requiring modifications to the escalator's mechanical structure, increasing equipment weight, and occupying cabling space; these solutions are unsuitable for compact escalators and lead to cumbersome maintenance. None of these solutions address the interference problem at its root causes—electrical topology, potential isolation, and grounding logic. Relevant publicly available literature includes CN218182907U, CN219839345U, and CN201721383381.X.

[0003] Meanwhile, current escalator wiring acceptance relies entirely on manual visual inspection, which cannot identify hidden wiring hazards such as mixed high-voltage and low-voltage connections, incorrect grounding points, and potential deviations. The long-term accumulation of these hazards can lead to serious faults such as cable insulation aging, localized overheating, short circuits, and controller port burnout. Furthermore, these faults are passively triggered, difficult to locate, and result in significant downtime losses. In addition, industry-standard testing methods have fixed parameters, which cannot adapt to the wiring complexity of different escalator models, ranging from light commercial to heavy-duty passenger flow, leading to false alarms and missed detections.

[0004] In addition, the current escalator low-voltage electrical systems generally adopt a common ground architecture for strong and low-voltage electrical systems, such as... Figure 2 As shown, voltage fluctuations and noise generated by high-voltage start-up and shutdown, load changes, and frequency converter commutation will couple to all low-voltage circuits through the common ground. The common ground of multiple low-voltage circuits causes ground potential shift and common-mode interference, which significantly reduces the signal-to-noise ratio of low-voltage signals. The interference problem is particularly prominent in heavy-load and high-passenger-flow scenarios.

[0005] In addition, the industry's unified cabling standards do not differentiate between escalator models, power ratings, and the number of circuits, nor do they differentiate between the typical electromagnetic scenarios in shopping malls and the complex and strong electromagnetic scenarios in subways. Small escalators lack sufficient space to achieve effective isolation, while large, heavy-duty escalators have poor heat dissipation due to clustered cables, insufficient anti-interference capabilities in complex scenarios, poor adaptability of unified design solutions, inconsistent assembly quality of new machines, and the inability to guarantee the effectiveness of retrofitting existing equipment.

[0006] In summary, existing technologies suffer from several technical defects, including unresolved electromagnetic interference sources, high mechanical modification costs, unreliable manual acceptance, severe grounding interference, and poor adaptability to different models and scenarios. There is an urgent need for an anti-interference wiring system for escalators that features pure electrical optimization, layered isolation, customizable adaptation for multiple operating conditions, and pre-installed self-testing interlocking. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a layered electrical isolation and anti-interference wiring system and control method for strong and weak current cables of escalators, which solves the problems of mixed strong and weak current interference, unreasonable grounding, uncontrollable wiring acceptance, and the inability of a unified solution to adapt to multiple models and scenarios in existing escalators.

[0008] To address the aforementioned technical problems, this invention provides an escalator power and low-voltage cable wiring system, comprising: a power and low-voltage zoned wiring architecture, used to divide the cables inside the escalator machine room and truss into mutually independent power electrical wiring areas and low-voltage electrical wiring areas according to voltage level and function; and a potential isolation module, located between the electrical reference terminals of the power electrical wiring area and the low-voltage electrical wiring area, used to achieve electrical isolation between the power and low-voltage reference potentials, and to block voltage fluctuations and low-frequency noise from the power side from being conducted to the low-voltage circuit.

[0009] Preferably, the high-voltage electrical wiring area only contains three types of high-voltage alternating power lines: inverter input / output cables, main power supply cables for equipment, and drive motor power cables; the low-voltage electrical wiring area only contains five types of low-voltage signal lines: safety circuit cables, sensor signal lines, photoelectric detection cables, human-machine interaction cables, and CAN bus communication cables.

[0010] Preferably, the potential isolation module is a rail-mounted passive electrical component that integrates an isolation inductor and a resistor-capacitor filter network. The terminals on the strong and weak current sides have no direct conductor connection, thus forming double electrical isolation.

[0011] Preferably, the potential isolation module is divided into a conventional type suitable for the normal electromagnetic environment of shopping malls and a high isolation type suitable for the complex electromagnetic environment of subways, and can be directly mounted on the standard DIN rail of the control cabinet.

[0012] Preferably, the system also includes an independent low-voltage grounding unit, which is used to construct a dedicated reference ground for the low-voltage system, so that the low-voltage reference ground is completely electrically isolated from the escalator's high-voltage protection ground and the rack ground.

[0013] Preferably, the independent low-voltage grounding unit gathers all low-voltage circuit grounding terminals and the negative busbar of the switching power supply to form a unique common reference point for low-voltage circuits; the low-voltage grounding trunk line and grounding point are electrically isolated from the escalator high-voltage grounding network and metal frame throughout the entire process. Preferably, the independent low-voltage grounding unit can adapt to different load fluctuation conditions, with standard grounding discharge parameters configured for light commercial escalators and optimized grounding impedance and transient interference discharge parameters for heavy-duty escalators with large passenger flow.

[0014] Preferably, the system also includes a wiring electrical self-test module for fully automatic pre-detection of wiring hazards and power-on interlock safety control.

[0015] Preferably, the wiring electrical self-test module covers multi-dimensional detection of the continuity of the entire cable circuit, compliance of the line layout, point potential values, and grounding conditions; the wiring electrical self-test module is connected in series to the escalator's main power-on control circuit, and when it detects wiring hazards such as mixed strong and weak current connections, excessive potential, or abnormal grounding, it automatically locks the power-on circuit, prohibits the equipment from starting, and outputs a classified fault prompt.

[0016] Preferably, the wiring electrical self-test module has parameter adaptation logic for different models and scenarios; it adopts a basic sampling frequency and standard judgment threshold for light commercial escalators with simple circuits; it increases the sampling frequency and refines the judgment range for heavy-duty escalators with complex circuits to improve detection accuracy; it increases the fault response speed for subway scenarios with high passenger flow, and adopts a standard response speed for regular scenarios in shopping malls.

[0017] Preferably, the system has a reserved parameter fine-tuning interface, which can adaptively fine-tune the sampling point position and local wiring layout according to the selection of external equipment for the escalator and the number of newly added circuits.

[0018] A method for wiring power and data cables for escalators includes the following steps: S1. Implement physical zoning wiring for strong and weak current in escalator machine rooms and truss wiring channels, and strictly distinguish the ownership of strong power lines and weak signal lines. S2. Install a potential isolation module on the control cabinet rail to isolate strong and weak electrical reference potentials and block potential crosstalk and noise propagation paths. S3. Modify the escalator grounding architecture, disconnect the original common grounding connection of the low-voltage and high-voltage systems, and construct a dedicated low-voltage reference ground through an independent low-voltage grounding unit; S4. After the equipment is powered on, the wiring electrical self-test module will be activated first to automatically detect the electrical compliance status of all cables. S5. If the test is passed, the power-on interlock will be released, and the escalator will start and stop normally. If the test is abnormal, the power-on circuit will be locked and a fault code will be output. The escalator can only be put into use after rectification and re-inspection. S6. During normal operation of the equipment, the self-test module continuously monitors in the background and provides early warnings for hidden dangers such as aging lines and poor contact.

[0019] This invention achieves complete physical separation between power lines and signal lines by dividing the computer room and truss cabling area into completely independent strong and weak current cabling zones, thus reducing spatial electromagnetic coupling interference. It also achieves electrical isolation of strong and weak current reference potentials by adding a rail-mounted potential isolation module, blocking potential crosstalk and low-frequency noise propagation. Furthermore, it completely eliminates the shared grounding architecture for strong currents by reconstructing an independent weak current grounding system, thus eliminating ground potential deviation and common-mode interference. Finally, it replaces manual visual inspection with a pre-power-on fully automatic electrical self-test and power-on interlocking mechanism, enabling proactive cabling hazard detection, abnormal start-up prevention, and accurate fault indication.

[0020] Meanwhile, this invention matches differentiated wiring dimensions, line spacing, grounding parameters, and detection parameters for two types of escalators: light commercial escalators and heavy passenger flow escalators. It also selects different isolation level modules and response logic for common electromagnetic scenarios in shopping malls and strong electromagnetic scenarios in subway hubs, achieving model-specific and scenario-customized adaptation, taking into account the needs of new mass production and existing renovation scenarios.

[0021] The present invention has the following beneficial effects: This invention significantly reduces non-fault-related downtime and ensures stable transportation order in public areas. Compared to traditional shielded cable replacement and mechanical baffle isolation solutions, this invention requires no cable replacement, no addition of isolation mechanical components, and no alteration to any mechanical structure of the escalator. It is simple to construct, has low material costs, and can be used for standardized mass production assembly of new machines as well as for rapid modification of existing escalator lines. Attached Figure Description

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of existing cable mixing technology.

[0023] Figure 2 This is a schematic diagram of a traditional power and data cable grounding system.

[0024] Figure 3 This is a flowchart illustrating the workflow of the power and data cable wiring system for the escalator of this invention. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. Example 1

[0026] This embodiment is used to achieve physical partitioning and electrical potential isolation of strong and weak current lines in escalator machine rooms and truss areas, and is suitable for two types of machine models and two types of application scenarios.

[0027] First, the cabling area is planned. Inside the escalator machine room and along the truss passageway, separate high-voltage and low-voltage electrical cabling areas are defined. The cabling channels in these two areas are completely independent, with no intersections or shared paths. Considering the compact space of light commercial escalators, the partition width is appropriately reduced while maintaining complete isolation, and the cabling is laid out in a denser configuration. For heavy-duty escalators with ample cabling space, the partition size and cable spacing are widened to improve isolation and heat dissipation.

[0028] Strictly enforce the cable zoning rules: only three-phase main power supply cables, inverter input and output cables, and drive motor power cables should be laid in the high-voltage area; only DC24V safety circuits, sensor signal lines, photoelectric detection lines, human-machine interaction lines, and 485 / CAN bus communication lines should be laid in the low-voltage area. Cross-zone insertion, mixing, and misalignment are strictly prohibited.

[0029] The control cabinet houses a potential isolation module mounted on a standard DIN rail. The module is a passive rail-mounted structure, requiring no modifications to the cabinet structure. The left-side terminal connects to the common reference bus for high-voltage circuits, and the right-side terminal connects to the common reference bus for low-voltage circuits. Internally, a dual electrical isolation system—without direct conductor connection—is achieved through an isolation inductor and a RC filter network. For specific application scenarios, standard potential isolation modules are used in typical electromagnetic environments like shopping malls; high-isolation potential isolation modules are selected for strong electromagnetic and high-interference scenarios such as subways and train stations, enhancing clutter suppression and potential isolation capabilities.

[0030] After the wiring is completed, visual inspection of each area is combined with electrical self-testing to ensure complete isolation between strong and weak current spaces and no crosstalk between potentials, thus achieving dual suppression of electromagnetic radiation interference and potential conduction interference. Example 2

[0031] This embodiment reconstructs the low-voltage grounding architecture of the escalator, completely resolving the ground potential shift and common-mode interference problems caused by the shared grounding of strong and weak currents.

[0032] The original low-voltage circuit terminal layout and power supply wiring method are retained without altering the original wiring structure of the equipment; the original connection jumpers between the negative terminal of the switching power supply, the low-voltage common reference point and the escalator frame and the high-voltage protective ground are disconnected to achieve complete physical and electrical separation between the low-voltage and high-voltage grounding networks.

[0033] An independent low-voltage grounding unit is installed in the control cabinet. All low-voltage circuit grounding terminals and the negative busbar of the switching power supply are uniformly connected to the independent low-voltage grounding unit to construct a unique and exclusive reference ground for the low-voltage system. The low-voltage grounding trunk line and grounding point are kept away from the escalator metal frame and the high-voltage grounding system throughout the entire process.

[0034] Differentiated parameter configurations are implemented for different models: light commercial escalators have smooth load fluctuations and adopt standard grounding impedance and discharge parameters to meet conventional anti-interference requirements; heavy passenger flow escalators have frequent starts and stops, long-term full loads, and drastic dynamic load changes, so the discharge circuit parameters inside the grounding unit are optimized to improve the suppression of instantaneous noise and ground potential fluctuations and adapt to high-intensity working conditions.

[0035] This embodiment only modifies the grounding jumper logic, which is simple to construct, requires no mechanical modifications, and does not affect the original functions of the equipment. It can quickly complete the standardized upgrade of the grounding system of the old and new escalators. Example 3

[0036] This embodiment achieves fully automated pre-detection of wiring hazards and power-on interlock safety control. The process is as follows: Figure 3 As shown.

[0037] The wiring electrical self-test module deploys sampling points in parallel at the beginning, end, and key electrical terminals of all cables, covering the continuity of strong and weak current circuits, compliance of line zoning, real-time potential values, and grounding conditions, with no blind spots. The self-test module's output interlocking contacts are connected in series to the escalator's main power-on control circuit, forming a hardware-level power-on lockout protection.

[0038] Configure differentiated detection parameters: For light escalators with few circuits and simple wiring, use basic sampling frequency, standard voltage, and grounding judgment threshold to avoid false alarms caused by redundant sampling; for heavy-duty escalators with complex circuits and many signal types, increase the sampling frequency and refine the parameter judgment range to improve the accuracy of identifying potential hazards in complex circuits; for high-reliability scenarios with large passenger flow in subways, increase the fault detection response speed to achieve rapid hazard identification; for regular scenarios in shopping malls, use a standard response speed to balance stability and smooth equipment operation.

[0039] After the equipment is powered on, a self-test process is triggered first. The module collects real-time electrical data and compares it with the machine's standard parameters. If the data meets the rules, the interlock is automatically released, and the escalator enters normal standby operation. If potential hazards such as mixed strong and weak current connections, excessive potential, or abnormal grounding are detected, the power-on circuit is immediately locked, the equipment is prohibited from starting, and the human-machine interface outputs classification codes for mixed connections, abnormal potentials, and grounding faults to guide maintenance personnel in targeted rectification. After rectification is completed, the equipment is re-powered on for self-testing, and can only be put into operation after passing the verification.

[0040] During normal equipment operation, the module continuously monitors the background and can identify hidden deterioration problems such as cable aging and poor contact in advance, achieving full-cycle safety protection. Example 4

[0041] This embodiment demonstrates the combined application and batch implementation specifications of the four-layer protection system.

[0042] The entire system is constructed according to a standardized process of strong and weak current physical zoning wiring → potential isolation module installation → independent weak current grounding modification → power-on self-test parameter adaptation and interlocking debugging, forming a complete four-layer protection system of spatial isolation, potential isolation, grounding anti-interference, and power-on pre-verification.

[0043] During the mass production phase of the new machine, the corresponding partition dimensions, module specifications, grounding parameters, and self-inspection thresholds are matched according to the escalator model drawings. After the entire machine is assembled, each machine undergoes a full electrical test. Only after passing the test can the machine be put into storage to ensure the consistency of batch product quality.

[0044] During the renovation of existing escalators, the existing mixed cables are organized, the zoning layout is rebuilt, the grounding structure is modified, potential isolation modules are installed, and the self-test parameters are adjusted and adapted. The entire process does not involve replacing the original cables or altering the mechanical structure of the escalators, resulting in low renovation costs and quick results.

[0045] Meanwhile, the system reserves a parameter fine-tuning interface, which can fine-tune the sampling channel and judgment parameters according to the selection of escalator peripherals and the number of new circuits, to adapt to personalized selection conditions; and it also compiles detailed construction guidelines for different models and scenarios to unify the operation standards of the entire process of production, maintenance and renovation, greatly improving the versatility and implementability of the solution.

[0046] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A wiring system for power and data cables for escalators, characterized in that, include: The strong and weak current zoned cabling architecture is used to divide the cables in the escalator machine room and truss into independent strong current electrical cabling areas and weak current electrical cabling areas according to voltage level and function. The potential isolation module is located between the electrical reference terminals of the high-voltage electrical wiring area and the low-voltage electrical wiring area. It is used to achieve electrical isolation between the reference potentials of the high-voltage and low-voltage circuits and to block voltage fluctuations and low-frequency noise from the high-voltage side from being conducted to the low-voltage circuit.

2. The escalator power and data cable wiring system according to claim 1, characterized in that, The high-voltage electrical wiring area only includes three types of high-voltage alternating power lines: inverter input / output cables, main power supply cables for equipment, and drive motor power cables. The low-voltage electrical wiring area only includes five types of low-voltage signal lines: safety circuit cables, sensor signal lines, photoelectric detection cables, human-machine interaction cables, and CAN bus communication cables.

3. The escalator power and data cable wiring system according to claim 1, characterized in that, The potential isolation module is a rail-mounted passive electrical component that integrates an isolation inductor and a resistor-capacitor filter network. There is no direct conductor connection between the strong and weak current side terminals, forming double electrical isolation.

4. The escalator power and data cable wiring system according to claim 3, characterized in that, The potential isolation module is divided into a conventional type suitable for the normal electromagnetic environment of shopping malls and a high isolation type suitable for the complex electromagnetic environment of subways. It can be directly installed on the standard DIN rail of the control cabinet.

5. The escalator power and data cable wiring system according to claim 1, characterized in that, Also includes: An independent low-voltage grounding unit is used to construct a dedicated reference ground for the low-voltage system, ensuring complete electrical isolation between the low-voltage reference ground and the escalator's high-voltage protective ground and rack ground.

6. The escalator power and data cable wiring system according to claim 5, characterized in that, The independent low-voltage grounding unit gathers all low-voltage circuit grounding terminals and the negative busbar of the switching power supply to form a unique common reference point for low-voltage circuits; the low-voltage grounding trunk line and grounding point are electrically isolated from the escalator high-voltage grounding network and metal frame throughout the entire process.

7. The escalator power and data cable wiring system according to claim 6, characterized in that, The independent low-voltage grounding unit can adapt to different load fluctuation conditions. It is configured with standard grounding discharge parameters for light commercial escalators and optimized for grounding impedance and transient interference discharge parameters for heavy-duty escalators with large passenger flow.

8. The escalator power and data cable wiring system according to claim 1 or 5, characterized in that, Also includes: The wiring electrical self-test module is used for fully automatic pre-detection of wiring hazards and power-on interlock safety management.

9. The escalator power and data cable wiring system according to claim 8, characterized in that, The wiring electrical self-test module covers multi-dimensional detection of the continuity of the entire cable circuit, compliance of the line layout, point potential values, and grounding conditions. The wiring electrical self-test module is connected in series to the escalator's main power-on control circuit. When it detects hidden dangers such as mixed strong and weak current connections, excessive potential, or abnormal grounding wiring, it automatically locks the power-on circuit, prohibits the equipment from starting, and outputs classified fault prompts.

10. The escalator power and data cable wiring system according to claim 8, characterized in that: The wiring electrical self-test module has parameter adaptation logic for different models and scenarios; it adopts a basic sampling frequency and standard judgment threshold for light commercial escalators with simple circuits; it increases the sampling frequency and refines the judgment range for heavy-duty escalators with complex circuits to improve detection accuracy; it increases the fault response speed for subway scenarios with high passenger flow, and adopts a standard response speed for regular scenarios in shopping malls.

11. The escalator power and data cable wiring system according to claim 1, characterized in that: The system has a reserved parameter fine-tuning interface, which can adaptively fine-tune the sampling point position and local wiring layout according to the selection of external equipment on the escalator and the number of newly added circuits.

12. A method for wiring power and data cables for escalators, comprising: S1. Implement physical zoning wiring for strong and weak current in escalator machine rooms and truss wiring channels, and strictly distinguish the ownership of strong power lines and weak signal lines. S2. Install a potential isolation module on the control cabinet rail to isolate strong and weak electrical reference potentials and block potential crosstalk and noise propagation paths. S3. Modify the escalator grounding architecture, disconnect the original common grounding connection of the low-voltage and high-voltage systems, and construct a dedicated low-voltage reference ground through an independent low-voltage grounding unit; S4. After the equipment is powered on, the wiring electrical self-test module will be activated first to automatically detect the electrical compliance status of all cables. S5. If the test is passed, the power-on interlock will be released, and the escalator will start and stop normally. If the test is abnormal, the power-on circuit will be locked and a fault code will be output. The escalator can only be put into use after rectification and re-inspection. S6. During normal operation of the equipment, the self-test module continuously monitors in the background and provides early warnings for hidden dangers such as aging lines and poor contact.

Images