CN104355196A - Remote monitoring system for elevator failures - Google Patents
Remote monitoring system for elevator failures Download PDFInfo
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- CN104355196A CN104355196A CN201410613444.2A CN201410613444A CN104355196A CN 104355196 A CN104355196 A CN 104355196A CN 201410613444 A CN201410613444 A CN 201410613444A CN 104355196 A CN104355196 A CN 104355196A
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- frequency converter
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
Abstract
The invention relates to a remote monitoring system for elevator failures. The remote monitoring system is characterized in that a failure information receiving communication network is mainly formed by a PLC (Programmable Logic Controller), a frequency converter, a GPRS (General Packet Radio Service) communication module, a data display terminal and a remote platform server; the PLC, the frequency converter and the data display terminal are respectively connected with the GPRS communication module through RS485 ports; the GPRS communication module exchanges data with the remote platform server in a wireless GPRS mode; the status information of the PLC and the frequency converter and the data of failure data are switched between the data display terminal and the remote platform server. The remote monitoring system has the beneficial effects that the running status and the failure information of an elevator can be collected in real time. When the failures occur, the failure information is sent to a monitoring platform and maintenance people through a wireless network, and related people quickly respond and arrive at the scene. After the maintenance people arrive at the scene, the detailed information of the evaluator failures are understood through the data display terminal, and failure causes can be determined instantly in short time.
Description
Technical field
The invention belongs to industrial automatic control, particularly relate to a kind of elevator malfunctions long distance control system.
Background technology
Elevator and elevator, be the upper and lower lifting machinery of a kind of conveying people and goods, belong to special equipment, its normal safe operational relation, to the personal safety of passenger, is therefore subject to great attention.First, during elevator et out of order, repair and maintenance personnel need the scene of arriving in the very nick of time, and eliminate fault, recover the normal operation of elevator as early as possible; In addition, repair and maintenance personnel also need regularly to carry out Check and Maintenance to elevator; Finally, user and repair and maintenance personnel need to record the running condition of elevator and add up.
At present, because elevator does not possess remote communications capability, the use flow process of elevator is as follows: first, and when elevator et out of order, first passenger finds and report to the police, and notifies that related personnel shows up solution.After repair and maintenance personnel reach the spot, first make passenger get rid of poverty, then progressively looking up the fault reason, trouble-shooting, recover the normal operation of elevator.Secondly, repair and maintenance personnel in routine inspection handling labor, according to set code work.Finally, user and repair and maintenance personnel carry out hand-kept and statistics to the operation of elevator and service condition.The work efficiency of above three aspects is lower, is mainly manifested in the following aspects: first, during elevator faults, if nobody sends alerting signal or signal is not smooth, can find delayed by causing trouble, cause incuring loss through delay rescue time, reduce failure response speed; Secondly, repair and maintenance staff uses conventional methods and checks, and cannot value fault time elevator operation, work efficiency is lower; Finally, user and repair and maintenance personnel carry out hand-kept to the operation of elevator and failure condition, may occur failing to record the situation of incorrect posting, and cannot record trouble time every operational factor for reference, the reference provided the repair and maintenance work in future is limited.
Summary of the invention
The present invention is to overcome deficiency of the prior art, provides a kind of elevator malfunctions long distance control system, can the running state of Real-time Collection elevator and failure message.During elevator et out of order, send failure message by wireless network, repair and maintenance personnel understand the details of elevator malfunctions by video data terminal, increase work efficiency.
The present invention for achieving the above object, be achieved through the following technical solutions, a kind of elevator malfunctions long distance control system, it is characterized in that: primarily of PLC, frequency converter, GPRS communication module, video data terminal and remote platform server form failure message and receive communication network, described PLC, frequency converter is connected with GPRS communication module respectively by RS485 port with video data terminal, described GPRS communication module and remote platform server exchange data by wireless GPRS mode, the status information of PLC and frequency converter and the data of failure message are exchanged between video data terminal and remote platform server.
Described remote platform server has fixing IP or internet domain name, IP and domain-name information are pre-configured in GPRS communication module, adopt between described GPRS communication module and remote platform server udp protocol exchange data, data comprise the identification of convenient service device end software device id, data time stamp and frame number information.
Described data exchange adopts MODBUS agreement in data link layer, possesses CRC16 verification.
Described GPRS communication module has three RS485 serial data channels that are independent and isolation, and it is connected with PLC, frequency converter, read-out respectively, and each passage possesses independently communications parameter.
Beneficial effect: compared with prior art, the present invention overcomes that existing maintenance of lifter efficiency is low, communication is obstructed and without the deficiency of operational information recording, can the running state of Real-time Collection elevator and failure message.During et out of order, send failure message to monitor supervision platform and repair and maintenance personnel by wireless network, related personnel reacts rapidly, reaches the spot.After repair and maintenance personnel reach the spot, understood the details of elevator malfunctions by video data terminal, can determine fault cause in the short time, work efficiency improves greatly.Repair and maintenance personnel and user, in daily inspection and maintenance work, by the display of monitor supervision platform or the display of video data terminal, can understand the running condition of elevator in more detail, carry out analysis and judge, process in advance the potential fault of elevator.Remote monitoring platform runs automatically, the operation information of Real-time Collection elevator and failure message are also recorded in data bank, and user and repair and maintenance personnel all conduct interviews by internet, understand the various information of elevator, information persistence, user friendlyly consults and general analyzes.Be applicable to the elevator installed in bank bridge elevator and other application apparatus.
Accompanying drawing explanation
Fig. 1 is communication connection diagram of the present invention;
Fig. 2 is the communication part anatomical connectivity block diagram of the embodiment of the present invention;
Fig. 3 is GPRS communication module workflow diagram;
Fig. 4 is the electrical schematic diagram of the embodiment of the present invention;
Fig. 5 is the photoelectric encoder erection plan of embodiment;
Fig. 6 is the cabinet outside drawing of the embodiment of the present invention;
In Fig. 4: VS: frequency converter PLC: Programmable Logic Controller, EC1: photoelectric encoder CM1:GPRS communication module, DP1: video data terminal; JXW: phase sequence protective relay, QL1/QL2: rectifier bridge, YB: magnet stopper; TC: control transformer, ANT1: antenna, MCS1: magnet-sensitive switch
In Fig. 5: 11, three phase asynchronous motor, 12, electric machine main shaft, 13. photoelectric encoders, 14, reductor;
In Fig. 6: 1, controller cabinet, 2, emergency stop button switch, 3, lighting switch, 4, inspection switch, 5, button in step, 6, the lower button of step, 7, ventilation inlet, 8, discharge port, 9, air outlet.
Detailed description of the invention
Below in conjunction with preferred embodiment, to according to detailed description of the invention provided by the invention, details are as follows: embodiment
Refer to accompanying drawing 1,2, the invention provides a kind of elevator malfunctions long distance control system, form failure message primarily of PLC, frequency converter, GPRS communication module, video data terminal and remote platform server and receive communication network, described PLC, frequency converter are connected with GPRS communication module respectively by RS485 port with video data terminal, described GPRS communication module and remote platform server exchange data by wireless GPRS mode, exchange the status information of PLC and frequency converter and the data of failure message between video data terminal and remote platform server.Described remote platform server has fixing IP or internet domain name, IP and domain-name information are pre-configured in GPRS communication module, adopt between described GPRS communication module and remote platform server udp protocol exchange data, data comprise the identification of convenient service device end software device id, data time stamp and frame number information.Described data exchange adopts MODBUS agreement in data link layer, possesses CRC16 verification.Described GPRS communication module has three RS485 serial data channels that are independent and isolation, and it is connected with PLC, frequency converter, read-out respectively, and each passage possesses independently communications parameter.
Failure message receives communication network and comprises two parts, and wherein remote platform server is arranged in the machine room of user, and remaining part is all installed and elevator sites.Wherein PLC, frequency converter and GPRS communication module are arranged in elevator electric control box, and video data terminal is arranged in car; Situ part adopts RS485 communication, is connected between communication module and remote platform server by GPRS/Internet.Original in PLC and frequency converter, original data comprise the IO dotted state of PLC, inner key variables, fault-alarming state, running state etc., and data of frequency converter comprises running state, operating data, fault state data, logout etc.Above data can increase and decrease as required, and hardware does not need to change.The remote platform server of user's machine room is a special server host, has applied for independently static ip address, can carry out communication like this with the GPRS terminal at scene.User by being connected to the network terminal of Internet, as computer, notebook, mobile phone etc., can the data of access data services device.The handler with super-ordinate right can the long-range maintenance carrying out server program.When elevator et out of order, data server can send the specific user of message notice automatically.If when user is inconvenient to scene at ordinary times, by any computer or network terminal access platform data, the running condition of elevator can be understood, the historical record data that elevator runs can also be inquired about, for next step work provides foundation.
Hardware is formed:
Communication module is arranged in the control box of elevator, process communication data.The FPDP of communication module is connected with the PORT COM of frequency converter and video data terminal with PLC in control box, can by the internal data of instruction fetch to PLC and frequency converter, wherein contain running state information and failure message, communication module is with GPRS communication interface in addition, the data collected can be sent on monitor supervision platform server.Video data terminal is arranged in car, is lcd touch panel type display, and can receive communication by RS485 bus and receive data and show, display frame comprises the picture that normally works, alarm screen and data query interface.Monitor supervision platform server is positioned at the machine room of user, is connected to internet and has static ip address and proprietary domain name.User terminal is the mobile terminal such as computer or mobile phone being connected to internet, can be connected to monitor supervision platform server, the various data of the elevator that access services device records by internet.
Principle of Communication:
The mode that communication network adopts ripe RS485 communication network and wireless GPRS network to combine.The data-interface of PLC and frequency converter and video data terminal is RS485 network interface, defers to ModbusRTU agreement.Include a data exchange unit in communication module inside, be responsible for the data exchange of RS485 network and wireless GPRS network.Communication module inside includes a GPRS communication module group, is linked in mobile communications network after energising, and this network is connected with internet by the gateway of commmunication company, so just establishes a data link.Communication module is sent on the monitor supervision platform server of assigned ip by gathering the field data come by this link, and such server just obtains the operating data of on-the-spot elevator.
Data are formed:
Communication data comprises three classes: fault, operation and maintenance.Reference record when fault data comprises fault type, downtime, fault.Operating data comprises the information such as position, speed, call, voltage, electric current.Service data comprises fault statistics, operating data statistics, service action log etc.
Refer to Fig. 3, GPRS communication module adopts transparent data transfer and protocol conversion, support dummy data private, support dynamic data center domain name and IP address, data transmission supports single channel single centre or multi-channel multicenter (selecting the product of corresponding software version), inside comprises communication module group and controller, and controller plays a bridge effect.The capable signal data of communication port acceptable string of GPRS communication module and instruction, its communication module group realizes data by the terminal on GPRS network and Internet and exchanges visits.
In the electrical schematic diagram of Fig. 4, main element model is: PLC:CP1E-N40CDR+CP1W-CIF11, frequency converter: CIMR-HB4A0031FAA, GPRS communication module: H7710.Motor: ABB 11kW three-phase 380V, video data terminal: Omron NB7W.Need the wire linked together to represent by identical wire size in figure, below describe in also represent by wire size any wire having this wire size linked together.Input three-phase 380V/50Hz power supply U1, V1, W1 connecting breaker QF1 input end, mouth U2, V2, W2 of QF1 are connected respectively to the main circuit power input end (R, S, T) of frequency converter VS and the input end of circuit breaker Q F2.The contact 2,4,6 that the contact 2,4,6 that the major loop mouth (U, V, W) of frequency converter is connected respectively to the contact 1,3,5, KM1 of contactless switch KM1 is connected respectively to the open contact 1,3,5, KM2 of contactless switch KM2 connects the input of motor.B1, B2 end of frequency converter connects braking resistor RB.A+, B-end of frequency converter is connected respectively to A+ and the B-end of PLC and GPRS communication module CM1.Be connected with the COM3 of PLC outgoing side after the open contact of the control end SC series connection KM4 of frequency converter; 100.07 of Frequency Converter Control end S7 and PLC connects; 100.06 of Frequency Converter Control end S6 and PLC connects; Be connected with 100.05 of PLC after the normally closed contact of Frequency Converter Control end S2 series connection KA1, be connected with 100.04 of PLC after the normally closed contact of Frequency Converter Control end S1 series connection KA2; The mouth MA of frequency converter is connected with 0.01 of PLC input side; 0.02 connection of mouth M2 and the PLC of frequency converter.The three-phase of QF2 exports U5, V5, W5 and is connected with the input of phase sequence protective relay JXW, and in addition, U5 with the W5 signal that QF2 exports also inputs with the 380V of voltage transformer TC and is connected.The secondary of voltage transformer TC has 3 tunnels to export, the first via exports as 220VAC, live wire 021 is wherein connected with FU1 input end, is connected (022), also connects the ac input end of QL1 simultaneously after the open contact of the mouth series connection KM2 of FU1 with coil one end of KA3; The zero line side 020 that the TC first via exports connect KM1 open contact after is connected (023) with the other end of KA3 coil, simultaneously and be connected with another ac input end of QL1.The DC output end 024 and 025 of QL1 connect respectively 2 groups of KM3 open contact after be connected magnet stopper YB on motor.The live wire 041 of the second tunnel output 26VAC of voltage transformer TC is connected with circuit breaker FU2 input end, and the mouth of FU2 is connected with one of them input end of QL2; Zero line 040 is connected with the another one input end of QL2.The mouth of QL2 is vdc, just very L2+, and negative pole is M2, and voltage is about 24V.3rd tunnel of voltage transformer TC exports as 220VAC; its live wire 061 connects the input end of circuit breaker FU3; the mouth 062 of FU3 and zero line 060 connect the input end of master cock QF3; the fire wire output end 101 of QF3 connects open contact 15 pin of phase sequence protective relay JXW; open contact 18 payment to a porter number is the zero line mouth wire size of 102, QF3 is 100.The coil two ends of KM1 and KM2 are connected on wire 100 and 102 respectively.Wire 100 connect KM2 open contact after wire size be 120, be linked into the power input L2/N of PLC, wire 102 connect KM1 open contact after wire size be 110, be linked into the power input L1 of PLC.Wire 110 is connected the coil one end of contact relay KA2 after upper limit position switch SQ7, and wire 110 is connected the coil one end of contact relay KA1 after upper limit position switch SQ8, and the other end of KA1 and KA2 coil is connected on wire 100.Coil one end of contactless switch KM4 is connected on wire 100, and the other end 121 is connected on wire 110 after being connected in series the open contact of 1 ~ 4 layer of door switch SQ1 ~ SQ4, car door switch S Q5, car skylight switch SQ6, emergency stop switch QS1, QS2 and KA3.The 24V direct current output plus terminal L1+ of PLC connects the input end of FU4, and the mouth of FU4 is received on wire 350.It is M1 that the 24V direct current of PLC exports negative terminal.M1 and the MC signal of frequency converter is connected on wire 350.The input end COM0 of PLC meets M1, and input end 0.06 and 350 connects the open contact of KM4 respectively; Input 0.07 and 350 connects MA and the MC signal of frequency converter VS respectively; Input 0.08 and 350 connects M2 and the M1 signal of frequency converter VS respectively.The output terminals A of coder, B connect the input end 0.00 and 0.01 of PLC respectively.The input end 0.09 of the one termination PLC of magnet-sensitive switch MCS1, another termination 350.The open contact of relay K A1 is connected between PLC input end 0.11 and 350; The open contact of relay K A2 is connected between PLC input end 0.10 and 350.The open contact of inspection switch SA6 is connected between the input end 1.00 and 350 of PLC, and what connect the wire of PLC input end 1.00 is numbered 320.Select one end of layer button SB1 ~ SB4 to receive on the input end 1.01 ~ 1.04 of PLC respectively, the other end is all connected on 350.One end of hall buttons SD1 ~ SD4 is connected on the input end 1.05 ~ 1.08 of PLC respectively, and the other end is all connected on 350.The end falling terraced button SB8 is connected on the input end 1.09 of PLC, and the other end is connected on 350.In step, one end of button SB5 and the lower button SB6 of step is connected on the input end 1.10 and 1.11 of PLC respectively, and the other end is all connected on 320.The COM0 of PLC mouth is connected with 121, and the wire number of the mouth 100.00 of PLC is 400, is connected to the coil input end of contactless switch KM3, and another input end of KM3 coil is 100.GPRS module CM1 power supply input+,-end meet 350 and M1 respectively, signal input part A+ and B-is connected on 501 and 502 respectively, and the signal 505 of antenna output end is connected with external antenna.Video data terminal DP1 power supply input+,-end meet 350 and M1 respectively, signal input part A+ and B-receives on 501 and 502 respectively.Photoelectric encoder EC1 the east of a river village input+,-end meet 350 and M1 respectively, signal output part 304 and 305 is connected in the input 0.00 and 0.01 of PLC respectively.
020/021 of voltage transformer TC exports winding to be motor magnet stopper provides power supply, and 060/061 winding provides power supply for PLC and contactless switch, and 040/041 winding provides power supply for low-voltage control circuit.The open contact of KM1 and KM2 is in series with between the output and motor of frequency converter.After only having KM1 and KM2 action simultaneously, the output of frequency converter could drive motor.And the action of KM1 and KM2 can represent that control circuit is powered normally.The object simultaneously using KM1 and KM2 is to improve reliability and safety.Even if there is an element failure in KM1 and KM2, also can not there is misoperation in controller, produces dangerous.Phase sequence protective relay JXW only when input end phase sequence correctly and not phase shortage, output relay just can action, connects and controls electric power loop.The incoming signal of PLC comprises: 1. fault and status signal 300,301,302; 2. code device signal 304,305; 3. magnet-sensitive switch signal 309; 4. limit switch signal KA1, KA2; 5. overhaul signal 320,340,341,342; 6. select layer and calling signal: SB1 ~ SB4, SD1 ~ SD4.The output signal of PLC comprises: 1. band-type brake control signal 400; 2. call display: 421 ~ 424; 3. electroclock 420; 4. running state display: 401 ~ 406; 5. inverter control signal 411 ~ 415; 6. communication signal 501 and 502.
Specific works process:
After QF1, QF2, QF3 and FU1, FU2, FU3, FU4 close a floodgate successively, whole controller obtains electric, enters normal working.
In normal course of operation, PLC first determines current position according to the count value of coder and the calibration value of each stop, exports layer position, current place indicator signal 401 or 404.When having calling signal or layer selection signal; call lamp bright 421 or 424; PLC determines the count value of service direction and target location; if now door interlock protection loop is normal; be communicated with between 121 and 110, and frequency converter is normal, M1, M2 are closed and MA, MC are closed; PLC exports upward signal 411 or downgoing signal 412, also exports up or descending indicator lamp signal 405 or 406.Because door interlock protection circuit is communicated with, KM4 action, 410 and 415 connect, and the COM3 that PLC exports has connected Frequency Converter Control end SC.Be in normal traffic coverage assuming that current, KA1 and KA2 is not operating, and 411 and 416 connect, and 412 and 417 connect, SC signal 410 before adding, frequency converter input instruction signal is effective, and 400 signals are effective simultaneously, KM3 action, electromotor brake is opened, and motor runs under the driving of frequency converter.Coder output pulse signal counts to PLC, PLC internal counter, and judges current location according to precalibrated position data.After arriving the level position of target stop, PLC exports 100.00 Signal Fail, KM3 power-off, electromotor brake resets, and the signal 411 ~ 415 that PLC exports to frequency converter all lost efficacy, it is locked that electric machine main shaft is braked device, car stops, and 420 signals export effectively, continue 0.5 second, this signal drives electroclock, sends the prompt tone that arrives at a station.It is more than complete course of action during normal running.
If there is exception, limit switch KA1 or KA2 action, then can cut off corresponding control signal 417 or 416, frequency converter is out of service immediately after losing above operation control signal, thus realizes out-of-limit defencive function.If the chain safety return circuit of emerged in operation door is abnormal, namely 121 and 110 separated, also can cause KM4 power-off, after KM4 ct-off signal is detected by PLC, then control frequency converter by PLC and stop immediately exporting.
When needs overhaul, connected by switch S A6, the output signal 100.07 of PLC is effective, and setting frequency converter, with the low cruise of 10Hz, is signal 414.Button switch SB5 and SB6 is step-by-step operation button.When pressing, PLC provides upward signal 411 or downgoing signal 412, and frequency converter runs with a flowing mode drive motor.
Frequency converter in controller, PLC, video data terminal and GPRS communication module exchange data by RS485 interface.Running state and the faulty condition of PLC and frequency converter are all sent in GPRS communication module, then send to video data terminal by GPRS communication module by RS485 bus; In addition, above data are also sent in GPRS network by GPRS communication module, receive for long range data platform.
Refer to Fig. 5, photoelectric encoder erection plan, can find out, photoelectric encoder is arranged between motor 11 and reductor 14, when electric machine main shaft 12 rotates, drive the code-disc of photoelectric encoder 13 inside to rotate, coder and exportable with rotating speed and the impulse singla of directional correlation in PLC.
The cabinet outside drawing of Fig. 6, its cabinet all adopts 304 corrosion-resistant steels to make, and be provided with air outlet 9 and ventilation inlet 7 respectively in left side and right side, bottom is provided with discharge port 8, prevents box house ponding.Some master cocies cabinet body door are equipped with, button 5, the lower button 6 of step in emergency stop button switch 2, lighting switch 3, inspection switch 4, step.
Above-mentioned detailed description of this kind of elevator malfunctions long distance control system being carried out with reference to embodiment; illustrative instead of determinate; several embodiments can be listed according to institute's limited range; therefore in the change do not departed under general plotting of the present invention and amendment, should belong within protection scope of the present invention.
Claims (4)
1. an elevator malfunctions long distance control system, it is characterized in that: form failure message primarily of PLC, frequency converter, GPRS communication module, video data terminal and remote platform server and receive communication network, described PLC, frequency converter are connected with GPRS communication module respectively by RS485 port with video data terminal, described GPRS communication module and remote platform server exchange data by wireless GPRS mode, exchange the status information of PLC and frequency converter and the data of failure message between video data terminal and remote platform server.
2. elevator malfunctions long distance control system according to claim 1, it is characterized in that: described remote platform server has fixing IP or internet domain name, IP and domain-name information are pre-configured in GPRS communication module, adopt between described GPRS communication module and remote platform server udp protocol exchange data, data comprise the identification of convenient service device end software device id, data time stamp and frame number information.
3. elevator malfunctions long distance control system according to claim 1, is characterized in that: described data exchange adopts MODBUS agreement in data link layer, possesses CRC16 verification.
4. elevator malfunctions long distance control system according to claim 1, it is characterized in that: described GPRS communication module has three RS485 serial data channels that are independent and isolation, it is connected with PLC, frequency converter, read-out respectively, and each passage possesses independently communications parameter.
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| CN201410613444.2A CN104355196A (en) | 2014-11-04 | 2014-11-04 | Remote monitoring system for elevator failures |
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| CN104787634A (en) * | 2015-03-28 | 2015-07-22 | 上海新时达电气股份有限公司 | Monitoring method of elevator all-in-one machine, elevator all-in-one machine and monitoring system thereof |
| CN105022334A (en) * | 2015-06-24 | 2015-11-04 | 南通理工学院 | Electrical monitoring device for lifter |
| CN105759697A (en) * | 2016-04-29 | 2016-07-13 | 沈阳仪表科学研究院有限公司 | Informatization monitoring management system for elevator |
| CN106373351A (en) * | 2015-07-22 | 2017-02-01 | 株式会社日立大厦系统 | Elevator maintenance system |
| JP2018100176A (en) * | 2016-12-21 | 2018-06-28 | 株式会社日立ビルシステム | Failure handling support server and failure handling support method |
| CN108217375A (en) * | 2016-12-22 | 2018-06-29 | 天津超音科技有限公司 | Elevator safety monitoring system based on PLC |
| CN108408510A (en) * | 2018-05-09 | 2018-08-17 | 广西建工集团建筑机械制造有限责任公司 | A kind of building hoist automatic driving control system and control method |
| CN108466885A (en) * | 2017-02-23 | 2018-08-31 | 无锡鸿廷科技有限公司 | A kind of elevator long distance control analysis and management system |
| WO2018223315A1 (en) * | 2017-06-07 | 2018-12-13 | Abb Technology Oy | Controlling of frequency converter |
| CN109409545A (en) * | 2018-11-07 | 2019-03-01 | 深圳市新科瑞电气技术有限公司 | Plant maintenance method, equipment to be checked, maintenance terminal and service centre |
| CN113891847A (en) * | 2019-05-29 | 2022-01-04 | 因温特奥股份公司 | Elevator system with multi-purpose edge gateway and method for data communication |
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