【 Weak current College 】 how quickly confirm elevator failure

Elevator maintenance personnel on the job often encounter a variety of phenomena, if careful investigation and analysis, be good at summing up, will provide a lot of work later.

1 rotary encoder fault acknowledgement

Example 1: a GPS-|| lift, flat layer of inaccurate running trip "Teng yiteng" phenomenon in maintenance a lot of trouble to go many detours ultimately found to be due to rotating code: several photoelectric sensing 9 holes were dust sealing due to fault elimination after cleaning.

Example 2: a P90-50 lift in empty cabin safety clamp a Governor linkage experiment after anomalies, Elevator selected layer starting after crawling about 50mm, stop wondering. Since the lift-with the operating conditions, and no obvious other anomalies so sure is rotary encoder problems. finally find out why it really was the rotary encoder and a PC connection has virtual received phenomenon.

Instance, 3 1 VVVF lift running frequently stopped escalator. and then auto-leveling rear can be up and running. gun the fault is not bad because it brake lines. Nor is it a security loop and lock loop instant-off. But because rotary encoder badly worn cause lift running in signal suddenly phenomenon induced.

Example 4: 1 GPS-CR elevator maintenance run normal express runtime cabin strongly oscillating, Elevator regularly nodded particularly multi-storey runtime this phenomenon is particularly evident in check lift main circuit printing plates and driving unit still does not find a real reason-enquiry owners know that someone in the engine room cleared of debris, the elevator started appearing after the above phenomenon. on traction and control cabinet to examine the external stresses discovered in the tail for speed motor feedback of PG grounding copper Peel distortion makes the elevator in the operation of the motor shaft and shaft sleeve different Pc's heart after processing 1 slice connection copper sheet, the replaced the symptom elimination.

By rotary encoder failure in reality not a few check up is quite laborious sometimes have to troubleshoot but still can't make people at ease. therefore to share a simple confirmation rotating code failures from driving control system diagram it is clear now is because the computer only allows rotating code a converter between a motor. Form a closed-loop speed control systems-solid this if there is a problem with encoder feedback signal will not normally affect the motor running. If at this point we simply rotary encoder feedback broken-into open-loop control, the motor if you also have the ability to now normal fast running so you can fix the fault does produce elevators in rotary encoder on otherwise should go in the other side leaning on fault this is to confirm the rotary encoder fault of theory and methods.
Of course, for security reasons when you disconnect the feedback is running, lift up and down should not be to the two end stations.

2 door lock failure location of quick confirmation

Door interlock failure fault in the elevator in the reasonably high proportion. For door interlock failure, we easily in the engine room control cabinets, control by viewing the show or fault code confirmation. If the elevator floor less, we find one by one, to exclude nor trouble individually, but if you are experiencing, such as high-rise building 5 layer of high, how to quickly and accurately find door interlock failure's layer station, because the door interlock failure so that the lift cannot run-time, first in the engine room control cabinet wiring rafts identified car door switch terminals and Hall door switch terminal. In the car door and the door close all Office, respectively measuring car door switch and door switch is connected to the Office. If the measurement results for car door switch is switched on, and the hall door switch is off, you can use the following grouping method for continuing to judgment.

The door lock loop on line no. 01 and 11 so that shorted the lift can be up and operational. Maintenance personnel to enter the car top, in the car top wiring box find 01 and line 10. Suppose this lift is 40-40 station, by car top slow button to middle-tier stand as the first 20 stations, open 10-station car door, Hall door, all the rest of the hall door closed. With a conductor a received on car top line wiring 01, other side received a multimeter, table a table amount multimeter other table amount received 20-station Hall door door interlock switch contacts. If interlock switch two contacts have a connected using a multimeter, 21-40-station door interlock switch all connected; if we could not get connected multimeter, 21-40-station door interlock switch is open. The same method to determine 1-19 storey station door interlock switch. as regards the 20 storey station you can close the door to door interlock switch after measurement of two contact coherent and broken. And then, and then open the judgment of half of the station take 1/2 layer stands as the measuring points, and so on will be able to quickly find out the door interlock-circuit layers station.

3 door blade touch wipe door wheel failure confirmation

The lift is running in a stopped escalator phenomenon, probably because of the instant on-off lock loop (people-minute steak), or it may be because of the speed limiter tensioning device in instant touch clock on the rope switch, of course, is also possible that the elevator is running in the door blade touch wipe door wheel. If you opened a professional repair books, you will see at least may cause can occur suddenly stopped escalator phenomenon. So, how do you confirm that the door blade touch wipe door wheel failure?

For using the PLC control of the lift, you can program OUT (M21) and OUT (M111), inserted as shown in Figure 2, where the program is run relays, M21 X14 is lock relay contacts. After the failure, check the counter C224 of PLC K value and the value of the last check of K compared, if you find that increased 1 time, so you can be sure the elevator exists door wipe door wheel cutters.