Elevator failure confirmation skills - Solutions - Huaqiang Electronic Network

Mastering elevator repairs requires both experience and a deep understanding of common issues. One of the most challenging problems is identifying faults related to the rotary encoder. These issues can be tricky to diagnose because they often mimic other electrical or mechanical problems. In this article, I’ll share three practical tips that can help you quickly identify and resolve such faults. **1. Diagnosing Rotary Encoder Failures** Example 1: A GPS-‖ elevator was experiencing inaccurate leveling during operation, with a "Teng Yiteng" (jittering) effect. After extensive troubleshooting, we found that several photoelectric holes on the encoder were blocked by dust. Cleaning them resolved the issue. Example 2: An P90-50 elevator would crawl about 50mm after starting and then stop. Despite no visible signs of damage, the root cause was a loose connection between the encoder and the microcomputer. Replacing the faulty wiring fixed the problem. Example 3: A VVVF elevator would suddenly stop, then level itself and resume. It wasn’t due to brake or safety circuit issues, but rather a sudden wear on the encoder, causing signal interruption during operation. Example 4: A GPS-CR elevator had noticeable shaking during high-speed runs, especially when stopping at multiple floors. After checking all major components, we discovered that a copper grounding strip on the motor’s tail had deformed, causing misalignment. Replacing it solved the issue. Rotary encoder problems are common and often frustrating. To simplify diagnosis, you can disconnect the encoder’s feedback signal and switch to open-loop control. If the motor still runs smoothly, the issue is likely with the encoder. Otherwise, check other parts of the system. **Important Safety Note:** Never operate the elevator at the top or bottom floor while the feedback is disconnected, as it may lead to dangerous situations. **2. Quickly Identifying Door Lock Faults** Door interlock failures are one of the most frequent elevator issues. In the control cabinet, you can usually detect these through fault codes or displays. For high-rise buildings, however, it's important to find the exact location efficiently. When the elevator won’t run, check the door switches on the terminal block. If the car door is closed but the hall door isn’t, use a segmentation method to isolate the faulty floor. By shortening certain lines and testing with a multimeter, you can pinpoint the exact location of the open circuit. This method helps you narrow down the problem without having to check every single floor manually. **3. Confirming Doorknife Touching the Door Roller** If an elevator suddenly stops during operation, it might be due to a momentary opening of the door lock circuit, a broken rope switch, or the doorknife touching the door roller. This is a common issue in many elevators. For PLC-controlled systems, you can insert a small program segment between specific outputs. After a fault occurs, check the counter value. If it increases, it indicates that the doorknife has touched the door roller. Elevator technicians face various challenges daily. With careful observation, analysis, and continuous learning, you can develop efficient methods to handle these issues more effectively in the future. --- Let me know if you'd like this formatted for a blog or technical guide!

Stainless Steel Radiator

Radiators in this case are manufactured with Stainless steel (SS304, SS316 and SS316L).
These radiators are manufactured with both 1mm CRCA sheet and 1.2 mm CRCA sheet as required and centre distance varying from 600 mm to 4000 mm. Stainless steel radiators can be offered with and without paint.
Through the method, the stainless steel plate type radiator for the transformer is simple in structure, free of complex treatment process on the surface of the radiator, not prone to oxidizing and corroding, long in service life, and high in welding strength.

Stainless Steel Radiator,Stainless Steel Transformer Radiator,Stainless Steel Cooling Radiator,Stainless Steel Weather Proof Radiator

Shenyang Tiantong Electricity Co., Ltd. , https://www.ttradiator.com