Weak current College】 【Mitsubishi common failures and resource collection (1) --- Power By】 【China power house network.

<br> <br> <br> Mitsubishi trouble shooting ideas and methods <br>? <br> Elevator mainly by the machinery, the drag loop, electric control parts. Drag the system can also belong to the electrical system and, therefore, .the fault of elevator can be divided into mechanical faults and electrical failure. When first encountered failure should determine which belong to which system is a mechanical system or electrical system, and then determine whether the failure is what what part of the system, and then determine .which component failure grows or which actions on the part of the contact. <br> <br> How to judge the fault from which system a commonly used method of buildings is: first reset the elevator to the "maintenance" work status, acbin location .(in the room, car top or car) to move the elevator or slow down slower. To ensure security, we must first verify that all the Office door must be closed and no further maintenance operation because the elevator open! overhaul State uplink or downlink ., electrical control circuit is easiest to move the circuit, the button is pressed and how long, how long the lift operation, do not press the button on the elevator does not need to run the action, the number of distances free control, the speed .is very slow, car speed is less than 0.63m / s, more secure, easy to maintenance personnel actions and find fault with this site, which is designed for maintenance personnel Setup function of the elevator. Electric circuit no other intermediate control link, which .directly control the lift drag system, Elevator maintenance and repair personnel during operation can be subtle observation has no abnormal sound, abnormal odour, some indication signal correctly. Lift to move the operation as long as normal, they can confirm: the main mechanical system, .electrical system's main drag circuit, fault from the control circuit of the electrical system. On the other hand not to move the elevator, fault from the elevator of the mechanical system or main drag circuit. <br>? <br> First, the main .drag system failure and cause <br>? <br> To move the operation if you confirm that the primary drag circuit failure, the main circuit failure, you can constitute the main loop of the various links to analysis of failures. Any one of AC .and DC power circuit of motor, including various features of the control circuits, must constitute an AC or DC currents flow in a closed circuit, the current in the circuit of any part is interrupted or shunt, can result in failure, the current interruption of .the site is, of course, the site of fault should first confirm that the normal power supply power supply itself, otherwise no current or current size does not fit, it is prone to failure at different stages of the site. Constitute any lift main loop .similar to the basic links: three-phase power supply from the power supply off the air switch, uplink or downlink AC contactor, Governor, run the contactor, thermal relay, finally to motor three-phase winding constitute three-phase alternating current circuits. .On the different types of lift speed adjustment method, the Governor of the type are also different, is nothing more than AC voltage frequency, speed, DC voltage speed control or soft starter motor, of course, necessary. Main circuit faults elevator malfunction and and .important failure. <br> <br> Because the main drag system is often intermittent discrete movements and thus lift running several years later, the contactor contacts often oxidation, contact spring fatigue, poor contact, contact shedding, inverter module and SCR thermal breakdown or .blowing, motor bearing grinding bad, etc. This is a quick way to find fault, because any mechanical movement parts are there is a certain life, such as relays, contactors, micro switch, limit switch, button, and other components, there are .often run by parts such as car accompanying cables, often bending movement, there is a broken line failure. <br>?  <br> Second, the mechanical system failure and formation of basic reasons <br>? <br> 1, connection .failure caused by loose <br> Elevator in the long run, due to the shock, etc. reasons fastener loosening or loose, making mechanical displacement, loss occurs or lost original precision, resulting in abrasion, chipped elevator parts and cause a fault.  .<br> 2, natural wear and tear caused by the fault <br> Mechanical parts in operation process, inevitably produces wear, wear to a certain extent new parts must be replaced, so the elevator must be running after a certain period, ahead of .a major overhaul to replace some wearing parts, can not wait failed and then update that will cause accidents or unnecessary economic losses. Usual daily maintenance as long as the timely adjustment, maintenance, lift to run properly. If you cannot identify the sliding, scrolling .moving parts wear and adjusted will accelerate the mechanical wear, causing mechanical wear scrap, caused the accident or breakdown. If the rope wear to a certain level must be replaced in a timely manner, this will cause significant accident, various running bearings are easy to .wear parts must be replaced periodically.  <br> 3. lubrication system caused by faults <br> Lubrication is used to reduce friction and reduce wear and extend the mechanical life, but also to cooling, rust-proof, shock absorption, buffering, .and so on. If oil is too small, poor quality, variety, or not, will result in improper lubrication of machinery part of overheating, burn, or damaged. <br> 4. mechanical fatigue caused by the fault <br> Some mechanical .parts constantly for a long time been bending, shear and other stress, produces mechanical fatigue phenomena, plastic reduces mechanical strength. Some parts of force more than strength limit, resulting in rupture, causing the accident or breakdown of machinery. If the rope has been .a long time, and subject to tensile bending stress and wear, more serious mechanical heterogeneity, a unit of the rope may be affected by the force is too large to begin with rope, adding the remaining shares of stress, causing a chain reaction that last .all rope, major accidents that may occur. From the above analysis shows that, as long as their daily job maintenance, periodic lubrication for parts and check for fasteners, mechanical work clearance adjustment, you can significantly reduce the mechanical systems. <br> < .br> <br>.