Troubleshooting ideas and methods of the hottest e

Ideas and methods for troubleshooting elevator

elevator is mainly composed of machinery, drag circuit and electrical control parts. The drive system can also belong to the electrical system, so the failure of the elevator can be divided into mechanical failure and electrical failure, which was emphasized by the senior manager of the company at the meeting. When encountering a fault, you should first determine which system the fault belongs to, whether it is a mechanical system or an electrical system, then determine which part of which system the fault belongs to, and then determine which component or contact of which action component the fault comes from

how to judge which system the fault comes from? The commonly used method is: first set the elevator in the "maintenance" working state, and jog the elevator at the car leveling position (in the machine room, car roof or car operation) to slow up or slow down. To ensure safety, first of all, confirm that all hall doors must be closed and cannot be opened again during maintenance and operation! Because the elevator goes up or down in the maintenance state, the electrical control circuit is the simplest inching circuit. How long the button is pressed, how long the elevator runs, and how long the elevator will not act without pressing the button. The distance it needs to run can be controlled at will, and the speed is very slow. The car running speed is less than 0.63m/s, so it is safe and convenient for the maintenance personnel to operate and find the fault location. This is an elevator function specially set for the maintenance personnel. There is no other intermediate control link in the electric circuit, which directly controls the elevator drive system. During the maintenance and operation of the elevator, the maintenance personnel can carefully observe whether there is abnormal sound, abnormal smell, and whether some indication signals are normal. As long as the inching operation of the elevator is normal, it can be confirmed that the main mechanical system is OK, the main drive circuit in the electrical system is OK, and the fault comes from the control circuit of the electrical system. On the contrary, if the elevator cannot be jogged, the fault will come from the mechanical system or the main driving circuit of the elevator

I. main drive system fault and its causes

point 2. During the correct installation and operation of the tensile testing machine, if you confirm that the main drive circuit is faulty, that is, the main circuit is faulty, you can analyze the location of the fault from each link constituting the main circuit. The AC/DC power supply circuit of any motor, including the control circuit of various functions, must form a closed circuit for the flow of AC or DC current. If the current is blocked or shunted at any part of the circuit, it can cause a fault. The part where the current is blocked is the part where the fault is located. Of course, first confirm that the power supply itself is normal, otherwise there is no current or the current size is inappropriate, This is also one of the parts prone to failure in different periods. Most of the electromechanical devices used to form the main circuit of any elevator are: the basic links of stepping electromechanical devices and exchange servo electromechanical devices are roughly the same: starting from the three-phase power supply, through the air switch, up or down 175 steel pipe scaffold fastener line AC contactor, governor, running contactor, thermal relay, and finally to the three-phase winding of the motor to form a three-phase AC current circuit. For different types of elevators, the speed regulation methods are different, and the types of speed regulators are also different, which are nothing more than frequency conversion speed regulation, AC voltage regulation speed regulation, DC voltage regulation speed regulation or soft starter. Of course, the supporting motors are also different. Main circuit fault is also a common and important fault of elevator

because the main drive system operates continuously, the contactor contacts often have oxidation, contact spring fatigue, poor contact, contact falling off, inverter module and thyristor thermal breakdown or burnout, motor bearing wear and other faults after several years of elevator operation. This is one of the ideas to quickly find faults, because any mechanical action parts have a certain life, such as relays, contactors, microswitches, travel switches, buttons and other components, as well as frequently operating parts, such as the traveling cable of the lift car, which often bends, there is the possibility of wire breakage