【 Weak current College 】 elevator electrical failure lookup method

When the elevator control circuit failure, the first question to ask, see, hear, smell, be aware of. The so-called asked, is asking the actor or report the failure of failure occurs, the query failure before doing any adjustment or replacement components; the so-called, is the observation of each part is working properly, take control of various signal indicates that the elevator is correct, see electrical components appearance color is changed. "Listen, listen circuit work when abnormal sound; sounds that smell that smell circuit elements whether there are abnormal odour. Upon completion of the work, you can use the following methods to find electrical control circuit failure.

1, the program checks the method

Elevator is a program to run every time you run all through the selected layer, directional, closed, start, run, change speed, leveling, opening the door of the cycle, where each step is called a working link for each work session, there is a corresponding control circuit. Program inspection method is to confirm that the failure of specific control links appearing on which, in the direction of the troubleshooting change clear, targeted is very important for troubleshooting. This method applies not only to have contact with electrical control devices, also applies to the contactless control system, such as the PC control system or microprocessor control system.

2. static resistance measurement method

Static resistance method variable is in power, multimeter resistance measurement circuit resistance stalls are normal, because any one of the electronic components are a PN structure, its forward and backward resistance values are different, no electrical components also have a certain resistance, connected to the electrical components of the line or switch, resistor value not equal to zero is infinity, measuring their resistance value size compliance requirements can judge. Check an electronic circuits are available with and without fault, but this method is more secure.

3. potential measurement method

The above method failed parts cannot be determined, in each case measuring power electronic or electrical components devices at both ends of the potential, because under normal working conditions, current-loop circuit points potential is considerable, the so-called points potential refers to various points on the circuit components on the potentials of different, but have a certain size requirements, current flows from the high potential, low-voltage current direction measurement of electronic and electrical components on the potential size should be consistent with the law, through the multimeter measurement control circuit for points of potential compliance values, you can determine where the point of failure, and then determine what caused the current value of the change, is the power supply is not correct, or the circuit-breakers, or component is damaged.
4 short circuit method

Control-link circuit by a switch or a relay, contactor contacts a combination. When you suspect that some contact is at fault, it is possible to use wire to the contact shorted, power to prove fault disappears, the judgement, the electrical components is bad. But remember, as a test after the point of failure should be removed immediately after short wiring, wiring with short is not permitted in place of the switch or contact. Short-circuit method is mainly used to find the electric circuit of breakpoint logical relationships, of course, sometimes the measurement circuit faults can also use this method.

5. circuit breaker method

Control circuit also may be some special failure, such as the elevator does not have internal or external call indicates when it stops, etc. This shows that some contact is in circuit shorted, find such a failure is the best way is the circuit breaker method, it is suspected that the contact points generated fault, if fault breaks away, explains the correct judgment, circuit breaker method is used primarily for "and" logical relationship point of failure.

6. substitution method

In the light of the above methods, found fault for a point or a block circuit board, you can take that component or circuit board removed, use new or confirm no failure of a component or circuit board in place, if the failure is considered to determine the right away. Instead you need to continue to find, often maintenance personnel on the vulnerability of the components or important electronic boards are available in spare parts, once there is a failure immediately put on a piece that solves the problem, faulty parts back then slowly find repair, it is also a quick troubleshooting method.
7. experience of elimination

In order to be able to achieve rapid troubleshooting, in addition to constantly sum up their own practical experiences, to learn the experience of others. Elevator malfunction formation there is a certain law, experience with sweat and lessons of, we should pay more attention to these experience allows us to quickly troubleshoot and reduce accidents and losses. Of course, strictly speaking it should eliminate the elevator accident, this is our application maintenance personnel. Learning with our maintenance and troubleshooting experience, you can increase the lift installation maintenance staff skill levels, improve the quality of service elevator industry and credibility.

8. electrical system troubleshooting basic ideas

Electrical control system sometimes fault is more complex, there are currently in the elevator with many uses computer-controlled, cross-hardware and software together, experiencing trouble first thoughts don't be nervous, troubleshooting difficult ones later, when adhering to the first-in, after consideration, an association.

Elevator in more failure is caused by poor contact switch contact, so judgment fails should be based on the fault and the led display control cabinet, the first external lines, power part inspection, first check the door contact, safety circuits, AC-DC power supplies, etc., as long as you are familiar with the circuit, this allows you to solve very quickly.

Some faults are not as relay line so simple and intuitive, the protection of many PC elevator is implicit in its software, hardware, system, its failures and reason as results and conditions is strictly correspond to find fault in an orderly manner on their relationship with Lenovo and forecast, to exclude questions one by one until the fault completely ruled out.