What are the Three Common Faults of Otis Elevators Parts?

In Elevator maintenance, besides systematic learning in training, the tips and techniques summarized in practice are equally important. There's a saying, "The less you see, the more strange it becomes." The more we see, the less panicked we become when encountering problems, and the more adept we are at handling them. This is our purpose in writing this article as a supplier of Otis elevator parts—to broaden everyone's knowledge and help them become elevator experts.

Fault 1: 
User 3100 reported that the Otis elevator motor stopped functioning and would not run, the external Otis elevator push buttons were not operational, the floor display was normal, and the door would not open. 
Using the Otis test tool TT to check the TCB fault records 0100, 0105, and OVF20 fault record CHKDBDSIG, checking relays SW1 and SW2, it was found that the auxiliary contact of relay SW1 had poor contact. After the replacement, it worked normally.

Fault 2: 
User T60 complained that the door repeatedly opened and closed at the leveling position, requiring several door openings before it could run, but it was normal most of the time. 
Checking the Otis elevator board, MIB board, and inverter revealed no fault records. Observing in the machine room and waiting for the fault to reappear. It was discovered that when the fault occurred, relays U and D would immediately disconnect after activating. A multimeter was used to check the voltage at terminal A1 of relays U and D; no voltage was found during the fault. Considering the absence of a fault log, the fault was suspected to be behind the safety detection point. The car door and hall door contacts were checked one by one and found to be normal, but the fault could not be found immediately. Further observation revealed that relays U and D would disconnect after relay LB was activated. Checking the schematics, relay LB had virtually no effect on relays U and D. 
Manually controlling relay LB by holding it in place resolved the issue. Suspecting a fault in the LB relay contacts, the main relay contacts in the control cabinet were inspected. It was found that the  Otis elevator parts contact resistance of contacts 13-14 of the SDP relay was 50-200 ohms. Cleaning the contacts significantly reduced the frequency of the fault. Replacing SDP relay 13-14 resolved the problem.

Fault 3: 
A user of T2000VF complained that the elevator was trapping people. 
After the person was released, the elevator was put into maintenance in the machine room, but it did not move. TT checked the MC fault record 2703 and the DB fault record DCURRENTFDBK. The UDX relay contacts were found to be normal. The Otis elevator motor output terminals of the control cabinet were checked, and it was found that the W phase terminal was burnt. After replacing the terminal, the elevator functioned normally.

As a professional supplier, our company offers a wide range of Otis elevator parts and accessories, and we also provide technical guidance. If you have any needs in this area, please feel free to contact us: candice@nonaelevator.com or +86 17719527681.