Lift rotary encoder failure resulting in the phenomenon of lift off layer overhaul！

Lift rotary encoder failure resulting in the phenomenon of lift off layer overhaul

          

Symptom: Recently a sudden lift off layer random phenomenon occurs frequently, resulting guests ride on the elevator suddenly fall one row frightened afraid.

Troubleshooting judgment:

First, use the Services tool ST (SERVICE TOOL): The ST is inserted into the fault ladder LCBII board connection interface standard RS422 serial interface, ST generalist self-test, press the M-1-2-1 into the event function (Event, mainly service elevator maintenance work, you can view the work of the elevator event fault code) display: 0100 opmode nav 0201 correct.run 0231 lsvf-w: / dr three groups of fault protection event in the 0100 car, 0201 Elevator calibration run, the inverter 0231 drive failure. 0100 and 0201 failed to continue running the elevator and then there will be this set of codes, so the analysis of the problem should start with 0231 drive fault.

Second, the fault with the service tool ST ladder insert serial interface converter board, after the self-test press ST M-1-2, shows the event codes more, according to LCBII fault code and drive plate, whereas the drive inverter displays related events there are two codes: DRV: encoder Dir DRV: overload, encoder elevator rotary encoder related faults more frequently. Rotary encoder sensor is mainly elevator drive elevator, it has to go wrong, the fault event will be followed by speed-related unfolded.

Third, according to the fault on behalf of the preliminary judge for the rotary encoder has a certain degree of damage is confirmed that it is caused by an elevator off the floor, it will swap two elevators rotary encoders, running for some time, with the failure of the elevator and swap swap encoder , thus confirming the encoder failure, after the purchase of the new encoder is mounted to the elevator back to normal.

Experience: random failure instruments to observe the code judgment about the direction, according to the general direction to find the features and functions played by the principle of preliminary determination method of comparison with interchangeable final confirmation of failure.

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