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Elevator door interlock short circuit protection

Mar 05, 2019

1. Two typical hall door elevator door interlock circuits

Elevator door interlock circuit 1: The hall car door is connected in series, and only one point is input to the PLC or the circuit board.

Elevator door interlock circuit 2: Hall door car door independent, hall door circuit relay, relay auxiliary point input circuit board, car door directly input circuit board.

 

Second, the elevator door interlocking inspection rules:

“Elevator periodic inspection report 6.10 layer, car door electromechanical interlock protection: a. normal operation landing door can not be opened; b. layer, car door can not operate when the car door is open; c. there is an electrical device to check the closed position.

Both the elevator door interlock circuit 1 and the Schindler elevator door interlock circuit 2 can meet the inspection requirements.

However, the title of the title "Layer and car door electromechanical interlock protection" is changed to "layer, car door electromechanical "disconnect" protection".

 

Third, the elevator door interlock failure analysis:

The analysis of the accident at the entrance and exit of the elevator and the detailed fault tree analysis are as follows:

X1: Door lock switch of elevator door interlock is shorted X2: Short circuit lock circuit X3: Door lock micro switch contact does not open

X4: Elevator door interlock door lock relay contact is delayed or not disconnected

X5: Press the emergency button to operate the elevator (the emergency button is now canceled, so there is no need to discuss it)

The control cabinet takes protective measures against X1~X4.

 

Fourth, the control cabinet for the protection of X1 ~ X4:

The elevator door interlock circuit 1 cannot be protected because the hall door is not separately monitored.

The elevator door interlock circuit 2 is OK, and it is available in both hardware and software, such as fault 35, fault 86 87, and will not be described in detail.

In terms of PLC control, GVF's PLC program is quite excellent, and important relays and contactors monitor their auxiliary contacts, not to mention the hall loop relays.

 

V. Other:

1. The elevator door interlock circuit 1 is powered by DC 125V, and the elevator door mechanism is quite reliable. In actual use, there is very little need to short-circuit the hall door. This is the elevator only uses the single-point monitoring hall car door. The reason for the loop.

However, the mechanical structure of some small factories in China is not excellent, and the control cabinet uses circuit 1, even because PLC points or more unexpected, important relays and contactors do not monitor their auxiliary contacts, it is inevitable to short-circuit the hall door circuit.

Therefore, the elevator has a very bad head in this respect, which has played a very bad role.

It is no wonder that SIGMA's current hall structure is also in elevator style.

2. Elevator door interlock circuit 2 is mostly powered by DC 48V. When there are more than 20 layers, if there is too much dust, it is easy to malfunction.


This article tags: elevator door interlock short circuit protection