Kone Elevator Cop Lop With Lock Key Switch Push Button Panel

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The elevator hall call is invalid, the internal call is valid, what is the reason?

The internal call and the external call have nothing to do with the external call. The line of the external call is walked down from the hoistway slot, while the internal call is transmitted to the car top by the accompanying cable and then assigned to the car. If it is only on one floor, it depends on that. Check if the button is broken, and if there is any problem with the line from the button to the hoistway, if all floors are invalid, then go to the control cabinet to check, and measure whether the control cabinet has voltage for the hoistway communication.