An elevator functionality device comprising: a control unit; a contactor configured to short three-phase phase lines (U, V, W) of an elevator motor together by closing contacts; a device for detecting a function of a contactor, the device for detecting a function of a contactor comprising: a voltage signal source coupled with the contactor; a voltage detection unit coupled with the three-phase phase lines (U, V, W) of the elevator motor; a switching unit arranged between the contactor and the voltage signal source and between the voltage detection unit and the three-phase phase lines (U, V, W), wherein, in a detection mode, the switching unit is configured to conduct the voltage signal source to the contactor to provide a voltage detection signal to the three-phase phase lines (U, V, W) via the contactor and to conduct the voltage detection unit to the three-phase phase lines (U, V, W), the voltage detection unit being configured to measure voltage of the three-phase phase lines (U, V, W) and to output measurement to the control unit; wherein, the control unit is configured to perform the following operations in the detection mode: instructing the contactor to cause the contacts to close, instructing the switching unit to conduct the voltage signal source to the contactor to provide a voltage detection signal to the three-phase phase lines (U, V, W) via the contactor and to conduct the voltage detection unit to the three-phase phase lines (U, V, W), and determining whether a function of the contactor is normal based on the measurement. a control unit; a contactor configured to short three-phase phase lines (U, V, W) of an elevator motor together by closing contacts; a device for detecting a function of a contactor, the device for detecting a function of a contactor comprising: a voltage signal source coupled with the contactor; a voltage detection unit coupled with the three-phase phase lines (U, V, W) of the elevator motor; a switching unit arranged between the contactor and the voltage signal source and between the voltage detection unit and the three-phase phase lines (U, V, W), wherein, in a detection mode, the switching unit is configured to conduct the voltage signal source to the contactor to provide a voltage detection signal to the three-phase phase lines (U, V, W) via the contactor and to conduct the voltage detection unit to the three-phase phase lines (U, V, W), the voltage detection unit being configured to measure voltage of the three-phase phase lines (U, V, W) and to output measurement to the control unit; wherein, the control unit is configured to perform the following operations in the detection mode: instructing the contactor to cause the contacts to close, instructing the switching unit to conduct the voltage signal source to the contactor to provide a voltage detection signal to the three-phase phase lines (U, V, W) via the contactor and to conduct the voltage detection unit to the three-phase phase lines (U, V, W), and determining whether a function of the contactor is normal based on the measurement. a voltage signal source coupled with the contactor; a voltage detection unit coupled with the three-phase phase lines (U, V, W) of the elevator motor; a switching unit arranged between the contactor and the voltage signal source and between the voltage detection unit and the three-phase phase lines (U, V, W), wherein, in a detection mode, the switching unit is configured to conduct the voltage signal source to the contactor to provide a voltage detection signal to the three-phase phase lines (U, V, W) via the contactor and to conduct the voltage detection unit to the three-phase phase lines (U, V, W), the voltage detection unit being configured to measure voltage of the three-phase phase lines (U, V, W) and to output measurement to the control unit; wherein, the control unit is configured to perform the following operations in the detection mode: instructing the contactor to cause the contacts to close, instructing the switching unit to conduct the voltage signal source to the contactor to provide a voltage detection signal to the three-phase phase lines (U, V, W) via the contactor and to conduct the voltage detection unit to the three-phase phase lines (U, V, W), and determining whether a function of the contactor is normal based on the measurement.