Device for testing function of contactors and apparatus for performing elevator function

An elevator functionality device comprising:

• a control unit;
• a contactor configured to short three-phase phase lines of an elevator motor together by closing contacts;
• a motor drive circuit coupled to an elevator motor and configured to power the elevator motor;
• a function detection device comprising:
• a voltage signal source coupled with the contactor, the voltage signal source supplying voltage separate from voltage supplied by the motor drive circuit;
• a voltage detection unit coupled with the three-phase phase lines of the elevator motor, the voltage detection unit being configured to measure voltage of the three-phase phase lines and to output measurement to the control unit;
• a switching unit arranged between the contactor and the voltage signal source and between the voltage detection unit and the three-phase phase lines,
• wherein, the control unit is configured to perform the following operations in a 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 via the contactor and to conduct the voltage detection unit to the three-phase phase lines, and determining whether a function of the contactor is normal based on the measurement.