What does Toshiba elevator vdlck mean?

According to the inquiry of elevator recruitment network, the charging voltage of Toshiba elevator (VDLCK) is insufficient, indicating that the elevator safety clamp is faulty or the related sensor is faulty.

Toshiba is located in Japan. Toshiba Elevator has a series of elevator products that combine Toshiba's cutting-edge technology, including magnetic suspension guide shoes, the world's fastest elevator with Guinness World Records, and double-deck cars that automatically adjust the floor spacing.