| 摘要 |
An alternative elevator safety circuit which can be used in a method to decelerate an elevator car during an emergency stop in a more controlled manner. The safety circuit comprises a series chain of safety contacts (S1-Sn) having an input (T1) connected to a power source (PS) and a first safety relay (7) deriving electrical power from an output (T2) of the series chain of safety contacts (S1-Sn). A delay circuit (13) is arranged between the output (T2) of the series chain of safety contacts (S1-Sn) and the first safety relay (7). Hence, if any of the safety contacts open to initiate an emergency stop, any process controlled by the operation of the first safety relay is delayed. |
