Patent ID: 7849975

Claim:
A safety arrangement of an elevator, which elevator comprising an elevator control system, an elevator motor, a power supply circuit of the elevator motor as well as at least one mechanical stopping appliance for preventing movement of the elevator car, the safety arrangement comprising: a measuring arrangement for monitoring the safety spaces of the elevator; a control unit; a first data transfer channel between the said measuring arrangement and the control unit; a second data transfer channel between the elevator control system and the control unit; wherein the measuring arrangement for monitoring the safety spaces of the elevator comprises: normal drive limit switches in an upper part and a lower part of an elevator shaft for setting the end limits of movement of the elevator car in normal drive, service space limit switches in the upper part and the lower part of the elevator shaft for setting service spaces in the elevator shaft, which service space limit switches are situated farther from the ends of the elevator shaft than the normal drive limit switches, wherein the measuring arrangement for monitoring the safety spaces of the elevator comprises service drive sensors in the upper part and the lower part of the elevator shaft for setting the end limits of movement of the elevator car in service drive permitted mode, which service drive sensors are situated farther from the ends of the elevator shaft than the service space limit switches, and wherein the control unit stops the elevator car by controlling the mechanical stopping appliance when the elevator car reaches the service drive sensors and then permits the elevator control system to start another run, the control unit switching to a drive prevented mode if the elevator car reaches a service space limit switch, and a manually operated return appliance to cancel the drive prevented mode.