Abstract: A drive device of an elevator includes a frequency converter to be connected to a public AC supply network and an elevator motor. The frequency converter includes a network rectifier configured to be connected to the AC supply network, a motor bridge to be connected to the elevator motor and a DC intermediate circuit located between the network rectifier and the motor bridge. The motor bridge is controlled by a control circuit which feeds the motor bridge with control pulses to regulate the motor speed. The drive device further includes at least one drive prevention circuit connected between the control circuit and the motor bridge. The drive prevention circuit is configured to obtain a safety signal from an elevator safety circuit includes two separate safety input circuits each configured to be connected to the elevator safety circuit to receive a safety signal.

Abstract: A drive device of an elevator includes a frequency converter to be connected to a public AC supply network and an elevator motor. The frequency converter includes a network rectifier configured to be connected to the AC supply network, a motor bridge to be connected to the elevator motor and a DC intermediate circuit located between the network rectifier and the motor bridge. The motor bridge is controlled by a control circuit which feeds the motor bridge with control pulses to regulate the motor speed. The drive device further includes at least one drive prevention circuit connected between the control circuit and the motor bridge. The drive prevention circuit is configured to obtain a safety signal from an elevator safety circuit includes two separate safety input circuits each configured to be connected to the elevator safety circuit to receive a safety signal.

Abstract: A monitoring arrangement including a drop-out safety device associated with an elevator; an elevator component in operational connection with the drop-out safety device of the elevator; a measuring device configured to generate measuring data associated with operation of the elevator component; and a monitoring unit configured to, record, in a memory, one or more limit values associated with the measuring data, receive the measuring data from the measuring device, compare the measuring data to the one or more limit values, and—determine that the operating safety of the drop-out safety device is endangered, if the measuring data deviates from the one or more limit values, and form a monitoring signal, if the monitoring unit determines that the operating safety of the drop-out safety device is endangered.

Abstract: A monitoring arrangement of an elevator and to a method for monitoring an elevator. The monitoring arrangement of an elevator comprises a drop-out safety device of the elevator, an elevator component, which is in operational connection with the drop-out safety device of the elevator, a measuring device, with which the operation of the aforementioned elevator component is measured, and also a monitoring unit, comprising an input for the measuring data of the aforementioned measuring device as well as a memory for setting one or more boundary conditions to be connected to the safe operation of the elevator component. The monitoring unit is configured to receive measuring data from the aforementioned measuring device and also to determine that the operating safety of a drop-out safety device of the elevator is endangered if the measuring data received does not fulfill the boundary conditions set for the safe operation of the elevator component.

Abstract: The invention relates to a power supply arrangement of a transport system. The transport system comprises a motor for moving the transport appliance; a power supply circuit of the transport system, for supplying power between the power source of the transport system and the motor; a power controller of the energy storage, which power controller comprises at least one controllable switch; an energy storage, which is connected to the power supply circuit of the transport system via the power controller of the energy storage; and also a power control, which is fitted to control the aforementioned at least one controllable switch of the power controller of the energy storage, for adjusting at least one electrical magnitude relating to the power supply between the power supply circuit of the transport system and the energy storage. The power controller of the energy storage is fitted to discharge the aforementioned energy storage with a power limitation.

Abstract: A transportation system and a method are provided for backing up the operational state of a transportation system. The transportation system includes a control apparatus for controlling the operation of the transportation system. The control apparatus further includes capacitive energy storage and a power supply backup circuit adapted to maintain power supply from the said energy storage to a storage circuit for a given length of time in connection with an operational anomaly in power supply to the control apparatus.

Abstract: A transportation system and a method are provided for backing up the operational state of a transportation system. The transportation system includes a control apparatus for controlling the operation of the transportation system. The control apparatus further includes capacitive energy storage and a power supply backup circuit adapted to maintain power supply from the said energy storage to a storage circuit for a given length of time in connection with an operational anomaly in power supply to the control apparatus.

Abstract: The invention relates to a power supply arrangement of a transport system. The transport system comprises a motor for moving the transport appliance; a power supply circuit of the transport system, for supplying power between the power source of the transport system and the motor; a power controller of the energy storage, which power controller comprises at least one controllable switch; an energy storage, which is connected to the power supply circuit of the transport system via the power controller of the energy storage; and also a power control, which is fitted to control the aforementioned at least one controllable switch of the power controller of the energy storage, for adjusting at least one electrical magnitude relating to the power supply between the power supply circuit of the transport system and the energy storage. The power controller of the energy storage is fitted to discharge the aforementioned energy storage with a power limitation.

Abstract: A method of and apparatus for regulating the control voltage of a three-phase inverter supplying an a.c. motor are provided, the inverter having a power stage implemented with semiconductor switches, and the output voltage of each inverter phase being measured in the voltage control. For rapidly improving the curve shapes of the inverter output by means of feedback, the control voltage of the pulse width modulator of each inverter phase is regulated by a voltage regulator. The control voltage obtained as output of the voltage regulator is derived from an actual value voltage formed from the output voltage of each inverter phase and a reference voltage.