A handrail tension monitoring device for a passenger transport system designed as a moving walkway or escalator can include a distance sensor and a signal processing unit. Measurement signals detected by the distance sensor can be processed and evaluated in the signal processing unit. A vibration frequency of a scanned handrail of the passenger transport system can be determined from the signal curve of the measurement signals and the vibration frequency can be compared with a lower threshold value or upper threshold value. An alarm signal can be generated if the lower threshold value is not reached and a warning signal can be generated if the upper threshold value is exceeded.

A method detects an arrival of a maintenance person to a maintenance site. The method includes: scanning radio transmissions from radio devices residing within a radio range of a mobile terminal device carried by the maintenance person; detecting amongst the scanned radio transmissions at least one radio transmission from at least one radio node arranged to the maintenance site for which the maintenance person has at least one open maintenance order; and generating to a remote monitoring unit at least one first control signal including information representing the detection of the arrival of the maintenance person to the maintenance site. Also provided is a detection system, a mobile terminal device, a computer program, and a tangible non-volatile computer-readable medium for detecting an arrival of a maintenance person to a maintenance site.

A method for detecting a loss or an undervoltage condition of phase of an electric converter unit, wherein the method comprises: determining an extremum value, such as a maximum and/or a minimum value, of a phase voltage of the electric converter unit for at least one fundamental period of the phase voltage, and comparing the extremum value to a first threshold value, and if, based on the comparison, a first threshold criterion related to the first threshold value is satisfied, then determining the loss or the undervoltage condition of phase.

An vertical transportation elevator, escalator, dumbwaiter and lift systems monitoring, maintenance, repair, inspection, testing and modernization system and method is provided. The system and method may provide real-time information to a technician, buildings, property managers, facility managers, owners of building, building engineers, regarding the current state of the equipment, status of inspections, status of testing, repairs, modernization history of maintenance real time maintenance performed on equipment and characteristics of the equipment, and future requirements of the elevator.

The present invention relates to a conveyor system comprising: a drive machine, a conveyor control unit configured to control operation of a conveyor device, a sensor array comprising at least one sensor mounted to the drive machine and adapted to measure one or more properties of the drive machine, a processing unit associated with the drive machine, wherein the processing unit is connected to the sensor array and configured to obtain and process measurement data from the sensor array to generate in-formation about an operation of the drive machine, and a communication channel between the conveyor control unit and the processing unit. The conveyor system may be an elevator system, an escalator system or a moving walk system.

A passenger conveyor diagnostic system includes a processor that stores at least one visual inspection diagnostic, and a passenger conveyor system including at least one sensor configured to capture one or both of an image and a sound. The processor applies the at least one visual inspection diagnostic to one or both of the image and the sound to generate a diagnosed status of the passenger conveyor system, and overlays the diagnosed status of the passenger conveyor system on the image.

A monitoring system for monitoring an escalator is provided including: a local gateway device; and a sensing apparatus in wireless communication with the local gateway device through a short-range wireless protocol, the sensing apparatus including: a frequency detection device configured to detect frequency data of the escalator, wherein the sensing apparatus is configured to obtain a specific frequency of a component of the escalator and detect at least one of a change in the specific frequency of the component to a sub-frequency, a direction shift of the specific frequency of the component, and a change in a harmonics of the specific frequency of the component in response to the frequency data.

A device for monitoring an operating state of a control device of a passenger transport system includes a detection unit for generating a first electrical quantity depending on a signaled state of the control device, an evaluation unit for analyzing the first electrical quantity in relation to the operating state of the control device, and an interface for transmitting a second electrical signal that is dependent on the analysis and is generated in the evaluation unit. The detection unit is a conversion device for converting an optical signal of at least one optical indicator of the control device into the first electrical signal. The device for monitoring allows state information on the control device to be tapped without conversion work being required on the control device.

Provided is a passenger-conveyor step-chain monitoring system capable of monitoring elongation of a step chain without adding a special device. The passenger-conveyor step-chain monitoring system includes a monitoring unit configured to monitor elongation of a step chain attached to a step of a passenger conveyor based on a result of detecting the step by a sensor provided to detect an absence of the step. With this configuration, it is possible to monitor elongation of the step chain without adding a special device.

Chain tension monitoring device (40) is configured for monitoring a chain tension force (F.sub.C) of a drive chain (27) extending in a longitudinal direction forming closed loop between two sprockets (26, 28). The chain tension monitoring device (40) comprises a sensor device (41) configured for mechanically contacting the drive chain (27), detecting movement of the drive chain (27) transversely, in particular orthogonally, to the longitudinal direction of the drive chain (27), and providing a detection signal indicating the detected movement of the drive chain (27); and an evaluator (50) configured for receiving the detection signal provided by the sensor device (41) and determining a chain tension force (F.sub.C) of the drive chain (27) from said detection signal.