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Interlift 2022

CANopen safety sensors detect shaft position

Elgo Batscale has announced its latest Limax Compact (LimaxCP) series. There are three options available for the programming of safety parameters. One is on-site, where the elevator system is used - via control system using CANopen.

The Limax 1/2/3CP series - safety sensors to detect absolute shaft position (Source: Elgo)

It is a fact that in many elevator shafts, constructors are faced with cramped installation conditions, said the company. The smallest possible use of space is therefore an elementary requirement for the necessary safety sensor technology. At Interlift 2022, Elgo presents in hall 3, stand 3165 its LimaxCP product series, a generation of safety sensors able to detect the absolute shaft position, speed, and further safety functions. The exhibition takes place from April 26 to April 29 in Augsburg (Germany) as an in-person event. The series comes with a CANopen interface and supports CiA 406 CANopen device profile for encoders (for car position and parameter transfer) and CiA 417 CANopen application profile for lift control systems.

The Limax1CP, including features like door bridging and safety circuit outputs, is designed particularly for this type of tight shaft, the company explained. No other modules are required. Inputs and outputs may be connected directly to the sensor. Furthermore, the Limax1CP is IP53 rated and resistant to shocks and vibrations. It measures 254 mm x 74 mm x 38 mm.

The safety functions of the Limax33CP (triggering of an electrically-operated safety gear, pre-disconnection in case of overspeed), currently in series production, has been integrated in the introduced Limax2CP, measuring 374,5 mm x 120 mm x 40 mm. The Limax3PC in the same housing will provide more safety functions, as well as three additional safe inputs and one additional safe output. Limax2CP and Limax3CP are available in protection class IP67 which makes them resistant for use in firefighting or outdoor elevators. Further safety features include: Test functions for safety brake and ETSL without the need for bridges, a range of UCM functions, separate inspection function of shortened shaft head/pit, prevention of safety brake being triggered during inspection mode, even if the car is positioned in the reduced protection area, integrated casing protection concept for IP54 and IP65, as well as automated test for unintentional door bridging in the door circuit.

The company gives customers the option of purchasing the LimaxCP without parametrization. The required safety parameters for elevator systems are thus only implemented at the time of installation. There are three options available for the programming of safety parameters:

  • At the Elgo site: parameter settings must be communicated when the order is placed
  • At the customer site: before delivery to the elevator system via a programming tool
  • On-site: where the elevator system is used - via control system using CANopen

All three processes are secured by the configuration process. The parameter settings are drawn up by the customer in the Elgo intranet and are protected against incorrect entry by 32-bit CRC, the company explained. To activate the sensor, the technician has to enter the CRC code on the sensor into the control system for verification. Each sensor comes with a QR code on its front that may be scanned using a mobile phone.


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Elgo Batscale


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