Due to the extreme climatic conditions especially in winter, up to 3-meter-long icicles can form in the shaft, which can be very dangerous for both staff and equipment. A bespoke sheet-metal construction on the elevator helps to safely break them.
For this purpose, ABB's contactless safety sensors Eden (IP69K models) were used, which indicate when the elevator is in a predefined position from which the icicles can be safely shattered using a predefined movement. For just such extreme temperatures or even environments with high humidity, vibrations or hazardous gases, the AC500-S offers an XC variant
for use in harsh conditions.
The main argument for purchasing the AC500-S was also that it is possible to program the safety functionalities using the Structured Text (ST) programming language with which the project engineers were already very familiar due to their experience with non-safety PLCs. ST allows for very flexible and fast programming, and programming errors can be detected with the ABB Safety Code Analysis (SCA) tool.
This code analysis tool from ABB can be used to verify safety-related programming rules according to IEC 61508-3 for the ST, FBD (Function Block Diagram) and LD (Ladder Logic) languages. The ABB SCA tool is the first of its kind and has been certified for applications up to SIL 3 (IEC 61508) and PL e (ISO 13849-1) after rigorous testing by TÜV SÜD.
The resulting code with a clear structure not only speeds up commissioning, but also significantly reduces certification and maintenance efforts after implementation. ABB's SCA tool was also used here to obtain project approval by the technical expert.
The possibility of trigonometrically controlled safety applications offered by the AC500-S controller is also a big plus. Our safety PLC supports complex safety arithmetic functions (SIN, COS, TAN, LOG, LN, SQRT, etc.) with floating point calculations, allowing the safely limited speed of elevators to be monitored dynamically and very precisely for the application.
In addition to installing the AC500-S safety PLC in the shaft elevator, the motors received an upgrade, new emergency stop buttons, switches and contactors were installed, as well as an ABB DCS drive and CP600 touch panels.