Skip to Main Content
This paper presents an open, multilevel condition monitoring system for induction motors (IMs). The current, voltage, speed and temperature values of the IM are measured with commercial, industrial equipment (power analyzer, temperature relay), and transmitted to a programmable logic controller (PLC) through a MODBUS industrial network. The PLC program, developed under the IEC-61131-3 standard, performs protection logic and transmits the data to a supervision computer using an OPC (Ole for Process Control) data communications server. An OPC client component has been inserted into a SCADA program, which displays the motor status and stores it to perform trend analysis. The use of open specifications for data communications and PLC software development has allowed the construction of the proposed system using industrial, commercially available components, instead of requiring custom developed equipment. This approach also facilitates its integration into information networks at the enterprise level. Experimental results with a commercial 1.1 three-phase IM show the feasibility of the proposed system.