Sensors for measuring motor and bearing temperature

Drive motors in cranes have to be protected against destruction by heat. To achieve this, temperature sensors are embedded in the enameled copper motor windings and evaluated by protective relays or a PLC. It is also advisable to monitor function-critical bearings; increased friction causes temperatures to rise, which in turn causes mechanical wear or damage. 

For this purpose KRIWAN offers a wide range of PTC, NTC, Pt100, and Pt1000 sensors. Fully automated quality control at each stage of production combined with documentation of results help these sensors to set quality standards that place them among the best products available. Our PTC sensors are produced in a globally unique fully automated production facility operating at the highest level. That is the reason why several of Europe’s and the world’s leading manufacturers of electric motors have been relying on KRIWAN sensors for decades.


Dependable phase monitoring in crane drive motors

Electric current is used to operate many stationary cranes and hoists. However, the quality of electricity supplied in networks around the world can vary greatly. Cranes sold and operated globally have to be protected against the risks associated with electrical network problems. 

Dangers include phase asymmetries, phase failure, and undervoltage in power grids. These can increase the heat of the motor and cause irregular operation, shortening the life-span of the unit. 

The INT69 Y platform is the solution for cranes equipped with three-phase motors. INT69 Y devices reliably monitor all three phases for asymmetry, failure, and faults, and protect electric motors against risks by taking them out of service. 


With its new generation of INT69 Diagnosis, Kriwan has made its flagship protection module even more powerful.

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Motor protection based on PTC sensors is an effective and reliable way of protecting against thermal overload in electrical machinery.

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