More than just pump protection – the plus of power measurement and integrated Modbus



The new pump protection device INT69 PYF Diagnose of the German Kriwan Industrie-Elektronik GmbH offers additionally a power measurement and integrated Modbus RTU interface. “This is the perfect connection between pump, protection and the digital world,” says Maximilian Egner, Key Account Manager.

The new pump protection module records measured values and operating data of the pump via integrated Modbus RTU interface and makes them available. This enables the operator to receive information and warnings at an early stage and to take countermeasures in advance before pump failures occur.

In addition the INT69 PYF Diagnose measures the active, reactive and apparent power as well as the power factor cosφ. As an additional function, counters for the active and reactive energy drawn are included in the integrated memory of the pump protection device. This allows the energy consumption of the pump to be displayed transparently. It is suitability for measuring the power of electric motors even when frequency converters are used. A new current transformer was specially developed for this purpose, which offers the highest possible measurement accuracy of amplitude and phase over a high useful and clock frequency range. The phase error is < 1° in the range of 20…100 Hz, which has a particularly positive effect on the accuracy of the active power. Depending on the decrease or increase of the power,

  • a dry run,
  • a closed wiper or
  • a blocking of the rotor in the motor

can be detected. The combination with further sensor data, such as motor and bearing temperature and vibration, provides further information on faults and malfunctions and offers extended protection.

Keeping an eye on the pump with the INTspector App

As is usual with all Kriwan Diagnose protection devices, the INT69 PYF Diagnostics can also access the data via the INTspector app and each input of the device can be set individually via the parameterization. With this app, the user can access to the protection device of the pump on site. In the app, helpful functions such as operating data, event lists with time stamps, error counters, operating times, switching cycles, current measured values and much more can be found under the Diagnosis section, thus enabling a detailed analysis of the pump.  With the help of the live diagnostics, all measured values can be recorded over a longer period of time and saved on a computer device (smartphone, tablet or laptop) as a CSV file. This saves the user expensive measuring equipment and uses the computer device as a data logger.

Each input in the protection device can be set individually in the programming. For example, the temperature inputs can be selected between PTC, Pt100, Pt1000 and bimetal. If an input is not used, it is set to disabled. It is also possible to program the warning, setpoint and shutdown values, tripping delays as well as restart delays or a locked shutdown without automatic restart for each input. Thus, each value can be programmed individually for each application. Even entire program data sets can be created, saved and reloaded via the INTspector App. This saves time for recurring applications.

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