Market leading manufacturer of speciality ice cream machines Kälte-Rudi has selected Mitsubishi Electric FR-E740 frequency inverters with stall prevention for its range of ice cream machines and pasteurisers.  Their mobile machines are mainly used by ice cream parlours, bakeries, confectioners and commercial kitchens.

Compared with supermarket ice cream, traditionally produced ice cream is firmer and contains less water. When the machine is mixing several litres of ice cream, it is only the movement of the ice cream that keeps it “liquid”. Like any dairy product, you can’t refreeze ice cream that has melted So if the motor stalls during the mixing process, the product would be rendered useless; the ice cream maker would also have wasted all the ingredients as well as the power for the drive and time for cleaning.

Integrated stall prevention

The integrated stall prevention in the FR-E700 series ensures that the paddle can continue to turn even when the motor is operating within its overload range.  Evaluation demonstrated that stall prevention can be used to control overloading. If the motor goes into its overload range, the inverter will continue to operate at a reduced speed, so the mixing of the ice cream continues and the product remains intact.

Besides stall prevention, the inverter enables a measurable reduction in power, between 15 and 40 per cent depending on the machine and its configuration. “A maximum potential saving on power of 40 percent is quite respectable for motors with an output of up to six kilowatts,” remarks Markus Moosmann of Kälte-Rudi, who continues:  “The Mitsubishi Electric inverter  is much more sophisticated than the product we used before. The integration, handling and adding optional functions such as the Profibus connection are very easy via the connector system. The products are also extremely reliable and have convinced us even under the harshest operating conditions.  In addition, Mitsubishi Electric’s global service network covers all our markets, which is a major advantage if service is required.”

The network capability with the Profibus connection was particularly important to Kälte-Rudi. It enables the machine building experts to monitor the operation of the inverter in real-time. Diagnostics blocks can be programmed and any data can be read out via the software immediately.

The integrated safety-off function in accordance with EN 12855 enables a high level of operational safety as the control and regulation circuits of the inverter operate independently from each other. For emergency cases, it provides a safe and direct stop of the paddle.

Go here for the full press release from Mitsubishi Electric UK

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