The FrigoPack BLU Kompakt plug-and-play standard switch cabinet from German controls company KIMO enables the operation of up to two compressors with a maximum refrigerating capacity of 50kW.

To commission the unit, refrigeration engineers will simply have to connect the power cables to the mains and motor as well as the pressure transmitter and safety circuits. At the heart of the compact switch, the cabinet is a preset FrigoPackE FU+ frequency inverter with smart refrigeration software and a full-text display. The integrated FrigoComp control module carries out a range of monitoring tasks. For example, it controls the system status and displays it with green and red LEDs. It also monitors individual components and raises an alarm if a component fails.

Users can choose between control of a single compressor and coupled control of two compressors. In the simplest version, when a single compressor is frequency-regulated, the maximum rated current of the compressor motor is 45A. With the dual-compressor solution, the maximum rated current of the compressor motor is 30A, and the contractor can choose between classic control and sequence changing.

With classic control, one compressor is controlled by the frequency inverter, and the second compressor is supplied directly from the electrical supply with on/off control. In contrast, with sequence changing, two identical compressors are speed-controlled alternately, with the other set at a fixed speed.

Ahmet Kitap, Head of Applications, KIMO, said: “As part of the coupled control of the FrigoPackE FU+, the condenser fan is controlled, by a 0 .. 10 V signal.”

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