Abstract: In order to provide a control unit which can cooperate with a great variety of operating units and/or status acquisition units, it is proposed that the control unit comprises a base module which has at least one processor and at least one memory store for the required program code for operating the processor and terminals for operating units carrying out basic functions and/or status acquisition units and that the processor and the program code stored in the memory store are configured such that therewith additional functions of an additional module connectable to the base module are also executable.

Abstract: A measurement circuit according to the invention for temperature monitoring has a quantitative temperature sensor and at least one qualitative temperature sensor, the quantitative temperature sensor and the at least one qualitative temperature sensor being connected in series, the quantitative temperature sensor having a consistent characteristic line which increases in a strictly monotonous manner or a consistent characteristic line which decreases in a strictly monotonous manner and being dedicated to the precise temperature measurement, and the qualitative temperature sensor having a nominal response temperature at which the resistance value changes in a non-linear manner and being dedicated to the monitoring of limit temperatures.

Abstract: Process for regulating a compressor with motor for a refrigerating system, where the temperature of the cooling site is regulated through an on-off motor mode if the temperature in the compressor exceeds an upper temperature threshold. In addition, the temperature of the cooling site is regulated through a continuous on mode of the motor as soon as the motor has cooled to a lower temperature threshold. The controller converts a variable corresponding to the cooling requirement of the cooling site into a switch signal for a valve, which results in clocked opening and closing of the valve, or uses a frequency converter, which controls the cooling liquid flow through the compressor by regulating the voltage and the frequency of the motor in that the frequency converter converts a variable corresponding to the cooling requirement of a cooling site into a voltage and a frequency for the motor.

Abstract: A measurement circuit according to the invention for temperature monitoring has a quantitative temperature sensor and at least one qualitative temperature sensor, the quantitative temperature sensor and the at least one qualitative temperature sensor being connected in series, the quantitative temperature sensor having a consistent characteristic line which increases in a strictly monotonous manner or a consistent characteristic line which decreases in a strictly monotonous manner and being dedicated to the precise temperature measurement, and the qualitative temperature sensor having a nominal response temperature at which the resistance value changes in a non-linear manner and being dedicated to the monitoring of limit temperatures.

Abstract: Process for regulating a compressor with motor for a refrigerating system, where the temperature of the cooling site is regulated through an on-off motor mode if the temperature in the compressor exceeds an upper temperature threshold. In addition, the temperature of the cooling site is regulated through a continuous on mode of the motor as soon as the motor has cooled to a lower temperature threshold. The controller converts a variable corresponding to the cooling requirement of the cooling site into a switch signal for a valve, which results in clocked opening and closing of the valve, or uses a frequency converter, which controls the cooling liquid flow through the compressor by regulating the voltage and the frequency of the motor in that the frequency converter converts a variable corresponding to the cooling requirement of a cooling site into a voltage and a frequency for the motor.