The cooling controller ST181-LU3KAR.112 consists of a service plate and a separate power pack plate mounted in a separate casing. It is used for thermostatic temperature regulation in refrigerating plants. The controller is supplied with 230V AC and has four relay outputs as well as an exit for a 40W DC voltage fan. The number of revolutions can be decreased to 20% and thus create a minimum air speed. The relays can be used for different functions, e.g. for a compressor, a defroster, an alarm relay, etc. All inputs and outputs are connected by means of special plug-in connectors at the back of the control unit and easily accessible.
The front is provided with a 3-digit display, six control keys and a group of LEDs. This group indicates the status of the relay exits. The two LEDs on the right show the currently activated data set 1 or 2. A data set consists of setpoint, fan speed control mode and defrosting mode. Parametrisation takes place in several operating levels with increasing security level. The controller is networked via the ST-Bus interface.
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