Dixell XR77CX 5N6I3 cooling controller with four relays, RS485, RTC and dual power supply

The Dixell Model XR77CX, 32 x 74 mm, is a microprocessor controller suitable for medium and low temperature cooling applications. It has 4 output relays to control compressor, fan, defrost (electric or hot gas) and light or alarm (configurable). Includes RTC (Real Time Clock) circuitry that allows programming of up to 6 defrost cycle times, split between weekdays and days off. The "Day and Night" function, in turn, allows you to set two different desired temperatures to save energy during the night hours.

It is supplied with up to four NTC or Pt1000 inputs - one for temperature control, the other for evaporator defrost and fan control on the evaporator. One of the two digital inputs can be used as a third temperature input. The fourth input can be used to set the condenser temperature alarm or to display the condenser temperature. The controller has its own separate power supply from the power line, so that peripherals with different power supply or wiring can be used.

The serial interface allows the device to be connected to an RS485 ModBUS RTU network, such as the Dixell XWEB family of monitoring systems. The HOT Key interface allows quick and easy programming using the HOT Key or ProgToolKit.
The device is fully configurable with special parameters that can be easily entered using the keypad or ProgToolKit programming interface.