The XEV22D module is able to drive a large variety of stepper electronic expansion valves. XEV22D permits to regulate the superheat (SH) of the fluid that runs into refrigerating unit in order to obtain optimized performance and a functioning of the evaporator independent by climatic or load conditions. XEV22D modules are equipped with two probe inputs, one for 4 to 20mA or 0 to 5V pressure transducer and another one for NTC-EU, NTC-US or Pt1000 temperature probe. A LAN connection permits to transmit the pressure signal to others XEV modules in order to use only one pressure transducer in multiplexed cabinet applications.
There are also two configurable digital inputs, the first one is free of voltage and the other ones is at high voltage in order to simplify connections with cooling request signal. With the useful display it’s possible to see the value of superheat (SH), the degree of opening of the valve or the probe values, the local keyboard allows programming the instrument without any other devices. To complete instrument equipment, a RS485 serial link permits to connect XEV22D to Dixell monitoring and supervising systems.