EVDPlus is a controller featured two drivers for double pole stepper motor which manages two electronic expansion valves. EVDPlus controls refrigerant superheat and optimizes the efficiency of the refrigerant circuit, guaranteeing maximum flexibility, being compatible with various types of refrigerants and valves (Danfoss, Parker Sporlan, Emerson/Copeland, CAREL, SANHUA, HONGSEN etc.). It features low superheat (LowSH), high evaporation pressure (MOP), and low evaporation pressure (LOP) protection, and can manage, as an alternative to superheat control, special functions such as the hot gas bypass, evaporator pressure regulation (EPR) and control of the valve downstream of the gas cooler in transcritical CO2 circuits.
EVDPlus controller can be connected to either of the following:
• a UX* controller via RS485/Modbus;
• a supervisor or IoT platform via RS485/Modbus.
In this case, On/Off control is performed via digital input 1 for EEVA and digital 2 for EEVB, if suitably configured. As
well as regulation start/stop, digital inputs 1 and 2 can be configured for the following:
- valve regulation optimization after defrosts;
- valve forced open (at 100%);
- regulation backup;
- regulation security.
Another possibility involves operation as a simple positioner with 4 to 20 mA or 0 to 10 Vdc analogue input signal.
EVDPlus has two build-in LED displays and one keypad with four keys, so that the user can change/configure
parameters easily. normally, the user just needs 4 parameters to start basic regulation:
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