FDC1 - C&S Electric Limited

1. IntroductionFDC1 series of relays are based on latestmicrocontroller based design technique. FDC1 areequipped with a display to indicate measurements andsettings and keys are provided for settings. FDC1 is aflush mounted type of relay.Separately adjustable, independent timers forU.Independent trip delays of the individualelements.Wide operating ranges of the supply voltage (AC/DC).Password protection.2. Application4. Working principleFDC1 is a D.C. voltage supervision relay used e.g. forsupervision of intermediate circuits, station batteries orstarter batteries etc. There are three varients of therelay i.e. FDC1-U for under voltage protection,FDC1-O for over voltage protection, FDC1-UO forover and under voltage protection.3. Characteristics and FeaturesFDC1 is equipped with two stage independent underand over voltage supervision with adjustable pickupvalues and tripping time delays.The analog voltage is subsequently filtered in order tominimize the influence of disturbing voltages, thevoltage is compared with the set reference value, if thevoltage falls below or exceeds the set reference valuea time circuit is activated and appropriate relay trips.Microcontroller based design.Voltage supervision with two stage under and overvoltage function.Extremely wide setting ranges and fine steps, withthe help of push buttons.3