FDC1 - C&S Electric Limited

High-Tech RangeFDC1- DC Voltage RelayC&S Electric Limited(Protection & Control Division)

ContentsPage No.1. Introduction 32. Application 33. Characteristics and Features 34. Working Principle 35. Design 4-55.1 Connection5.1.1 Voltage Measuring Inputs5.1.2 Output Relays5.2 Front Plate5.2.1 LEDs5.2.2 Keypads6. Operation & Settings 5-66.1.1 Setting of Pickup Value for over Voltage Supervision U>/U>>6.1.2 Setting of Pickup Value for Under Voltage Supervision U

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

5. Design5.1 Connectionsexternal/ResetL+/L L-/NC9 E9 D9 C8 D8D1PowerSupply~externalResetRelay1C1E1D2C2E2D3+A3A4SELECT/RESETRelay2C3E3D4C4E4+-ENTERTRIPFig. 5.1: Connection diagram5.1.1 Voltage measuring inputsDC voltage is connected to the protection relay viaterminals A3 and A4.5.1.2 Output RelaysThe FDC1 is equipped with two relays forundervoltage and overvoltage supervision each withtwo change over contacts. Relays selection for differentvoltage elements is users configurable.4

5.2 Front Plate6. Operation and settings6.1.1 Setting of pickup value for overvoltage supervision U>/U>>With the aid of keypad available at front plate pickupvalue of over voltage element U>,U>> could beadjusted in the range of 50-250% of Un.6.1.2 Setting of pickup value for undervoltage supervision U

6.2 Reset6.2.1 ManualBy pressing pushbutton the trippingrelay is reset and LED U willextinguish.The auxiliary power supply rating corresponds to theauxiliary voltage on sight.The voltage transformer circuits are connected tothe relay correctly.All control and measuring circuits as well as theoutput relays are connected correctly.6.2.2 RemoteTerminal C8 and D8 could be used to reset the trippingrelay externally.7. Setting Ranges8.1 Power ONPrior to switch ON the auxiliary power supply, be sure thatthe auxiliary supply voltage corresponds with the rateddata on the type plate.When the auxiliary supply is switched ON (terminals C9& E9) please observe that the LED ‘ON’ alight.ParametersSetting Ranges8.2 Secondary TestVr 10-400V8.2.1 Test EquipmentU>/U>>50-250% of VrVoltmeter with class 1 or better.U0.1-60sDC voltage supply (adjustable range of Un).tu

9. Technical Data9.1 Measuring InputRated DataThermal withstand capability in voltage circuit : Continuously 1.25 x Vr9.2 Auxiliary VoltageRated auxiliary voltage : 16-270V AC/16-360V DC9.3 Common DataDrop-out ratio : U>:>97%: U

9.6 Dimensional Details18815736167268.7136.5142136.5Cut Out DimensionsInstallation Depth : 275mmAll dimensions in : mm10. Order FormDC Voltage RelayFDC1Under VoltageOver VoltageUnder and Over VoltageUOUOC&S Electric Limited(Protection & Control Division)44, Okhla Industrial Estate, New Delhi -110 020 (INDIA)Phone : +91 11- 66602414, 30883745/54/64 Fax: +91 11- 66602413E-mail: cspc@cselectric.co.in Web : www.cselectric.co.inMarketing Offices :AHMEDABAD: +91 79 30074534/35/36 FAX : +91 79 30074519 BANGALORE: +91 80 25586147, 25594939 FAX : +91 25584839BHUBANESWAR : +91 674 2507265 FAX : +91 674 2507265 CHANDIGARH : +91 172 272613, 3062624 FAX : +91 172 2726153CHENNAI : +91 44 39180531/32/33/34 FAX :+91 44 39180514 DELHI : +91 11 30838822-25 Fax :+91 11 30838826 HYDERABAD : +91 40 27813003FAX : +91 40 27812987 KOLKATA : +91 33 22275850/51 FAX : +91 33 22275849 MUMBAI : +91 22 24114727/28 FAX : +91 22 24126631NAGPUR : +91 712 5616651 FAX : +91 712 5616651 PUNE : +91 20 30283244/45 FAX : +91 20 30283245 RAIPUR : +91 771 320852433/34