Eaton Freedom 2100 Installation And Maintenance Manual

Contents

- Page 15 - I.B. 8926-1DEVICE SELECTIONArticles 240 and 430 of the NEC contain the rules forselecting fuses, circuit breakers and overload relays bytype and by voltage and ampere rating. Follow theserules for feeder circuits, and the instructions attached tothe inside of the left-most vertical wireway door, for mo-tor branch circuits. Select and install overload relay cur-rent elements (heaters) based on the motor service fac-tor and full-load current. Ambient compensated over-load relays are used in motor control centers (MCC’s) tooffset the temperature gradient which occurs from top tobottom in a loaded vertical section.HEATERS MUST BE INSTALLED IN THE STARTEROVERLOAD RELAY ASSEMBLIES BEFORE THESTARTER IS ENERGIZED.C306 THERMAL OVERLOAD RELAYS (Fig. 24)C306 Overload Relays are provided on Freedom Start-ers. Four sizes are available for overload protection upto 11 4 amperes. Features include:• Selectable Manual or Automatic Reset operation.• lnterchangeble Heater Packs ajustable ±24% tomatch motor FLA and calibrated for use with 1.0 and1.15 service factor motors.Heater packs for 32 ampere overload relay will mountin 75 ampere overload relay-useful in derating appli-cations such as jogging.• Class 1 0 or 20 heater packs. (Fig. 24) Use Class 10 heaters with fusible or thermal magnetic breakerdisconnects only.• Bimetallic, ambient compensated operated. Trip freemechanism.• Electrically isolated NO-NC contacts (pull RESETbutton to test).• Overload trip indication.• Single phase protection.• UL listed, CSA certified and NEMA compliance.C306 OVERLOAD RELAY SETTINGFLA DIAL ADJUSTMENT- For motors having a 1.15service factor, rotate the FLA adjustment dial to corre-spond to the motor’s FLA rating. Estimate the dial posi-tion when the motor FLA falls between two letter valuesas shown in Fig. 23.For motors having a 1.0 service factor, rotate the FLAdial one-half postion counterclockwise (CCW).MANUAL/ AUTOMATIC RESET -The overload relay isfactory set “M” for manual reset operation as shown inFig. 23. For automatic reset operation, turn the resetadjustment dial to the “A” position.Automatic reset is not intended to two-wire devices.TEST FOR TRIP INDICATION -To test overload relayfor trip indication when in manual reset, pull out the bluereset button. An orange flag will appear indicating thatthe device has tripped. Push reset button in to reset.TEST FOR TRIP INDICATION - To test overload relayfor trip indication when in manual reset, pull out the bluereset button. An orange flag will appear indicating thatthe device has tripped. Push reset button in to reset.WARNING -To provide continued protection against fireor shock hazard, the complete overload relay must bereplaced if burnout of the heater element occurs.PART 6OVERCURRENT PROTECTION DEVICESFig. 23 Overload Relay SettingsFig.24 C306 Thermal Overload Relay and Heater Pack.