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rectly installed, the circuit breaker cannot be reset orplaced in the ON position.Before the rating plug can be installed, the transparent trip unit cover must be removed from the circuit breaker.To install the rating plug on Digitrip RMS Models 510,interlock button to point towards the REMOVE position.a.Remove transparent trip unit cover after looseningthe four thumbscrews.b.Make sure arrow on rating plug interlock button ispointing at REMOVE. Adjust, if necessary, using ac.d.Push the rating plug in as far as it will go. Theelectrical contact pins will enter matching holes inthe trip unit. A springiness will be felt when the rating plug bottoms in the trip unit.Note: If unit is a Digitrip RMS 310, and an adjustablerating plug is installed, set rating plug switch markedA, B, C, D to the current rating desired.g.BEFORE YOU FIT THE RATING PLUG INTO THETRIP UNIT, BE SURE TO CHECK THAT THEBREAKER TYPE AND FRAME RATING (ORSENSOR RATING IF APPLICABLE), MATCHTHOSE PRINTED ON THE RATING PLUG COVER.INSTALLING A RATING PLUG THAT DOES NOTMATCH THE BRAKER TYPE AND FRAMERATING (OR SENSORRATING, IF APPLICABLE),CAN PRODUCE SERIOUS MISCOORDINATIONAND/OR FAILURE OF THE PROTECTIONSYSTEM.3.3 Trip Unit RemovalUse the following instructions to remove a Digitrip trip unitfrom a circuit breaker.Position the rating plug over the trip unit as shownin Fig. 3.5. The pin on the rating plug shaft mustline up with the matching slot in the trip unit.lock button. Press in approximately 1/16-inch andturn button 90 clockwise to the “ENGAGED” position.f.WARNINGAfter adjusting trip unit settings to the desired settings, close the rating plug's hinged cover and reinstall trip unit transparent cover. Secure in positionwith four thumbscrews.Circuit breaker can now be reset and switched tothe ON and OFF positions.WARNINGTHE VOLTAGES IN ENERGIZED EQUIPMENT CANCAUSE DEATH OR SEVERE PERSONAL INJURY.BEFORE REMOVING THE COVER OF AN R-FRAMECIRCUIT BREAKER MOUNTED IN AN ELECTRICALSYSTEM, MAKE SURE THERE IS NO VOLTAGE ATLINE OR LOAD TERMINALS. SPECIAL ATTENTIONSHOULD BE PAID TO REVERSE FEED APPLICATIONS TO ENSURE NO VOLTAGE IS PRESENT.a.Press the Push-to-Trip button in the circuit breakercover to trip the circuit breaker.b.Remove eight cover screws and circuit breakercover.c.Remove the rating plug. Flip the hinged coveropen. Turn the interlock button counter clockwise tothe REMOVE position. Rating plug will raiseslightly. Grasp rating plug and pull out gently. Makesure pin in shaft lines up with slot in trip unit. Adjustposition of interlock button as required to ensure asmooth withdrawal of the shaft.screwdrivers, lift up on the spring clips located ateach end of the trip unit (see Fig. 3.5).EATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comPage 5

e.With the screwdrivers in position, gently rock thetrip unit from side to side until it works free from thecircuit breaker.3.4 Trip Unit ReplacementMake sure the trip unit to be installed is suitable for theintended installation by comparing the trip unit catalognumber with the nameplate on the circuit breaker framelocated to the right of the handle. Rejection pins are usedin the circuit breaker frame to prevent the installation ofan incorrect trip unit.a.Remove any existing trip unit by following theprocedures in paragraphs 3.3.a through e.Note: The replacement trip unit should be installedbefore the circuit breaker cover is re-installed.b.Position the replacement trip unit above the whiteterminal block to the left of the circuit breaker handle. Align the protruding circuit board with the mating slot in the white terminal block (see Fig. 3.7).c.Carefully press the trip unit into place. A sharp clickwill be heard as the retaining springs click into position.d.Install rating plug (see paragraphs 3.2.b through e).e.Reinstall the circuit breaker c over. Torque coverscrews to 24 in-lbs.4.0 DIGITRIP RMS MODEL CONSIDERATIONS4.1 Digitrip RMS 310The Digitrip RMS 310 Trip Assembly consists of a DigitripRMS 310 Trip Unit as described in I.L. 29C883, 3 or 4auxiliary current transformers and a stab-in trip unit terminal block as shown in Figs. 4 and 5.The fourth auxiliary current transformer is supplied whenthe optional ground fault or neutral protection function isselected in the trip unit. Also, a side mounted 4-point terminal block is provided to pre-wire the mode of groundfault sensing used, i.e., residual or source ground. Theseconnections are shown in Fig. 16.Fig. 3.7. Installation of Trip UnitCAUTIONIN A DRAWOUT MOUNTED BREAKER TESTING OF ACIRCUIT BREAKER BY INITIATING A TRIP OPERATIONWHILE IN THE CELL " CONNECTED" POSITION BYTHE EXTERNAL TEST KIT OR THE INTEGRAL TESTPROVISIONS IN THE DIGITRIP RMS TRIP UNIT ISNOT RECOMMENDED.THE TRIPPING OPERATION OF THE CIRCUITBREAKER WILL CAUSE DISRUPTION OF SERVICEAND POSSIBLY PERSONAL INJURY RESULTINGFROM UNNECESSARY SWITCHING OF CONNECTED EQUIPMENT.TESTING OF A CIRCUIT BREAKER SHOULD BEDONE ONLY IN THE " TEST" , " DISCONNECTED" OR“ WITHDRAWN" CELL POSITIONS.WHERE A CIRCUIT BREAKER TRIP OPERATION ISDESIRED FOR A FIXED MOUNTED CIRCUITBREAKER, TESTING SHOULD BE CONDUCTEDONLY WHEN THE EQUIPMENT IN WHICH THEBREAKER IS MOUNTED IS COMPLETELY DE-ENERGIZED.EATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comPage 6

Effective Date October 2010Instruction Leaflet 29C713EEffective October 2010Fig. 4. View of 1600A, Type R-Frame Circuit Breaker with Front Cover Removed to Expose Digitrip RMS Trip Unit4.2 Digitrip RMS 5104.3 Digitrip RMS 610The Digitrip RMS 510 Trip Assembly consists of a DigitripRMS 510 Trip Unit as described in I.L. 29-885, 3 or 4 auxiliary current transformers and a stab-in trip unit terminalblock as shown in Figs. 4 and 5.The Digitrip RMS 610 Trip Assembly consists of a DigitripRMS 610 Trip Unit as described in l.L. 29-886, 3 or 4 auxiliary current transformers, a stab-in trip unit terminalblock and a Power/Relay module mounted as illustratedin Figs. 4 and 5. The Digitrip RMS 610 Trip Unit is similarto a Digitrip RMS 510 Trip Unit with the addition of a fourdigit display, three-phase (lA , I B , I C ) and one ground current (I G ) or one neutral current ( ID ) green pointer LEDsalong with a stepping push button as illustrated inTable 1. Signal contacts are provided for hard wiringthree remote mode of trip indicators (long delay, short circuit, ground fault) and a High-Load remote alarm.The fourth auxiliary current transformer is supplied whenthe optional ground fault protection function is selected inthe trip unit. Also, a side mounted 4-point terminal blockis provided to pre-wire the mode of ground fault sensingused, i.e., residual or source ground.The trip unit contains a receptacle for use with anoptional Auxiliary Power module (Cat. No. PRTAAPM).When this module is plugged in the trip unit and connected to a 120V, 50/60 Hz supply, the circuit breaker canbe bench tested using the integral test panel. With the circuit breaker in the closed position, it can be "tripped”when the test selector switch is in either the "6T ” or “GFT ”positions.EATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comThe ground current pointer LED and ground fault mode oftrip signal contact are supplied only when the groundfault protection function is provided in the trip unit.A 120V, 50/60 Hz 6 VA Power/Relay module is standardfor operating the display and internally mounted signalrelays. The relay contacts are each rated 120V, 1.0A. A230V 50/60 Hz 6 VA power relay module is also available.Page 7

Effective Date October 2010The Power/Relay module will maintain the cause of tripLEDs history and trip history as long as the control powersupply is available. With loss of the control power supply,only the cause of trip LEDs will be maintained by theback-up battery located in the rating plug.The High-Load message and remote alarm switch arepre-set at 85% of the value of the long delay setting. TheHigh-Load relay operates and the LED turns "ON ” whenthe 85% level is exceeded only after an approximate 40second delay to ride through momentary High-Load conditions.4.4 Digitrip RMS 810The Digitrip RMS 810 Trip Assembly is similar to the Digitrip RMS 610 Trip Assembly with the addition of a fourdigit display, three-phase (I A ,I B , I C ) and one ground current (l G ) or one neutral current (lD), green pointer LEDsalong with a stepping push button, peak demand, presentdemand and energy consumed green pointer LEDs alongwith a peak demand reset push button as illustrated inTable 1. The Digitrip RMS 810 Trip Unit is described inl.L. 29-888.The Trip Assembly provides for both local displays on theface of the trip unit and remote communications via anIMPACC communication network signal link as illustratedin Table 1.In addition, if desired, an Assemblies Electronic Monitor(AEM) as described in l.L. 17-216, may also be installedto show the parameters in Table 1 covered under Note 2.A communicating panel mounted device, the BreakerInterface Module (BIM), as described in l.L. 29C893 canbe used to display metering and other transmittable data.Interconnections for the IMPACC circuit must be connected as shown in l.L. 29-888 and wiring diagram usingtwisted pair (shielded) No. 18 AWG conductors.The three-digit IMPACC address must be set on each tripunit per instructions given in l.L. 29-888. To insure thateach circuit breaker in an assembly is properly locatedafter the address is set, the breaker should be identifiedwith its proper cell location and that reference along withthe breaker IMPACC address marked on the face of thetrip unit in the spaces provided.In addition to the communication of the breaker data, theIMPACC module allows for remote tripping (via the fluxshunt trip) and closing of the circuit breaker.EATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comInstruction Leaflet 29C713EEffective October 20104.5 Digitrip RMS 910The Digitrip RMS 910 Trip Assembly is similar to the Digitrip RMS 810. It is a communicating trip unit that provides all the functions described in Section 4.4 plus theaddition of the following features both locally displayedand remotely communicated:1.Phase-to-phase voltages - V AB, V BC , V CA2.System power factor - PF3.Total harmonic distortion THD for IA, I B , I CThe THD calculation also includes the individual harmonic currents up to the 27 harmonic as a percentage ofthe fundamental. Also included with the THD is provisions for waveform capture information via a host computer. Detailed information is provided in l.L. 29-889.4.6 Digitrip OPTIM 750The Digitrip OPTIM 750 is a programmable communicating microprocessor-based RMS current sensing trip unit.For the R-Frame breaker it is physically the same plug-intrip unit as all the other Digitrip models. There are twostyle offerings – Phase Protection with Ground Fault Trip(Cat. P76LSIG) and Phase Protection with Ground FaultAlarm (Cat. P77LSIA).The front panel of the unit has 3 or 4 causes of trip LEDsand a telephone type receptacle for purposes of programming settings, testing and displaying phase currentsvia a separate hand-held unit called the OPTIMizer.There are up to 10 trip functions that can be programmedwhich includes both a 1 2t and 1 4t curve for the Long-Timeslope. There are also typically ten times the number ofsetpoints compared to a front adjustable trip unit. Alltransmittable data as well as programming of the tripcurve settings can also be communicated over a twistedpair cable via the breaker's secondaries (terminals C11,C12) to either a host computer or a panel mountedBreaker Interface Module (BIM).The breaker includes a Power/Relay module per Fig. 5 toprovide power for the communications function and delayoutput for alarming.Detail information on Digitrip OPTIM trip units is inl.L. 29C891.4.7 Digitrip OPTIM 1050The Digitrip OPTIM 1050 is a programmable communicating microprocessor-based RMS current sensing tripunit. For the R-Frame breaker it is physically the samePage 8

Effective Date October 2010plug-in unit as all the other Digitrip models. There are twostyle offerings –Phase Protection with Ground Fault Trip(Cat. P106LSIG) and Phase Protection with Ground FaultAlarm (Cat. P107LSIA).The front panel of the unit has four cause of trip LEDsand a telephone type receptacle for programming settings, testing and displaying phase currents via a separate hand-held unit called the OPTIMizer. (TheOPTIMizer is used primarily for initial setup of an individual breaker.) There are up to ten trip functions thatcanbe programmed which includes both a I²t and a I4tcurve for the Long-Time Slope. There is also typically tentimes the number of setpoints compared to a front adjustable trip unit for each function.All transmittable data as well as programming of the tripcurve settings can also be communicated over a twistedpair wiring network via breaker's secondary terminalsC11, C12 to either a host computer or a panel mountedBreaker Interface Module (BIM).Harmonics information including total Harmonic Distortion, the individual harmonic currents involved up to the27th harmonic and waveform capture for the three phasecurrents and the neutral is accessible via communications.The Digitrip OPTIM 1050 will also provide Power andEnergy Monitoring functions via communications. Thebreaker requires the PT Module (Fig. 5) to provide thisfunctionality. Also included is a Power/Relay module toprovide power for communication functions and relay outputs for alarming.4.8 Reset OperationFollowing overload, short circuit, or ground fault trippingevents on Digitrip Types 610, 810, and 910, the Digitrip“Trip Reset" pushbutton must be depressed before thecircuit breaker handle can be reset (trip/reclose feature).The Digitrip RMS 310, 510 and Digitrip OPTIM 750 and1050 in R-frame do not require a trip reset push-buttonoperation to reset the breaker's mechanism. However, atrip reset push-button operation is required to clear causeof trip LED.Instruction Leaflet 29C713EEffective October 20101.The sensors which determine the current level.2.The Digitrip RMS Trip Unit, which provides a tripping signal to the Flux Shunt Trip when current andtime delay settings are exceeded.3.The flux shunt trip which actually trips the circuitbreaker.Schematically, this may be represented as illustrated inFig. 6. This arrangement provides a very flexible systemcovering a wide range of tripping characteristics. Not onlyis the Digitrip RMS Trip Unit adjustable, but selection ofrating plugs provides a wide range of continuous currentratings.The automatic overload and short circuit tripping characteristics for a specific circuit breaker are determined bythe ratings of the installed current sensors, rating plugsand the selected functional protection settings. Specificsettings instructions are provided in the applicable tripunit instruction leaflet referenced in Section 8.2 of thisinstruction book.When the functional protection settings are exceeded,the Digitrip RMS Trip Unit supplies a trip signal to the fluxshunt trip. Thus all tripping operations initiated by the protection functions of the Digitrip RMS Trip Unit are performed by secondary control circuitry, with no mechanicalor direct magnetic action between the primary currentand the mechanical tripping parts of the breaker and withno external control power required.5.2 Digitrip RMS Trip AssemblyThe basic Digitrip RMS Trip Assembly, as illustrated inFigs. 1, 2 and 4, includes the following which could varyslightly depending upon the exact model of the DigitripTrip Unit installed:1.Digitrip RMS or Digitrip OPTIM Trip Unit2.Rating Plug3.Auxiliary Current Transformers - 3 or 4 dependingupon whether or not ground fault or neutral protection is included. These are installed on backmounted PC board.4.Stab-in Terminal Block for Trip Unit5.Power/Relay module (Digitrip RMS Trip Unit Models 610, 810, 910 and Models 750 and 1050.)5.0 PRINCIPLE OF OPERATION5.1 GeneralThe circuit breaker is tripped automatically under faultcurrent conditions by the combined action of three components:EATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comPage 9

Effective Date October 2010Instruction Leaflet 29C713EEffective October 2010Table 1 – Digitrip RMS and Digitrip OPTIM Trip Unit Characteristics for R-FrameEATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comPage 10

Effective Date October 2010Fig. 5.6.Instruction Leaflet 29C713EEffective October 2010View of 1600 A Circuit Breaker with Front Cover and Digitrip RMS Trip Unit Removed to Expose Power RelayModule and Stab-In Terminal BlockPotential Transformer module with Dielectric TestDisconnect Plug (Digitrip RMS Trip Unit Models810, 910 and 1050 only)As shown in Figs. 1 and 4, the Digitrip RMS Trip Unitassembly mounts in the left-hand pole of an R-FrameCircuit Breaker.The R-Frame Circuit Breaker is factory wired inaccordance with the applicable pages of connection diagram l.L. 29C714. Any field installation or modificationmust be made in accordance with the applicable pages ofthis same document.CAUTIONIMPROPER POLARITY CONNECTIONS ON THE FLUXSHUNT TRIP COIL WILL VOID OVERLOAD ANDSHORT CIRCUIT PROTECTION WHICH COULDRESULT IN PERSONAL INJURY.OBSERVE POLARITY MARKINGS ON THE SHUNTTRIP LEADS AND CONNECT PROPERLY WITHINSTRUCTIONS PROVIDED SHOULD ANY CHANGESBE MADE.5.3 Flux Shunt TripThe mechanical force required to initiate the trippingaction of a type R-Frame is provided by a specialflux shunt trip. It is mounted, as shown in Fig. 4, onthe trip unit mounting deck. It contains a permanent magnet assembly, moving and stationary core assembliesalong with a spring and coil. The circuit breaker mechanism assembly contains a mechanism actuated resetEATON CORPORATION www.eaton.comCourtesy of NationalSwitchgear.comPage 11

lever and a rotating trip lever to actuate the tripping actionof the circuit breaker.5.4.3 Source Ground SensingWhen the Flux Shunt Trip is reset by the handle moved toreset position, the moving core assembly is held in readiness against the force of the compressed spring by thepermanent magnet. When a tripping action is initiated,the Flux Shunt Trip coil receives a tripping pulse from theDigi

3.0.2 Digitrip RMS 310- Plugs This family of plugs is illustrated in Fig. 3.1. This plug design will not mechanically t into the other Digitrip models. On the model 310 units the continous current rating (I. r) equals the rating plug ampere rating (l ). The Fig. 3.1 Typical Rating Plug for Digitrip RMS 310