Eaton Digitrip RMS 510 Instruction Leaflet

Also see for Cutler-Hammer Digitrip RMS 510: Instructions Instructional Leaflet Instructions

13Instruction Leaflet I. L. 29-885DEffective August 2011Instructions for Digitrip RMS 510 Trip UnitEATON CORPORATION www.eaton.comFigure 19. Integral Test Panel (Lower Right Corner of Trip Unit).4.4 Conducting TestsTo preserve the primary protection function of the Trip Unit, all in-ser-vice testing whether under "Trip" or "No-Trip" conditions is executedONLY if load current values are no greater than 50% x Ir (Ir = theLong Delay Current Setting) Any attempt to conduct in-servicetesting when the load current exceeds 50% of Ir, will NOT beexecuted by the Trip Unit.Since the Digitrip RMS 510 Trip Unit is completely self-poweredusing energy derived from the current sensors installed in the circuitbreaker, all in-service tests conducted should be conducted with theauxiliary control power module, shown in Fig 10, plugged into thetrip unit This action will avoid difficulties caused by load current lev-els that are too low to operate the trip unit1. Before starting any test sequence, check the Unit Status(Green LED) in the lower right corner of the Trip Unit (see Figures2 and 19) to be sure it is blinking on and off about once each sec-ond, which indicates that the Trip Unit is functioning normally. Inthe event the Unit Status LED is not blinking, install an AuxiliaryPower Module (APM) (see Figure 10), or if you have alreadyinstalled one, check to see that it is connected correctly (seeSection 1 3)2. If the circuit breaker is carrying current, check that the currentis not:a more than 50% of the Long Delay Current Setting (Ir);because the Trip Unit will not execute your test instructionswhen it senses that the current through the breaker exceedsthe 50% level If the current through the circuit breakerincreases to a value greater than 50% of the Long DelayCurrent Setting, Ir, the Trip Unit will automatically abort anyTrip Unit Test that may be in progress Should an actualoverload or fault condition occur during an in-service, testsequence, the protection function will override the test func-tion, and the circuit breaker will trip automatically in accor-dance with the actual Time-Current settingsb the current is not less than 10% of the breaker frame (orcurrent sensor) rating; be sure the "GREEN" Unit Status LED(in the lower right corner of the trip unit (See Figs 2 and 19)is blinking on and off (indicating that there is enough currentflowing to provide the power necessary to operate the tripunit) In the event the Unit Status LED is either lit "GREEN"or "OFF" continuously, there is NOT enough current flowingto power the trip unit; and an APM (See Fig 10) should beinstalled before proceeding with the testAvailable " Test A m p s " SettingsBreaker Tripsat 6T and GFT “6T” = Phase Current Test atand TRIPS breaker;Test A m p s " 1, 2, 3, 8 or 10 " x PhaseCurrent Test NO breakerTRIP;" GFT " = Ground Current Testand TRIPS breaker;" GF " = Ground Current TestTest NO breaker TRIP.See Section 4.4.2 for inser-Trip vice test t r i p limitations.ResetPush, then release Trip Resetb u t t o n t o reset Trip Unit.UnitStatus Required following all automatictrip and test operations.Push, then releasebutton to test. Test operationbegins w i t h release ofpushbutton 6xI nI n3. When performing tests on the Long Delay element, be awarethat in addition to the standard protection element, theDigitrip RMS 510 Trip Unit also has a Long Time Memoryfunction (LTM), which serves to protect load circuits fromthe effects of repeated overload conditions (see Note 1 underSection 3 3 Long Delay Time Setting) The action of the LTMduring primary injection tests and during tests initiated from theTrip Unit Test Panel under the "TEST AMPS" setting of "6T", willadvance the Long Delay Trip Time if multiple Long Delay Timetests are performed repeatedly - as one might do in makingsingle-phase tests on each pole of a breaker in succession, forexample If there is any question, you may simply wait aboutten (10) minutes after a Long Delay Trip for the LTM to resetThe LTM is not active during tests initiated from the Trip Unit TestPanel under the "TEST AMPS" settings of "1", "2", "3", "8", or "10"To reset the LTM immediately:• Set the "TEST AMPS" to "1"• Press and release the (Black) "TEST" push-button (timer will berunning in the display window), and then• Quickly press and release the "TRIP RESET" push-buttonbefore the Trip Unit operates• Now the LTM will be reset4.4.1 Control PowerFor testing the trip unit, an optional Auxiliary Power Module (CatNo PRTAAPM) as shown in Fig 7 is recommended This AuxiliaryPower Module, which operates from a separate 120 Vac supply, maybe used when a drawout circuit breaker is in any of its four cell posi-tions, i e , "Connected", "Test", "Disconnected" and "Withdrawn" (or"Removed ")otee:N For Testing Purposes Only: When using an external single phase currentsource to test low level ground fault current settings, it is advisable to usethe Auxiliary Power Module (APM) (See Fig 10) Especially when the singlephase current is low, without the APM it may appear as if the trip unit doesnot respond until the current is well-above the set value, leading the tester tobelieve there is an error in the trip unit when there is none The reason thisoccurs is that the single phase test current is not a good simulation of thenormal three phase circuit If three phase current had been flowing, the tripunit would actually have performed correctly Use the APM for correct trip unitperformance whenever single phase tests are madePlug in the Auxiliary Power Module (Cat No PRTAAPM) to insurecontrol power is available for testing When the APM is properly con-nected the "GREEN" Unit Status LED will blink on and off about onceper second4.4.2 Not Tripping the Breaker1 Place the "TEST AMPS" selector switch (see Figure 19) in one ofthe six "No Trip" test settings, i e , 1, 2, 3, 8, or 10 x In, or GF2 Press and release the (Black) "TEST" push-button - the test startswhen the push-button is released When the timer stops, the lit"RED" cause of trip LED indicates the protection function whichoperated3 Should any of the various protection settings be less than theselected "No Trip" test value, then the LED related to that func-tion will turn on signifying successful completion of the testactionotee:N During the long delay tests the Long Delay LED flashes "RED"4 Reset the Trip Unit by pressing and releasing the "TRIP RESET"push-button; all LEDs lit by the "No Trip" test action should turn"OFF In the event that no one resets the Trip Unit after a test, itwill wait for about three (3) hours, and then it will automaticallyrevert back to its pretest statusShould an actual overload or fault condition occur during an in-ser-vice, "No Trip Test" sequence, the protection function will override thetest function, and the circut breaker will trip automatically in accor-dance with the actual Time-Current settings