Eaton Digitrip RMS 510 Instruction Leaflet

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

10Instruction Leaflet I. L. 29-885DEffective August 2011Instructions for Digitrip RMS 510 Trip UnitEATON CORPORATION www.eaton.com3 Protection Settings3.1 GeneralPrior to placing any circuit breaker in operation, each Trip Unit pro-tection setting must be set to the values specified by the personresponsible for the installation The number of settings that mustbe made is determined by the protection supplied as illustrated inFigures 11 through 18 Each setting is made with a rotary switch,using a small screwdriver The selected setting for each adjustmentappears in its respective rectangular viewing window as illustrated inFigure 2The installed rating plug establishes the maximum continuous cur-rent rating (In), up to, but not exceeding the Frame Rating of the cir-cuit breaker Instantaneous and ground current settings are definedin multiples of (In)To illustrate the effect of each protection curve setting, simulatedTime-Current curves are pictured on the face of the Trip Unit Therotary switch used to make each setting is located nearest thatportion of the simulated Time-Current curve it controls Should anautomatic "TRIP" occur (as a result of the current exceeding thepre-selected value), the LED in the appropriate segment of the simu-lated Time-Current curve will light "RED", indicating the reason forthe "TRIP"The available settings, along with the illustrated effect of changingthe settings are given in Figures 11 through 183.2 Long Delay Current SettingThere are eight (8) available Long Delay "Pick-up" Current Settings, asillustrated in Figure 11 Each setting, called " Ir”, is expressed as amultiple (ranging from 0 5 to 1) of the rating plug current (In)otee:N " Ir" is also the basis for the Short-Delay Current Setting (seeSection 3 4)Figure 11. Long Delay Current Settings.3.3 Long Delay Time SettingThere are eight (8) available Long Delay Time Settings, as illustratedin Figure 12, ranging from 2 to 24 seconds These settings are thetotal clearing times in seconds, when the current value equals six(6) times Ir The (LS) Time-Current Curve applicable for your circuitbreaker gives complete details (see Section 5)Figure 12. Long Delay Time Settings.Long Delay Available SettingsSetting .5, ,6, .7, .8,.85, .9, .95, 1In Multiples ofRating PlugAmperesI rI rI rI n(I )nI r., ,Available Settings12, 15, 20, 24I... Seconds at 6 Times, .. .. .6 xLongTimeDelaySec.at 6 x I rI r4(I )rLong Delay Setting2, 4, 7, 10,otee:N In addition to the standard Long Delay Protection Element, the DigitripRMS 510 Trip Unit also has a Long Time Memory (LTM) function, whichserves to protect load circuits from the effects of repeated overload condi-tions If a breaker is re-closed soon after a Long Delay Trip, and the currentagain exceeds the Long Delay Current Setting, Ir, the LTM automaticallyreduces the time to trip, to allow for the fact that the load circuit temperatureis already higher than normal, due to the prior overload condition Repeatedoverload can cause LTM to trip the breaker after a time delay less than the“Long Delay Time Setting” When the load current returns to normal, theLTM begins to reset; and after about 10 minutes it has reset fully, so thatnext Long Delay trip time will again be the "Setting" value To reset the LTMquickly, see Section 4 4, Item 3In certain applications it may be desirable to disable the LTM function TheLTM function can be disabled by (first opening the breaker and then) remov-ing the Rating Plug and lastly moving the LTM jumper (inside the rating plugcavity, see Figure 13) to its "INACTIVE" connection (You can enable the LTMfunction again any time you wish by moving the LTM jumper back to its origi-nal "ACTIVE" connection )The action of the LTM is a factor to consider in performing multiple LongDelay Time tests (See Section 4 4 )Figure 13. Long Time Memory "LTM" Jumper.otee:N There is a condition under which the Long Delay Trip LED can errone-ously indicate a LDT has occurred, even though the breaker is still closedThis can happen when an overload current momentarily exceeds the LongDelay Current Setting, Ir, so that the Long Delay LED flashes "RED" to indicatethe overload condition Then if, at the very moment when the LED is "ON",the load current would then suddenly drop to a value less than 10% of thebreaker frame (or current sensor) rating, the trip unit stops functioning whilethe "4bit Latch Chip" (See Fig 1) is set and the LED remains lit If the currentwould again increase to a value above the Long Delay Current Setting, I,, andthen return to normal, the LDT will reset itself You can of course, manuallyclear the LDT (or any other trip indication) at any time, by pushing the "PUSHto RESET" button (See Figure 2 )3.4 Short Delay Current SettingThere are eight (8) available Short Delay "Pick-up" Current Settings,as illustrated in Figure 14 Six settings are in the range from 2to 6 times Ir and the other two settings are "S1" or "S2" times Ir(REMEMBER: Ir is the Long Delay Current Setting) The values that"S1" and "S2" have depend upon the type of circuit breaker, and arespecified both on the rating plug label (see Figure 9) and on theapplicable (LS) Time-Current Curve referenced in Section 5Figure 14. Short Delay Current Settings.Rating Plug CavityLTM Active. .S1 and S22, 2.5, 3, 4Available Settings. ..SettingIn Multiples ofLong Delay SettingValues are Specified on Rating Plug5, 6, S , S1 2I r(I )r