Eaton Cutler-Hammer RMS 510 Instructions Manual

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

I.L. 29-885BPage 8LDT will reset itself. You can of course, manuallyclear the LDT (or any other trip indication) at anytime, by pushing the “PUSH to RESET” button.(See Figure 1.)range from 2 to 6 times (ln) the rating plug value, and theother two settings are “M1” or “M2” times (ln). The valuesthat “M1” and “M2” have depend upon the type of circuitbreaker, and are specified both on the rating plug label(see Fig. 6), and on the applicable Time-Current Curvesreferenced in Section 9.0.4.4 Short Delay Current SettingThere are eight (8) available Short Delay Current Set-tings, as illustrated in Fig. 4.3. Six settings are in therange from 2 to 6 times lr and the other two settings are“S1” or “S2” times lr . (REMEMBER: lr is the Long DelayCurrent Setting). The values that “S1” and “S2” havedepend upon the type of circuit breaker, and are speci-fied both on the rating plug label (see Fig. 6), and on theapplicable Time-Current Curves referenced inSection 9.0.4.7 NO Instantaneous Current SettingFor types LS and LSG trip units, please see Sections 3.4Discriminator (Making Current Release) and 3.5 OVER-RIDE (Fixed Instantaneous), for available fast-acting highshort-circuit protection.4.8 Ground Fault Current SettingThe eight (8) Ground Fault Current Settings are labeledwith the code letters “A” through “K” (except there are no“G” or “I” settings), as illustrated in Fig. 4.6. In general,the specific current settings range from 0.25 to 1.0 times(ln), the rating plug value, but cannot exceed 1200 A. Thespecific Ground Current Settings for each letter are listedin Table 1 and on the applicable Time-Current curve forthe breaker.4.5 Short Delay Time SettingAs illustrated in Fig. 4.4, there are two different ShortDelay curve shapes, i.e. , fixed time (flat) or l2t response.The shape selected depends on the type of selectivecoordination chosen. The l2t response will provide alonger time delay in the low-end of the short delay currentrange than will the flat response.[ i\i. APl \NAvailable Settings Sho.* DelayTimeI i 0Sec.0-1n2, 2.5,3. 4,5, 6,S,, S2In Multiples ofLong Delay SettingShort DelaySetting[I] r-lrl1PL.*1_ *O r ) PSt— — i— — — — J Availabi 'SettingsISt and S2 Values are Specified on Rating Plug 1, .2. .3, .* .5m l"} • iLIT: Seconds wi hFlat Respom eFig. 4.3 Short Delay Current SettingsFive flat (.1, .2, .3, .4, .5 sec.) and three l2t (.1*, .3*, .5*sec.) response time delay settings are available. The l2tresponse settings are identified by the suffix asterisk (*)that appears in the viewing window. The l2t response isapplicable to currents less than eight (8) times lr , theLong Delay Setting. For currents greater than 8 times lnthe l2t response reverts to the flat response.Note: See also Section 3.6, Zone Interlocking, above.l2t ShapeReturns to FlatResponse at Currc itsHigher than 8 x /rr~i .1*, .3*,.5*' IL>J Seconds withl2t Shape"*"ln Viewing WindowIndicateslzt Shape8 x /r4.6 Instantaneous Current SettingThere are eight (8) available Instantaneous Current Set-tings, as illustrated in Fig. 4.5. Six settings are in theFig. 4.4 Short Delay Time SettingsEffective May 1997