Eaton Digitrip RMS Series Instructional Leaflet

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

Effective July 2010 Instructional Leaflet IL8700C39-04Installed pick-up (Dial) settingrating amperes jplugamperes ak Bk Ck Dk Ek f h k(In)100 25 30 35 40 50 60 75 100200 50 60 70 80 100 120 150 200250 63 75 88 100 125 150 188 250300 75 90 105 120 150 180 225 300400 100 120 140 160 200 240 300 400600 150 180 210 240 300 360 450 600800 200 240 280 320 400 480 600 8001000 250 300 350 400 500 600 750 10001200 300 360 420 480 600 720 900 12001600 400 480 560 640 800 960 1200 12002000 500 600 700 800 1000 1200 1200 12002400 600 720 840 960 1200 1200 1200 12003200 800 960 1120 1200 1200 1200 1200 12004000 1000 1200 1200 1200 1200 1200 1200 12005000 1200 1200 1200 1200 1200 1200 1200 1200j Except as noted, tolerances on pick-up levels are ±10% of valuesshown in chart.k Ground fault pick-up levels shown are nominal values whentested with external control power present. Without external con-trol power, such as is the case with the Digitrip RMS 510, groundpick-up levels may exceed these values and be as high as thevalue shown for the “E” setting of that particular rating plug.l Not applicable to Digitrip OPTIM. The ground fault pick-up settingis read directly from Digitrip OPTIM. These settings range from25% to 100% of the rating plug value up to a maximum NEClimitation of 1200 amperes.Depending upon the installation requirements, alternateground fault sensing schemes may be employed. Twopopular methods include: Ground return and zero sequence.Either method can be employed with the Digitrip Trip Unit.For either type application, a ring type current sensor, as il-lustrated in Figure 7, is normally employed. For ground returnsensing, the sensor is arranged to have the system “mainbonding jumper” pass directly through the sensor. For zerosequence sensing methods, all phase and neutral conduc-tors must pass through the sensor.Where multi-conductor cables are required for a particularcircuit and the window opening in a single BYZ sensor is toosmall to accommodate all cables, separate BYZ sensors maybe installed on each set of cables(3 phase, neutral) and the secondaries connected in paral-lel. (Note: Proper polarity markings must be observed.) Theresultant secondary current signal will be equivalent to asingle BYZ sensor.The BYZ current sensor styles shown in Figure 7 are avail-able for all previously mentioned applications. When eitherstyle sensor is used, the ground fault values shown in Table3 are not applicable and the values shown in Table 4 shouldbe used. One of the reasons for using the BYZ currentsensors is to improve the level of sensitivity. This being thecase, then the ground fault functional pick-up setting shouldbe placed on position “A.” The sensitivity of the ground ele-ment for this kind of arrangement will depend upon the ratioof the BYZ sensor used.A variety of utilization schemes are available utilizing each ofthe above methods of ground fault sensing. Therefore, theindividual installation requirements must be closely studiedto insure proper application.5.5 Current SensorsThe three current sensors installed in the circuit breaker arelocated at the rear of the circuit breaker on the lower studs.The location is shown in Figure 3-1 of l.B. 694C694. Theyproduce an output signal proportional to the load currentand furnish the Digitrip Trip Assembly with the intelligenceand energy to trip the circuit breaker when the time-currentconditions exceed the functional protection settings.The continuous current rating for any frame size breaker canbe changed by changing the rating plug. A complete tabula-tion of available current sensors and rating plugs is given inratings sensor ratings - amperesplugamps 200 300 400 600 800 1200 1600 2000 2400 3200 4000 5000100 6.3200 12.5 8.3 6.3250 10.4 7.8300 12.5 9.4 6.3400 12.5 8.3 6.3600 12.5 9.4 6.3800 12.5 8.3 6.31000 10.4 7.8 6.31200 12.5 9.4 7.5 6.31600 12.5 10 8.3 6.32000 12.5 10.4 7.8 6.32400 12.5 9.4 7.53200 12.5 10 8.04000 12.5 10.05000 12.5j Except as noted, tolerances on pick-up levels are ±10% of valuesshown in chart.k Ground fault pick-up levels shown are nominal values whentested with external control power present. Without externalcontrol power such as is the case with the Digitrip RMS 510 tripunit, ground pick-up levels can vary between the minimum andmaximum values shown for each sensor rating.l For BYZ (100/5) sensor, multiply above values by two.14 eaTOn CORPORaTIOn www.eaton.comTable 3 Ground Current Pick-up Settings l Table 4 Approximate Ground Fault Pick-up Amperes Using BYZ(50/5) Sensor and “A” Position Setting on Ground Fault Pick-upj k l