Eaton Cutler-Hammer RMS 510 Instructions Manual

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

I.L. 29-885B Page 5[ LINE / UPPER )r «r~s Flux Transfer Shunt Trip (FTST)T ) °rJL/ Direct Trip Actuator IDTA)Input Protection Function SettingBy Switches and PushbuttonsSee Section 4.IJL JL JLt t t> > >•i AnalogOverrideTrip CircuitSee Section 3.5.FETI It Lighted RED,Indicates CauseOf TRIP [ LocatedOn Front Panel)See Section 1.2.J A Trip UnitOperatingIndicator (FlashingGREEN Indicates OK)See Section 3.2.StatusIntegralTest PanelSee Section 5.S3 «4 I4bitCurrentSensorsSee Section 8.r*i4*HalU-ruOLatchBridgeCircuitsAuxCTs Chip/Push Button,Lights GREENIf Battery OKSee SectiFInternalPowerSupply"Custom Designed-L+BatteryOI<14 on 6.\&\£ [> Raring Plug^ 1 Section 8.\)/ VT T T T * \ Integrated CircuitRatingPlugConnectorsZoneInterlockCircuitrySection( LOAD / LOWER I Typical PhaseOr Ground ASp.RE+ ChipT IN _»~7—WCalibrationResistor3.6.Auxilia(When ry Power ModuUsed) See Secjle Inputtion 7. OUTS7Digitrip RMS 510 Block Diagram with Breaker InterfaceFig. 3The microcomputer, in cyclic fashion, repeatedly scansthe voltage values across each calibrating resistor andenters these values into its Random Access Memory(RAM). These data are used to calculate true RMS cur-rent values, which are then repeatedly compared with theprotection function settings and other operating datastored in the Read Only Memory (ROM). The softwareprogram then determines whether to initiate protectionfunctions, including tripping the breaker through the lowenergy trip device (Flux Transfer Shunt Trip or Direct TripActuator) in the circuit breaker.3.3 Test Provisions (See Section 5.0)3.4 Discriminator (Making Current Release)(For Types LS and LSG trip units only.)When the Digitrip RMS 510 Trip Unit is not equipped withan adjustable instantaneous protection setting, i.e., typesLS or LSG, a making current release (or Discriminator)circuit is provided. This circuit will prevent the circuitbreaker from being closed and latched-in on a faulted cir-cuit. The non-adjustable release is pre-set at eleven (11)times the installed rating plug current (ln).The making current release is enabled only for the firstten (10) cycles following an initial circuit breaker closingoperation, provided the load current exceeds approxi-mately 10% of the circuit breaker frame (or current sen-sor) rating. Should the load current through the circuitbreaker drop to less than the 10% value, the release willreset. The release, once reset, will remain enabled untilthe load current passing through the circuit breaker hasexceeded the 10% value for 10 cycles. The making cur-rent release will trip the circuit breaker instantaneously.In the event the breaker is intended to close (but not totrip out again) into a circuit whose current could initiallybe higher than 11 x ln, it is possible to make the Discrim-inator inactive. If the breaker does close onto a fully ratedfault current, when the Discriminator is inactive, thebreaker will wait for the full short-time delay settingbefore it trips. The Discriminator (making currentrelease) can be made inactive by turning the “OVER-RIDE/” setting switch (nearest the bottom edge of the tripunit) from the “DIS” position, to the “ [ BLANK]” position.(See Figs. 2.2 and 2.5.)3.2 Trip and Operation IndicatorsThe LEDs, shown in Figs. 1 and 2.1-2.6, on the face ofthe trip unit, light “RED” to indicate the reason for anyautomatic trip operation. As indicated in Figs. 2.1-2.6,each LED is strategically located in the related segmentof the time-current curve depicted on the face of the tripunit. The reason for trip is identified by the segment of thetime-current curve where the LED is lighted “RED”. Fol-lowing an automatic trip operation, the back-up battery,continues to supply power to the LEDs as indicated inFigs. 3 and 6. To check the status of the battery, seeSection 6.Push the “Trip Reset” button shown in Fig. 1, to turn “Off’the LEDs following a trip operation.A green colored LED, as shown in Fig. 1, indicates theoperational status of the trip unit. Once the load currentthrough the circuit breaker exceeds approximately 10%of the frame/current sensor rating, the green LED willflash “On” and “Off’ once each second, to indicate the tripunit is energized and operating properly.Note: If the LED is steadily “GREEN”, i.e. not flash-ing, the trip unit is not ready.FAT'NEffective May 1997