Eaton Digitrip RMS Series Instructional Leaflet

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

is overcurrent protection, which is achieved by analyzingthe current signals received from the circuit breaker currentsensors and initiating trip signals to the circuit breaker tripactuator when pre-determined current levels and time delaysettings are exceeded.The protection section of the Digitrip RMS Trip Unit canbe equipped with up to five phase and two ground faulttime current adjustments. The short delay and ground faultpick-up adjustments can be arranged for either a flat or I2tresponse. The exact selection of the available adjustmentsmust be chosen to satisfy the protection needs of the spe-cific installation.LEDs provide mode of trip indication for ground fault, over-load and short circuit trip operations.Digitrip RMS Trip Unit types LS and LSG are not equippedwith an adjustable instantaneous trip element, but areprovided with a making current release (discriminator). Ahigh-level instantaneous override circuit is provided to insurerapid circuit clearing under abnormal fault current conditions.Digitrip RMS Trip Units are available in four basic models,the Digitrip RMS 510, 610, 810 and 910 (Figure 2a). Sepa-rate instruction leaflets referenced in Section 8.1 cover thefeatures and functions of each model. This instruction bookis arranged to describe the unique features of each type asapplied in Types DSII and DSLII Low-Voltage AC Power Cir-cuit Breakers. Table 1 presents the available characteristicsof each of the four trip unit models.The Digitrip OPTIM Trip Unit System utilizes two basic tripunit models with the Type DSII Low Voltage AC Power CircuitBreaker, the OPTIM 750 and OPTIM 1050 Trip Units (Figure2b). The featured parts of a Digitrip OPTIM Trip Unit Systemare:1. OPTIM 750 or 1050 RMS sensing trip units2. OPTIMizer Hand Held Programmer3. Breaker Interface ModuleThe OPTIMizer Hand Held Programmer plugs into the frontof OPTIM 750 or 1050 Trip Units to access, display and con-figure trip unit information, and establish trip unit addresses.The panel mounted Breaker Interface Module provides allthe same features and capabilities as the OPTIMizer HandHeld Programmer, plus energy monitoring, local/remote indi-cation, and communications capabilities, except that only theHand Held Programmer can establish trip unit addresses.Separate instruction manuals, referenced in Section 8.3,cover all the details associated with the OPTIMizer HandHeld Programmer and the Breaker Interface Module.The following circuit breaker accessories are available to pro-vide supplementary protection, signaling and test functions:(Refer to Section 3.10 of I.B. 694C694 for details)1. Undervoltage Trip Device2. Portable Test Kit - See CAUTION on page 4.3. Latch Check Switch4. Auxiliary Switches5. Overcurrent Trip Switch3.0 Ratings PlugsRating Plugs, as shown in Figure 3, determine the continu-ous current rating of the circuit breaker. All protection func-tion settings on the face of the trip unit for the Digitrip RMS510, 610, 810 and 910 are expressed in per unit multiplesof the plug rating (In) or the long delay current setting (Ir).The Digitrip OPTIM 750 and 1050 use the same rating plugfamily as Digitrip RMS. The plug rating (In) determines themaximum continuous current rating of the circuit breaker. Allthe protection function pickup settings are based on the plugrating (In). These pickup settings are ultimately loaded intothe trip unit in per unit, but are displayed as an ampere valuefor ease of use by the user.Available rating plugs are shown in Table 2. Plugs are suitablefor 50 or 60Hz operation, but must be selected to match thedesired continuous current rating of the circuit breaker aswell as the installed sensor rating.Rating plugs are equipped with a back-up battery, as shownin Figure 3, to maintain the trip indication following a circuitbreaker tripping operation when external control power isnot available. The battery is a long-life lithium type that isreplaceable from the front of the trip unit without remov-ing the rating plug. Replacement types and instructions areprovided in the Digitrip RMS Trip Unit instruction leafletsreferred to in Section 8.1.Following a trip operation and with no supplementary controlpower available, the battery would maintain the mode of tripLED for approximately 60 hours.Effective July 2010Instructional Leaflet IL8700C39-043eaTOn CORPORaTIOn www.eaton.com