Eaton Digitrip RMS 910 Instruction Leaflet
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Eaton Digitrip RMS 910 Instruction Leaflet

Trip unit
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Effective June 2011
Instruction Leaflet I. L. 29-889B
Supersedes I.L. 29-889A 5/97
Instructions for Digitrip RMS 910 Trip Unit

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Summary of Contents for Eaton Digitrip RMS 910

  • Page 1 Effective June 2011 Instruction Leaflet I. L. 29-889B Supersedes I.L. 29-889A 5/97 Instructions for Digitrip RMS 910 Trip Unit...

  • Page 2: Table Of Contents

    1 .1 Basic Digitrip RMS 910 Trip Unit . . . . . . . . . . . . . . . .
  • Page 3 Table 1 . Digitrip RMS 910 Protection Functions . . . . . . . . . . . . . . . . .

  • Page 4: Important Safety Instructions

    1.1 Basic Digitrip RMS 910 Trip Unit DO NOT ATTEMPT TO INSTALL OR PERFORM MAINTENANCE ON The Digitrip RMS 910, illustrated in Figure 1, is a Trip Unit suitable EQUIPMENT WHILE IT IS ENERGIZED. DEATH OR SEVERE PERSONAL for use in types DS and DSL Low-Voltage AC power circuit breakers INJURY CAN RESULT FROM CONTACT WITH ENERGIZED EQUIPMENT.

  • Page 5: Operational Status And Protection Trip Indicators

    (see Section 1 .4) will maintain the LED "RED" and will continue to send a TRIP signal to LOCKOUT the circuit breaker until the Trip Unit is RESET. The Digitrip RMS 910 Trip Unit can be RESET in two ways: Either press and release the "TRIP RESET"...

  • Page 6: General Over-Current Protection

    Section 4 .5 . grally mounted in the circuit breaker . The Digitrip RMS 910 Trip Unit is available in six different types . otee: The Digitrip RMS 910 performs all of its protection functions regardless of the status of the battery .
  • Page 7 Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 Table 1. Digitrip RMS 910 Protection Functions. Trip Unit Type RMS Digitrip 910 Catalog Number Refer to I.L. Section Number Suffix Number 91 92 93 94 95 96 Instruction Leaflet No.

  • Page 8: Figure 3. Digitrip Rms 910 Type Ll

    Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 Figure 5. Digitrip RMS 910 Type LSI. Figure 3. Digitrip RMS 910 Type Ll. Figure 4. Digitrip RMS 910 Type LS. Figure 6. Digitrip RMS 910 Type LIG.

  • Page 9: Discriminator (High Initial Current Release)

    1.1.3 Discriminator (High Initial Current Release) (For Types LS and LSG Trip Units Only) When the Digitrip RMS 910 Trip Unit is not equipped with an adjustable instantaneous protection setting, i .e . types LS or LSG, a DlScriminator circuit (or high initial current release) is provided . The...

  • Page 10: Override (Fixed Instantaneous)

    1.2.1 Values Displayed During Normal Service 1.1.4 OVERRIDE (Fixed Instantaneous) Each Digitrip RMS 910 Trip Unit has a Fixed Instantaneous "Override" The alpha-numeric display window provides informational values analog trip circuit pre-set to a value no greater than the short-time...
  • Page 11 Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 Table 2. Digitrip RMS 910 Information Functions. Trip Unit Type RMS Digitrip 910 Catalog Number Refer to I.L. Section Number Suffix Number 91 92 93 94 95 96 Instruction Leaflet No.

  • Page 12: Instrumentation - Voltage Values

    Range: 100 to 600 Vac RMS - 3 Phase; and Accuracy: ± 2% of Full Range Volts . Table 3. Digitrip RMS 910 Trip Unit Message Codes and their Meanings. Message Meaning comment Sec, DISC...

  • Page 13: Instrumentation - Power, Power Factor And Energy

    ® R-Frame or Type SPB circuit breakers, The Digitrip RMS 910 Trip Unit displays power and energy values . By using the circuit breaker current sensors and an integrally mounted ± 4% of (Current Sensor Rating x 600 V) for Type Potential Transformer Module shown in Figure 11, power and energy DS circuit breakers .

  • Page 14: Harmonics [Thd]

    . If the 120 Vac control power is lost and then is restored, the Energy value is also restored . The Digitrip RMS 910 Trip Unit presumes that power is flowing into the "top" and out of the bottom of the circuit breaker (positive flow of power) .

  • Page 15: Rom Error

    . The scrolling message will not remain in the win- Rating Plugs for the Digitrip RMS 910 Trip Units are marked for, and dow constantly but is repeated periodically to remind you to replace may be applied on both 50 and 60 Hz systems .

  • Page 16: Potential Transformer Module

    As indicated in Figures 2 and 9, a back-up battery is provided to tings . maintain the mode of trip LED indication in the Digitrip RMS 910 Trip Unit when external control power to the Power / Relay module is not For Type LSG, LIG, and LSIG Trip Units, the Ground Fault Trip Alarm available .

  • Page 17: Auxiliary Power Module

    Power / Relay Module (see Section 1 .4) . When a drawout circuit breaker is equipped with a Digitrip RMS 910 Trip Unit, it can be con- veniently set and tested while the circuit breaker is either out of its cell or in its cell in the "Test", "Disconnect", or "Withdrawn"...

  • Page 18: Protection Settings

    Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 3 protection Settings 3.3 Long Delay Time Setting There are eight (8) available Long Delay Time Settings, as illustrated 3.1 General in Figure 14, ranging from 2 to 24 seconds . These settings are the...

  • Page 19: No Instantaneous Current Setting

    Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 4 test procedures 3.7 No Instantaneous Current Setting For types LS and LSG Trip Units, please see Sections 1 .1 .3 4.1 General DlScriminator (High initial Current Release) and 1 .1 .4 OVERRIDE (Fixed Instantaneous), for available fast-acting high short-circuit pro- DANGER...

  • Page 20: Testing Provisions

    Trip Unit. resets quickly, it will not normally affect ground fault test results, Since the Digitrip RMS 910 Trip Unit is designed to run with control but if Ground Fault tests are repeated quickly, the GTM can power from the Power / Relay Module for the display window and make the breaker appear to trip too soon .

  • Page 21: Not Tripping The Breaker

    The battery has no part in the protection function of the Trip Unit . The battery is provided only to maintain the "RED" LED indication of the cause of TRIP in the Digitrip RMS 910 Trip Unit, when external control power to the Power / Relay Module is not available . The battery is located in the rating plug along with a battery check push- button and a green battery check LED (see Figure 9) .

  • Page 22: Communications

    Instruction Leaflet I. L. 29-889B Effective June 2011 5 communications One of the most important functions of the Digitrip RMS 910 Trip Unit is its ability to communicate both information and con- trol signals via the Eaton proprietary INtegrated COMmunications (INCOM ) Local Area Network (LAN) .

  • Page 23: Figure 22. Incom Network With Aem / Bim

    Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 Breaker Interface Twisted Pair. Monitor (BIM)  Cut-off Shield at  Device Do N o t Ground  Circuit  Breaker  RMS 800 See Section Trip Unit Note: OK t o m i x Models 700, 800, and 810 Trip Units i f Baud Rate L = 1200 is used.

  • Page 24: Trip Unit Address And Baud Rate

    ® ues into the Trip Unit's non-volatile memory, and the kA, MW or cuit breaker individually, the Digitrip RMS 910 Trip Unit has a unique MWh value will return to the display window . If control power is 3-digit "ADDRESS", which INCOM uses to identify the Trip Unit and ®...
  • Page 25 Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 Table 5. Digitrip RMS 910 Protection Functions. Trip Unit Type RMS Digitrip 910 Catalog Number Refer to I.L. Section Number Suffix Number 91 92 93 94 95 96 Instruction Leaflet No.

  • Page 26: Remote Master Computer

    (see Section 6) for more information . The information information from any of the Digitrip RMS 910 Trip Units . The connec- available through INCOM is actually greater than that available local- ®...

  • Page 27: Remote Resetting Of The Trip Unit

    Instructions for Low-Voltage Power Circuit Breakers Types DS ll and DSL ll BECAUSE THE AUTOMATIC LOCKOUT-AFTER-TRIP FEATURE OF THE DIGITRIP RMS 910 TRIP UNIT MAINTAINS THE CIRCUIT BREAKER IN A Supplemental Digitrip RMS and Optim Trip Units with Type DS ll "TRIP-FREE"...

  • Page 28: Series C ® R-Frame Molded Case Circuit Breakers

    Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 appenDiX a: Zone lnterlocking 6.5 Series C R-Frame Molded Case Circuit Breakers ® 29C106 Frame Book Assume a ground fault of 2000 Amperes occurs and refer to Figure A .1 .

  • Page 29: Appendix B: Interpreting Display Codes After Circuit Breaker

    Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 appenDiX B: interpreting Display codes after circuit Breaker trips 3200 A M a i n Given a 1600 A frame circuit breaker with an I = 1000 A rating plug installed.
  • Page 30 Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 The "HILD" message would begin to flash in the window when • the overload condition had exceeded 0 .85 x I for 40 seconds or longer . To clear the "HILD" message and to view the present magnitudes of the currents, press and release the (Black) "STEP"...
  • Page 31 Instructions for Digitrip RMS 910 Trip Unit Instruction Leaflet I. L. 29-889B Effective June 2011 Notese: eaton corporation www.eaton.com...
  • Page 32 OF DEALING OR USAGE OF TRADE, ARE MADE REGARDING THE INFORMATION, RECOMMENDATIONS, AND DESCRIPTIONS CONTAINED HEREIN. In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or otherwise for any special, indirect, incidental or consequential damage or loss...

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