microversatrip plus and microversatrip pm trip unitstrip unitstatusdisplayforlong-time overcurrent...

GEH-5891A

MicroVersaTrip® Plus andMicroVersaTrip® PM Trip Units

for Type AKR Low-Voltage Power Circuit BreakersPower Break ® Insulated-Case Circuit BreakersR-Frame Molded-Case Circuit Breakers

User's Manual

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www.nationalswitchgear.com

Courtesy of NationalSwitchgear.com

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WARNINGS, CAUTIONS, AND NOTESAS USED IN THIS PUBLICATION

WARNINGSWarning notices are used in this publication to emphasize that hazardous voltages, cur-rents, or other conditions that could cause personal injur)' exist in this equipment or maybe associated with its use.Warning notices are also used for situations in which inattention or lack of equipmentknowledge could cause either personal injuiy or damage to equipment.

CAUTIONSCaution notices are used for situations in which equipment might be damaged if care isnot taken.

NOTES(••fV)V Notes call attention to information that is especially significant to understanding andoperating the equipment.This document is based on information available at the time of its publication. Whileefforts have been made to ensure accuracy, the information contained herein does notcover all details or variations in hardware and software, nor does it provide for every pos-sible contingency in connection with installation, operation, and maintenance. Featuresmay be described herein that are not present in all hardware and software systems. GEElectrical Distribution 8c Control assumes no obligation of notice to holders of this docu-ment with respect to changes subsequently made.GE Electrical Distribution 8c Control makes no representation or warranty, expressed,implied, or statutory, with respect to, and assumes no responsibility for the accuracy,completeness, sufficiency, or usefulness of the information contained herein. No warran-tees of merchantability or fitness for purpose shall apply.

The following are trademarks of GE Company:

MicroVersaTrip® Plus, MicroVersaTrip® PM, Power Break®, Spectra RMS , Epic .

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©Copyright 1993 GE CompanyAll Rights Reserved

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MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsTable of ContentsChapter 1. Introduction

1-1 Read This First1-2 Product Structure1-3 Trip Unit Functions1-4 Trip Unit Catalog Numbers1-5 Rating Plugs1-6 Equipment Interfaces

MicroVersaTrip Plus Trip Units............Neutral Current SensorsMicroVersaTrip PM Trip UnitsPOWER LEADER Communication NetworkVoltage InputsPower Requirements

1-7 Trip Unit InformationTrip Unit Label InformationFunction KeysLiquid Crystal Display

1-8 MicroVersaTrip Plus and MicroVersaTrip PM Accuracies

11223334444555566

Chapter 2. Setup Mode72-1 Overview

2-2 Operating Modes2-3Setup Mode Operation

Long-Time PickupLong-Time DelayShort-Time PickupShort-Time DelayInstantaneous PickupHigh-Range Instantaneous Overcurrent ProtectionGround-Fault PickupGround-Fault DelayVoltage-Unbalance Relay PickupVoltage-Unbalance Relay DelayCurrent-Unbalance Relay PickupCurrent-Unbalance Relay DelayUndervoltage Relay PickupUndervoltage Relay DelayOvervoltage Relay PickupOvervoltage Relay DelayPower-Reversal Relay PickupPower-Reversal Relay DelayRating Plug Current Setting

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1616171717171718181818

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MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsTable of Contents

.* : * Potential Transformer Primary VoltagePotential Transformer ConnectionCommunication Address

191919

Chapter 3. Metering Mode203-1 Overview.

3-2 Metering Mode OperationCurrentVoltageEnergyReal PowerTotal PowerFrequency

20222222222323

Chapter 4. Status Mode244-1 Overview.

4-2 Status Mode OperationNormal Status DisplayLong-Time Overcurrent Pickup and Target DisplaysShort-Time Overcurrent Target DisplayInstantaneous Target DisplayGround-Fault Target DisplayProtective-Relay Target DisplaysClearing the Target After Trip

242424

/•'A 242425.

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Chapter 5. Maintenance and Trouble-Shooting5-1 Trip Unit Removal and Replacement

POWER BREAK Insulated-Case Circuit BreakersType AKR Low-Voltage Power Circuit Breakers ...

5-2 Rating Plug Removal and Replacement5-3 Trouble-Shooting Guide

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MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsList of Figures

1. Front view of MicroVersaTrip PM trip unit2. Rear view of MicroVersaTrip PM tt'ip unit .3. Function key placement on face of trip unit4. Liquid crystal display segments5. Operation of FUNCTION key, showing progression among trip unit operating modes.6. Trip unit setup mode programming function flow7. Trip unit display for long-time pickup8. Time-current curve illustrating long-time pickup9. Trip unit display for long-time delay

10. Time-current curve illustrating long-time delay11. Trip unit display for short-time pickup12. Time-current curve illustrating short-time pickup13. Trip unit display for short-time delay14. Time-current curve for short-time delay with l 2T OUT15. Time-current curve for short-time delay with l2T IN ;

16. Trip unit display for instantaneous pickup17. Instantaneous overcurrent protection set point18. Trip unit display for ground-fault pickup19. Time-current curve for ground-fault pickup20. Trip unit display for ground-fault delay21. Time-current curve for ground-fault delay with l2T OUT22. Time-current curve for ground-fault delay with l 2T IN23. Trip unit display for voltage-unbalance relay pickup24. Trip unit display for voltage-unbalance relay delay25. Trip unit display for current-unbalance relay pickup26. Trip unit display for current-unbalance relay delay27. Trip unit display for undervoltage relay pickup28. Trip unit display for undervoltage relay delay29. Trip unit display for overvoltage relay pickup30. Trip unit display for overvoltage relay delay31. Trip unit display for power-reversal relay pickup32. Trip unit display for power-reversal relay delay33. Trip unit display for rating plug current set point34. Trip unit display for potential transformer primary voltage set point35. Trip unit display for potential transformer connection choice36. Trip unit display for setting communication address37. Trip unit metering mode function flow38. Trip unit display for current metering39. Trip unit display for line-to-neutral voltages

125689

13131313141414141415151515 ©1616161617171717171718181818191919202222 i;i

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MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsList of Figures

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2240. Trip unit display for line-to-line voltages.41. Trip unit display for aggregate energy42. Trip unit display for real power with line-to-neutral connections43. Trip unit display for aggregate real power with line-to-line connections.44. Trip unit display for total power with line-to-neutral connections45. Trip unit display for aggregate total power with line-to-line connections46. Trip unit display for frequency in each phase47. Trip unit display for normal status48. Trip unit status display for long-time overcurrent pickup49. Trip unit status display for long-time overcurrent trip50. Trip unit status display for short-time overcurrent trip51. Trip unit status display for ground-fault trip52. Trip unit status display for protective-relay trip...,

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MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsList of Tables

1. Trip unit catalog number prefixes and corresponding current sensor ratings2. Trip unit catalog number suffixes for optional functions3. MicroVersaTrip PM trip unit suffixes for communication, metering, and relaying4. Rating plug catalog numbers5. Protective relay and metering accuracies and resolutions6. Abbreviations used in setup procedure descriptions7. Actions of function keys in trip unit operating modes8. Nominal delays for long-time delay bands9. Nominal delays for i2t out short-time delay bands

10. Ground-fault pickup settings, as a function of sensor rating11. Nominal delays for ground-fault delay bands12. Trip unit rating plug options13. Trip unit display codes for protective relays

2334678

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MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 1. Introduction

1-1 Read This FirstThe MicroVersaTrip® Plus and MicroVersaTrip®PM trip units described in this publication are usedon both Power Break® insulated-case and Type AKRlow-voltage power circuit breakers.Spectra /IMS molded-case circuit breakers use differentversions of MicroVersaTrip Plus and MicroVersaTrip PMtrip units that are not interchangeable with the unitsdescribed here. Refer to GEH-5934 for information on thesetrip units.

Testing of MicroVersaTrip Plus and MicroVersaTripPM trip units may be performed with the trip unitinstalled in the circuit breaker, the rating pluginstalled in the trip unit, and the breaker carryingcurrent. The test set catalog number is TVRMS. Thetest set plugs into the test socket of the rating plug.Test set TVRMS may also be used for MicroVersaTripRMS-9 and Epic MicroVersaTrip trip units. Referto the Maintenance and Troubleshooting section foradditional details.

1' •4

Figure 1. Front view of MicroVersaTrip PM trip unit.1-2 Product StructureMicroVersaTrip Plus and MicroVersaTrip PM tripunits are removable. Figures 1 and 2 contain frontand rear views of a MicroVersaTrip PM trip unit.

CAUTION: Removal of the rating plug while thebreaker is carrying current reduces the breaker’scurrent-carrying capacity to approximately 25% of

Figure 2 shows the 36-pin plug that connects either the current sensor rating. This may result in unde-trip unit to the circuit breaker and equipment cir- sired tripping.cuitry. This plug is called the trip unit disconnect.

CAUTION • Removal of a trio unit from its breaker N0TE* TriP UnitS aS received may have settings that

SSwxth^hTbrXr inTe OPFN or are undesirable for the -Pedfic aPPdcation. Ensure

TRIPPED position. Draw-out breakers should be *at setun85 arc Rusted before ener-racked out first. Sizing.

CAUTION: Do not attempt to operate the breakerwithout its assigned trip unit. Installation of anincorrect trip unit may result in unsafe operation ofthe breaker.

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1



MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsChapter 1. Introduction m

- High-range (fixed) instantaneous overcurrentprotection

- Short-time protection, with or without I2T- Ground-fault protection, with or without I2T- Zone-selective interlock, with ground fault

only or with both ground fault and short timeAdditional optional functions available only with JPMstyle trip units are as follows. PM style trip unitsrequire the presence of external control power.

• Configurations- Communication and metering- Communication and protective relaying- Communication, metering, and protective

relaying• Metering and protective-relaying functions

- Voltage- Energy (kWh/MWh)- Real power (kW/MW)- Total power (kVA/MVA)- Frequency (Hz)- Protective relays (undervoltage, overvoltage,

voltage unbalance, current unbalance, andpower reversal)

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Figure 2. Rear view of MicroVersaTrip PM trip unit.

1-3 Trip Unit Functions 1-4 Trip Unit Catalog NumbersMicroVersaTrip Plus and MicroVersaTrip PM tripunits have specific standard and optional functions.All trip units share a series of interchangeable rating-plugs. The standard functions for both types of tripunit are as follows:

• Protection- Long-time protection- Instantaneous protection

A simple catalog numbering system defines all of thestandard and optional trip unit functions. The pre-fixes tliat determine the allowable current sensor rat-ings hre listed in Table 1. One of these is present onall trip unit catalog numbers. Immediately followingthis prefix is the letter L, indicating long-time over-current protection.

• Status- Trip target

• Metering display- Phase current (selectable among phases)

The optional functions available on both types of tripunit are as follows:

• Adjustable protection- Switchable instantaneous and ground-fault

protection (Type AKR only)

Current Sensor Ampere RatingsPower BreakPrefix AKR200, 400, 800,

1000, 1600, 2000150, 400, 600, 800,

1600, 2000TT20

2500, 3000TT32 3200TT40 40004000

Table 1. Trip unit catalog number prefixes and correspondingcurrent sensor ratings.

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MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsChapter 1. Introduction

Additional letters are appended to the catalog num-ber to indicate installed protective functions, as inTable 2. These suffixes are valid for both Plus and

(blank) - MicroVersaTrip Plus

PM style trip units. They are appended from left to J.5 Rating Plugsright in the order given.

Interchangeable rating plugs are used to establish orchange the current rating of the breaker. Ratingplugs for MicroVersaTrip Plus or MicroVersaTrip PMtrip units in either Power Break or Type AKR break-ers are interchangeable within the same sensor rat-ing. Rating plugs for Power Break and Type AKRbreakers can not be interchanged with Spectra RMSMicroVersaTrip Plus and MicroVersaTrip PM tripunits.A built-in rejection feature prevents the insertion ofa rating plug with an incorrect sensor rating into atrip unit. Likewise, a Spectra RMS rating plug cannot be inserted into a Power Break or Type AKRbreaker.Rating plug catalog numbers are listed in Table 4.

Protective FunctionSuffixShort-time overcurrentS

I Instantaneous overcurrent

Fixed high-range instantaneousHGround faultG

Z1 or Zone-selective interlock:Z1-ground fault onlyZ2 -ground fault and short time

High-range instantaneous (AKR-30 S only)

Z2

KSwitchable instantaneous and groundfault (AKR only)

X

Table 2. Trip unit catalog number suffixes for optional functions.

MicroVersaTrip PM catalog numbers contain anadditional one- or two-letter suffix to indicate the

1-6 Equipment interfaces- iV

communication, metering, and relaying functions MicroVersaTrip Plus Trip Unitsinstalled, as shown in Table 3. MicroVersaTrip Pluscatalog numbers do not have this final suffix. MicroVersaTrip Plus trip units do not usually require

connections within the equipment, since all wiring iscontained within the circuit breaker. The only twoconnections are for optional zone-selective interlock(Z1 and Z2), made by secondary disconnect, and theneutral sensor, which uses a special dedicated dis-connect.Zone-selective interlocking coordinates breakers, sothat the downstream breaker is allowed the firstopportunity to clear a disturbance. The two types ofzone-selective interlocking available are Zl, whichreacts only to ground faults, and Z2, .which reacts toboth ground faults and short-time overcurrentpickups.

Suffix FunctionMicroVersaTrip Plus trip unit(none)

PM Metering, relaying, and communication

Metering and communicationMRelaying and communicationP

Table 3. MicroVersaTrip PM trip unit suffixes for communica-tion, metering, and relaying.

For example, a trip unit with catalog numberTT32LSIG has the following functions:

TT32 - trip unit for sensor greater than 2000 andup to 3200 amperes.

L- long-time overcurrent protectionS-short-time overcurrent protectionI-standard instantaneous protectionG-ground-fault protection

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'51rSensorRating, Amps

PlugRating Breaker Frames

Neutral Current SensorsCat. No.TR1B60TR1B80TR1B100TR1B125TR1BI50

60 CAUTION: Neutral current sensors are required forthree-phase, four-wire systems. When the trip unit isconnected to a three-phase, three-wire system, theneutral sensor terminals are left open. Do not shortany neutral current sensor terminals in a three-phase, three-wire system, as this could result in dam-age to or malfunction of the electrical system.

80AKR30S, AXR30H150 100

125150

TR2B100TR2B150TR2B200

100200 150 TP82, THP82

TC82, THC82200TR4B150TR4B200TR4B225TR4B250TR4B300TR4B400

150200

400 225 TP84, THP84TC84, THC84

AKR30S, AKR30H250 MicroVersaTrip PM Trip Units

In addition to the inputs received by MicroVersaTripPlus trip units, MicroVersaTrip PM trip units alsoreceive inputs from external voltage conditioners, a24 Vdc control power supply, and communicationconnections. External 24 Vdc control power isrequired for operation.PM style trip units are also connected to an auxiliaryswitch within the breaker that senses the breakerposition.

300400

TR8B300TR8B400TR8B450TR8B500TR8B600TR8B700TR8B800

300400450 TP88, THP88

TC88, THC88AKR30S, AKR30HAKR50S, AKR50H

800 500600700800

TR10B400TR10B600TR10B800TR10B900

TR10B1000

400600 TC2510, THC2510

TP1610, THP1610TP2510, THP2510

1000 800900

1000TR16B600TR16B800

TR16B1000TR16B1100TR16B1200TR16B1600

600POWER LEADER Communication NetworkThe POWER LEADER Communication Network(commnet) transmits data and instructions betweenthe trip unit and an external intelligent device. Theexternal device may be the POWER LEADER system,the Epic system, or a POWER LEADER Monitor.Devices on commnet may be up to 1000 feet apartwithout signal repeaters, subject to certain con-straints.Commnet connections are made directly to wiringterminations on breaker frames. All commnet con-nections to the trip units are made through the 36-pin plug on the trip unit, which mates with a recep-tacle on the breaker frame. These additional connec-tions are made to the equipment through the sec-ondary disconnect of the breaker.

8001000 TC1610, THC1610

AKR50S, AKR50HTP1616, THP1616

1600 110012001600

TR20B750TR20B800

TR20B1000TR20B1200TR20B1500TR20B1600TR20B2000

750800 TC2020, THC2020

TC2520, THG2520TP2020, THP2020TP2520, THP2520

AKRT50H

10002000 1200

150016002000

TR25B1600TR25B2000TR25B2500

16002500 2000 TC2525, THC2525

TP2525, THP25252500TR30B2000TR30B2500TR30B3000

200025003000 TC3030, THC3030

TP3Q30, THP30303000TR32B1200TR32B1600TR32B2400TR32B3200

12001600

3200 2400 AKR753200

TR40B1600TR40B2000TR40B2500TR40B3000TR40B3600TR40B4000

16002000 Voltage Inputs

Voltage inputs are sensed by conventional instru-ment potential transformers(PTs). PTs have 120 Vacsecondaries and must always be used in threes; noopen-delta connections are permitted. PT primariesare connected either line-to-line or line-to-neutral, asrequired.

2500 TC4040, THC4040TP4040, THP40404000 3000

36004000

Table 4. Rating plug catalog numbers.

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PTs may be used for other monitoring functions,subject to reasonable burden limitations. Note thatPTs must be connected in a specific sequence toensure proper phase relations and power-flowsensing.Each PT output feeds an individual voltage condi-tioner that scales the nominal voltage to approxi-mately 1.76 Vac.

• Top right comer - replacement trip unit ordernumber, such as TT09N031, and date-of-manu-facture code of the trip unit, such as E301=.

• Top left of display - catalog number of the tripunit, such as TT32LSPM.

• Top right of display-sensor rating of the trip unit,such as SENSOR = 1600A.

• Below display - indicates whether the unit isMicroVersaTrip Plus or MicroVersaTrip PM.

There are two more labels on the trip unit that arenot generally visible when it is plugged into abreaker.

• Top of unit - another date code and a bar code,used for manufacturing only.

• Rear of unit ~ yellow caution label.

Power RequirementsA small amount of power is necessary to energize theliquid crystal display (LCD) during setup, for viewingbreaker status, and for metering displays.MicroVersaTrip PM trip units require external 24Vdc control power for operation. The four sources ofsuch power are the following.

• Flow of current - Breaker current sensors providesufficient power to energize the LCD when atleast 20% of the sensor’s ampere rating isflowing.

Function KeysThere are four function keys on the trip units,marked FUNCTION, SELECT, VALUE, and ENTER, as

• 24 Vdc control poxoer - Breakers with illustrated in Figure 3. All setup, status, and meteringMicroVersaTrip PM trip units are supplied with functions and displays are accessed through theseexternal 24 Vdc power that, whenever present, keys. Control power is necessary to operate functionenergizes the LCD. Some breaker models that keys. However, as each set point is entered, it isare configured for MicroVersaTrip Plus trip stored in the trip unit’s nonvolatile memory, so sub-units may be optionally equipped to accept an sequent loss of power does not lose or change any

settings.external 24 Vdc supply.• MicroVersaTrip Test Kit - The MicroVersaTrip

Test Kit, Cat No. TVRMS, contains a 24 Vdcpower supply. The LCD is energized wheneverthe test kit jack is plugged into the test recepta-cle on the rating plug.

• MicroVersaTrip battery pack - The portableMicroVersaTrip battery pack contains a 24 Vdcpower source and a jack. The LCD is energizedwhen the jack is plugged into the rating plugtest receptacle.

mmmip!i

IBFUNCTION SELECT

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vsassas gSSjj

::::::::::

VALUE ENTER

Figure 3. Function key placement on face of trip unit.

The functions of the four keys are• FUNCTION- selects the mode of display.• SELECT-chooses the next item for display.• VALUE - selects the phase-to-phase display or

allows changing of set points.• ENTER -stores set points.

Chapter 2 describes the operation of these keys indetail.

7-7 Trip Unit InformationTrip Unit Label InformationFollowing are descriptions of the various labels onthe front of the trip unit, as shown in Figure 1.

• Top left comer- serial number of the unit, such asLBA000393.

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MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsChapter 1. Introduction mV.vi'Refer to trip-time curves in GES-9865 (AKR), GES-

9866 (Power Break and R-Frame) , and GES-9863(ground fault) for accuracies of overcurrent protec-tion.

Liquid Crystal DisplayFigure 4 illustrates the LCD with all segments illumi-nated. The various segments are energized inresponse to conditions sensed by the trip unit.

Full-ScaleAccuracy1-8 MicroVersaTrip Plus and

MicroVersaTrip PM AccuraciesThe accuracy data in Table 5 represent the averageexpected performance of MicroVersaTrip Plus andMicroVersaTrip PM trip units, together with theirassociated current sensors, rating plugs, potentialtransformers, and voltage modules. These data arevalid for setup, metering, and status mode displays.They include the effects of trip unit ambient-temper-ature variation from 0° C to 70° C.All percentages are based on full-scale values. Full-scale current is X, the rating of the breaker’s ratingplug. Full-scale voltage is the potential transformerprimary voltage rating. These data do not includethe accuracy rating of any measuring instrument.

ResolutionValue

± 2% ± 0.5 digitCurrent (A, kA)

± 1.5%Voltage (V) ± 0.5 digit± 3.5%Energy (kWh, MWh) ± 0.5 digit± 3.5%Real power (kW, MW) ± 0.5 digit± 3.5%Total power (kVA, MVA) ± 0.5 digit

Frequency (Hz) ± 1 Hz ± 1 HzTime delay (sec) ± 1 sec ± 1 sec

Table 5. Protective relay and metering accuracies andresolutions.

H.HH VOLTSAMPS

ABC SETUPS X C STATUS

METERkA kWh mW mWhkW Hz

ORT CIRCUIT GF NORMALLTIME STIME INST GF l2T IN l2T OUTVU CU UV OV PR VL-L VL-N ENGY

PICKUP DELAYPWR FREQ PFFigure 4. Liquid crystal display segments.

6



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 2. Setup Procedures

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2-2 Operating Modes2-1 OverviewThis chapter describes the operation of the four MicroVersaTrip Plus and MicroVersaTrip PM tripfunction keys, set point and time-delay adjustments, units have three operating modes: Status, Metering,and their accuracies. The setup procedures should and Setup. The effects of each of the four functiononly be repeated if the trip unit or the protection keys in each mode are listed in Table 7.characteristics are changed, requiring different setpoints and time delays. All the function keys, except for ENTER, automati-

cally step the trip unit display to the next availableThese procedures apply to MicroVersaTrip Plus and option each time the key is pressed. Continued press-MicroVersaTrip PM trip units. Setup programming ing of a key eventually loops the display back to themust be performed with the rating plug installed. initial option for that function. This is illustrated in

Figure 5 for the FUNCTION key, which shows thatrepeatedly pressing this key cycles the mode amongStatus, Metering, and Setup. Pressing the ENTER keymore than once has no effect.

For trip units set up through either the POWERLEADER system or the Epic MicroVersaTrip FieldProgramming Unit, refer to instructions publishedfor those systems.Table 6 contains a list of abbreviations usedthroughout the description of the setup procedures.

Depressing the VALUE key for about 5 seconds acti-vates a fast scan that rapidly displays each of theavailable set points or time delays for some of thetrip characteristics.

Abbr. DescriptionRating plug ampere rating.X

S Current sensor ampere rating.Long-time (LT) setting in amperes.Multiply LT set point by rating plugamperes (A).

C

Short-time (ST) withstand rating ofbreaker in amperes.

H

100% total power setting of power-reversalrelay.Delta: Q= 1.732 x 100%Vx X/1000 kVAWye: 3-0*100%Vx A71000 kVA

6

FUNCTION key on face of trip unit.FSELECT key on face of trip unit.SVALUE key on face of trip unit.VENTER key on face of trip unit.E

Table 6. Abbreviations used in setup procedure descriptions.

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MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsChapter 2. Setup Procedures

Trip Unit Operating ModeKey Symbol Setup Metering Status

Select one of three modes: Setup, Metering, StatusFUNCTION F

Select next programmingdisplay

Select next metering display No effectSSELECT

Display next set-point ortime-delay value

Display next phase value No effectVVALUE

Store set-point or time-delayvalue into memory

No effect No effectEENTER

Table 7. Actions of function keys in trip unit operating modes.

F F FSETUP STATUS METER

Figure 5. Operation of FUNCTION key, showing progression among trip unit operating modes.

2-3 Setup Mode Operation unit display. Ignore setup mode instructions for suchfunctions.The trip unit must be provided with control powerduring setup. This can come from a MicroVersaTripTest Kit, a MicroVersaTrip battery pack, external 24Vdc power supply, or energizing the breaker to atleast 20% of its sensor load.To begin the process, press the FUNCTION k|y untilSETUP appears in the upper-right corner of the tripunit’s LCD. Setup mode always begins with long-timepickup. After a choice has been made for this andeach subsequent trip function, press SELECT toadvance to the next function.

The following instructions describe setup proceduresfor all available trip unit functions. These are illus-trated in Figure 6. All trip units provide long-timeovercurrent, long-time delay, and some form ofinstantaneous overcurrent protection when installedin Power Break circuit breakers. All other functionsare optional,

If a specific set of trip unit functions, such as relayingor short-time overcurrent protection, has not beenordered, that function will not appear on the trip

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8



MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsChapter 2. Setup Mode

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V KEY:JFj FUNCTION

Si STATUS

[V] VALUE~El ENTER

FFF METER SETUPSTATUS

* Setting Choices0.50X to 1.1OX,steps of 0.05XSETUP1 X

Long-Time

PickupV VV “0.55 - 1.05 1.100.50

LTIME

sNo Other

Setting ChoicesSETUP*Long-TimeDelay

! V3 V- 4V - 2 VLTIME

DELAY

S Setting Choices1,5C to 9.0C,steps of ,5CSETUPI5Q cShort-

TimePickup

VV -2.00 — v— 8.50 9.001.50-A • M M

k- • 'y STIME

PICKUP

s*«

§ETUPtShort-TimeDelay

vv v — 32l2T INSTIME

DELAYNo Other

Setting Choices

SETUPI 2 3V V VSTIME |!T OUT

DELAYSetting Choices1.5X to 15,OX, insteps of 0.5X, withmaximum dependenton frame rating

itoKv

SSETUP

XInst.

V — 2.0 14.5- V1.5PickupINST

PICKUP

(A) Continued on next page

Figure 6. Trip unit setup mode programming function flow.

9



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 2. Setup Mode

A

SE

SETUP Sensor Ratings

150-600 A

sGround-Fault

Pickup.20 V - .21 .59 .60v vGF

PICKUP

10—r̂ Hv]20j—[VlQHvhT2i

T37 |—[ \71 2500-3200 A

29 j—|VHIQ -—( V | 4000 A

sB a

No OtherSetting ChoicesSETUPIGround-

FaultDelay

\ vv - 2 3 VGF l!T IN

DELAY

(Additional OFF settingfor X option.)SETUP

2V V V3GF in OUT

DELAY

s Setting Choices10 to 50%, in

increments of 1%r^- E

I!] SETUPVoltage-

UnbalancePickup

10 — V — 11 V V49 50VU

PICKUP

s Setting Choices1 to 15 sec, off

increments of 1 secSETUPH s

Voltage-Unbalance

DelayV - 2 — 15 V V—~t H U B

VU


increments of 1%SETUPIECurrent-Unbalance

Pickup10 - V 49 - V V11 50Mas

cuPICKUP

(B) Continued on next page

Figure 6. Trip unit setup mode programming function flow (continued).

10

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KEY:[~F

~| FUNCTION~sl STATUS

FVI VALUE~E ] ENTER

B

S Setting Choices1 to 15- sec, off

increments of 1 secSETUPE $Current-

UnbalanceDelay v v OFF- V2 - 15H U B

cuDELAY


increments of 1%SETUP

Under-VoltagePickup

v V V50 51 - 89 90B O B

uvPICKUP

Setting Choices1 to 15 sec, off

increments of 1 sec

i- E

B SETUPSUnder-

VoltageDelay

5 V — OFFV- 2 VM »

uvDELAY

Setting Choices110 to 150%, in

increments of 1 %

s

I55 SETUPOver-

VoltagePickup v 150- V110 111I 149V

ovPICKUP


increments of 1 secIE SETUPS

Over-VoltageDelay

1 - V 14 - V — OFF- V2 a

OVDELAYi

s Setting Choices0.01 to 3.00 Q, in

increments of .01QEn i SETUP

Power-ReversalPickup

.u i 2.99 — V.01 VV - 02 — 3.00n a a

PRPICKUP

(C) Continued on next page

Figure 6. Trip unit setup mode programming function flow (continued).V*

11



Chapter 2. Setup Mode


increments of 1 secin SETUPSPower-

ReversalDelay

iu vV1 - V - 2 15

PR DELAY*Setting Choices

60, 80, 100, 126, 150, 200, 225,250, 300, 400, 460, 600, 600, 700,

750, 800, 1000, 1200, 1500, 1600,2000, 2500, 3000, 3200, 3600, 4000 .

sSETUP

AMPS X

Rating V — 80|- 3600|-—1 \7 |—14000 V60 N M B

Plug

s Setting Choices120 to 600 volts

increments of 1 VVOLTS SETUPPotential

TransformerPrimaryVoltage

v 6001211 599120 VV

sSETUPVOLTS

No OtherSetting ChoicesPotential

TransformerConnection

V — VL-N- VVL-LVL-L

Setting Choices256 to 999

increments of 1SETUP595CommunicationAddress — 998- V 999- VV256 257 — B O D

Figure 6. Trip unit setup mode programming function flow (continued).

12




choices of time-delay bands. Press ENTER to store thedesired value.

Long-Time PickupThe first setup-mode display is always the long-timepickup set point, as illustrated in Figure 7. This setpoint establishes the breaker’s nominal ampere rat-ing, C, as a fraction of X, the rating plug value. Pressthe V A L U E key to scroll through the availablechoices. Press ENTER to store the desired set point.

SETUP

LTIMEDELAYSETUP

X Figure 9. Trip unit display for long-time delay.

LTIME Delay, secBandPICKUP 1 3

Figure 7. Trip unit display for long-time pickup. 2 63 12The choices for Power Break circuit breakers are

0.50 to 1.00 times X, in steps of 0.05. The pickupvalue is defined for -0% to +20% of the set point.The choices for Type AKR circuit breakers are 0.50to 1.10 times X, in steps of 0.05, The pickup value isdefined for-10% to +10% of the set point.Figure 8 illustrates the long-time pickup settings.

4 16

Table 8. Nominal delays for long-time delay bands.

v •

Time-DelayBands0)

E

Pickup Settings

(D£

Current

Figure 10. Time-current curve illustrating long-time delay.

Short-Time PickupThe short-time pickup display is shown in Figure 11.This function, illustrated in Figure 12, establishes thecurrent at which short-time trip is activated. Thereare 16 choices of pickup settings, from 1.5 to 9.0times C, in steps of 0.5 C.

Current

Figure 8. Time-current curve illustrating long-time pickup.

Long-Time DelayThe trip unit display for long-time delay is illustratedin Figure 9. This function allows normal momentaryoverloads without nuisance tripping. The nominaltime delays at 600% of C are listed in Table 8. Figure10 illustrates the effect of this delay on trip time.Press the V A L U E key to cycle through the four

; ;’.i

A-A'

13




SETUP Time Delays, sec150 BandC

1 0.102 0.21

STIME 3 0.35

Table 9. Nominal delays for l2T OUT short-time delay bands.Figure 11. Trip unit display for short-time pickup.

<D£ Delays with

l2 TOUTQ Short-Time

Pickup Settings£

/Current

Figure 14. Time-current curve for short-time delay with l2T OUT.Current

Figure 12. Time-current curve illustrating short-time pickup. pm

Short-Time DelayThe trip unit display for short-time delay is shown inFigure 13. This function delays the breaker trip on ashort-time trip. The choices are listed in Table 9. Thedelay with I2T IN is for a current of 600% of C at thelower limit of the band. The delay with I2T OUT is forthe lower limit of each band.The I2T OUT function, illustrated in Figure 14, estab-lishes a constant time delay. I2T IN biases the delaywith a constant slope, as shown in Figure 15.

<D£ Delays with

l2T INi~

/Current

Figure 15. Time-current curve for short-time delay with l2T INSETUP

Instantaneous PickupInstantaneous overcurrent protection, with trip unitdisplay shown in Figure 16, causes an immediatebreaker trip when the chosen current level isreached. The pickup value may be set in the range of1.5 to 15.0 times X, in steps of 0.5 X. Note the differ-ence from short-time pickup, which is based on amultiple of C. The time-current characteristic isshown in Figure 17.

PTINSTIME

Figure 13. Trip unit display for short-time delay.

r-Y'>

14




V : )

SETUP settings are listed in Table 10 as multiples of S, thecurrent sensor rating, in steps of 0.01 S. The maxi-mum value is limited to 1200 A. Figure 19 illustratesthe time-current curve for ground-fault pickup.

X

INSTSETUPSOPICKUP s

Figure 16. Trip unit display for instantaneous pickup.

GF

PICKUP

Figure 18. Trip unit display for ground-fault pickup.CD£F Sensor, A Set Points

InstantaneousPickup Setting 150 - 2000 0.20 to 0.60

2500 - 3000 0.20 to 0.374000 0.20 to 0.30

Current

Figure 17. Instantaneous overcurrent protection setpoint.\

Table 10. Ground-fault pickup settings,as a function of sensorrating.

•> •

If a 3000 A, 3200 A, or 4000 A sensor is installed inthe breaker, instantaneous pickup is automaticallylimited to 13.0, 10.0, or 9.0 X, respectively.

On trip units with the user-selectable switch-able instantaneous overcurrent and ground-fault option, an additional value of OFFappears at the end of the listing of numericalvalues. Choose this setting to disable instan-taneous protecdon.

i!

Ground-FaultPickup Settings

CDEF

High-Range Instantaneous OvercurrentProtectionHigh-range instantaneous overcurrent protection hasa fixed trip setting equal to the breaker frame’sshort-time withstand rating, with pickup tolerance+0%, -20%. When this option is installed, skip pro-gramming of instantaneous pickup and go on to thenext function by pressing SELECT.

Current

Figure 19. Time-current curve for ground-fault pickup.

!i

Ground-Fault PickupThe trip unit display for ground-fault pickup isshown in Figure 18. This function sets the pickupcurrent for ground-fault protection. The available

••• H

15



5

MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 2. Setup ModeGround-Fault DelayThis function sets the delay before the breaker tripswhen the ground-fault pickup current has beendetected. The trip unit display is shown in Figure 20.The choices are listed in Table 11. The delay for I2TOUT is at the lower limit of each band. The delay forI2T IN is at 200% of the pickup setting at the lowerlimit of the band.

Delay Set Pointswith l 2 T IN<D

£/

\

SETUP

c Current

Figure 22. Time-current curve for ground-fault delay with l2T IN.I2T OUTGF

With the X option (switchable ground fault), an OFFselection appears as an additional time-delay setpoint, Selecting OFF disables ground-fault protec-tion.

DELAY

Figure 20. Trip unit display for ground-fault delay.

Band Time Delay, secVoltage-Unbalance Relay PickupThis function compares the highest or lowest phasevoltage with the voltages of the other two phases andinitiates a trip if the difference exceeds the set point.The true rms voltage is computed for each phase.The range of set points is from 10 to 50%, with anincrement of 1%. The trip unit display is shown in

0.1010.2120.353

Table 11. Nominal delays for ground-fault delay bands.

The I2T OUT function establishes a constant timedelay, as shown in Figure 21.12T IN biases the delay Figure 23.with a constant slope, as shown in Figure 22,

SETUP

Delay Set Pointswith l2 T OUT

VUPICKUP

<n z£ Figure 23. Trip unit display for voltage-unbalance relay pickup,\-

Voltage-Unbalance Relay DelayThis function sets the delay time before a voltage-unbalance trip occurs. The range of delays is 1 to 15seconds, in steps of 1 second. Choosing OFF disables

Figure 21. Time-current curve for ground-fault delay with l2T voltage-unbalance protection. The trip unit display isshown in Figure 24.

Current

OUT.%

16



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 2. Setup Modem SETUP 90% of the nominal voltage, with an increment of

1%. The trip unit display is shown in Figure 27.. • - v

S

SETUP5nvu

Figure 24. Trip unit display for voltage-unbalance relay delay.UV

PICKUPCiUTent-Unbalance Relay Pickup

This function compares the true RMS current in thehighest or lowest phase with the other two phasesand initiates a trip if the difference exceeds the set Undervoltage Relay Delaypoint. The range of set points is 10 to 50%, with an This function sets the delay time before an under-increment of 1%. The trip unit display is shown in voltage trip occurs. The range of delays is 1 to 15Figure 25. seconds, in steps of 1 second. Choosing OFF disables

undervoltage protection. The trip unit display isshown in Figure 28.

Figure 27. Trip unit display for undervoltage relay pickup.

SETUP

SETUPS

cuPICKUP

Figure 25. Trip unit display for current-unbalance relay pickup. UVDELAY

Figure 28. Trip unit display for undervoltage relay delay.Current-Unbalance Relay DelayThis function sets the delay time before a current-unbalance trip occurs. The range of delays is 1 to 15 Overvoltage Relay Pickupseconds, in steps of 1 second. Choosing OFF disables This function measures the true rms voltage in allcurrent-unbalance protection. The trip unit display is phases and initiates a trip if any phase voltageshown in Figure 26. exceeds the set point. The range of set points is 110

to 150% of the nominal voltage, with an incrementof 1%. The trip unit display is shown in Figure 29.SETUP

S

SETUP

CUDELAY

Figure 26. Trip unit display for current-unbalance relay delay. 0VPICKUP

Figure 29. Trip unit display for overvoltage relay pickup.Undervoltage Relay PickupThis function measures the true rms voltage in allphases and initiates a trip if any phase voltage dropsbelow the set point. The range of set points is 50 to

V;

17




\r;pSETUPOvervoltage Relay DelayThis function sets the delay time before an overvolt-age trip occurs. The range of delays is 1 to 15 sec-onds, in steps of 1 second. Choosing OFF disablesovervoltage protection. The trip unit display is shownin Figure 30.

H S

PRDELAY

Figure 32. Trip unit display for power-reversal relay delay.SETUP1 S

Rating Plug Current SettingThe trip unit display for rating plug setting is shownin Figure 33. Enter the current setting of the ratingplug by scrolling through the list with VALUE andpressing ENTER when the correct value is reached.Table 12 lists the available rating plugs for the vari-ous trip units.

OVDELAY

Figure 30. Trip unit display for overvoltage relay delay.

Power-Reversal Relay PickupThis function measures the direction of power flowthrough the breaker and initiates a trip if a sufficientmagnitude of reverse current is detected. The rangeof set points is 0.01 Q to 3.00Q, in steps of 0.01. Qisthe rating plug kVA and is calculated as shown inTable 6. Note that the PR indication on the trip unitdisplay flashes when power direction is from load toline. The trip unit display is shown in Figure 31.

CAUTION: Incorrect storage of this set point willresult in incorrect metering values. Even if this set-ting is entered remotely, it must be entered againlocally.

SETUP225 AMPS X

SETUP

Figure 33. Trip unit display for rating plug current set point.

PRPICKUP Rating Plug Options, AmpsCat.No.

Figure 31. Trip unit display for power-reversal relay pickup. 60, 80, 100, 125, 150, 200, 225, 250, 300,400, 450, 500, 600, 700, 800, 1000, 1200,1500, 1600, 2000

TOO

Power-Reversal Relay DelayThis function sets the delay time before a power-reversal trip occurs. The range of delays is 1 to 15seconds, in steps of 1 second. Choosing OFF disablespower-reversal protection. The trip unit display isshown in Figure 32.

1200, 1600, 2000, 2400, 2500,3000, 3200TT32TT40 1500, 1600, 2000, 3000, 4000

Table 12. Trip unit rating plug options.

18



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 2. Setup Modem

Potential Transformer Primary VoltageEnter the primary voltage rating of the potential Note that this step applies only to MicroVersaTriptransformer, as illustrated in Figure 34. The range of PM trip units connected to either POWER LEADERvalues is 120 to 600 volts, with an increment of 1 volt, or Epic MicroVersaTrip systems.

With POWER LEADER systems the address isassigned at the breaker. The set point values are sep-arated by decimal points to differentiate theaddresses from other set points, as illustrated inFigure 36. The address options are from 256 to 999.

Communication Address

CAUTION: Incorrect storage of this set point willresult in incorrect metering values. Even if this set-ting is entered remotely, it must be entered againlocally.

SETUPVOLTS SETUP E.5.EEllFigure 36. Trip unit display for setting communication address.Figure 34. Trip unit display for potential transformer primary

voltage setpoint.With Epic MicroVersaTrip systems, the Epic system’sField Programming Unit (FPU) calls for removal ofthe rating plug. This is not required for addressing aMicroVersaTrip PM trip unit. Simply press ENTER toidentify the unit to the FPU. The address shown on theFPU’s display must not be changed at the breaker.

Potential Transformer ConnectionNote that this step applies only to MicroVersaTripPM trip units.Select the appropriate potential transformer connec-tion, either line-to-line (VL-L ) or line-to-neutral(VL-N ) , as illustrated in Figure 35.CAUTION: Incorrect storage of this set point willresult in incorrect metering values. Even if this set-ting is entered remotely, it must be entered againlocally,

VOLTS SETUP

VL-L

Figure 35. Trip unit display for potential transformer connectionchoice.

:?> v.'

•'A.

19



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 3. Metering Mode m

rent metering. Two configurations of the PM tripunits (with PM and M suffixes in their catalog num-

The metering mode displays parameter values for bers) have the full complement of metering displays,

that part of the electrical system controlled by thebreaker's MicroVersaTrip Plus or MicroVersaTripPM trip unit. Both currents and voltages are com-puted as true rms values. Displayed values areimmune to high levels of harmonics. All meteringdisplays are updated once each second. Accuraciesand resolutions are described in Section 1-8 andTable 5.

3-1 Overview

The trip unit must be provided with control power todisplay metered values. This can come from aMicroVersaTrip Test Kit, a MicroVersaTrip batterypack, an external 24 Vdc power supply, or energizingthe breaker to at least 20% of its sensor load..

3-2 Metering Mode OperationAll values except frequency are displayed to threesignificant figures. For example, phase currentsmight be displayed as 60.7 AMPS, 492 AMPS, or 1.22 until METER appears in the upper-right corner of the

display. Metering mode always begins with the phasecurrents. The sequence in which the metered valuesappear is illustrated in Figure 37.

Metering mode is reached by pressing FUNCTION

kA.The trip unit metering displays are appropriate tothe actual configuration ordered. All MicroVersaTripPlus and MicroVersaTrip PM trip units include cur-

FF FSTATUS METER SETUP tig)

cbUlA BOB B501 AMPSAMPS AMPSMETERMETER METER

-s-Current VV -

5VOLTS A IEVOLTS CVOLTS BBll METER METERMETER -0- VV -Voltage

VL-N VL*N VL-N

or ororVOLTS AC VOLTS A BVOLTS B C HBBMBE HB3 METERMETER METER

VL-L VL-LVL-L

A) Continued on next page

Figure 37. Trip unit metering mode function flow.V5}sy

20



MicroVersaTrip® Pius and MicroVersaTrip® PM Trip UnitsChapter 3. Metering Mode

IV A

S

METEREnergy kWh

ENGY

S

c502A BI 3B.HRealPower I kW METERMETER kW METERkW

-0- v - Vm

PWRPWRPWR

or

6<niu kW METEffor L-L connection

PWR

S)

CB HHHA 835mnV

METERkW # METER kW #kW # METERTotalPower 0- VV -

PWR PWRPWR

or* indicates that the display

segment is flashing.15 METERmW # for L-L connection

PWR

scBA

Hz METERHz METER Hz METER HvpFrequency VV

FREQ FREQFREQ

(Presence of either line voltage or currentis necessary for frequency metering.)S

Back to Current Display

Figure 37. Trip unit metering mode function flow (continued).. ' >-: :)V

f /

21



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 3. Metering Mode

value is displayed from 0 to 999 kWh, then automati-cally switches units to display 1.00 to 999 MWh.When 999 MWh is exceeded, the display switchedback to 0 kWh. The largest negative energy valuedisplayed is -99 MWh.The value in the display can not be reset at the tripunit keypad. The VALUE key has no effect on theenergy display.

CurrentThe initial metering display is phase A line current,as illustrated in Figure 38. Press V A L U E to cycleamong the three phases. Current is displayed from 0to 999 amperes and from 1.00 to a maximum of 999kA.

A6Cl AMPSMETER m3 METER

kWh

E N G YFigure 38. Trip unit display for current metering.

Figure 41. Trip unit display for aggregate energy.VoltageThe voltage displayed by this function depends onhow the trip unit was configured during Setup. If thebreaker was configured with line-to-neutral connec- The value displayed for real power depends on howtions, the display shows individual phase voltages, as the breaker and trip unit were configured. For line-in Figure 39. If the breaker was configured with line- to-neutral connections, the power in each phase isto-line connections, the display shows voltages displayed, as in Figure 42. For line-to-line connec-between the phases, as in Figure 40.

Real Power

tions, the aggregate power is displayed, as in Figure43.

VOLTS A The value is shown from 0 to 999 kW or from 1.00 to999 MW, as appropriate.METER

A30.1VL-N kW METER

Figure 39. Trip unit display for line-to-neutral voltages.

PWRVOLTS A CHBB ' ,-iFigure 42. Trip unit display for real power with line-to-neutral

connections.METER

I0EVL-L

kW METERFigure 40. Trip unit display for line-to-line voltages.

EnergyThis display, illustrated in Figure 41, shows theaggregate energy flow through the breaker. The

PWR

Figure 43. Trip unit display for aggregate real power with line-to-line connections.

22



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 3. Metering Modem Frequency

The value displayed for total power depends on how This display, illustrated in Figure 46, shows the fre-the breaker and trip unit were configured. For line- quency of the line current in each phase. Either lineto-neutral connections, the total power in each phase voltage or current must be present for this display tois displayed, as in Figure 44. For line-to-line connec- appear,

tions, the aggregate total power is displayed, as inFigure 45,

The value is shown from 0 to 999 kW or from 1.00 to999 MW, as appropriate. The kW or mW segment play does not appear,

flashes on the display to indicate that kVA or MVA is Tt c , A . , n uactually being measured, (This is indicated by * inthe figures,)

Total Power

The frequency is calculated from the current andvoltage signals. If both are present, the voltage fre-quency is displayed. If neither are present, this dis-

AEDA Hz METERBRH kW* METER

FREQ

Figure 46. Trip unit display for frequency in each phase.PWR

Figure 44. Trip unit display for total power with line-to-neutralconnections.

'0

1 METERmW*

PWR

Figure 45. Trip unit display for aggregate total power with line-to-line connections.

l

.•V

23



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 4. Status Mode

When the set point is reached, but before the timedelay has expired, the flashing stops, indicating that

4-1 OverviewStatus mode is the normal display mode for breaker trip is imminent,

information. The status display identifies an immi-nent overcurrent trip, then, afterward, target displaysthat indicate the reason for the trip. STATUS

Status displays reflect the options ordered with thetrip unit. All MicroVersaTrip Plus andMicroVersaTrip PM trip units provide informationon long-time overcurrent protection. Only PM styletrip units can be equipped with protective relays and,consequently, display information about them.The trip unit must be provided with control power todisplay status information. This can come from aMicroVersaTrip Test Kit, a MicroVersaTrip batterypack, an external 24 Vdc power supply, or energizingthe breaker to at least 20% of its sensor load.

PICKUP

Figure 48. Trip unit status display for long-time overcurrentpickup.

When the breaker trips for long-time overcurrent,the target display indicates OVERLOAD, as illustratedin Figure 49.

STATUS4-2Status Mode Operation

OVERLOADThis section describes each of the status displays andthe sequences in which they appear.

Figure 49. Trip unit status display for long-time overcurrent trip.Normal Status DisplayWhen the breaker is closed and its circuit energized,the normal status display appears, as illustrated inFigure 47. This display indicates that the trip unit inot in long-time pickup.

Short-Time Overcurrent Target Displayls After a short-time trip, the status display appears as

in Figure 50. The display does not flash.

STATUS STATUS

NORMAL SHORT CIRCUIT

Figure 47. Trip unit display for normal status. Figure 50. Trip unit status display for short-time overcurrent trip.

Long-Time Overcurrent Pickup and TargetDisplaysWhen the long-time overcurrent function hasreached 95% of the trip unit’s current rating, C,PICKUP begins to flash on the display, as illustrated inFigure 48. During the transition from 95% to 100%of the set point, the frequency of flashing increases.

Instantaneous Target DisplayThe status display for an instantaneous trip is similarto that for a short-time trip, as in Figure 50, exceptthat SHORT CIRCUIT flashes repeatedly.

©24



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 4. Status Mode

Clearing the Target After TripWhen a ground-fault trip occurs, the display illus- After any of the above abnormal-operation displays,

the target must be acknowledged and cleared at thetrip unit. If necessary, press FUNCTION until STATUSappears in the display. Press SELECT and VALUEsimultaneously to acknowledge the trip and returnthe display to NORMAL status, as in Figure 47. If thetarget display is not cleared before the breaker is re-energized, it will continue to appear in all modes,

Ground-Fault Target Display

trated in Figure 51 appears.

STATUS

m

Figure 51. Trip unit status display for ground-fault trip.

Protective-Relay Target DisplaysAfter a protective-relay trip, the display indicatesOVERLOAD, which flashes repeatedly, with a two-let-ter code for the type of relay that initiated the trip.This is illustrated in Figure 52 for an overvoltage trip.The codes for the five protective relays are listed inTable 13.

K.y:F: )STATUS

OVERLOAD

OV

Figure 52. Trip unit status display for protective-relay trip.Code Protective Relay

Voltage unbalanceVUCurrent unbalancecuUndervoltageUVOvervoltageOVPower reversalPR

Table 13. Trip unit display codes for protective relays.

: -. • , .'1

VC‘v:V

25



MicroVersaTrip® Plus and MicroVersaTrip® PM Trip UnitsChapter 5. Maintenance and Trouble-ShootingRating plugs and MicroVersaTrip Plus and 5-2 Rating Plug Removal andMicroVersaTrip PM trip units are factory tested andnormally shipped installed in their breaker frameassemblies or as part of a conversion kit. There is norequirement for periodic maintenance of the trip CAUTION: Removal of the rating plug while theunits. There are no user-serviceable components within the breaker is carrying current reduces the breaker’strip units. current-carrying capacity to approximately 25% of

the current sensor rating.

Replacement

Interchangeable rating plugs are removed with aRating Plug Extractor, Catalog No. TRTOOL,

(Suitable equivalents are commercially available as“integrated circuit (DIP) extractors.”) Grasp the rat-ing plug tabs with the extractor and pull the plugout. Be sure to grab the tabs and not the front coverof the rating plug, or the plug may be damaged,

5-1 Trip Unit Removal andReplacementRejection plugs are installed on the rear of all tripunits to prevent installation of an incorrect trip unitinto a breaker. Do not use excessive force wheninstalling a trip unit. Replacement of a trip unitalway,s requires repeating the setup procedures, asdescribed in Chapter 2.

Rejection features are provided on all rating plugs toprevent application mismatches. Never force a ratingplug into place. Refer to Chapter 1 to find the

POWER BREAK Insulated-Case Circuit Breakers appropriate rating plugs for each sensor rating andbreaker frame.POWER BREAK circuit breakers are shipped from

the factory with their trip units installed. Trip unitscan not be removed on site.

If a replacement rating plug has a different ratingthan the plug that was removed, follow the appropri-ate setup procedure in Chapter 2 to enter the newrating.Do not attempt to use a rating plug from a SpectraRMS breaker or a MicroVersaTrip RMS-9/MVT-4function trip in a MicroVersaTrip Plus orMicroVersaTrip PM trip unit.

mType AKR Low-Voltage Power Circuit BreakersType AKR circuit breakers are shipped from the fac-tory with their trip units installed. Removal is neces-sary only for replacement. Trip units are separatelymounted on the breaker structure and are removedby moving the trip unit removal bracket. When a tripunit is replaced, the locking arm snaps back intoplace to indicate proper engagement. 5-3 Trouble-Shooting Guide

The following guide is provided for trouble-shootingand isolating common problems. It does not coverevery possible condition. Contact the CustomerSupport Center at 800-843-3742 if the problem is notresolved by these procedures.

WARNING: Always de-energize Type AKR circuitbreakers before attempting to remove or replace thetrip unit Because of the exposed location of the tripunit, failure to observe this warning may result inequipment damage or personal injury, includingdeath.

W

26



MicroVersaTrip® Pius and PM Trip UnitsChapter 5. Maintenance and Trouble-Shootingm

Corrective ActionPossible CauseSymptomLine current is below 20% At least 20% of the current sensor rating, S, mustof S (MicroVersaTrip Plus) , be flowing through the breaker to activate the

display. If not, power the trip unit with the TestKit or external battery pack.Check that the control power supply is presentand operational.

1. The trip unit displayis blank.

External 24 Vdc is absent(MicroVersaTrip PM).

2. The trip unit display Can occur on Plus style trip Power the trip unit with the Test Kit or externalbattery pack.units when load currentflashes.

fluctuates near 20% of S.

Replace the trip unit.3. The trip unit display The built-in self test hasdetected an error.flashes ERR.

Press FUNCTION until STATUS is displayed. PressSELECT and VALUE together to clear the target.

4. The trip indication Trip unit is not in statustarget will not clear. mode.

i/A. j Commnet wires are shorted Locate and repair the short or the incorrect Con-or improperly connected. nection,

FPU version is lower than Update FPU to version 2.0 or higher.5. Unit does not com-

municate with theMonitor, POWERLEADER DistributionSoftware, or FPU. 2.0.

Trip unit address incorrect. Check that address assigned to trip unit, as inChapter 2, agrees with address at host.

Rating plug value wasdefined incorrecdy.

Read the Xvalue from the rating plug nameplate and enter this with the rating plug currentset point procedure in Chapter 2. Do not enter thesensor rating, S.

6. Current readings areincorrect.

7. Voltage readings areincorrect.

Potential transformer (PT) Read the PT primary rating from the PT nameprimary voltage was defined plate and enter this value with the PT primaryincorrectly. voltage procedure in Chapter 2.PT connection was defined With the PT connection procedure in Chapter 2,incorrectly. enter VL-N for a wye-connected PT primary or

VL-L for a delta-connected PT.Indicates that the total power is metered in kVA.8. kW legend is flashing. Total power metering.

Test Kit-initiated trip indica- Clear target as indicated above (Symptom 4).tion.) 9. Overload target is

flashing by itself.•5 •t

27



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