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Operation and maintenance of

IZM low voltage air circuit breakers

MOELLER

www.moeller.net/de/support

10/09 AWB1230-1605

Effective October 2009

Section 7: Troubleshooting

Introduction

Table 12

will help to determine the probable causes of simple

circuit breaker problems and possible corrective actions. Possible

problems associated with the electronic trip unit are covered in a

companion publication, Moeller AWB1230-1609. If the problem

cannot be resolved with the aid of one or both of these guides,

contact the Moeller service center for more in-depth assistance.

Table 12. Circuit Breaker Troubleshooting Guide

Symptom

Probable Cause

Corrective actions

The circuit breaker

trips

open (red fault trip indicator button

is out and/or fault indicator LED is lighted) when closed on

a load current

Rating plug not installed and load current through the breaker

Install rating plug that corresponds to current sensors

Repeated closing on transient (in-rush) current with thermal

memory active

Wait for circuit breaker (and loads) to cool before re-closing

An overload or fault current condition

Use status and fault indicators to help locate and remove

overload or fault condition

Circuit breaker

opens

(fault trip indicator button is

not

out)

Undervoltage release operates; voltage too low or zero

Check and correct the UVR supply voltage

(85–110% rated voltage)

Shunt trip operates

Check control signal(s) to shunt trip; correct if necessary

Trip latch is defective

Inspect latch condition and engagement before closing;

consult Moeller service center

Circuit breaker cannot be opened remotely, but can be

opened locally

Shunt trip control signal absent or too low

Check supply voltage exceeds 70% of rated voltage when

signal is applied to shunt trip

Shunt trip is faulty or improperly installed

Remove front cover; check voltage supplied to shunt trip;

make sure shunt trip is seated and retainer snapped into

place. Check for shunt trip motion; replace shunt trip if faulty

Secondary contact wiring problem

Make sure electrical pin and socket connectors are properly

seated in molded plug. Verify proper wiring

Circuit breaker cannot be opened locally

OPEN pushbutton locked

Remove lock

Faulty mechanism or main contacts welded

Contact Moeller service center

Circuit breaker makes no attempt to close with either local

(manual) or remote controls; springs do not discharge

Closing spring not fully charged (check SPRING

CHARGED indicator)

Charge spring manually; check voltage to electrical operator;

replace electrical operator if faulty

If equipped with undervoltage release, undervoltage release

is not energized or is faulty

Unplug undervoltage release from mounting deck and retry

closing operation; if OK, check release (>85%); replace

undervoltage release if faulty

Circuit breaker locked in OPEN position

Check reason for lock

Drawout position interlock is operating; levering screw

Make sure that circuit breaker is at a position that permits

closure; door is

open

and check that shutter (door) over the

levering screw is fully closed

Circuit breaker interlocked with another circuit breaker

or device

Check for presence of an interlocking scheme (cable interlock

or key interlock); check to see if interlocked circuit breaker

is CLOSED

Circuit breaker cannot be closed remotely

(can be closed locally)

Spring release (closing) coil supply voltage low or spring

release faulty

Check power supply voltage; replace spring release if faulty

Secondary contact wiring problem

Make sure electrical pin and socket connectors are properly

seated in molded plug. Verify proper wiring

Spring release closing coil signal blocked

Clear Digitrip 1150 relay contact

Circuit breaker cannot be closed locally

(but can be closed remotely)

Opening and/or closing pushbuttons locked

Check reason for lock

Circuit breaker does not recharge electrically but will

recharge manually

Charging motor supply voltage absent or too low (<85%)

Check charging motor electrical circuit voltage

(check under load)

Charging motor faulty

Replace charging motor assembly

Drawout circuit breaker will not lever-in

Circuit breaker will not fully enter cell (cell rejection

code plate)

Circuit breaker ratings do not correspond to the

cassette requirements

Levering-in screw not in fully DISCONNECT position

at insertion

Rotate levering-in screw counterclockwise to DISCONNECT

position, then insert breaker fully into cassette

Levering-in screw in DISCONNECT position but not pushed

in far enough

Push circuit breaker in as far it will go, cover should be flush

with front of cassette side plate

Protective boots covering stationary disconnects

Remove boots

Shutter jammed or locked

Clear problem

Содержание IZM20

Страница 1: ...e covered in individual instruction leaflets specific to the accessory This information is also available from the Moeller Web site at www moeller net de support For application information consult Moeller or see applicable Product Guides Technical Documents Application Publications and or Industry Standards Safety All safety codes safety standards and or regulations must be strictly observed in t...

Страница 2: ...drawout circuit breaker 11 Fixed circuit breaker 14 Circuit breaker operation 15 Section 3 Circuit breaker description and operation 16 Introduction 16 Basic circuit breaker assembly 20 Pole units 20 Operating mechanism 21 Arc chambers 22 Electronic tripping system 23 Secondary contacts and connection diagrams 26 Accessory devices 34 Section 4 Drawout circuit breaker and cassette 40 General 40 Dra...

Страница 3: ...sing Spring 22 Figure 25 Cross Section of Conductor and Arc Control System 22 Figure 26 Integral Arc Runner Viewed From Top of Arc Chamber Arc Chute Removed Circuit Breaker Closed 23 Figure 27 IZM Arc Plate Assembly 23 Figure 28 Pictorial Diagram of Typical Current Sensing Processing and Tripping System 24 Figure 29 Digitrip RMS 1150 Programmable Trip Unit Installed in IZM Circuit Breaker 25 Figur...

Страница 4: ...s Mounted on Cassette 38 Figure 60 Door Escutcheon and Gasket 39 Figure 61 Cassette Mounted Two Way Cable Interlock 39 Figure 62 Drawout Circuit Breaker in Cassette 40 Figure 63 Drawout Circuit Breaker with Automatic Primary Disconnects 40 Figure 64 Drawout Cassette Features Front and Rear Views 41 Figure 65 Fixed Circuit Breaker with Available Vertical Adapter 42 Figure 66 IZM Nameplate Informati...

Страница 5: ...aker Weights 10 Table 3 Rejection Interlock Pin Locations 12 Table 4 IZM Digitrip Trip Units 24 Table 5 IZM Current Sensors and Matching Rating Plugs 25 Table 6 Shunt Trip Ratings 34 Table 7 Spring Release Ratings 35 Table 8 Undervoltage Release 35 Table 9 Auxiliary Switch Overcurrent Trip Switch and Cell Switch Contact Ratings 35 Table 10 Motor Operator 37 Table 11 Inspection Frequency 43 Table 1...

Страница 6: ...c tracking resistance The drawout IZM circuit breaker is a through the door design having three breaker positions with the compartment door closed CONNECT TEST DISCONNECT and one position out of its compartment on extension rails REMOVE The operating mechanism is a two step stored energy mechanism either manually or electrically operated When withdrawn on captive compartment cassette extension rai...

Страница 7: ...eaker not IZM99 or IZM63 Figure 2 Typical IZM Nameplate m warning TYPE IZM CIRCUIT BREAKERS ARE ROBUST AND are PROVIDED WITH SAFETY FEATURES NEVERTHELESS THE VOLTAGES CURRENTS AND POWER LEVELS AVAILABLE IN AND AROUND THIS EQUIPMENT WHEN IT IS IN OPERATION ARE EXTREMELY DANGEROUS AND COULD BE FATAL UNDER NO CIRCUMSTANCES SHOULD INTERLOCKS AND OTHER SAFETY FEATURES BE MADE INOPERATIVE AS THIS MAY RE...

Страница 8: ...specting circuit breakers and their associated assembly a qualified person should also be trained with respect to the hazards inherent to working with electricity and the proper way to perform such work The individual should be able to de energize clear and tag circuits in accordance with established safety practices Other publications and documentation In addition to this instruction manual other...

Страница 9: ...n a cassette first remove the breaker from the cassette using the levering mechanism and drawout rails After the breaker is removed the machine screws passing through the floorpan can be removed On fixed breakers remove the lag screws passing through the mounting feet that hold the breaker to the pallet Circuit breakers are designed to be easily lifted from the wooden pallet using an appropriate l...

Страница 10: ...8 IZM20N 08 43 00 54 00 48 00 62 00 IZM93N 10 IZM20N 10 43 00 54 00 48 00 62 00 IZM93N 12 IZM20N 12 43 00 54 00 48 00 62 00 IZM93N 16 IZM20N 16 43 00 54 00 48 00 62 00 IZM93N 20 IZM20N 20 43 00 54 00 48 00 62 00 IZM97B 08 IZM32B 08 58 00 72 00 70 00 88 00 IZM97B 10 IZM32B 10 58 00 72 00 70 00 88 00 IZM97B 12 IZM32B 12 58 00 72 00 70 00 88 00 IZM97B 16 IZM32B 16 58 00 72 00 70 00 88 00 IZM97B 20 IZ...

Страница 11: ...hed the rejection pins will block the insertion of the circuit breaker into the cassette before the levering in mechanism is engaged Molded Rail Supports Extension Rail Cutout Before attempting to push the circuit breaker into the DISCONNECT position compare the positioning of rejection interlock pins in the cassette with Table 3 and Figure 6 and the information supplied on the circuit breaker s n...

Страница 12: ... TEST Figure 9 CONNECT Figure 10 The REMOVE position is a position outside the compartment on the cassette s drawout rails where the circuit breaker is not engaged with the levering mechanism The DISCONNECT TEST and CONNECT positions are reached by means of the levering mechanism With the breaker solidly positioned on the cassette s extension rails and levering in mechanism in the DISCONNECT posit...

Страница 13: ...Connection Made Breaker Still Behind Door Typical Storage Position Circuit Breaker Side View Compartment Front Door Secondary Connection Made Rear of Compartment Primary Connections Not Made Breaker and Trip Unit Testing Primary Connection Not Made Secondary and Ground Connections Made Circuit Breaker Side View Compartment Front Door Secondary Connection Made Rear of Compartment Primary Connection...

Страница 14: ...maged To remove the circuit breaker from its compartment follow the procedure just described using a counterclockwise ratcheting motion m notice The circuit breaker mechanism is interlocked such that charged closing springs are automatically discharged if the circuit breaker is levered into or out of the cell Discharge takes place between the DISCONNECT and TEST position Figure 12 Levering Positio...

Страница 15: ... that the panel on which a fixed circuit breaker is to be mounted is capable of supporting the weight Circuit breaker operation Circuit breakers should be operated manually and or electrically before they are put into service This can be done during the installation process or some later date prior to startup To check circuit breaker operation follow the operational procedures outlined in Section ...

Страница 16: ...t breakers utilize six or eight sets of rear primary connections these circuit breakers are available from the factory with several different phase sequences The phase sequence is also labeled on the rear of the circuit breaker Figure 16 For drawout breakers phase sequence labels are also supplied with the cassette and must be applied by the switchgear builder Circuit breakers with different phase...

Страница 17: ...Circuit Breaker Features Front and Rear Views 6 1 Baffled Arc Chute Cover 2 Secondary Disconnect 3 Faceplate front cover 4 Integral Lifting Handle 5 Fixed Horizontal Primary Terminal 6 Fixed Primary Terminal with optional vertical adapter 7 Arc Chamber 8 Sensor Rating Viewing Window 9 Mounting Foot 10 Circuit Breaker Nameplate 11 Tripper Bar 4 11 9 3 10 2 1 1 4 7 5 8 9 ...

Страница 18: ...9 Standard Frame Fixed Circuit Breaker Features Front and Rear Views 1 Baffled Arc Chute Cover 2 Secondary Contact Connector 3 Faceplate front cover 4 Integral Lifting Handle 5 Fixed Vertical Primary Terminals with optional vertical adapter 6 Arc Chamber 7 Mounting Foot 8 Circuit Breaker Nameplate 9 Phase Identification Labels 10 Tripper Bar 1 4 10 7 8 3 1 10 7 2 4 9 9 9 9 5 6 ...

Страница 19: ...l OFF Button push 8 Manual ON Button push 9 Manual Charge Handle 10 Optional Operation Counter 11 Padlockable Levering Device Access Door for Drawout Breaker 12 Color Coded Breaker Position Indicator 13 Nameplate 14 Trip Unit Test Port 15 Trip Unit Cover with Two Mounting Screws mounting screws will accept customer supplied lead security meter seals 1 OPEN PUSH OFF DISCHARGED PUSH ON CLOSED CHARGE...

Страница 20: ...ortion and a fixed portion The exact design configuration depends upon the breaker s frame size IZM63 and IZM99 circuit breakers use two pole units and arc chute assemblies connected mechanically and electrically in parallel to form each phase Primary moving contacts Depending upon the frame size each primary moving contact assembly is comprised of multiple individual copper contact fingers connec...

Страница 21: ...mains available after a closing operation Figure 23 Electrically Operated Drawout Circuit Breaker with Front Cover Removed Manual operation On manually operated circuit breakers the closing spring can only be charged manually To manually charge the spring insert one finger in the recess behind the charging handle and pull out This permits a gloved hand to grasp the handle and begin charging It tak...

Страница 22: ... also available to trip open an electrically operated circuit breaker Refer to Accessory devices on page 34 for more details on both standard and optional devices Electrical Motor Operator Anti pump feature The IZM circuit breaker has both mechanical and electrical anti pump features If the circuit breaker is closed on a fault condition and trips open while the CLOSE signal is maintained using eit...

Страница 23: ...re 27 IZM Arc Plate Assembly Arc chute components are assembled in an insulating jacket that is removable from the top of the circuit breaker as previously described in Lifting circuit breaker on page 9 Each arc chute has a baffled top cover Electronic tripping system The IZM circuit breaker uses a three part tripping system Figure 28 Microprocessor based trip unit Current sensors Trip actuator Al...

Страница 24: ...ent curves to coordinate with a load or system refer to the trip unit instruction book Microprocessor based trip unit IZM circuit breakers use any one of a family of DigitripE RMS trip units whose main features are summarized in Table 4 Table 4 IZM Digitrip Trip Units Functions 520Li 520i 520Mi 520MCi 1150i LSIG protection No Yes Yes Yes Yes Disable I No Yes Yes Yes Yes GF protection No Yes Yes Ye...

Страница 25: ...level by sensor rating If the rating plug is removed from the trip unit the circuit breaker will trip if it is carrying current Make certain the rating plug is secured in position with its retaining screw Do not torque the retaining screw beyond 0 1 Nm Refer to Table 5 for a tabulation of the available rating plugs Current sensors Three toroidally wound current sensors are installed at the rear of...

Страница 26: ...t a peak instantaneous current of 25 x In this corresponds to an rms current of 11 x In with maximum asymmetry The making current release is enabled only for the first two cycles following a circuit breaker closing operation The making current release will trip the circuit breaker instantaneously release the mechanical pop out indicator and flash the instantaneous LED trip indicator if so equipped...

Страница 27: ...thout terminal block If a terminal block for customer use is not required the circuit breaker is supplied with both plug in connectors male and female just described in the two previous paragraphs The plug in connectors are joined and attached to the top portion of the circuit breaker The customer can plug secondary wiring with crimp on connectors into the back of the plug in connectors subsequent...

Страница 28: ... release the closing pulse will occur when the mechanism is charged and reset LCS open Voltage must be removed and reapplied to the spring release for subsequent operation 6 To provide selected time delays for short time and or ground time functions for testing or non zone interlocking applications a jumper from B 8 to B 9 is required 7 On three pole breakers only having ground fault functionality...

Страница 29: ... time delays for short time and or ground time functions for testing or non zone interlocking applications a jumper from b 8 to b 9 is required 5 On three pole breakers only having ground fault functionality a jumper installed from b 6 to b 7 will enable source ground fault sensing and disable residual ground fault sensing Inputs b 4 and b 5 will be reassigned for source ground sensor inputs 6 Nor...

Страница 30: ...ase pulse is initiated If voltage is maintained to the spring release the closing pulse will occur when the mechanism is charged and reset LCS open Voltage must be removed and reapplied to the spring release for subsequent operation 6 To provide selected time delays for short time and or ground time functions for testing or non zone interlocking applications a jumper from B 8 to B 9 is required 7 ...

Страница 31: ...ase pulse is initiated If voltage is maintained to the spring release the closing pulse will occur when the mechanism is charged and reset LCS open Voltage must be removed and reapplied to the spring release for subsequent operation 6 To provide selected time delays for short time and or ground time functions for testing or non zone interlocking applications a jumper from B 8 to B 9 is required 7 ...

Страница 32: ... If voltage is maintained to the spring release the closing pulse will occur when the mechanism is charged and reset LCS open Voltage must be removed and reapplied to the spring release for subsequent operation 4 To provide selected time delays for short time and or ground time functions for testing or non zone interlocking applications a jumper from B 8 to B 9 is required 5 Three wire crimp if hi...

Страница 33: ... If voltage is maintained to the spring release the closing pulse will occur when the mechanism is charged and reset LCS open Voltage must be removed and reapplied to the spring release for subsequent operation 4 To provide selected time delays for short time and or ground time functions for testing or non zone interlocking applications a jumper from B 8 to B 9 is required 5 Three wire crimp if hi...

Страница 34: ...e mounted on a IZM circuit breaker Table 6 Shunt Trip Ratings Control Voltages Operational Voltage Range 70 100 Inrush Power Consumption a Opening Time ms 24 Vdc 17 26 Vdc 250W 35 48 Vdc 34 53 Vdc 250W 35 110 125 Vdc 77 138 Vdc 450W 35 220 250 Vdc 154 275 Vdc 450W 35 110 127 Vdc 77 140 Vdc 450W 35 208 240 Vdc 146 264 Vdc 450W 35 a Required for less than 35 ms Figure 43 Through the Window Electrica...

Страница 35: ...providing remote electrical indication if the circuit breaker is open or closed Figure 49 Up to three auxiliary switches can be mounted in the circuit breaker Each switch has two normally open a and two normally closed b contacts for a total of 12 available contacts Table 1 Table 8 Undervoltage Release Control Voltages Operational Voltage Range 85 110 Dropout Volts 30 60 Inrush Continuous Power Co...

Страница 36: ...o an overcurrent condition Opening as a result of a circuit breaker s manual open button shunt trip or undervoltage release does not cause the overcurrent trip switch to operate The overcurrent trip switch has 2a 2b Form C contacts Table 9 The status of the contacts changes when the trip indicator pops out This permits the switch to be used as an alarm or in conjunction with a spring release to bl...

Страница 37: ...ewed through the front cover Figure 53 The customer supplies the key lock The provisions available are for Kirk Castell Ronis or CES Figure 53 Cover Mounted Key Lock and Operations Counter Cassette lock A cassette mounted lock can be used in conjunction with different interlocking schemes such as main tie main Figure 54 The lock holds the circuit breaker trip free in the connected position prevent...

Страница 38: ...breaker is levered from the CONNECT position the shutters automatically close to cover the fixed primary contacts Figure 56 When the circuit breaker is levered into the cassette the shutters automatically open permitting primary connections to be made Figure 57 Figure 56 Safety Shutters in Closed Position Figure 57 Safety Shutters in Open Position Cassette cell switches The cassette cell switches ...

Страница 39: ...re when others are closed A lever assembly is mounted on each breaker that interfaces with the pole shaft and the tripper bar The lever assemblies are interconnected with either cables depending upon the relative orientation of the breakers Cables can be used for any orientation of the breakers Mechanical interlocks are available for both fixed and drawout circuit breakers and in both two way and ...

Страница 40: ...ry interfaces to the drawout circuit breaker including automatic primary and secondary connections For the IEC circuit breaker a cassette style using horizontal stabs and horizontal customer bus bar terminals is available as standard Figure 64 The cassette terminal connections can be adapted to vertical bus bar connections with a variety of optional vertical adapters Mounting locations for cell TO...

Страница 41: ...support Figure 64 Drawout Cassette Features Front and Rear Views Front View Rear View 1 Extension Rails 2 Extension Rail Cutout 3 Secondary Plug in Connectors 4 Secondary Terminal Blocks 5 Arc Hood 6 Optional Cell TOC Switch 7 Optional Key Interlock 8 Earthing Bar 9 Open Safety Shutters 10 Primary Terminals 4 3 6 7 2 1 8 9 2 1 4 5 6 10 7 ...

Страница 42: ...d dimensions associated with all fixed circuit breakers and any appropriate primary bus connections can be found in a separate document The installation of a fixed circuit breaker was discussed in Section 2 If necessary review that information since it will not be repeated here Fixed circuit breaker dimensions The standard fixed circuit breaker is supplied with horizontally mounted primary connect...

Страница 43: ...t the equipment if there are earlier opportunities If possible make a visual inspection each time a circuit breaker compartment door is opened and especially when a circuit breaker is withdrawn on its compartment extension rails This preventive measure could help to avoid future problems Industry standards for this type of equipment recommend a general inspection and lubrication after the number o...

Страница 44: ...test function the Digitrip Test Kit or the hand held IZM Functional Test Kit Review test kit instructions for the trip unit Instruction leaflet Section 1 2 or 1 3 applies for instantaneous test procedures or Paragraph 5 2 1 1150 Self Testing Trip Mode in the trip unit instruction leaflet AWB1230 1608 Charge the breaker mechanism springs either using the charging handle or the motor operator Press ...

Страница 45: ...or each primary contact and indicates whether or not the contact should be replaced Inspection of the contacts using the contact wear indicators is conducted only with the circuit breaker closed Figure 71 m notice When making a contact wear inspection always make the inspection by looking straight down into the arc chamber for the proper perspective Viewing the contact wear area from an angle coul...

Страница 46: ...scribed here do not under ordinary circumstances require any assistance beyond the appropriate instructional material If further assistance is required however contact your Moeller representative Rating plug replacement m notice If a rating plug is not installed in the trip unit the trip unit will trip when energized Also remember that the trip unit s rating plug and the circuit breaker s current ...

Страница 47: ...d vertical adapters must be removed Each primary disconnect finger cluster is removed by loosening the two hex head bolts with a 10 mm wrench These bolts do not have to be completely removed to slide the primary disconnects off of the terminals Remove the vertical adapters next from the circuit breaker terminals by removing the two or three 10 mm bolts holding them in place Figure 74 The current s...

Страница 48: ...ded Contact Moeller service center Circuit breaker makes no attempt to close with either local manual or remote controls springs do not discharge Closing spring not fully charged check SPRING CHARGED indicator Charge spring manually check voltage to electrical operator replace electrical operator if faulty If equipped with undervoltage release undervoltage release is not energized or is faulty Unp...

Страница 49: ...and or typecode is not known it would help to refer to a pictorial and or graphic reference Also include the circuit breaker type General Order number and other information as shown on the nameplate on the front cover of the circuit breaker Figure 2 and Figure 17 Some detailed parts shown in the figures in this manual may only be available as a part of a sub assembly Certain parts may not be avail...

Страница 50: ...50 Operation and maintenance of IZM low voltage air circuit breakers MOELLER www moeller net de support 10 09 AWB1230 1605 Effective October 2009 ...

Страница 51: ...51 10 09 AWB1230 1605 Effective October 2009 Operation and maintenance of IZM low voltage air circuit breakers MOELLER www moeller net de support ...

Страница 52: ...ow voltage air circuit breakers Moeller GmbH Industrieautomation 2009 by Moeller GmbH Änderungen vorbehalten Subject to alterations 10 09 AWB1230 1605EN Z8700 Moon Doku Heng Printed in USA 10 09 10 09 AWB1230 1605 Effective October 2009 ...

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