CAT BUCYRUS Marion 301-M Mining Shovel ELECTRICAL SERVICE MANUAL BI005752 - PDF DOWNLOAD

Technical Manual

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Marion 301-M Mining Shovel ELECTRICAL SERVICE MANUAL - Table of Contents -

30114esc.rn60

This manual is divided into three books. Each book is further divided into major sections covering various systems and their electrical components of the 301-M Mining Shovel. Refer to book 3 of this manual, the Appendix, for vendor instructions and publications.

Book One:

Introduction

Section 1- SYSTEM OVERVIEW

Section 2- EQUIPMENT FAMIUARIZATION

Section 3- SYSTEM COMPONENTS

• MOTION UMITS

• AUTO LUBE

• GROUND FAULT

• MOTION DRIVES

• MOTOR CONTROL CENTER

• PLC TROUBLESHOOTING

• SERIES 6 DATA SHEETS

Section 4- ELECTRICAL SCHEMATICS OVERVIEW

Section 5- MACHINE OPERATION

Section 6- GENERAL TROUBLESHOOTING

Section 7- 301-M ELECTRICAL DRIVE SYSTEM

Section 8- OPERATOR INTERFACE LOADING and ASCII BASIC MODULE LOADING PROCEDURE

Section 9- ELECTRICAL SETTINGS

Book Two:

P.C. No. 211129-2

Section 10 - PLC CONFIGURATION SHEETS, SCHEMATIC

• SCHEMATICS

• CONFIGURATIONS

Section 11 - SERIES 6 DOCUMENTATION

• PROGRAM

Book Three:

P.C. No. 211127-6

P.C. No. 212129-8

P.C. No. 211134-9

• MACHINERY HOUSE OIT, SAMPLE SCREENS

• OPERATOR'S OIT, SAMPLE SCREENS

Marlon 301-M Mining Shovel

ELECTRICAL SERVICE MANUAL

Book 3: APPENDIX

- Table of Contents -

30114esc.1TIllO

This manual is divided into three books. This book contains vendor instructions and publications.

Vendor

RotatingEquipment:

Armored Motors, Type MD800

Direct-Current Motors (Dipper Trip)

AC Polyphase Induction Blower Motors

Control:

G.E. GEH-32581

G.E. GEH-3967M

G.E. GEH-2301 K

High Voltage Control Cabinet Central Electric C4503

Magnetic Relays

General Purpose Contractors

DC Contactor IC2800Y108

DC Contactor IC2800Y1oo

Motor Control Center:

G.E. GEH-1941C

G.E. GEH-1496F

G.E. GEH-751E

, G.E. GEH-3057B

• MCC1 Marion 212116-6

• MCC2 Marion 212117-4

Support Devices:

Instrument Transformers

Meters{Transformers

Dry Type GP Transformers. .................... ..

Dry Type GP Transformers.

Dry Type Control Transformers

Pushbuttons, CR2940 ......................... ..

Illuminated Pushbuttons and Ughts

Relays, Machine Tool

Relays, 1OOV, CR120B

Circuit Breakers, Molded Case

Capacitors

Switchboards

High Voltage Disconnect Switch

Programmable Controller:

Series 6 Plus User's manual

G.E. GEH-230AF

G.E. 4555K1 0-001 G

G.E. GEK-33276B

G.E. GEK-33277C

G.E. GEJ-3775-B

G.E. GEH-1052

G.E. GEJ-2836C

G.E. GEH-2385G

G.E. GEH-4115C

G.E. GET-2779G

G.E. GEH-2743A

G.E. GEH-2621C

G.E. C4625

IMPORTANT NOTE

G.E. GEK-96602A

lnIormllllon lind cIoour'nIIrUtIo

Central Electric

Switchgear Manufacturers

Fulton, Mo. 65251

Transmittal No.: 1

To: FRANK WICKERT MARION DIVISION OF INDRESCO

617 W. CENTER ST MARION OH 43302

614-383-5211

We are sending you:

Please Return Approval By:N/A

Please expedite necessary approvals and notify us immediately if enclosures are not as listed below. Failure to return approval documments by the date shown may result in shipment delay.

Telephone: 314-642-6811

Fax: 314-642-6844

Highway 54 South Po. Box 310

Date: 02/13/95

CEC Shop No. C4625

Cust Po.03769

MARION 301·M MINING SHOVEL

ELECTRICAL SERVICE MANUAL

This manual is divided into major sections covering various systems and their electrical components of the Model 301-M electric mining shovel. This Book, the APPENDIX contains vendor instructions and publications.

Rotating Equipment:

Armored Motors, Type MD800

Dipper Trip Motor

AC Polyphase Induction

Blower Motors

Control:

High Voltage Control Cabinet

Magnetic Relays

General Purpose Contactors

DC Contactor,IC2800Y108

DC Contactor, IC2800Y100

Motor Control Center

Support Devices:

Instrument Transformers

Meters/I nstrumen ts

Dry Type GP Transformers

Dry Type GP Transformers

Dry Type Control Transformers

Pushbuttons, CR2940

Illuminated Push buttons & Lights

Relays - Machine Tool

Relays - 100V, CR120B

Circuit Breakers, Molded Case

Capacitors

Switchboards

High Voltage Disconnect Switch

Programmable Controller:

Series Six Plus - user's manual

GENERAL INFORMATION

This manual is designed to assist the owner in the operation and preventive maintenance of this machine. Following easy to understand step-by-step procedures, maintenance personnel can perform these tasks in a safe manner. When a systematic and thorough maintenance/service procedure (a responsibility of the maintenance superintendent) is used for this machine, minimum unplanned downtime and reliable operation will result.

THIS MANUAL IS NOT THE PARTS BOOK, and cannot be used to order parts. A separate, detailed parts book has been supplied. Please carefully read the instructions in it. All parts are listed by group and/or product code numbers with item/part numbers for THIS SPECIFIC MACHINE. Order parts in exact Quantity. Parts ordered by mistake and returned, are subject to a rehandling charge. RIGHT and LEFT HAND PARTS on the upper frame correspond to the operator's hands at the controls; as seated when operating the machine. Please state the correct machine SERIAL NUMBER (located on a plate in the operator's cab) when corresponding or contacting factory service or parts departments. Records on each machine are filed by serial number and when given this number, your machine's specific design and original equipment is accessed Quickly by the Marion parts representative.

Periodic additions or revisions may be made to this manual. These will be mailed direct to you from the factory. Should you require additional information or factory service assistance contact your regional service representative or

Service Department

Marion Division of INDRESCO Inc.

617 West Center Street

P.O.Box 505 Marion, OH 43302

or Telephone 614/383·5211

Telex 24-5307

Telecopier 614/383·52.11

It is Marion's policy to improve its products whenever possible and practical to do so. The company reserves the right to make changes or add improvements at any time without incurring any obligation to install such changes on machines sold previously.

Due to this continuous program of product research and development some procedures, specifications and parts may be altered in a constant effort to improve machines.

SAFETY ALERT SYMBOLS,

AThis safety alert symbol is used here and throughout this manual to call your attention to instructions concerning your personal safety. Carefully read and follow these instructions and observe all SAFETY, DANGER, and CAUTION graphics mounted on various areas of the machine.

Be certain anyone servicing this machine is aware of these SAFETY SYMBOLS and their definition. In the event you Question your ability to safely perform any of the enclosed maintenance and operational procedures contact your regional Marion service representative or the factory.

The following defines distinctions between safety instructions. In all these definitions the safety alert signal is used.

ADANGER: ACAUTION:

Denotes extreme intrinsic hazard which exists and could result in high probability of death or irreparable injury if proper precautions are ignored.

Denotes a reminder of safety practices or directs attention to unsafe practices which could result in personal injury if proper precautions are ignored.

An example of a safety alert symbol and special instructions is shown below.

Inherent danger exists in the operation of any high voltage electrical equipment. A safe grounding system includes ground conductors in the power cable, a neutral grounding resistor, and related relays and switch-gear. A ground continuity check system is required by law in many parts of the world.

Operating, maintaining or servicing this machine is dangerous unless performed properly. Each person must satisfy himself and his employer that he is alert, has the necessary skill, knowledge, proper tools and equipment, and that all the methods used are safe and correct. Factory service representatives and specialists are available to provide additional information or technical assistance.

The operator must be alert, physically fit, and free from the influence of alcohol, drugs, or medications that might effect his eyesight, hearing or reactions.

Safety must always be the most important concern. Consult your supervisor when safety is in doubt.

SAFETY PRECAUTIONS

The owner and/or operator must replace any and all safety and warning product graphics if they are defaced or removed from the machine.

Before doing any work on the machine, a qualified electrician must lock out or remove the electric power supply from the machine and tag it so personnel are aware that someone is working on the machine.

Do not start an engine indoors unless adequate exhaust ventilators are provided. Once an engine is running, move the machine outdoors as soon as possible.

Keep hands, feet, and clothing away from rotating parts.

Do not move or operate the machine without knowing the location and purpose of al/ personnel, plus test or support equipment, in or near the machine.

Think before you act. Carelessness is one luxury the service man cannot afford.

Do not wear rings, wrist watches or loose fitting clothing when working on machinery. They could catch on moving parts causing serious injury. Never adjust and/or service a machine in bare feet, sandals or sneakers.

Always wear safety glasses when using a hammer, chisel or other tools that may cause chips to fly.

Excessive or repeated skin contact with sealants or solvents may cause skin irritation. In case of skin contact, remove sealant or solvent promptly by washing with soap and water.

Never utilize the machine air or hydraulic systems for support when working on the machine. Deactivate and isolate the system prior to performing maintenance.

Equipment should be parked on level ground at all times during machine servicing and periods of idleness.

Cranes and hoists must be of sufficient capacity to lift the heavier components (gear cases, dipper/bucket, boom, etc.) and have an ample safety margin.

Be sure heavy items are properly supported from cranes or hoists before removing supporting members from machine.

Have sufficient service personnel available when removing or installing large heavy items to maintain control at all times.

Always use safety stands in conjunction with hydraulic jacks or hoists. Do not rely on the jacK or hoist to carry the load, they could fail.

Use safety catch on all hoist hooks. Do not take a chance, the load could slip off of the hook.

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If a heavy item begins to fall, let it fall, don't try to catch it.

When disassembling machine. be sure to use safety stands and adequate cribbing to prevent tipping or rollover of components.

Keep work area organized and clean. Wipe up oil or spills of any kind. Keep tools and parts off of the ground. Eliminate the possibility of a fall which could result in serious injury.

Floors. walkways and stairways must be clean and dry. After draining operations be sure all spillage is cleaned up. Electrical cords and wet metal floors make a dangerous combination.

Check all wire ropes for telltale signs of early wear or failure. look for and secure any loose bolts or locking devices.

Use extreme caution while working near any electrical lines or equipment whether it be high or low voltage. Never attempt electrical repairs unless qualified. Check limit switches for proper operation.

When using an acetylene torch. always wear welding goggles and gloves. Keep a "charged" fire extinguisher within reach. Be sure the acetylene and oxygen tanks are separated by a metal shield and are chained to the cart. Do not weld or heat areas near transformers or electrical cabinets and utilize proper shielding around lubrication lines.

Use pullers to remove bearings. bushings. gears. cylinder sleeves. etc. when applicable. Use hammers. punches and chisels only when absolutely necessary. Then. be sure to wear safety glasses.

Be careful when using compressed air to dry parts. Use approved air blow guns. do not exceed 30 psi (207 kPa). wear safety glasses or goggles and use proper shielding to protect everyone in the work area.

Be sure to promptly reinstall safety devices. guards or shields after adjusting and/or servicing the machine.

After servicing. be sure all tools. parts or equipment are removed from the machine. or secured in an appropriate storage area.

Protective eye goggles should be worn at all times when working on the air conditioning system. Work on the air-conditioning system only in a well ventilated area.

Wipe away excess lubricants around bearings and gears. Never lubricate parts in motion.

Operate machine on level ground and be constantly aware of swing clearance. Never hold a load longer than needed in the dump cycle. Use swing brakes only when machine is stopped. iv

FIRE PREVENTION

Always have a "charged" fire extinguisher on hand and know ho-w to use it. Inspect and service the extinguisher as indicated on its instruction plate.

DO NOT smoke while handling flammables or when near batteries. Inspect all lines, tubes, and hoses carefully. Tighten all connections to the recommended torque. See the Visual Inspection Schedule for the walk around inspection procedure.

loose or damaged lines, tubes, and hoses, which leak, can cause a fire.

Make certain. that all clamps, guards, and shields are replaced correctly so as to prevent vibration and the rubbing of one part against another which might result in heat build-up during operation.

DO NOT carry flammable fluids such as gasoline or solvents on board the machine.

DO NOT over-bend or strike pressurized hose lines. DO NOT install bent or damaged lines, tubes, or hoses. Replace them with new immediately.

DO NOT start the machine or move any of the controls if a warning tag is attached to the controls or the start panel.

Keep all cleaning rags properly stored. DO NOT discard them into a pile on board.

Keep all structural frame compartments, walkways, and work areas clean and free of lubricant residue.

NEVER weld, burn, or perform service on the machine alone.

If a motor or other component is running hot, shutdown the machine until it has cooled and/or the cause eliminated.

TRAINING

Qualified maintenance personnel using a scheduled maintenance program are the best way to minimize machine downtime -and maximize productivity of equipment.

Marion offers factory and mine site maintenance seminars and special familiarization programs for mechanics, oilers, electricians and operators on a fee basis. -

These programs are presented by qualified factory specialists and service technicians. Special customized training programs can also be developed to meet specific mine requirements.

Objectives of training and training materials are to provide the means for developing and maintaining on-site service repair capability.

For further information about Marion service training capabilities and programs contact:

Customer Service Department

Marion Division of INDRESCO Inc.

S17 West Center St.

P.O.Box 505 Marion, OH 43302

REPAIRIS.PARE PARTS WARRANTY

Marion Division of INDRESCO Inc. warrants that its products, when shipped, for a period of six (6) months from the date of delivery, F.O.B. point of shipment, will meet applicable, agreed specifications, if any with respect thereto, and will be free from defects in material and workmanship, provided that the Marion products sold are properly stored, assembled, used and maintained. Products not manufacturedby Marion shall be subject only to such warranty as may be made by the manufacturer thereof. All claims under this warranty must be made in writing immediately upon discovery. THE FOREGOING IS EXPRESSLY IN LJEUOFAll OTHER WARRANTIES WHATSOEVER, EXPRESS, IMPLIED AND STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.

Should any failure of the Marion products to conform to this warranty appear within the limited time period set forth above, Marion shall, upon Buyer's submission of a claim as provided above, either 1) repair or replace, F.O.B. point of shipment, any nonconforming part or parts of Marion's products which have been retI,Jrned to it for examination, transportation prepaid, or otherwise examined by Marion, and which examination discloses the nonconformity to Marion's satisfaction; or 2) refund an equitable portion of the purchase price.

THEFOREGOING IS MARION'S ONLY OBLIGATION AND BUYER'S EXCLUSIVELY REMEDY FOR BREACH OF WARRANTIES AND, EXCEPT FOR GROSS NEGLIGENCE, WILLFUL MISCONDUCT, OR REMEDIES PERMITTED UNDER THE PERFORMANCE, INSPECTION, AND ACCEPTANCE CLAUSE OF MARION'S TERMS AND CONDITIONS, THE FOREGOING IS BUYER'S EXCLUSIVE REMEDY AGAINST MARION FOR ALL CLAIMS ARISING WITH RESPECT TO MARION PRODUCTS OR RELATING THERETO, WHETHER SUCH CLAIMS ARE BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE AND STRICT LIABILITY) OR OTHER THEORIES. BUYER'S FAilURE TO SUBMIT A CLAIM AS PROVIDED ABOVE SHALL SPECIFICALLY WAIVE ALL CLAIMS FOR DAMAGES OR OTHER RELIEF, INCLUDING, BUT NOT LIMITED TO, CLAIMS BASED ON LATENT DEFECTS.

IN NO EVENT (INCLUDING, BUT NOT LIMITED TO, AVOIDANCE OF THE ABQVE LIMITED WARRANTIES AND REMEDIES) SHALL BUYER BE ENTITLED TO ANY INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER ARISING FROM LATE PERFORMANCE OR A FAILURE TO PERFORM, DEFICIENCIES OR NEGLIGENCE IN THE DESIGN, MANUFACTURE, SALE DELIVERY OR ASSEMBLY OF MARION PRODUCTS OR FAILURE OF MARION PRODUCTS OR fROM ANY CAUSE WHATSOEVER AND WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE AND STRICT LIABILITY) OR OTHER THEORIES. ANY ACTION BY BUYER ARISING WITH RESPECT TO MARION PRODUCTS OR RELATING THERETO MUST BE COMMENCED WITH ONE (1) YEAR AFTER THE CAUSE OF ACTION ACCRUES OR IT SHALL BE BARRED.

SECTION 1.

SYSTEM OVERVIEW

SYSTEM DESCRIPTION

The 301·M mining shovel is equipped with a totally static, variable voltage, D.C. control sys1em that can convert and invert A.C. Power to control D.C. Motors. The shovel control system consists of the hoistjR.H. propel, crowd/ LH. propel, and swing motions. The right hand propel motion shares the hoist electrical system, while the left hand propel motion shares the crowd electrical system. The swing function remains fully active during propel.

When motion drive power is required, controlled gating of thyristors converts A.C. voltage into variable voltage D.C. This controlled D.C. controls the speed of and limits the current to the drive motors.

When motion plugging occurs, the D.C. diive motors act as generators. During these periods, the mechanical energy is conver.ed in10 elec1rical energy, which is inverted back 10 A.C. by 1he thyristor bridge netl'.'OiKS, to the power network.

Refer to the block diagram of this electrical system on page 1-7, the one line diagram of it on page 1-8, and the machine's deck plan on page 1-9. These \"orill assist YOI:J to understand the system. Following are descnptions of the major components in the drive.

ELECTRICAL SYSTEM OUTLINE

• 7.2 KV, 3 Phase, 60 Hertz Supply Voltage (via trail cable).

• 480 Volt AC Auxiliary Voltage.

• 2063 K:VA Main Transformer.

• 250 K:VA Dry Auxiliary Transformer.

• D.C. Static Power Conversion provides operation under + 15% voltage fluctuation using 3 leg, bridge converters.

• 77mm cell technology used on all motion drives.

• Reactive Power Compensator to regulate power factor.

• Self·diagnostics with L.E.D.'s on cabinets.

• Protective monitoring to assist operator.

• Auto Lube Programmable Controls.

• Programmable Motion Umit Controls.

• Main and Auxiliary Collector Rings placed on the machinery deck for maintenance ease.

TRAIL CABLE JUNCTION BOX

High voltage power, in the trail cable, is at1ached to the machine at the Trail Cable Junction box.

COLlECTOR RINGS

The collector rings transfer electrical power from the lower frame to the rotating upper frame. The whole collector ring assembly is mounted above the upper frame deck at the center journal for easier maintenance.

HIGH VOLTAGE CABINET

This cabinet is the high voltage distribution and control center for the upper frame. There are three sections of this cabinet:

• High voltage control cabinet.

• Vacuum contactor cabinet.

• Auxiliary fused • disconnect cabinet.

The control cabinet contains AC. volt and amp meters, electronic devices that monitor the primary and secondary of the main transformer, an under·voltage release device, fuses, transformers, and relays. For further detail, see High Voltage Cabinet in the system component section. The vacuum contactor cabinet contains the vacuum contact or, the high voltage potential and current transformers for the electronic protection relay, and the drive bus surge arresters and surge capacitors. The auxiliary fused disconnect cabinet contains the high voltage surge arresters and the auxiliary transformer fused disconnect.

AUXIUARY TRANSFORMER (T2)

The auxiliary transfonner is rated at 225 KVA with a 7.2 KV WYE primary and a 480V DELTA secondary.

:GROUND FAULT MONITOR

The mining shovel has several ground fault S}/slems.

The initial ground monitoring is done at the mine substation. which checks the continuity of a ground check wire (GC). The ground check wire runs through a series of door switches on the lower frame disconnect box, the high voltage collector rings, and the high voltage cabinet to the emergency stop bUi1ons, and then to machine ground. If any of these door swi1ches are opened, or if the continuity of the ground check loop is lost, then the substation should trip. See Sht. 2A of the electrical schematic for this circuit.

Other ground fault monitoring on the machine is as follows:

• High ground fault is monitored by the Lod Trak Electronic Protection Relay on the high voltage control cabinet door.

• A.C. Drive b::s, at:xi!1ary bl,;s, a:"ld lighj;'jg bus ground faults are monitored at 1.1e ground fat:lt cabinet. on ti"le cen:er, rear hOl,;se wall of the ballast bcx.

• Each of oilve packages, including the recc'.jve power compensator, has a ground It '4 1-.·1t • 4 01-. • I'" (S-l')'" t' G" - I ". I .au. mO:"ll.or w, 1;"'10 ,e sIgna ;JeCUorIlCS mooule C VI • .::>ee ne .c. e ecmoa manual for more detail.

NOTE: All on board ground fault trips will be annunciated in the operator's cab and on the auxiliary cabinet door for troubleshooting ease. These trips do not necessarily shut the machine down but can if the jumper is removed from relay GF?.AX. See Sht. 5A of the electrical schematic.

MOTOR -CONTROL CENTER NO.1 (MCC')

MCCI contains the machine starting panel and the circuit breakers that feed the drive control power, motor field motor blowers, power conversion modules (?CM) fans, and the dipper trip. For more detail, see the system components section.

MOTOR CONTROL CENTER NO.2 (MCC2)

MCC2 contains circuit breakers for the auxiliary loaes, such as the air compressor, filter fans, hoist cable winch, air conditioner. anti-condensation heaters, and the phase sequence relay. For more detail see the components section.

MAIN TRANSFORMER (TI)

The main transformer is rated at 2063 KVA with 7.2 KV WYE primary and a 600 V delta secondary. Thermal over temperature devices are provided for protection. Over temperature warning is annunciated in the operators cab and on the auxiliary cabinet door.

CAPACITOR SWITCHBOARD

The capacitor switchboard. located on the left side of the ballast box. contains four 800 amp circuit breakers, one eachof the four capacitor cabinets on the left wing. If the breakers overload or trip, the trip will be annunciated in the operator's cab and on the auxiliary cabinet door.

NOTE: All harmonic cabinets are required to operate the machine.

CAPACITOR CABINETS WITH HARMONIC FILTERS

There are four capacitor cabinets located on the left wing. Each cabinet contains three capacitors and three reactors which produce a leading power factor and harmonic filtering. The reactors in three of the cabinets are sized for 5th ha'rmonic filtering, and the reactor in the fourth cabinet is sized for 7th harmonic filtering.

MAIN BUS FILTER CAPACITORS

The main bus filter capacitors are located in the hoist cabinet. These capacitors help filter the regeneration voltage.

RPC CONVERTER AND CONTROL MODULES

The reactive power compensator converter and control modules are located ·on the left wing. The converter contains a three phase, force commutated bridge network that can produce leading or lagging vars. The control cabinet contains the monnors and control electronics. The 600 V drive bus volt and amp meter, RPC vars meter, load vars meter, load watts meter vars on indicating light, fault reset button, and fault monitor are mounted on the control cabinet door. Converters and controls are covered in the G.E. service manual.

RPC LOAD REACTOR

The reactive power compensator load reactor is located on the left side of the ballast box. This reactor provides a current path for the DC circuit of the RPC bridge.

HOIST CROWD AND SWING LINE REACTORS

The hoist, crcwd, and s..-.l"g line reactors are located on the right side of the ballast bcx. There are three Oi,e on each phase, in the crowd and swing reactor enclosures. There are six readors, 1'No in parallel on each phase, in the hoist reactor enclosure. All of these reactors limit the current rate of change to their respective drives in the event of a converter fault. They also do some filtering.

HOIST, CROWD, AND SWING CONVERTERS (PCM) AND CONTROLlERS

The drive converters 2nd controllers are located on the right wing. The converters produce variable voltage D.C. through a three Jegged bridge configuration with reversing thyristors. The control cabinets have field and armature amp meters, D. C. volt meters, converter reset buttons, and fault finders mounted on their doors. There are also windows in the control cabinet doors for viewing the regulator and converter See the G.E. service manual for more detail.

HOIST CONTACTOR AND DYNAMIC BRAKE (DB) MODULE

The hoist contactor and DB module is located on the right Wing. A propel loop contactor is also located in this cabinet since the hoist converter can drive either the right hand propel motor or the hoist motor. The hoist and propel DB contaciors simply shunt a remote mounted DB resistor across the motor armature during an emergency stop situation. Motor loop current shunts, D8 and contactor auxiliary relays, and some DB and contacior control relays are also located in this cabinet. See the G.E. service manual for more information.

CROWD CONTACTOR AND BRAKE (DB) MODULE

The crowd contactor and DB module is located on the right wing. A propel loop contac1or is also located in this cabinet since the crowd converter can drive either the crowd motors or the left hand propel motor. The O.B. contactors simply shunt a remote mounted D.B. "resistor across the motors in an emergency stop situation. Motor loop current shunts and some control relays are also located in this cabinet. See the G.E. service manual for more detail.

SWING CONTACTOR AND DYNAMIC BRAKE (DB) MODULE

The swing contactor and DB module is located on the right wing. The swing loop contactor connects the swing motors to the converter and the DS contactor shunts a remote mounted DB resistor across the motor in an emergency stop situation. See the G.E. service manual for more detail.

OYerJUncler Voltage

Hoist Field Exciter

Swi!'l;/

Crowd

Dipper Trip Bridge

Hoist

Swing

Crowd

Hoist

Crowd

Circuit

Weld

Hoist

Ceb

Anti-Condensation

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