AC Water Cooled Mine Motors

(Armored Face Conveyor/Stage Loader/Crusher)

4/15

Installation & Operating Manual

MN405

Any trademarks used in this manual are the property of their respective owners.

Important:

Be sure to check www.baldor.com to download the latest version of this manual in Adobe Acrobat PDF format.

MN405

Table of Contents

Section 1

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−1

Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−1

Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2

Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2

EX Equipment Marking and Acceptance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−3

EMC Compliance Statement for European Union . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−4

Section 2

Installation & Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1

Conduit Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−2

AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−2

Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−2

DC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−2

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−3

Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−4

First Time Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−6

Initial Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−6

Test for General Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Coupled Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Jogging and Repeated Starts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Hazardous Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Protection Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−7

Repair of Motors used in Hazardous Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−8

Section 3

Maintenance & Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1

General Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1

Maintenance DC Motors Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1

Relubrication & Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1

Type of Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1

Relubrication Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1

Relubrication Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−2

Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−3 i

ii MN405

Section 1

General Information

Overview

WARNING:

WARNING:

WARNING:

WARNING:

WARNING:

WARNING:

WARNING:

WARNING:

WARNING:

WARNING:

This manual contains general procedures that apply to Baldor Motor products. Be sure to read and understand the Safety Notice statements in this manual. For your protection, do not install, operate or attempt to perform maintenance procedures until you understand the Warning and Caution statements.

A Warning statement indicates a possible unsafe condition that can cause harm to personnel.

A Caution statement indicates a condition that can cause damage to equipment.

Baldor mining motors are sold to OEM (Original Equipment Manufacturers) companies who provide motors and equipment containing these motors as their product offerings. Be sure to consult the OEM documents for safety and regulatory information that is important to the application of these products.

Important:

Safety Notice:

This instruction manual is not intended to include a comprehensive listing of all details for all procedures required for installation, operation and maintenance. This manual describes general guidelines that apply to most of the motor products shipped by Baldor. If you have a question about a procedure or are uncertain about any detail, Do Not Proceed. Please contact your OEM for more information or clarification.

Before you install, operate or perform maintenance, become familiar with the following:

• IEC 34−1 Electrical and IEC72−1 Mechanical specifications.

WARNING:

WARNING:

WARNING:

WARNING:

This equipment contains high voltage! Electrical shock can cause serious or fatal injury.

Only qualified personnel should attempt installation, operation and maintenance of electrical equipment.

Be sure that you are completely familiar with MSHA (Mine Safety and Health Administration), safety standards for selection, installation and use of electric motors and generators and local codes and practices. Unsafe installation or use can cause conditions that lead to serious or fatal injury. Only qualified personnel should attempt the installation, operation and maintenance of this equipment.

Do not touch electrical connections before you first ensure that power has been disconnected. Electrical shock can cause serious or fatal injury. Only qualified personnel should attempt the installation, operation and maintenance of this equipment.

Disconnect all electrical power from the motor windings and accessory devices before disassembling of the motor. Electrical shock can cause serious or fatal injury.

Be sure the system is properly grounded before applying power. Do not apply AC power before you ensure that all grounding instructions have been followed. Electrical shock can cause serious or fatal injury.

Avoid extended exposure to machinery with high noise levels. Be sure to wear ear protective devices to reduce harmful effects to your hearing.

Surface temperatures of motor enclosures may reach temperatures which can cause discomfort or injury to personnel accidentally coming into contact with hot surfaces. When installing, protection should be provided by the user to protect against accidental contact with hot surfaces. Failure to observe this precaution could result in bodily injury.

Guards must be installed for rotating parts to prevent accidental contact by personnel. Accidental contact with body parts or clothing can cause serious or fatal injury.

This equipment may be connected to other machinery that has rotating parts or parts that are driven by this equipment. Improper use can cause serious or fatal injury. Only qualified personnel should attempt to install operate or maintain this equipment.

Do not by-pass or disable protective devices or safety guards. Safety features are designed to prevent damage to personnel or equipment. These devices can only provide protection if they remain operative.

Be sure the load is properly coupled to the motor shaft before applying power. The shaft key must be fully captive by the load device. Improper coupling can cause harm to personnel or equipment if the load decouples from the shaft during operation.

Use proper care and procedures that are safe during handling, lifting, installing, operating and maintaining operations. Improper methods may cause muscle strain or other harm.

Pacemaker danger − Magnetic and electromagnetic fields in the vicinity of current carrying carrying conductors and permanent magnet motors can result result in a serious health hazard to persons with cardiac pacemakers, metal implants, and hearing aids. To avoid risk, stay way from the area surrounding a permanent magnet motor.

Before performing any motor maintenance procedure, be sure that the equipment connected to the motor shaft cannot cause shaft rotation. If the load can cause shaft rotation, disconnect the load from the motor shaft before maintenance is performed. Unexpected mechanical rotation of the motor parts can cause injury or motor damage.

Motors with S2 30 Minute Rating Without Coolant Flow are thermally protected. It is intended that this duty and operation will permit repositioning of equipment in circumstances where interruption of coolant flow may be necessary. To ensure motors do not exceed the permissible maximum surface temperature for Group I equipment according to IEC 60079−0 they must be operated according to the duty cycle. In addition, it is critical the installation, use and maintenance allows free flow of air around the motors.

Build−up of material such as coal dust that could also inhibit circulation must be removed before operation with this duty cycle. In addition, it is necessary to connect the motor thermal protection devices which act as a secondary measure to provide additional assurance that the permissible maximum surface temperature is not exceeded.

Thermostat contacts automatically reset when the motor has slightly cooled down. To prevent injury or damage, the control circuit should be designed so that automatic starting of the motor is not possible when the thermostat resets.

MN405 1-1

Safety Notice Continued

Caution:

Caution:

Caution:

Caution:

Caution:

Caution:

To prevent premature equipment failure or damage, only qualified maintenance personnel should perform maintenance.

Do not over−lubricate motor as this may cause premature bearing failure.

Do not lift the motor and its driven load by the motor lifting hardware. The motor lifting hardware is adequate for lifting only the motor. Disconnect the load (gears, pumps, compressors, or other driven equipment) from the motor shaft before lifting the motor.

If eye bolts are used for lifting a motor, be sure they are securely tightened. The lifting direction should not exceed a 20 ° angle from the shank of the eye bolt or lifting lug. Excessive lifting angles can cause damage.

To prevent equipment damage, be sure that the electrical service is not capable of delivering more than the maximum motor rated amps listed on the rating plate.

If a Motor Insulation test (High Potential Insulation test) must be performed, disconnect the motor from any Speed Control or drive to avoid damage to connected equipment.

Caution:

If you have any questions or are uncertain about any statement or procedure, or if you require additional information please contact your OEM.

Receiving Each Baldor Electric Motor is thoroughly tested at the factory and carefully packaged for shipment.

When you receive your motor, there are several things you should do immediately.

1. Observe the condition of the shipping container and report any damage immediately to the commercial carrier that delivered your motor.

2. Verify that the part number of the motor you received is the same as the part number listed on your purchase order.

Do not lift the motor and its driven load by the motor lifting hardware. The motor lifting hardware is adequate for lifting only the motor. Disconnect the load (gears, pumps, compressors, or other driven equipment) from the motor shaft before lifting the motor.

Handling

The motor should be lifted using the lifting lugs or eye bolts provided.

1. Use the lugs or eye bolts provided to lift the motor. Never attempt to lift the motor and additional equipment connected to the motor by this method. The lugs or eye bolts provided are designed to lift only the motor.

Never lift the motor by the motor shaft or hood.

2. If the motor must be mounted to a plate with the driven equipment such as pump, compressor etc., it may not be possible to lift the motor alone. For this case, the assembly should be lifted by a sling around the mounting base. The entire assembly can be lifted as an assembly for installation. If the load is unbalanced (as with couplings or additional attachments) additional slings or other means must be used to prevent tipping. In any event, the load must be secure before lifting.

Storage

Storage requirements for motors and generators that will not be placed in service for at least six months from date of shipment.

Improper motor storage will result in seriously reduced reliability and failure. An electric motor that does not experience regular usage while being exposed to normally humid atmospheric conditions is likely to develop rust in the bearings or rust particles from surrounding surfaces may contaminate the bearings.

The electrical insulation may absorb an excessive amount of moisture leading to the motor winding failure.

A wooden crate “shell” should be constructed to secure the motor during storage. This is similar to an export box but the sides & top must be secured to the wooden base with lag bolts (not nailed as export boxes are) to allow opening and closing many times without damage to the “shell”.

Minimum resistance of motor winding insulation is 5 Meg ohms or the calculated minimum, which ever is greater. Minimum resistance is calculated as follows: Rm = kV + 1 where: (Rm is minimum resistance to ground in Meg−Ohms and kV is rated nameplate voltage defined as Kilo−Volts.)

Example: For a 480VAC rated motor Rm =1.48 meg−ohms (use 5 MΩ).

For a 4160VAC rated motor Rm = 5.16 meg−ohms.

Preparation for Storage

1. Some motors have a shipping brace attached to the shaft to prevent damage during transportation. The shipping brace, if provided, must be removed and stored for future use. The brace must be reinstalled to hold the shaft firmly in place against the bearing before the motor is moved.

2. Store in a clean, dry, protected warehouse where control is maintained as follows: a. Shock or vibration must not exceed 2 mils maximum at 60 hertz, to prevent the bearings from brinelling.

If shock or vibration exceeds this limit vibration isolation pads must be used.

b. Storage temperatures of 10 °C (50 °F) to 49 °C (120 °F) must be maintained.

c. Relative humidity must not exceed 60%.

d. Motor space heaters (when present) are to be connected and energized whenever there is a possibility that the storage ambient conditions will reach the dew point. Space heaters are optional.

Note: Remove motor from containers when heaters are energized, reprotect if necessary.

1-2 MN405

3. Measure and record the resistance of the winding insulation (dielectric withstand) every 30 days of storage.

a. If motor insulation resistance decreases below the minimum resistance, contact your OEM.

b. Place new desiccant inside the vapor bag and re−seal by taping it closed.

c. If a zipper−closing type bag is used instead of the heat−sealed type bag, zip the bag closed instead of taping it. Be sure to place new desiccant inside bag after each monthly inspection.

d. Place the shell over the motor and secure with lag bolts.

4. Where motors are mounted to machinery, the mounting must be such that the drains and breathers are fully operable and are at the lowest point of the motor. Vertical motors must be stored in the vertical position.

Storage environment must be maintained as stated in step 2.

5. Motors with anti−friction bearings are to be greased at the time of going into extended storage with periodic service as follows: a. Motors marked “Do Not Lubricate” on the nameplate do not need to be greased before or during storage.

b. Ball and roller bearing (anti−friction) motor shafts are to be rotated manually every 3 months and greased every 6 months in accordance with the Maintenance section of this manual.

c. Sleeve bearing (oil lube) motors are drained of oil prior to shipment.

The oil reservoirs must be refilled to the indicated level with the specified lubricant, (see Maintenance).

The shaft should be rotated monthly by hand at least 10 to 15 revolutions to distribute oil to bearing surfaces.

6. Coat all external machined surfaces with a rust preventing material. An acceptable product for this purpose is Exxon Rust Ban # 392.

7. Carbon brushes should be lifted and held in place in the holders, above the commutator, by the brush holder fingers. The commutator should be wrapped with a suitable material such as cardboard paper as a mechanical protection against damage.

Non−Regreaseable Motors

Non−regreaseable motors with “Do Not Lubricate” on the nameplate should have the motor shaft rotated 15 times to redistribute the grease within the bearing every 3 months or more often.

All Other Motor Types

Before storage, the following procedure must be performed.

1. Remove the grease drain plug, if supplied, (opposite the grease fitting) on the bottom of each bracket prior to lubricating the motor.

2. The motor with regreaseable bearing must be greased as instructed in Section 3 of this manual.

3. Replace the grease drain plug after greasing.

4. The motor shaft must be rotated a minimum of 15 times after greasing.

5. Motor Shafts are to be rotated at least 15 revolutions manually every 3 months and additional grease added every nine months (see Section 3) to each bearing.

6. Bearings are to be greased at the time of removal from storage.

Removal From Storage

1. Remove all packing material.

2. Measure and record the electrical resistance of the winding insulation resistance meter at the time of removal from storage. The insulation resistance must not be less than 50% from the initial reading recorded when the motor was placed into storage. A decrease in resistance indicates moisture in the windings and necessitates electrical or mechanical drying before the motor can be placed into service. If resistance is low, contact your

OEM.

3. Regrease the bearings as instructed in Section 3 of this manual.

4. Reinstall the original shipping brace if motor is to be moved. This will hold the shaft firmly against the bearing and prevent damage during movement.

EX Equipment Marking and Acceptance Instructions

ATEX:

If the motor is marked as shown in Figure 1-1, it is designed to comply with all European Directives in effect at the time of manufacture, including ATEX Directive 94/9/EC, Low Voltage Directive 73/23/EEC, and EMC Directive 89/336/EEC and designed considering the Machinery Directive 98/37/ EC. It is assumed that the installation of these motors by the OE Machinery manufacturer complies with this

Directive and the standard EN 60204−1: Safety of Machinery − Electrical Equipment of Machines.

Figure 1-1 Typical AC and DC Mine Motor Markings

FLAMEPROOF Exd ENCLOSURE

EExd I

IP ______

0518

I M2 Sira ____ ATEX _____

MFG. BY BALDOR ELECTRIC FORT SMITH, AR 72901 USA

MN405 1-3

1-4

Any repairs by the end user, unless expressly approved by Baldor Electric Company, release Baldor Electric

Company from responsibility to conformity. Authorized and qualified personnel only must perform repairs. These motors are designed in accordance with appropriate governmental regulatory agencies. They meet the technical requirements of the appropriate agencies at completion of manufacturing and have been issued approval numbers and nameplates. Any changes to these motors, may void these approvals and render these motors non− conforming and dangerous for use.

These motors are suitable for the ATEX Group and Category marked on the equipment nameplate. These motors are designed for normal mining applications and are in compliance with the above safety directives when operated within the parameters identified on the motor nameplate.

Specific motor type, frame designation, model number, date code, electrical specifications, and serial number are marked on a separate nameplate. Special Conditions are indicated on the motor nameplate as a suffix “X” on the certificate number. Details of this condition can be found on the motor approval certificate.

IEC, IECEx, ANZEX CERTIFICATION:

If the motors are marked as Indicated below, the motors are certified to IEC60079−0 and IEC60079−1 standard series. It is assumed that the installation of these motors by the OE Machinery manufacturer will be carried out in accordance with any national requirements for the intended market. Any Repairs by the end user, unless expressly approved by Baldor Electric Company, release Baldor Electric Company from responsibility to conformity.

Authorized and qualified personnel only must perform repairs.

These motors are designed in accordance with appropriate governmental regulatory agencies. They meet the technical requirements of the appropriate agencies at completion of manufacturing and have been issued approval numbers and nameplates. Any changes to these motors, without the consent of Baldor Electric

Company and the regulatory agencies may void these approvals and render these motors non−conforming and dangerous for use.

These motors are suitable for Group I with a maximum surface temperature of 150 °C. Typical motor marking is shown in Figure 1-2.

Figure 1-2 Typical AC and DC Mine Motor Markings

FLAMEPROOF Exd ENCLOSURE

TYPE ___________________ Ex dl 150°C

CERTIFICATE

NUMBER ___________________________

MFG. BY BALDOR ELECTRIC FORT SMITH, AR 72901 USA

Specific motor type, frame designation, model number, date code electrical specifications, and serial number are marked on a separate nameplate. The certificate number provides additional information for example certificate numbers such as IECEx are in the form IECExCCC. YY.nnnnX”, where CCC is the

Certification Body, YY the year the certificate is issued, nnnn the certificate number and “X” is present if there are special conditions. For the ANZEx scheme, a similar convention exists and the numbers are in the form of “ANZEx YY.nnnnX” The certificate number is assigned to the various Australian certification bodies. Refer to the certificate for details on marking code and conditions of certification.

Specific Conditions of Use:

If the motor certificate number is followed by the symbol “X”, this indicates that the motor has specific conditions of use which are indicated on the certificate. It is necessary to review the product certification certificate in conjunction with this instruction manual.

Operation On Frequency Converters:

If the motor is evaluated for operation with an adjustable speed drive, the type of converter (for example

PWM for Pulse Width Modulated) and safe speed ranges (for example 0−120Hz) will be specified in the certification documents or on motor nameplates. It is necessary to consult the adjustable speed drive manual for proper set up. IECEx Certificates are available online at www.iecex.com

Typical Speed vs Torque Curves are shown in Figure 1-3. For values relative to your specific motor, consult the motor nameplate marking.

MN405

Figure 1-3 Typical Speed vs Torque Curves

Load Types

120

100

80

60

40

20

VT

CT

CHP

0

0 20 40 60 80 100

Percent Speed

120 140 160 180 200

Acceptance Inspection

All motors should be inspected for damage prior to connecting the motor to an electrical supply. All covers should be in place and access cover bolts torqued to their proper levels. On motors received with the shaft blocked by the factory, remove blocking before operating the motor. If motor is to be reshipped, alone or installed to another piece of equipment, the shaft must again be blocked against axial movement to prevent brinelling of the bearings during shipment.

EMC Compliance Statement for European Union

The motors described in this instruction manual are designed to comply 2004/108/EC . These motors are commercial in design and not intended for residential use. When used with converters, please consult converter manufacturers literature regarding recommendations on cable types, cable shielding, cable shielding termination, connection recommendations and any filters which may be recommended for EMC compliance. For additional information, consult Baldor MN1383.

MN405 1-5

1-6 MN405

Section 2

Installation & Operation

WARNING:

Caution:

Electrostatic discharge from belts and pulleys must be eliminated prior to operation in areas subject to the risk of explosion. Explosion may result in severe injury or death.

Do not lift the motor and its driven load by the motor lifting hardware. The motor lifting hardware is adequate for lifting only the motor. Disconnect the load (gears, pumps, compressors, or other driven equipment) from the motor shaft before lifting the motor.

Overview

Caution:

Strict compliance with all local and national laws, regulations, and practices regarding the safe operation and maintenance of underground mining equipment is necessary to assure the personal safety of those working on, or around this equipment.

If eye bolts are used for lifting a motor, be sure they are securely tightened. The lifting direction should not exceed a 20 ° angle from the shank of the eye bolt or lifting lug. Excessive lifting angles can cause damage.

Installation

When a common base is used to mount the motor and driven equipment, do not use the lifting means provided on the motor. The assembly should be lifted by a sling around the base or by other lifting means provided on the base.

Assure lifting in the direction intended in the design of the lifting means.

Also use precautions to prevent hazardous overloads due to deceleration, acceleration or shock forces. Eyebolts, lifting lugs or lifting openings when provided on the motor, are intended only for lifting the motor and standard motor mounted accessories not exceeding, in total, 30% of the motor weight. These lifting provisions should never be used when lifting or handling the motor and other equipment (i.e., gears, pumps or other driven equipment) as single unit.

When the motor is an integral part of the mining machine, it should be mounted as prescribed by the OEM manufacturer. Where motors are separately mounted, a foundation sufficiently rigid to prevent excessive vibration should be used.

Alignment

WARNING:

Guarding

Guards must be installed for rotating parts. This is particularly important where the parts have surface irregularities or hot surface temperatures.

Power Connection

Motor and control wiring, overload protection, disconnects, accessories and grounding should conform to applicable national and local codes.

Frames and accessories of motors must be earth bonded in accordance with recommended national and local codes. Motors must be properly grounded to earth by the OE mining equipment manufacturer and by qualified electricians during the field installation of replacement motors.

Connect the motor to the power supply of identical characteristics, according to the connection diagram on the motor nameplate. Use Connection Diagrams at the end of this section.

This motor must be properly grounded to earth prior to operation. The motor earthing connection cable or facility is located adjacent to the motor power terminals in the motor conduit box or lead connection area.

The earthing connection must be securely tightened to prevent loosening.

The machine cable providing power to the motor must incorporate an earthing conductor with a minimum cross− sectional area corresponding with the table below.

Grounding

Accurate alignment of the motor with the driven equipment is extremely important. Forcibly driving the coupling or load onto the motor shaft will damage the bearings.

After careful alignment, bolt motor securely in place. Use shims to fill any unevenness in the foundation.

All motor feet should sit solidly on foundation before mounting bolts are tightened.

The OEM must specify motor starter and overcurrent protection suitable for this motor and its application.

Consult motor starter application data as well as applicable national and local codes.

Guards must be installed for rotating parts to prevent accidental contact by personnel. Accidental contact with body parts or clothing can cause serious or fatal injury.

In the USA consult MSHA requirements for information on grounding of motors. In making the ground connection, the installer should make certain that there is a solid and permanent metallic connection between the ground point, the motor or generator terminal housing, and the motor or generator frame. In non−USA locations consult the appropriate applicable national and local codes.

Motors with resilient cushion rings usually must be provided with a bonding conductor across the resilient member. Some motors are supplied with the bonding conductor on the concealed side of the cushion ring to protect the bond from damage. Motors with bonded cushion rings should usually be grounded at the time of installation in accordance with the above recommendations for making ground connections. When motors with bonded cushion rings are used in multimotor installations employing group fusing or group protection, the bonding of the cushion ring should be checked to determine that it is adequate for the rating of the branch circuit over current protective device being used.

There are applications where grounding the exterior parts of a motor or generator may result in greater hazard by increasing the possibility of a person in the area simultaneously contacting ground and some other nearby live electrical parts of other ungrounded electrical equipment. In portable equipment it is difficult to be sure that a positive ground connection is maintained as the equipment is moved, and providing a grounding conductor may lead to a false sense of security.

Select a motor starter and over current protection suitable for this motor and its application. Consult motor starter application data as well as the National Electric Code and/or other applicable local codes.

For motors installed in compliance with IEC requirements, the following minimum cross sectional area of the protective conductors should be used:

MN405 2-1

2-2

Conduit Box

AC Power

Rotation

DC Power

Cross sectional area of phase conductors, S mm2

6

10

16

25

35

50

70

Minimum cross sectional area of the corresponding protective conductor, S

p

mm2

6

10

16

25

25

25

35

95

120

150

50

70

70

Equipotential bonding connection shall made using a conductor with a cross-sectional area of at least 4 mm

2

. For mining motors intended for installation in mobile mining equipment, without an identified provision for bonding, these motors are intended to be bonded through the mechanical connection with the mining equipment, relying on the equipment being supplied by a cable incorporating an earthing or equipotential bonding conductor, which is connected inside the motor.

For ease of making connections, an oversize conduit box may be provided. Some conduit boxes can be rotated

360 ° in 90 ° increments. Auxiliary conduit boxes are provided on some motors for accessories such as space heaters, RTD’s etc.

Motors with flying lead construction must be properly terminated and insulated.

Connect the motor leads as shown on the connection diagram located on the name plate or inside the cover on the conduit box. Be sure the following guidelines are met:

1. AC power is within +10% of rated voltage with rated frequency. (See motor name plate for ratings).

OR

2. AC power is within +5% of rated frequency with rated voltage.

OR

3. A combined variation in voltage and frequency of +10% (sum of absolute values) of rated values, provided the frequency variation does not exceed +5% of rated frequency.

Performance within these voltage and frequency variations are shown in Figure 2-1.

AC Motor Only

All three phase motors are reversible. To reverse the direction of rotation, disconnect and lock out power and interchange any two of the three line leads for three phase motors. For single phase motors, check the connection diagram to determine if the motor is reversible and follow the connection instructions for lead numbers to be interchanged. Not all single phase motors are reversible.

Adjustable Frequency Power Inverters used to supply adjustable frequency power to induction motors produce wave forms with lower order harmonics with voltage spikes superimposed. Turn−to−turn, phase−to−phase, and ground insulation of stator windings are subject to the resulting dielectric stresses.

Suitable precautions should be taken in the design of these drive systems to minimize the magnitude of these voltage spikes. Consult the OEM instructions for maximum acceptable motor lead lengths, and proper grounding.

Check the motor nameplate and the SCR Control nameplate to be sure the voltage and type of power rating is the same for both. The power code of the motor and power source should be the same. The letter code for the control may be equal or less than the motor. For example a motor with a “C” power code may be used on a supply with a “C” or “A” or less code. Table 2−1 defines these codes.

Table 2-1 Power Codes

Code

A

C

Description

DC Generator, battery or twelve pulse/cycle 6 phase, full control

Six pulse/cycle, 3 phase, full control, 230VAC or 460VAC, 60Hz, input to rectifier.

When the armature power supply cannot be designated by a single letter code (A−K) the power source can be determined by the code stamped on the nameplate: M/N F−V−H−L

Where:

M Total pulses per cycle

N Total controlled pulses per cycle

F Free Wheeling (if used), F=used, blank=not used

V Nominal Line−to−Line voltage at input to rectifier

H Line frequency (in Hz)

L Value of inductance (in milli henries) to be added externally to the motor armature circuit

MN405

WARNING:

Operation

WARNING:

Example 1: “6/3 F-380-60-12”

Requires a power supply with 6 total pulses per cycle, 3 controlled pulses per cycle (S-3), with free wheeling, 380 volts, 60 Hz AC input to bridge, and a 12 millihenry choke to be added externally to the motor armature circuit.

Performance within these voltage and frequency variations are shown in Figure 2-1.

Motors with S2 30 Minute Rating Without Coolant Flow are thermally protected. It is intended that this duty and operation will permit repositioning of equipment in circumstances where interruption of coolant flow may be necessary. To ensure motors do not exceed the permissible maximum surface temperature for Group I equipment according to IEC 60079−0 they must be operated according to the duty cycle. In addition, it is critical the installation, use and maintenance allows free flow of air around the motors. Build− up of material such as coal dust that could also inhibit circulation must be removed before operation with this duty cycle. In addition, it is necessary to connect the motor thermal protection devices which act as a secondary measure to provide additional assurance that the permissible maximum surface temperature is not exceeded.

Note: To provide proper cooling, always provide proper coolant flow. Before disconnecting coolant flow during repositioning of equipment do the following: 1) Ensure motor thermal devices are properly installed.

2) Remove any debris on equipment and motor for maximum conduction of heat for brief periods when coolant flow is interrupted.

AC and DC Mine Motors are designed to operate in a normal mining environment. Loading and operation of motors should be in accordance with the nameplate data. The motor has been designed based on rating information, application data, and duty cycle analysis provided by the OEM. Proper motor cooling is required for normal operation of the motor.

Operation in excess of nameplate parameters is not recommended and may result in damage to the equipment and potential injury to operators and persons near the equipment. Safety related switching used by the OEM must actuate the relevant control devices without intermediate software command.

Where intermediate circuitry is involved the circuit shall fall within the scope of a safety, controlling and regulating device as defined in article 1(2) of European Directive 94/9/EC, and shall be covered by an appropriate EC Type

Examination Certificate.

These motors are designed to operate at or below the maximum surface temperature stated in the ATEX directive in a normal mining application. Operation of these motors in excess of the nameplate parameters may cause the maximum allowable surface temperature to be exceeded, resulting in a risk of explosion.

Temperature detection devices may be provided in these motors. The OEM determines the control setup to ensure operation within the thermal limit characteristics of the motor.

The following conditions are examples of improper motor operation:

1. Load imposed on the motor exceeds its nameplate value or motor power rating.

2. Ambient temperatures that exceed the nameplate temperature value.

3. Voltages +10% above or below the voltage(s) specified on the motor nameplate.

4. Voltage unbalanced conditions.

5. Insufficient or loss of coolant flow.

6. Adjustable frequency operation for motors designed for sine wave power only.

7. Altitude above 3000 ft (1000m).

8. Severe duty cycles and/or repeated starts.

9. Motor stall.

10. Motor reversing

11. Polyphase motors being operated in single phase condition

12. Operating motors on variable frequency drives with operating parameters other than those specified on the motor certification drawings

13. Improper alignment of motor mounting.

Note: Main power leads for CE Marked Motors may be marked U,V,W – for standard configurations, please consult connection diagrams.

MN405 2-3

Connection Diagrams

2-4 MN405

Connection Diagrams Continued

MN405 2-5

2-6

Figure 2-1 Typical Motor Performance VS Voltage Variations

+20

+15

Full -Load

Current

+10

+5

Power

Factor

Maximum

Torque

Full -Load

Current

0

−5

Efficiency

−10

Efficiency

−15

−20

−15

Maximum

Torque

−10 +10

Power

Factor

+15 −5 0

Voltage Variations (%)

+5

First Time Start Up

Be sure that all power to motor and accessories is off. Be sure the motor shaft is disconnected from the load and will not cause mechanical rotation of the motor shaft.

1. Make sure that the mechanical installation is secure. All bolts and nuts are tightened etc.

2. If motor has been in storage or idle for some time, check winding insulation integrity.

3. Inspect all electrical connections for proper termination, clearance, mechanical strength and electrical continuity.

4. Be sure all shipping materials and braces (if used) are removed from motor shaft.

5. Manually rotate the motor shaft to ensure that it rotates freely.

6. Replace all panels and covers that were removed during installation.

7. Momentarily apply power and check the direction of rotation of the motor shaft.

8. If motor rotation is wrong, be sure power is off and change the motor lead connections.

9. Verify rotation direction before you continue.

10. Start the motor and ensure operation is smooth without excessive vibration or noise.

11. If so, run the motor for 1 hour with no load connected.

12. After 1 hour of operation, disconnect power and connect the load to the motor shaft.

13. Verify all coupling guards and protective devices are installed. Ensure motor is properly ventilated.

14. If motor is totally enclosed fan−cooled or non−ventilated it is recommended that condensation drain plugs, if present, be removed. These are located in the lower portion of the end−shields. Totally enclosed fan−cooled

“XT” motors are normally equipped with automatic drains which may be left in place as received.

Initial Lubrication

Baldor motors are shipped from the factory with the bearings properly packed with grease and ready to operate. Where the unit has been subjected to extended storage (6 months or more) the bearings should be relubricated (regreaseable type) prior to starting. When motors are equipped for oil mist lubrication refer to the instruction manual for installation, operation, and maintenance of oil mist lubrication systems.

MN405

Test for General Condition

Coupled Start Up

If the motor has been in storage for an extensive period or has been subjected to adverse moisture conditions, it is best to check the insulation resistance of the stator winding with a meg ohm meter. If the resistance is less than

5 meg ohms, the windings should be dried. Contact your OEM.

This procedure assumes a coupled start up. Also, that the first time start up procedure was successful.

1. Check the coupling and ensure that all guards and protective devices are installed.

2. Check that the coupling is properly aligned and not binding.

3. The first coupled start up should be with no load. Apply power and verify that the load is not transmitting excessive vibration back to the motor though the coupling or the foundation. Vibration should be at an acceptable level.

4. Run for approximately 1 hour with the driven equipment in an unloaded condition. The equipment can now be loaded and operated within specified limits. Do not exceed the name plate ratings for amperes for steady continuous loads.

Jogging and Repeated Starts

Repeated starts and/or jogs of induction motors generally reduce the life of the motor winding insulation. A much greater amount of heat is produced by each acceleration or jog than by the same motor under full load. If it is necessary to repeatedly start or jog the motor, it is advisable to check the application with your local Baldor distributor or Baldor Service Center.

Heating Duty rating and maximum ambient temperature are stated on the motor name plate.

Do not exceed these values. If there is any question regarding safe operation, contact your local Baldor

District Office or Baldor Service Center.

Hazardous Locations

Selection

Hazardous locations are those where there is a risk of ignition or explosion due to the presence of combustible gases, vapors, dust, fibers or flyings.

Facilities requiring special equipment for hazardous locations are typically classified in accordance with local requirements. This classification process lets the installer know what equipment is suitable for installation in that environment, and identifies what the maximum safe temperature or temperature class is required. It is the customer or users responsibility to determine the area classification and select proper equipment.

Protection Concepts

Zone 1 [Equipment Group I (mining) or Equipment Protection Level (EPL) Gb, Mb]

BaldorReliance offers a range of motors suitable for installation in a mining environment. These motors are known as explosion proof or flameproof. Motors that are explosion proof or flameproof use specially machined flameproof joints between the end bell or bracket and the frame, as well as along the rotating shaft and at connection box covers and entries. The fit of these flameproof joints are designed to contain the combustion or quench the flame of an explosive gas atmosphere prior to it exiting the motor. These flameproof joints have lengths and widths selected and tested based on the gas group present in the atmosphere.

These motors are not gas tight. To the contrary, this protection concept assumes that due to the normal heating and cooling cycle of motor operation that any gas present will be drawn into the motor. Since flameproof or explosion proof motors are designed to contain the combustion and extinguish any flame transmission, for this protection concept, only external surface temperatures are of concern. Thermal limiting devices such as thermostats, thermistors or RTDs may be provided on these motors to limit the external surface temperature during overload conditions.

If thermostats are provided as a condition of certification, it is the installer’s responsibility to make sure that these devices are properly connected to a suitable switching device. Flameproof motors are internationally referred to as Ex d. Representative motors are laboratory tested to verify that a flame is not transmitted outside the motor enclosure and to determine the maximum internal pressure encountered.

When explosion proof or flameproof motors are provided with intrinsically safe sensors, the integrity of that system relies upon the proper application and selection of barriers and cables as described in the sensor manufacturers control drawing. The control drawing will be shipped with the motor, and it is important that those instructions be provided to the equipment installer.

Sine Wave Power Operation for Hazardous Locations.

These motors are designed to operate at or below the maximum surface temperature (or T−Code) stated on the nameplate. Failure to operate the motor properly can cause this maximum surface temperature to be exceeded. If applied in a mining environment, this excessive temperature may cause ignition of hazardous materials. Operating the motor at any of the following conditions can cause the marked surface temperature to be exceeded.

1. Motor load exceeding service factor nameplate value

2. Ambient temperatures above nameplate value

3. Voltages above or below nameplate value

4. Unbalanced voltages

5. Loss of proper ventilation

6. Altitude above 3300 feet / 1000 meters

7. Severe duty cycles of repeated starts

8. Motor stall

MN405 2-7

9. Motor reversing

10. Single phase operation of polyphase equipment

11. Variable frequency operation

Variable Frequency Power Operation for Hazardous Locations (motors with maximum surface temperature listed on the nameplate).

Only motors with nameplates marked for use on inverter (variable frequency) power, and labeled for specific hazardous areas may be used in those hazardous areas on inverter power. The motor is designed to operate at or below the maximum surface temperature (150 °C) stated on the nameplate.

Failure to operate the motor properly can cause this maximum surface temperature to be exceeded.

If applied in a mining environment, this excessive temperature may cause ignition of hazardous materials.

Operating the motor at any of the following conditions can cause the marked surface temperature to be exceeded.

1. Motor load exceeding service factor nameplate value

2. Ambient temperature above nameplate value

3. Voltage (at each operating frequency) above or below rated nameplate value

4. Unbalanced voltages

5. Loss of proper ventilation

6. Operation outside of the nameplate speed / frequency range

7. Altitudes above 3300 feet / 1000 meters

8. Single phase operation of polyphase equipment

9. Unstable current wave forms

10. Lower than name plate minimum carrier frequency

Thermal Limiting

Thermal limiting devices are temperature sensing control components installed inside the motor to limit the internal temperature of the motor frame by interrupting the circuit of the holding coil of the magnetic switch or contactor. They are required for most Division 1 and Zone 1 applications. For Division 2 or Zone 2 applications, motors should be selected that preclude running temperatures from exceeding the ignition temperatures for the designated hazardous material. In Division 2 or Zone 2 classified locations, thermal limiting devices should only be used for winding protection and not considered for limiting all internal motor temperatures to specific ignition temperatures.

Equipotential Bonding and Shaft Current Reduction

Larger motors (ie WP construction) may require proper bonding between motor enclosures and covers to avoid the risk of stray currents during start up. Fastening methods and bonding straps must not be modified. Bearing currents can exist in some motors for both line−fed and inverter−fed applications. Larger line−fed motors may require at least one insulated bearing to prevent a flow of current through the bearings. Do not defeat such insulation whether the motor is line−fed or inverter−fed applications. Inverter−fed motors may require additional bearing insulation or even a shaft brush. Do not defeat such features. When the motor and the coupled load are not on a common conductive base plate, it may also be necessary to electrically bond together the stationary parts of the motor and the coupled equipment.

Repair of Motors used in Hazardous Locations

Repair of hazardous certified motors requires additional information, skill, and care. It is the customer’s responsibility to select service shops with proper qualifications to repair hazardous location motors.

Contact the manufacture for additional repair details. Use only original manufacturer’s parts.

Repair of Explosion Proof or Flame Proof Motors

In the international markets using IEC based requirements, repair should be undertaken only after consulting

IEC60079−19 Explosive Atmospheres−Part 19 Equipment repair, overhaul and reclamation. If use of a certified repair facility is desired, consult the IECEx Repair Scheme at http://www.iecex.com/service_facilities.htm

Explosion proof and flameproof motors achieve their safety based on the mechanical construction − flameproof joints and bearing clearance, and the electrical design including any thermal limiting devices.

If it is necessary to repair a flameproof or explosion proof motor, it is critical that the mechanical flameproof joints be maintained. Consult Baldor Electric Company for flameproof joint construction details. Use only

Baldor/Reliance supplied parts. Baldor/Reliance does not recommend reclamation of parts.

Since this protection method also relies on temperature being maintained, make sure that any rewinding uses the original electrical designs, including any thermal protection that may be present.

2-8 MN405

Section 3

Maintenance & Troubleshooting

WARNING: UL and EX Listed motors must only be serviced by UL or EX Approved Authorized Baldor Service Centers if these motors are to be returned to a hazardous and/or explosive atmosphere.

General Inspection

WARNING:

Inspect the motor at regular intervals, approximately every 500 hours of operation or every 3 months, whichever occurs first. Keep the motor clean and the ventilation openings clear. The following steps should be performed at each inspection:

Do not touch electrical connections before you first ensure that power has been disconnected. Electrical shock can cause serious or fatal injury. Only qualified personnel should attempt the nstallation, operation and maintenance of this equipment.

1. Check that the motor is clean. Check that the interior and exterior of the motor is free of dirt, oil, grease, water, etc. Oily vapor, paper pulp, textile lint, etc. can accumulate and block motor ventilation. If the motor is not properly ventilated, overheating and early failure can occur.

2. Perform a dielectric withstand test periodically to ensure that the integrity of the winding insulation has been maintained. Record the readings. Immediately investigate any significant decrease in insulation resistance.

3. Check all electrical connectors to be sure that they are tight.

Maintenance DC Motors Only

Brush pressure is correctly established at the factory and maintained at the correct value throughout the life of the brush by means of a constant pressure design. Brushes and brush holders should be clean to allow brushes to move freely in the holders. Replace brushes with new brushes of the same grade before wear permits the rivet or tamped pigtail to score the commutator. It is recommended to replace all brushes at one time.

Relubrication & Bearings

Bearing grease will lose its lubricating ability over time, not suddenly. The lubricating ability of a grease (over time) depends primarily on the type of grease, the size of the bearing, the speed at which the bearing operates and the severity of the operating conditions. Good results can be obtained if the following recommendations are used in your maintenance program.

Type of Grease

A high grade ball or roller bearing grease should be used. Use only OEM recommended grease.

Do not mix greases unless compatibility has been checked and verified.

Relubrication Intervals

Recommended relubrication intervals are shown in Table 3-1. It is important to realize that the recommended intervals of Table 3-1 are based on average use. Refer to additional information in Tables 3-2 and 3-3.

Table 3-1 Relubrication Intervals *

Rated Power Lubrication Frequency

1 − 10kW, <1800RPM

11 − 100kW, <1800RPM

>100kW, <1800RPM

All >1800 RPM

6 months

3 months

1 month

1 month

* Relubrication intervals are for ball bearings.

For roller bearings, divide the relubrication interval by 2.

** For motors operating at speeds greater than 3600 RPM, contact OEM for relubrication recommendations.

Table 3-2 Service Conditions

Severity of Service "Hours per day of Operation"

Standard

Severe

Extreme

8

16 Plus

16 Plus

"Ambient Temperature

Maximum"

40 °C

50 °C

">50 °C or

Class H Insulation"

"Atmospheric

Contamination"

Clean, Little Corrosion

Moderate dirt, Corrosion

"Severe dirt, Abrasive dust,

Corrosion, Heavy

Shock or Vibration"

Low Temperature <−29 °C

Table 3-3 Relubrication Interval Multiplier

Severity of Service Multiplier

Standard

Severe

Extreme

Low Temperature

1.0

0.5

0.1

1.0

MN405 3-1

Caution:

Some motor designs use different bearings on each motor end. This is normally indicated on the motor nameplate. In this case, the larger bearing is installed on the motor Drive endplate. For best relubrication results, only use the appropriate amount of grease for each bearing size (not the same for both).

To avoid damage to motor bearings, grease must be kept free of dirt. For an extremely dirty environment, contact your OEM for additional information.

Relubrication Procedure

Caution:

Be sure that the grease you are adding to the motor is compatible with the grease already in the motor. Consult OEM if a grease other than the recommended type is to be used.

Do not over−lubricate motor as this may cause premature bearing failure.

Caution:

With Grease Outlet Plug

1. With the motor stopped, clean all grease fittings with a clean cloth.

2. Remove grease outlet plug.

Over−lubricating can cause excessive bearing temperatures, premature lubrication breakdown and bearing failure.

3. Add the recommended amount of grease.

4. Operate the motor for 15 minutes with grease plug removed. This allows excess grease to purge.

5. Re-install grease outlet plug.

Without Grease Provisions

1. Disassemble the motor.

2. Add recommended amount of grease to bearing and bearing cavity. (Bearing should be about 1/3 full of grease and outboard bearing cavity should be about 1/2 full of grease.)

3. Assemble the motor.

Sample Relubrication Determination

Assume - NEMA 286T (IEC 180), 1750 RPM motor driving an exhaust fan in an ambient temperature of 43 °C and the atmosphere is moderately corrosive.

1. Table 3-2 list 9500 hours for standard conditions.

2. Table 3-3 classifies severity of service as “Severe”.

3. Approximately 1.2 in

3

or 3.9 teaspoon of grease is to be added.

Note: Smaller bearings in size category may require reduced amounts of grease.

3-2 MN405

Symptom

Motor will not start

Excessive humming

Motor Over Heating

Bearing Over Heating

Vibration

Noise

Growling or whining

Possible Causes

"Usually caused by line trouble, such as, single phasing at the starter."

High Voltage.

Eccentric air gap.

"Overload. Compare actual amps

(measured) with nameplate rating."

Single Phasing.

Improper ventilation.

Unbalanced voltage.

Rotor rubbing on stator.

Misalignment.

Excessive belt tension.

Excessive end thrust.

Excessive grease in bearing.

Insufficient grease in bearing.

Dirt in bearing.

Table 3-4 Troubleshooting Chart

Over voltage or under voltage.

Open stator winding.

Grounded winding.

Improper connections.

Possible Solutions

"Check source of power. Check overloads, fuses, controls, etc."

Check input line connections.

Have motor serviced at local Baldor service center.

"Locate and remove source of excessive friction in motor or load.

Reduce load or replace with motor of greater capacity."

"Check current at all phases (should be approximately equal) to isolate and correct the problem."

"Check external cooling fan to be sure air is moving properly across cooling fins. Excessive dirt build-up on motor. Clean motor."

"Check voltage at all phases (should be approximately equal) to isolate and correct the problem."

Check air gap clearance and bearings.

Tighten “Thru Bolts”.

Check input voltage at each phase to motor.

"Check stator resistance at all three phases for balance."

Perform dielectric test and repair as required.

"Inspect all electrical connections for proper termination, clearance, mechanical strength and electrical continuity. Refer to motor lead connection diagram."

Check and align motor and driven equipment.

Reduce belt tension to proper point for load.

Reduce the end thrust from driven machine.

Remove grease until cavity is approximately 3/4 filled.

Add grease until cavity is approximately 3/4 filled.

"Clean bearing cavity and bearing.

Repack with correct grease until cavity is approximately 3/4 filled."

Check and align motor and driven equipment.

Isolate and eliminate cause of rubbing.

Misalignment.

"Rubbing between rotating parts and stationary parts."

Rotor out of balance.

Resonance.

"Foreign material in air gap or ventilation openings."

Bad bearing.

"Have rotor balance checked are repaired at your Baldor Service Center."

"Tune system or contact your Baldor Service Center for assistance."

"Remove rotor and foreign material. Reinstall rotor.

Check insulation integrity. Clean ventilation openings."

"Replace bearing. Clean all grease from cavity and new bearing.

Repack with correct grease until cavity is approximately 3/4 filled."

MN405 3-3

3-4 MN405

MN405-0415

Baldor Electric Company

P.O. Box 2400, Fort Smith, AR 72902-2400 U.S.A., Ph: (1) 479.646.4711, Fax (1) 479.648.5792, International Fax (1) 479.648.5895 www.baldor.com

© Baldor Electric Company

MN405

All Rights Reserved. Printed in USA.

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