Integral Horsepower
AC Induction Motors
ODP, WPI Enclosures
TENV, TEAO, TEFC Enclosure
Explosion Proof
7/14 Installation & Operating Manual MN408
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Important:
Be sure to check www.baldor.com to download the latest version of this manual in Adobe Acrobat PDF format.
Table of Contents
Section 1
General Information ................................................................. 1-1
Overview ....................................................................... 1-1
Limited Warranty ................................................................. 1-1
Safety Notice ................................................................... 1-1
Receiving ...................................................................... 1-2
Handling ........................................................................ 1-2
Storage ........................................................................ 1-3
Removal From Storage ............................................................ 1-4
Equipment Marking for IEC Certied Product ........................................... 1-5
EMC Compliance Statement for European Union ........................................ 1-5
Section 2
Installation & Operation .............................................................. 2-1
Overview ....................................................................... 2-1
Location ........................................................................ 2-1
Mounting Location ................................................................ 2-1
Frame Mounting Holes ......................................................... 2-2
Alignment ................................................................... 2-2
Doweling & Bolting ............................................................ 2-2
Guarding .................................................................... 2-3
Power Connection ................................................................ 2-3
Grounding .................................................................. 2-3
Conduit Box ................................................................. 2-3
AC Power ................................................................... 2-4
Rotation ................................................................... 2-4
Connection Diagrams ............................................................. 2-5
Initial Lubrication ................................................................. 2-7
First Time Start Up ............................................................... 2-7
Coupled Start Up ................................................................. 2-8
Jogging and Repeated Starts ....................................................... 2-8
Hazardous Locations ............................................................. 2-8
Selection .................................................................... 2-8
Protection Concepts ........................................................... 2-8
Repair of Motors used in Hazardous Locations ......................................... 2-10
Section 3
Maintenance & Troubleshooting ....................................................... 3-1
General Inspection ................................................................ 3-1
Relubrication & Bearings .......................................................... 3-1
Relubrication Intervals ............................................................. 3-2
Relubrication Procedure ........................................................... 3-4
Shaker Duty Motors only ........................................................... 3-4
Troubleshooting Chart ............................................................ 3-5
Suggested bearing and winding RTD setting guidelines for Non−Hazardous Locations ONLY ..... 3-6
iMN408
ii MN408
Section 1
General Information
Overview 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.
Important: 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 Baldor distributor for
more information or clarification.
Before you install, operate or perform maintenance, become familiar with the following:
• NEMA Publication MG-2, Safety Standard for Construction and guide for Selection, Installation and Use of
Electric Motors and Generators.
• IEC 34−1 Electrical and IEC72−1 Mechanical specications
• ANSI C51.5, the National Electrical Code (NEC) and local codes and practices.
Limited Warranty
www.baldor.com/support/warranty_standard.asp
Safety Notice: This equipment contains high voltage! Electrical shock can cause serious or fatal injury. Only qualified
WARNING: Do not touch electrical connections before you first ensure that power has been disconnected.
WARNING: Disconnect all electrical power from the motor windings and accessory devices before disassembly of
WARNING: Be sure the system is properly grounded before applying power. Do not apply AC power before you
WARNING: Avoid extended exposure to machinery with high noise levels. Be sure to wear ear protective devices to
WARNING: Surface temperatures of motor enclosures may reach temperatures which can cause discomfort or
WARNING: This equipment may be connected to other machinery that has rotating parts or parts that are driven by
WARNING: Do not by-pass or disable protective devices or safety guards. Safety features are designed to prevent
WARNING: Avoid the use of automatic reset devices if the automatic restarting of equipment can be hazardous to
WARNING: Be sure the load is properly coupled to the motor shaft before applying power. The shaft key must be
WARNING: UL Listed motors must only be serviced by UL Approved Authorized Baldor Service Centers if these
WARNING: Thermostat contacts automatically reset when the motor has slightly cooled down. To prevent injury or
WARNING: Use proper care and procedures that are safe during handling, lifting, installing, operating and
WARNING: Pacemaker danger − Magnetic and electromagnetic fields in the vicinity of current carrying carrying
WARNING: Before performing any motor maintenance procedure, be sure that the equipment connected to the
Continued on next page.
personnel should attempt installation, operation and maintenance of electrical equipment. Be sure
that you are completely familiar with NEMA publication MG-2, safety standards for construction and
guide for selection, installation and use of electric motors and generators, the National Electrical Code
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.
Electrical shock can cause serious or fatal injury. Only qualified personnel should attempt the
installation, operation and maintenance of this equipment.
the motor. Electrical shock can cause serious or fatal injury.
ensure that all grounding instructions have been followed. Electrical shock can cause serious or fatal
injury. National Electrical Code and Local codes must be carefully followed.
reduce harmful effects to your hearing.
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.
this equipment. Improper use can cause serious or fatal injury. Only qualified personnel should attempt
to install operate or maintain this equipment.
damage to personnel or equipment. These devices can only provide protection if they remain operative.
personnel or equipment.
fully captive by the load device. Improper coupling can cause harm to personnel or equipment if the
load decouples from the shaft during operation.
motors are to be returned to a hazardous and/or explosive atmosphere.
damage, the control circuit should be designed so that automatic starting of the motor is not possible
when the thermostat resets.
maintaining operations. Improper methods may cause muscle strain or other harm.
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.
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.
General Information 1-1MN408
Safety Notice Continued
WARNING: Do not use non UL/CSA listed explosion proof motors in the presence of flammable or combustible
WARNING: Motors that are to be used in flammable and/or explosive atmospheres must display the UL label on the
WARNING: Guards must be installed for rotating parts such as couplings, pulleys, external fans, and unused shaft
Caution: To prevent premature equipment failure or damage, only qualified maintenance personnel should
Caution: Do not over tension belts. Excess tension may damage the motor or driven equipment.
Caution: Do not over−lubricate motor as this may cause premature bearing failure.
Caution: Do not lift the motor and its driven load by the motor lifting hardware. The motor lifting hardware is
Caution: If eye bolts are used for lifting a motor, be sure they are securely tightened. The lifting direction should
Caution: To prevent equipment damage, be sure that the electrical service is not capable of delivering more than
Caution: If a HI POT test (High Potential Insulation test) must be performed, follow the precautions and procedure
Caution: The space heaters are designed to operate at or below the maximum surface temperature stated on the
Caution: Shaker Duty motors must be properly lubricated prior to Start Up to prevent damage. See Section 3.
vapors or dust. These motors are not designed for atmospheric conditions that require explosion proof
operation.
nameplate along with CSA listed logo. Specific service conditions for these motors are defined in NFPA
70 (NEC) Article 500.
extensions, should be permanently guarded to prevent accidental contact by personnel. Accidental
contact with body parts or clothing can cause serious or fatal injury.
perform maintenance.
adequate for lifting only the motor. Disconnect the load (gears, pumps, compressors, or other driven
equipment) from the motor shaft before lifting the motor.
not exceed a 20 º angle from the shank of the eye bolt or lifting lug. Excessive lifting angles can cause
damage.
the maximum motor rated amps listed on the rating plate.
in NEMA MG1 and MG2 standards to avoid equipment damage.
nameplate. If the marked ambient and/or voltage are exceeded this maximum surface temperature can
be exceeded and can damage the motor windings. If applied in a division 2 or zone 2 environment this
excessive temperature may cause ignition of hazardous materials.
If you have any questions or are uncertain about any statement or procedure, or if you require additional
information please contact your Baldor distributor or an Authorized Baldor Service Center.
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.
Handling The motor should be lifted using the lifting lugs or eye bolts provided.
Caution: 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.
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 the hood of a WPII motor.
2. To avoid condensation inside the motor, do not unpack until the motor has reached room temperature.
(Room temperature is the temperature of the room in which it will be installed). The packing provides
insulation from temperature changes during transportation.
3. When lifting a WPII (Weather Proof Type 2) motor, do not lift the motor by inserting lifting lugs into holes on
top of the cooling hood. These lugs are to be used for hood removal only. A spreader bar should be used
to lift the motor by the cast lifting lugs located on the motor frame.
4. 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. Do not lift the assembly
using the motor lugs or eye bolts provided. Lugs or eye bolts are designed to lift motor only. 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. 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.
1-2 General Information MN408
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 reclosing 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 dened as Kilo−Volts.)
Example: For a 480VAC rated motor Rm =1.48 meg−ohms (use 5 M Ω).
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 rmly 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 ºC (50 ºF) to 49 ºC (120 ºF) 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.
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 Baldor District
ofce.
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 relled
to the indicated level with the specied lubricant, (see Maintenance). The shaft should be rotated
monthly by hand at least 10 to 15 revolutions to distribute oil to bearing surfaces.
d. “Provisions for oil mist lubrication” – These motors are packed with grease. Storage procedures are
the same as paragraph 5b.
e. “Oil Mist Lubricated” – These bearings are protected for temporary storage by a corrosion inhibitor.
If stored for greater than 3 months or outdoor storage is anticipated, connected to the oil mist
system while in storage. If this is not possible, add the amount of grease indicated under “Standard
Condition” in Section 3, then rotate the shaft 15 times by hand.
General Information 1-3MN408
6. All breather drains are to be fully operable while in storage (drain plugs removed). The motors must be
stored so that the drain is at the lowest point. All breathers and automatic “T” drains must be operable to
allow breathing and draining at points other than through the bearings around the shaft. Vertical motors
should be stored in a safe stable vertical position.
7. Coat all external machined surfaces with a rust preventing material.
An acceptable product for this purpose is Exxon Rust Ban # 392.
8. Carbon brushes should be lifted and held in place in the holders, above the commutator, by the brush
holder ngers. The commutator should be wrapped with a suitable material such as cardboard paper as a
mechanical protection against damage.
Non−Regreaseable Motors
Non−regreasable 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 tting) on the bottom of each bracket prior
to lubricating the motor.
2. The motor with regreasable 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 Baldor District ofce.
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 rmly against the
bearing and prevent damage during movement.
1-4 General Information MN408
Equipment Marking for IEC Certified Product
Temperature Class
AT
Mark
PlaceofManufacture
IEC certied products have special markings that identify the protection concept and environment
requirements. An example is shown in Figure 1-1.
Figure 1-1 IEC Certified Product Markings
Ex Protection Concept (ExnA)
GasGroup (IIC)
AmbientRange
ExnA MOTOR
ATEX Specific
Markingof
ExplosionProtection
EX EquipmentGroup andCategory(II3)
Type of Atmosphere: G--Gas,D-- Dust (G)
Specific Conditions of Use:
If the motor certicate number is followed by the symbol “X”, this indicates that the motor has specic
conditions of use which are indicated on the certicate. It is necessary to review the product certication
certicate 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 specied in the certication
documents or on motor nameplates. It is necessary to consult the adjustable speed drive
manual for proper set up. IECEx Certicates are available online at www.iecex.com
Unit Conversions
Inches to Millimeters Inches x 25.4 = mm
Millimeters to Inches mm x .03937 = Inches
Horsepower to Kilowatts Hp x .746 = Kw
Kilowatts to Horsepower Kw x 1.341 = Hp
Pounds to Kilograms Lbs x .454 = Kg
Kilograms to Pounds Kg x 2.205 = Lbs
ExnA IICGcTamb ºCto ºC
II 3G IP______
Sira__________________
IECEx__________________
MFG. BY BALDOR ELECTRIC FORT SMITH, AR 72901USA
European Conformity
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 lters which may be recommended for EMC compliance.
For additional information, consult Baldor MN1383.
General Information 1-5MN408
1-6 General Information MN408
Section 2
Installation & Operation
Overview Installation should conform to the National Electrical Code as well as local codes and practices. When other
devices are coupled to the motor shaft, be sure to install protective devices to prevent future accidents.
Some protective devices include, coupling, belt guard, chain guard, shaft covers etc. These protect against
accidental contact with moving parts. Machinery that is accessible to personnel should provide further
protection in the form of guard rails, screening, warning signs etc.
Location It is important that motors be installed in locations that are compatible with motor enclosure and ambient
conditions. Improper selection of the motor enclosure and ambient conditions can lead to reduced operating
life of the motor.
Proper ventilation for the motor must be provided. Obstructed airow can lead to reduction of motor life.
1. Open Drip−Proof/WPI motors are intended for use indoors where atmosphere is relatively clean, dry, well
ventilated and non−corrosive.
2. Totally Enclosed and WPII motors may be installed where dirt, moisture or dust are present and in
outdoor locations.
Severe Duty, IEEE 841 and Washdown Duty enclosed motors are designed for installations with high corrosion
or excessive moisture conditions. These motors should not be placed into an environment where there is the
presence of ammable or combustible vapors, dust or any combustible material, unless specically designed
for this type of service. IEEE841 motors are suitable for application in Class I Division 2 and Class I Zone 2
areas on sine wave power in accordance with the applicable codes and standards.
Hazardous Locations are those where there is a risk of ignition or explosion due to the presence of
combustible gases, vapors, dust, bers, or yings. Facilities requiring special equipment for hazardous
locations are typically classied in accordance with local requirements. In the US market, guidance is provided
by the National Electric Code.
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.
Mounting Location
The motor should be installed in a location compatible with the motor enclosure and specic ambient. To allow
adequate air ow, the following clearances must be maintained between the motor and any obstruction:
Table 2-1 Enclosure Clearance
TEFC / TENV ( IC0141 ) Enclosures
Fan Cover Air Intake 180 − 210T Frame 1” ( 25mm)
Fan Cover Air Intake 250 − 449T Frame 4” (100mm)
IEC 112 − 132 1” ( 25mm)
IEC 160 − 280 4” (100mm)
Exhaust Envelope equal to the P Dimension on the motor
OPEN/Protected Enclosures
Bracket Intake Same as TEFC
Frame Exhaust Exhaust out the sides envelope
dimension sheet
A minimum of the P dimension plus 2” (50mm)
Exhaust out the end same as intake.
The motor must be securely installed to a rigid foundation or mounting surface to minimize vibration and
maintain alignment between the motor and shaft load. Failure to provide a proper mounting surface may cause
vibration, misalignment and bearing damage.
Foundation caps and sole plates are designed to act as spacers for the equipment they support. If these
devices are used, be sure that they are evenly supported by the foundation or mounting surface.
When installation is complete and accurate alignment of the motor and load is accomplished, the base should
be grouted to the foundation to maintain this alignment.
The standard motor base is designed for horizontal or vertical mounting. Adjustable or sliding rails are
designed for horizontal mounting only. Consult your Baldor distributor or authorized Baldor Service Center for
further information.
Installation & Operation 2-1MN428
Frame Mounting Holes
Top View
Allows F-1 to F-2 Conversion on 8 hole
200M, 225S, 250S, 280S, (IEC)
For short frame designations 182, 213,
254, 284, 324, 364, 404, 444 (NEMA)
250M, 280M
Some motors have standardized frames containing 6 or 8 mounting holes. 6 hole frames are not suitable for
eld reversal of mounting from F−1 to F−2, etc. Figure 2-1 indicates the proper mounting holes to use.
Figure 2-1 6 & 8 Hole Motor Frame Mounting
frames.
Not present on 6 hole frames.
Not used on 8 hole frames.
Shaft
For long frame designations 184, 215,
256, 286, 326, 365, 405, 445 (NEMA)
(IEC) 112M, 132M, 160L, 200L, 225M,
Caution: 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.
In the case of assemblies on a common base, any lifting means provided on the motor should not be used
to lift the assembly and base but, rather, 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.
Likewise, precautions should be taken to prevent hazardous overloads due to deceleration, acceleration or
shock forces.
Alignment Accurate alignment of the motor with the driven equipment is extremely important. The pulley, sprocket,
or gear used in the drive should be located on the shaft as close to the shaft shoulder as possible. It is
recommended to heat the pulley, sprocket, or gear before installing on the motor shaft. Forcibly driving a unit
on the motor shaft will damage the bearings.
1. Direct Coupling
2. End-Play Adjustment
3. Pulley Ratio
Caution: Do not over tension belts. Excess tension may damage the motor or driven equipment.
4. Belt Drive
Doweling & Bolting
After proper alignment is veried, dowel pins should be inserted through the motor feet into the foundation.
1. Drill dowel holes in diagonally opposite motor feet in the locations provided.
2. Drill corresponding holes in the foundation.
3. Ream all holes.
4. Install proper tting dowels.
5. Mounting bolts must be carefully tightened to prevent changes in alignment.
Always use these holes, closer to the
shaft 112S, 132S, 160M, 180M,
For direct drive, use exible couplings if possible. Consult the drive or equipment manufacturer for more
information. Mechanical vibration and roughness during operation may indicate poor alignment. Use dial
indicators to check alignment. The space between coupling hubs should be maintained as recommended
by the coupling manufacturer.
The axial position of the motor frame with respect to its load is also extremely important. The standard
motor bearings are not designed for excessive external axial thrust loads. Improper adjustment will cause
failure.
The best practice is to not exceed an 8:1 pulley ratio.
Align sheaves carefully to minimize belt wear and axial bearing loads (see End-Play Adjustment). Belt
tension should be sufcient to prevent belt slippage at rated speed and load. However, belt slippage may
occur during starting.
This will maintain the correct motor position should motor removal be required.
(Baldor•Reliance motors are designed for doweling.)
2-2 Installation & Operation MN428
Use a at washer and lock washer under each nut or bolt head to hold the motor feet secure.
Flanged nuts or bolts may be used as an alternative to washers.
WARNING: Guards must be installed for rotating parts such as couplings, pulleys, external fans, and unused shaft
extensions, should be permanently guarded to prevent accidental contact by personnel.
Accidental contact with body parts or clothing can cause serious or fatal injury.
Guarding Guards must be installed for rotating parts such as couplings, pulleys, external fans, and unused shaft
extensions. This is particularly important where the parts have surface irregularities such as keys, key ways or
set screws. Some satisfactory methods of guarding are:
1. Covering the machine and associated rotating parts with structural or decorative parts of the driven
equipment.
2. Providing covers for the rotating parts. Covers should be sufciently rigid to maintain adequate guarding
during normal service.
Power Connection
Motor and control wiring, overload protection, disconnects, accessories and grounding should conform to the
National Electrical Code and local codes and practices.
For ExnA hazardous location motors, it is a specic condition of use that all terminations in a conduit box
be fully insulated. Fully insulated and lugged terminations must be bolted and provided with lock washer to
prevent rotation. Flying leads must be insulated with two full wraps of electrical grade insulating tape or heat
shrink tubing.
Grounding In the USA consult the National Electrical Code, Article 430 for information on grounding of motors and
generators, and Article 250 for general information on grounding. 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 national or local code applicable.
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 difcult 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:
Cross sectional area of phase
conductors, S
2
mm
Minimum cross sectional area of the
corresponding protective conductor, S
2
mm
p
S< 16 S
16 < S < 35 16
S>35 0,5 S
Equipotential bonding connection shall made using a conductor with a cross-sectional area of at least 4 mm
Conduit Box For ease of making connections, an oversize conduit box is provided. Most conduit boxes can be rotated
360 º in 90 º increments. Auxiliary conduit boxes are provided on some motors for accessories such as space
heaters, RTD’s etc.
Installation & Operation 2-3MN428
2
.
AC Power Motors with ying lead construction must be properly terminated and insulated.
* Note RTD may have 2−Red/1−White leads; or 2−White/1−Red Lead.
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 2-3.
Figure 2-2 Accessory Connections
One heater is installed in each end of motor.
Leads for each heater are labeled H1 & H2.
(Like numbers should be tied together).
TD1
TD2
Leads are labeled TD1 & TD2.
Winding RTDs are installed in windings (2) per phase.
Three thermistors are installed in windings and tied in series.
Each set of leads is labeled
1TD1, 1TD2, 1TD3, 2TD1, 2TD2, 2TD3 etc.
* One bearing RTD is installed in Drive endplate (PUEP), leads
are labeled RTDDE.
* One bearing RTD is installed in Opposite Drive endplate (FREP), leads
are labeled RTDODE.
Rotation
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 drive instructions for maximum acceptable motor lead lengths, and proper grounding.
Note: Main power leads for CE Marked Motors may be marked U,V,W – for standard congurations,
please consult connection diagrams.
Caution: The space heaters are designed to operate at or below the maximum surface temperature stated on the
nameplate. If the marked ambient and/or voltage are exceeded this maximum surface temperature can
be exceeded and can damage the motor windings. If applied in a division 2 or zone 2 environment this
excessive temperature may cause ignition of hazardous materials.
2-4 Installation & Operation MN428
Connection Diagrams
Installation & Operation 2-5MN428
Connection Diagrams Continued
2-6 Installation & Operation MN428
Figure 2-3 Typical Motor Performance VS Voltage Variations
+20
Full -Load
Current
+15
+10
Power
+5
Factor
0
Efficiency
−5
−10
Changes in Motor Performance (%)
−15
Maximum
−20
Torque
−15 −10 −5 0 +5 +10 +15
Maximum
Torque
Full -Load
Current
Efficiency
Power
Factor
Voltage Variations (%)
Initial Lubrication
Baldor•Reliance 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 (regreasable 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.
Caution: Shaker Duty motors must be properly lubricated prior to Start Up to prevent damage. See Section 3.
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.
Verify rotation direction before you continue.
9. Start the motor and ensure operation is smooth without excessive vibration or noise.
If so, run the motor for 1 hour with no load connected.
Installation & Operation 2-7MN428
10. After 1 hour of operation, disconnect power and connect the load to the motor shaft.
Verify all coupling guards and protective devices are installed. Ensure motor is properly ventilated.
11. 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.
Coupled Start Up
This procedure assumes a coupled start up. Also, that the rst 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 rst 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 specied 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
distributor or Baldor Service Center.
Hazardous Locations
Hazardous locations are those where there is a risk of ignition or explosion due to the presence of combustible
gases, vapors, dust, bers or yings.
Selection Facilities requiring special equipment for hazardous locations are typically classied in accordance with
Protection Concepts
local requirements. In the US market, guidance is provided by the National Electric Code. In international
hazardous location areas, guidance for gas / vapor / mist classication is given in IEC60079−14, or for dust in
IEC61241−14. This classication process lets the installer know what equipment is suitable for installation in
that environment, and identies what the maximum safe temperature or temperature class is required.
It is the customer or users responsibility to determine the area classication and select proper equipment.
Areas are classied with respect to risk and exposure to the hazard. In the US market, areas are typically
classied as follows Class, Division, Group and Temperature Class. In some newer installations in the US and
in most international markets, areas are classied in Zones.
Class I Division 1 / Zone 1 [Equipment Group I (mining) or II (surface), Equipment Protection Level (EPL)
Gb, Mb ]
Baldor offers a range of motors suitable for installation in a Division 1 or Zone 1 environment.
These motors are known as explosion proof or ameproof.
Motors that are explosion proof or ameproof use specially machined ameproof 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 t of these ameproof joints are designed to contain the combustion or quench the ame of an explosive
gas atmosphere prior to it exiting the motor. These ameproof joints have lengths and widths selected and
tested based on the gas group present in the atmosphere. Baldor•Reliance motors are typically designed to
meet Class I (Division 1) Group C and D (explosion proof) or Ex d IIB (ameproof).
An application note regarding equipment applied in accordance with the US National Electric Code (NFPA
70−2008) − according to Article 500.8(C) Marking, sub clause (2) in the ne print note, it is noted that
Equipment not marked to indicate a division is suitable for both Division 1 and Division 2 locations.
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
ameproof or explosion proof motors are designed to contain the combustion and extinguish any ame
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.
2-8 Installation & Operation MN428
If thermostats are provided as a condition of certication, it is the installer’s responsibility to make sure that
these devices are properly connected to a suitable switching device. The ATEX directive requires that motor
shutdown on thermal trip be accomplished without an intermediate software command. Where intermediate
circuitry is involved the circuit shall fall within the scope of a safety, controlling and regulating device as dened
in article 1(2) of European Directive 94/9/EC, and shall be covered by an appropriate EC Type Examination
Certicate.
Flameproof motors, internationally referred to as Ex d use a protection concept similar to that used in Class
I Division 1 motors, with minor differences in the ameproof joints and cable entry designs. Flameproof and
explosion proof motors are both type tested. Representative motors are connected to a reference gas and
ignited in laboratory conditions to verify that the ame is not transmitted outside the motor enclosure and to
determine the maximum internal pressure encountered.
Explosion proof and Flame proof motors shipped without a conduit box require use of a certied box of
suitable dimensions and that is appropriate for the classication. Openings in connection boxes must be
closed with suitably certied and dimensioned device.
Hazardous location motors equipped with NPT pipe nipples are designed and built such that the pipe nipple is
securely attached to the motor frame. This is accomplished externally by interference between the threads as
well as tack welding. The conduit box is securely attached to the pipe nipple at the factory per:
1. Standard Commercial NPT & Explosion Proof IEC/ATEX parts : L-1 gauging notch +/- 1 thread (ref.
ANSI/ASME B1.20.1 and Clarication Sheet ExNB/98/06/010/CS) Note: Clarication Sheet
ExNB/98/06/010/CS provides inspection criteria to meet (6 threads minimum per engineering part drawing
for ATEX parts).
2. Explosion Proof UL conduit boxes & MSHA parts: L-1 gauging notch “+1 min to + 3 1/2 max threads.
Note: Provides inspection criteria to meet (5 threads minimum per engineering part drawing for MSHA parts
and meet UL 1203 requirement for L-1 gauging notch ush to + 3 1/2 max threads).
This allows the end user to position the conduit box according to the application then secure when in place.
For obvious reasons having the conduit box snug prior to afxing to the pipe nipple is preferable. However, the
guidance in numbers 1 and 2 above can be used in determining thread engagement.
Note: In the United States most non-mining applications have rigid conduit for cabling, therefore not tack
welding the conduit box to the pipe nipple is standard. In markets outside the United States, exible
conduit/cabling are common and end users should take note to secure the conduit box to the pipe nipple
once in position. Further, the exible leads should be secured to inhibit forces acting on the conduit box.
Class I Division 2 / Zone 2 Ex nA, [Equipment Protection Level (EPL) Gc ]
This protection concept relies on having no sources of ignition present such as arcing parts or hot surfaces.
For this protection concept, internal temperatures as well as external temperatures are considered. In many
cases, the internal temperatures are higher than the external temperatures and therefore become the limiting
factor in determination of temperature code designation. In these applications, it is very important to use a
motor that has been evaluated thermally for use with an inverter or converter, if variable speed operation is
desired. Thermostats used for Class I Division 2 and Ex nA motors are used to protect the motor only. For
motors using ying lead construction, it is important to use connection lugs and insulate with heat shrink
tubing or a double wrap of insulation grade electrical tape to avoid the risk of spark or ignition.
Class II Division 1 / Zone 21 [Equipment Group III, Equipment Protection Level (EPL) Db ]
This area classication is one where the risk of ignitable concentrations of dust is present at all or some of the
time. The protection concepts used for Class II Division 1 is similar to amepath, except with additional dust
exclusion paths designed for the rotating shaft. In the international designations, this concept is referred to as
dust ignition proof or Ex tD. External surface temperature remains the limiting factor. 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 certication, it is the
installer’s responsibility to make sure that these devices are properly connected to a suitable switching device.
Note: In the North American area classication system, Class III exists for bers and yings.
In the IEC designation, both dusts and yings are absorbed into Group III.
Class II Division 2 / Zone 22 [Equipment Group III, Equipment Protection Level (EPL) Dc ]
This area classication is one where the risk of exposure to ignitable concentrations of dust are not likely
to occur under normal operating conditions and relies heavily on the housekeeping practices within the
installation.
Sine Wave Power Operation for Division 1 or 2 and Zone 1 or 2 and Zone 21 or 22 Hazardous Location.
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 Division 1 or 2 / Zone 1 or 2 and Zone 21 or 22 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.
Installation & Operation 2-9MN428
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
9. Motor reversing
10. Single phase operation of polyphase equipment
11. Variable frequency operation
Variable Frequency Power Operation for Division 1 or 2 and Zone 1 or 2 and Zone 21 or 22
Hazardous Location (motors with maximum surface temperature listed on the nameplate).
Only motors with nameplates marked for use on inverter (variable frequency) power, and labeled for specic
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 (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 Division 1 or 2 / Zone 1 or 2 and Zone 21 or 22 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 classied locations, thermal
limiting devices should only be used for winding protection and not considered for limiting all internal motor
temperatures to specic 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 modied.
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 ow 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 baseplate, it may also be necessary to electrically bond
together the stationary parts of the motor and the coupled equipment.
2-10 Installation & Operation MN428
Repair of Motors used in Hazardous Locations
Repair of hazardous certied motors requires additional information, skill, and care. It is the customer’s
responsibility to select service shops with proper qualications 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 Class I Division 1 and Zone 1
In the North American market, recertication programs are offered by Underwriters Laboratories and Canadian
Standards Association which allow authorized service shops to mark the rebuilt motors as certied. 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 certied
repair facility is desired, consult the IECEX Repair Scheme at http://www.iecex.com/service_facilities.htm
Explosion proof and ameproof motors achieve their safety based on the mechanical construction −
ameproof joints and bearing clearance, and the electrical design including any thermal limiting devices. If it is
necessary to repair a ameproof or explosion proof motor, it is critical that the mechanical ameproof joints be
maintained. Consult Baldor Electric Company for ameproof joint construction details.
Use only Baldor•Reliance supplied parts. Baldor 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.
Repair of Dust Ignition Proof Motors − Class II Division 1 and 2, Zone 21 and 22.
For Dust Ignition Proof, proper sealing is required. Do not modify the motor construction to add any additional
opening, and ensure that proper sealing is maintained in the connection box and at the shaft seal. 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
Repair of Class I Division 2 and Zone 2 motors
For Division 2 and Zone 2, the internal and external temperatures are of concern. 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. Use only Baldor replacement thermostats, if provided.
Installation & Operation 2-11MN428
2-12 Installation & Operation MN428
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
Inspect the motor at regular intervals, approximately every 500 hours of operation or every 3 months,
whichever occurs rst. Keep the motor clean and the ventilation openings clear. The following steps should be
performed at each inspection:
WARNING: 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.
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 can occur and cause early motor failure.
2. Perform a dielectric with stand test periodically to ensure that the integrity of the winding insulation has
been maintained. Record the readings. Immediately investigate any signicant decrease in insulation
resistance.
3. Check all electrical connectors to be sure that they are tight.
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. Baldor motors are pregreased, normally with
Ball Bearing Motors
Roller Bearing Motors
Polyrex EM (Exxon Mobil) or as stated on the nameplate.
Do not mix greases unless compatibility has been checked and veried.
Operating Temperature −25 ºC (−15 ºF) to 50 ºC (120 ºF)
EXXON POLYREX EM (Standard on Baldor motors)
EXXON UNIREX N2
EXXON BEACON 325
CHEVRON OIL SRI NO. 2 ( Compatible with Polyrex EM )
CHEVRON OIL BLACK PEARL
TEXACO, INC. PREMIUM RB
TEXACO, INC. POLYSTAR
AMOCO RYKON # 2
PENNZOIL PENNZLUBE EM−2
DARMEX DARMEX 707
DARMEX DARMEX 711
PETRO−CANADA PEERLESS LLG
SHELL OIL DOLIUM BRB
Minimum Starting Temperature −60 ºC (−76 ºF)
SHELL OIL CO. AEROSHELL 7 (Standard on Baldor motors)
MOBIL MOBIL 28
MOBIL MOBILITH SHC 100 (Low Temperature − Arctic Duty)
Operating Temperature −25 ºC (−15 ºF) to 50 ºC (120 ºF)
TEXACO, INC. PREMIUM RB
MOBIL MOBILITH SHC 220 (Standard on Baldor motors)
CHEVRON OIL BLACK PEARL
Maintenance & Troubleshooting 3-1MN408
Relubrication Intervals
Recommended relubrication intervals are shown in Table 3-1. It is important to realize that the recommended
intervals of Table 3-2 are based on average use.
Refer to additional information contained in Tables 3-2, 3-3 and 3-4.
Table 3-1 Relubrication Intervals *
NEMA /
(IEC) Frame Size
Up to 210 incl. (132) ** 2700 Hrs. 5500 Hrs. 12000 Hrs. 18000 Hrs. 22000 Hrs.
Over 210 to 280 incl. (180) ** 3600 Hrs. 9500 Hrs. 15000 Hrs. 18000 Hrs.
Over 280 to 360 incl. (225) ** * 2200 Hrs. 7400 Hrs. 12000 Hrs. 15000 Hrs.
Over 360 to 449 incl. (315) ** *2200 Hrs. 3500 Hrs. 7400 Hrs. 10500 Hrs.
* Relubrication intervals are for ball bearings.
For vertically mounted motors and roller bearings, divide the relubrication interval by 2.
** For motors operating at speeds greater than 3600 RPM, contact Baldor for relubrication
recommendations.
Severity of Service Hours per day of
Standard 8 40 ºC Clean, Little Corrosion
Severe 16 Plus 50 ºC Moderate dirt, Corrosion
10000 6000 3600 1800 1200 900
Table 3-2 Service Conditions
Ambient Temperature
Operation
Rated Speed - RPM
Atmospheric Contamination
Maximum
Extreme 16 Plus >50 ºC* or Class H Insulation Severe dirt, Abrasive dust, Corrosion,
Low Temperature <−29 ºC **
* Special high temperature grease is recommended (Dow Corning DC44). Note that Dow Corning DC44
grease does not mix with other grease types. Thoroughly clean bearing & cavity before adding grease.
** Special low temperature grease is recommended (Aeroshell 7).
Table 3-3 Relubrication Interval Multiplier
Severity of Service Multiplier
Standard 1.0
Severe 0.5
Extreme 0.1
Low Temperature 1.0
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).
Heavy Shock or Vibration
3-2 Maintenance & Troubleshooting MN408
Table 3-4 Bearings Sizes and Types
Frame Size
NEMA (IEC)
Bearing
Weight of Grease to
add * oz (Grams)
Volume of grease to be added
3
in
teaspoon
56 to 140 (90) 6203 0.08 (2.4) 0.15 0.5
140 (90) 6205 0.15 (3.9) 0.2 0.8
180 (100−112) 6206 0.19 (5.0) 0.3 1.0
210 (132) 6307 0.30 (8.4) 0.6 2.0
250 (160) 6309 0.47 (12.5) 0.7 2.5
280 (180) 6311 0.61 (17) 1.2 3.9
320 (200) 6312 0.76 (20.1) 1.2 4.0
360 (225) 6313 0.81 (23) 1.5 5.2
400 (250) 6316 1.25 (33) 2.0 6.6
440 (280) 6318 1.52(40) 2.5 8.2
440 (280) 6319 2.12 (60) 4.1 13.4
5000 to 5800 (315−355) 6328 4.70 (130) 9.2 30.0
5000 to 5800 (315−355) NU328 4.70 (130) 9.2 30.0
360 to 449 (225−280) NU319 2.12 (60) 4.1 13.4
AC Induction Servo
76 Frame 180 (112) 6207 0.22 (6.1) 0.44 1.4
77 Frame 210 (132) 6210 0.32 (9.0) 0.64 2.1
80 Frame 250(160) 6213 0.49 (14.0) 0.99 3.3
Bearing Description (These are the “Large” bearings (Shaft End) in each frame size)
* Weight in grams = .005 DB of grease to be added
Note: Not all bearing sizes are listed. For intermediate bearing sizes, use the grease volume for the next larger
size bearing.
Caution: To avoid damage to motor bearings, grease must be kept free of dirt. For an extremely dirty
environment, contact your Baldor distributor or an authorized Baldor Service Center for additional
information.
Relubrication Procedure Be sure that the grease you are adding to the motor is compatible with the grease
already in the motor. Consult your Baldor distributor or an authorized service center if a grease other than the
recommended type is to be used.
Caution: Do not over−lubricate motor as this may cause premature bearing failure.
With Grease Outlet Plug
1. With the motor stopped, clean all grease ttings with a clean cloth.
2. Remove grease outlet plug.
Caution: 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.
Maintenance & Troubleshooting 3-3MN408
Without Grease Provisions
Note: Only a Baldor authorized and UL or CSA certied service center can disassemble a UL/CSA listed
explosion proof motor to maintain it’s UL/CSA listing.
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 ºC
and the atmosphere is moderately corrosive.
1. Table 3-2 list 9500 hours for standard conditions.
2. Table 3-3 classies severity of service as “Severe”.
3. Table 3-5 shows that 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.
Shaker Duty Motors only
Caution: Shaker Duty motors must be properly lubricated prior to Start Up to prevent damage. See Table 3-6.
Lubrication should be performed before Start Up and at regular maintenance intervals.
Follow these recommendations to ensure proper lubrication.
Recommended Lubricant
For ambient temperatures between −15 ºF to 120 ºF the following lubricants are recommended:
Mobil PolyrexEM, Texaco Premium RB, Exxon Unirex N−2.
Do not mix greases unless compatibility has been checked and veried.
Table 3-5 Lubrication Volume
Volume in Cubic Inches
NEMA Frame Size
184TY 1.4 0.5 1.4 0.5 2.7 0.5
215TY 1.6 0.5 1.6 0.5 4.5 1
256TY 7 1 11 2
286TY 9 1 15 3
Normal Duty Severe Duty Extreme Duty
Start Up Relub Start Up Relub Start Up Relub
Lubrication Frequency
Normal Duty 8 hours per day (16 hours per day in a clean environment). Lubricate every 2 months.
Severe Duty 16 hours per day or more in a dirty environment (corrosive atmosphere, chemical fumes, acids,
alkalies or extreme high humidity). Lubricate every month or 700 hours of operation.
Extreme Duty operation in extremely dirty or dusty environments and high ambient temperatures exceeding
104 ºF (40 ºC). Lubricate twice a month or 350 hours of operation.
Lubrication Procedure
1. Locate the grease inlet and outlet. Clean the areas.
2. Remove the plug(s) and install a grease tting in the inlet if grease tting is not already installed.
3. Add the recommended amount of lubricant.
4. Run the motor for two hours with the outlet plug removed.
5. Install outlet plug.
Note: To loosen hardened grease it may be necessary to insert a rod or wire into the grease inlet and outlet
holes.
3-4 Maintenance & Troubleshooting MN408
Table 3-6 Troubleshooting Chart
Symptom Possible Causes Possible Solutions
Motor will not start
Excessive humming
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.
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.
Single Phasing. Check current at all phases (should be approximately
equal) to isolate and correct the problem.
Improper ventilation. Check external cooling fan to be sure air is moving
properly across cooling ns.
Excessive dirt build-up on motor. Clean motor.
Unbalanced voltage. Check voltage at all phases (should be approximately
Motor Over Heating
equal) to isolate and correct the problem.
Rotor rubbing on stator. Check air gap clearance and bearings.
Tighten “Thru Bolts”.
Over voltage or under voltage. Check input voltage at each phase to motor.
Open stator winding. Check stator resistance at all three phases for balance.
Grounded winding. Perform dielectric test and repair as required.
Improper connections. Inspect all electrical connections for proper termination,
clearance, mechanical strength and electrical continuity.
Refer to motor lead connection diagram.
Misalignment. Check and align motor and driven equipment.
Excessive belt tension. Reduce belt tension to proper point for load.
Excessive end thrust. Reduce the end thrust from driven machine.
Bearing Over Heating
Excessive grease in bearing. Remove grease until cavity is approximately 3/4 lled.
Insufcient grease in bearing. Add grease until cavity is approximately 3/4 lled.
Dirt in bearing. Clean bearing cavity and bearing. Repack with correct
grease until cavity is approximately 3/4 lled.
Misalignment. Check and align motor and driven equipment.
Rubbing between rotating parts and
Isolate and eliminate cause of rubbing.
stationary parts.
Vibration
Rotor out of balance. Have rotor balance checked are repaired at your Baldor
Service Center.
Resonance. Tune system or contact your Baldor Service Center for
assistance.
Noise
Foreign material in air gap or ventilation
openings.
Remove rotor and foreign material. Reinstall rotor. Check
insulation integrity. Clean ventilation openings.
Bad bearing. Replace bearing. Clean all grease from cavity and new
Growling or whining
bearing. Repack with correct grease until cavity is
approximately 3/4 lled.
Maintenance & Troubleshooting 3-5MN408
Suggested bearing and winding RTD setting guidelines for Non−Hazardous Locations ONLY
Most large frame AC Baldor motors with a 1.15 service factor are designed to operate below a Class B
(80 ºC) temperature rise at rated load and are built with a Class H winding insulation system. Based on this
low temperature rise, RTD (Resistance Temperature Detectors) settings for Class B rise should be used as a
starting point. Some motors with 1.0 service factor have Class F temperature rise.
The following tables show the suggested alarm and trip settings for RTDs. Proper bearing and winding RTD
alarm and trip settings should be selected based on these tables unless otherwise specied for specic
applications.
If the driven load is found to operate well below the initial temperature settings under normal conditions, the
alarm and trip settings may be reduced so that an abnormal machine load will be identied.
The temperature limits are based on the installation of the winding RTDs imbedded in the winding as specied
by NEMA. Bearing RTDs should be installed so they are in contact with the outer race on ball or roller bearings
or in direct contact with the sleeve bearing shell.
Table 3-7 Winding RTDs − Temperature Limit In ºC (40 ºC Maximum Ambient)
Motor Load
(Typical Design)
< Rated Load 130 140 155 165 175 185
Rated Load to 1.15 S.F. 140 150 160 165 180 185
Note: • Winding RTDs are factory production installed, not from Mod−Express.
When Class H temperatures are used, consider bearing temperatures and relubrication requirements.
Table 3-8 Bearing RTDs − Temperature Limit In oC (40 ºC Maximum Ambient)
Bearing Type Oil or
Grease
Standard* 95 100 85 95
High Temperature** 110 115 105 110
Notes: * Bearing temperature limits are for standard design motors operating at Class B temperature rise.
** High temperature lubricants include some special synthetic oils and greases.
Greases that may be substituted that are compatible with Polyrex EM (but considered as “standard” lubricants
include the following:
− Texaco Polystar − Rykon Premium #2 − Chevron SRI #2
− Mobilith SHC−100 − Pennzoil Pennzlube EM−2 − Chevron Black Pearl
− Darmex 707 − Darmex 711 − Petro−Canada Peerless LLG
See the motor nameplate for replacement grease or oil recommendation.
Contact Baldor application engineering for special lubricants or further clarications.
Class B Temp Rise
< 80 ºC
Alarm Trip Alarm Trip Alarm Trip
Anti−Friction Sleeve
Alarm Trip Alarm Trip
Class F Temp Rise
< 105 ºC
Class H Temp Rise
< 125 ºC
3-6 Maintenance & Troubleshooting MN408
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
MN408
All Rights Reserved. Printed in USA.
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