400 Baldor Motors Manual

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Integral Horsepower
AC Induction Motors
ODP, WPI, WPII Enclosure
TEFC Enclosure
Explosion Proof

Installation & Operating Manual

2/07

MN400

Table of Contents
Section 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐1
1‐1

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐1

Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐2

Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐4

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐4

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐4

Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1‐4

Section 2
Installation & Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐1
2‐1

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐1

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐1

Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐1

Doweling & Bolting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐2

Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐2

Conduit Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐2

AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐2

First Time Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐4

Coupled Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐4

Jogging and Repeated Starts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2‐4

Section 3
Maintenance & Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐1
3‐1

Lubrication & Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐1

Type of Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐1

Relubrication Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐1

Relubrication Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐3

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐4

Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3‐5

MN400

Table of Contents i

Section 1
General Information

ii Table of Contents

MN400

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:
S
NEMA Publication MG‐2, Safety Standard for Construction and guide
for Selection, Installation and Use of Electric Motors and Generators.
S
The National Electrical Code
S
Local codes and Practices

Limited Warranty
1. Most Baldor products are warranted for 18 months from the date of shipment to Baldor's customer from Baldor's
district warehouse or, if applicable, from Baldor's factory. Baldor Standard-E® standard efficient motors are
warranted for 24 months. Standard-E is limited to three phase, general purpose, 1-200 HP ratings that fall under
the Energy Policy Act (EPAct). Baldor Super-E® premium efficient motors are warranted for 36 months. Baldor
IEEE841 motors are warranted for 60 months. All warranty claims must be submitted to a Baldor Service Center
prior to the expiration of the warranty period.
2. Baldor will, at its option repair or replace a motor which fails due to defects in material or workmanship during the
warranty period if:
a. the purchaser presents the defective motor at or ships it prepaid to, the Baldor plant in Fort Smith, Arkansas
or one of the Baldor Authorized Service Centers and
b. the purchaser gives written notification concerning the motor and the claimed defect including the date
purchased, the task performed by the Baldor motor and the problem encountered.
3. Baldor will not pay the cost of removal of any electric motor from any equipment, the cost of delivery to Fort Smith,
Arkansas or a Baldor Authorized Service Center, or the cost of any incidental or consequential damages resulting
from the claimed defects. (Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above exclusion may not apply to you.) Any implied warranty given by laws shall be limited to
the duration of the warranty period hereunder. (Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.)
4. Baldor Authorized Service Centers, when convinced to their satisfaction that a Baldor motor developed defects in
material or workmanship within the warranty period, are authorized to proceed with the required repairs to fulfill
Baldor's warranty when the cost of such repairs to be paid by Baldor does not exceed Baldor's warranty repair
allowance. Baldor will not pay overtime premium repair charges without prior written authorization.
5. The cost of warranty repairs made by centers other than Baldor Authorized Service Centers WILL NOT be paid
unless first authorized in writing by Baldor.
6. Claims by a purchaser that a motor is defective even when a failure results within one hour after being placed into
service are not always justified. Therefore, Baldor Authorized Service Centers must determine from the condition
of the motor as delivered to the center whether or not the motor is defective. If in the opinion of a Baldor
Authorized Service Center, a motor did not fail as a result of defects in material or workmanship, the center is to
proceed with repairs only if the purchaser agrees to pay for such repairs. If the decision is in dispute, the
purchaser should still pay for the repairs and submit the paid invoice and the Authorized Service Center's signed
service report to Baldor for further consideration.
7. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

MN400

General Information 1‐1

Safety Notice:

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 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.

1‐2 General Information

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.

WARNING:

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. National Electrical Code and Local codes
must be carefully followed.

WARNING:

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

WARNING:

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.

WARNING:

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.

WARNING:

Avoid the use of automatic reset devices if the automatic restarting
of equipment can be hazardous to personnel or equipment.

WARNING:

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.

WARNING:

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.

WARNING:

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.

WARNING:

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

WARNING:

Do not use non UL/CSA listed explosion proof motors in the
presence of flammable or combustible vapors or dust. These
motors are not designed for atmospheric conditions that require
explosion proof operation.

MN400

Section 1
General Information
Safety Notice Continued
WARNING:

Motors that are to be used in flammable and/or explosive
atmospheres must display the UL label on the nameplate along with
CSA listed logo.
Specific service conditions for these motors are defined in
NFPA 70 (NEC) Article 500.

WARNING:

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

Caution:

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

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 adequate for lifting only the
motor. Disconnect the load from the motor shaft before moving the
motor.

Caution:

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.

Caution:

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.

Caution:

If a HI POT test (High Potential Insulation test) must be performed,
follow the precautions and procedure in NEMA MG1 and MG2
standards to avoid equipment damage.

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.

MN400

General Information 1‐3

Section 1
General Information
Receiving

Storage

Unpacking

Handling

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.

If the motor is not put into service immediately, the motor must be stored in a clean, dry
and warm location. Several precautionary steps must be performed to avoid motor
damage during storage.
1.

Use a “Megger” periodically to ensure that the integrity of the winding insulation
has been maintained. Record the Megger readings. Immediately investigate
any significant drop in insulation resistance.

2.

Do not lubricate bearings during storage. Motor bearings are packed with
grease at the factory. Excessive grease can damage insulation quality.

3.

Rotate motor shaft at least 10 turns every two months during storage (more
frequently if possible). This will prevent bearing damage due to storage.

4.

If the storage location is damp or humid, the motor windings must be protected
from moisture. This can be done by applying power to the motors' space
heater (if available) while the motor is in storage.

Each Baldor motor is packaged for ease of handling and to prevent entry of
contaminants.
1.

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.

2.

When the motor has reached room temperature, remove all protective wrapping
material from the motor.

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 the hood of a WPII motor.

2.

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.

3.

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 using
the motor lugs or eye bolts provided.
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.

1‐4 General Information

MN400

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 airflow 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 flammable or
combustible vapors, dust or any combustible material, unless specifically designed for
this type of service.

Mounting

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.
After 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.

Alignment

Accurate alignment of the motor with the driven equipment is extremely important.
1.

Direct Coupling
For direct drive, use flexible 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.

2.

End‐Play Adjustment
The axial position of the motor frame with respect to its load is also extremely
important. The motor bearings are not designed for excessive external axial thrust
loads. Improper adjustment will cause failure.

3.

Pulley Ratio
The pulley ratio should not exceed 8:1.

4.

Belt Drive
Align sheaves carefully to minimize belt wear and axial bearing loads (see End‐Play
Adjustment). Belt tension should be sufficient to prevent belt slippage at rated speed
and load. However, belt slippage may occur during starting.

Caution:
5.

MN400

Do not over tension belts.

Sleeve bearing motors are only suitable for coupled loads.

Installation & Operation 2‐1

Section 1
General Information
Doweling & Bolting

Power Connection

After proper alignment is verified, dowel pins should be inserted through the motor feet
into the foundation. This will maintain the correct motor position should motor removal be
required. (Baldor motors are designed for doweling.)
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 fitting dowels.

5.

Mounting bolts must be carefully tightened to prevent changes in alignment. Use a
flat 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.

Motor and control wiring, overload protection, disconnects, accessories and grounding
should conform to the National Electrical Code and local codes and practices.

Conduit Box

For ease of making connections, an oversize conduit box is provided. The box can be
rotated 360° in 90° increments. Auxiliary conduit boxes are provided on some motors for
accessories such as space heaters, RTD's etc.

AC Power

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 2‐2.

Figure 2‐1 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).

Three thermisters are installed in windings and tied in series.
Leads are labeled T1 & T2.

Winding RTDs are installed in windings (2) per phase.
Each set of leads is labeled W1, W2, W3, W4, W5, & W6.
* 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.
* Note RTD may have 2-Red/1-White leads; or 2-White/1-Red Lead.

2‐2 Installation & Operation

MN400

Section 1
General Information
Figure 2‐2 Typical Motor Performance VS Voltage Variations
+20

Maximum
Torque

Full ‐Load
Current

Changes in Motor Performance (%)

+15

+10

+5

Full ‐Load
Current

Power
Factor

0

-5

Efficiency

Efficiency

-10

-15

Power
Factor

Maximum
Torque

-20
-15

-10

-5

0

+5

+10

+15

Voltage Variations (%)

MN400

Installation & Operation 2‐3

Section 1
General Information
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
with a Megger.

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.

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.

Coupled Start Up

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 distributor or Baldor Service Center.

2‐4 Installation & Operation

MN400

Section 3
Maintenance & Troubleshooting
WARNING:

General Inspection

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:
WARNING:

Relubrication & Bearings

Type of Grease

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

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.

Use a “Megger” periodically to ensure that the integrity of the winding
insulation has been maintained. Record the Megger readings. Immediately
investigate any significant drop in insulation resistance.

3.

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

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.
A high grade ball or roller bearing grease should be used. Recommended grease for
standard service conditions is Polyrex EM (Exxon Mobil).
Equivalent and compatible greases include:
Texaco Polystar, Rykon Premium #2, Pennzoil Pen 2 Lube and Chevron SRI.

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 contained in Tables 3‐2, 3‐3 and 3‐4.

Table 3‐1 Relubrication Intervals *
NEMA / (IEC) Frame Size
Up to 210 incl. (132)
Over 210 to 280 incl. (180)
Over 280 to 360 incl. (225)
Over 360 to 5800 incl. (300)

10000
**

6000
2700 Hrs.
**
**
**

Rated Speed ‐ RPM
3600
1800
5500 Hrs.
12000 Hrs.
3600 Hrs.
9500 Hrs.
* 2200 Hrs. 7400 Hrs.
*2200 Hrs.
3500 Hrs.

1200
18000 Hrs.
15000 Hrs.
12000 Hrs.
7400 Hrs.

900
22000 Hrs.
18000 Hrs.
15000 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.

MN400

Maintenance & Troubleshooting 3‐1

Table 3‐2 Service Conditions
Severity of Service
Standard
Severe
Extreme

Hours per day
of Operation
8
16 Plus
16 Plus

Low Temperature

Ambient Temperature
Maximum
40° C
50° C
>50° C* or
Class H Insulation
<-29 ° C **

Atmospheric
Contamination
Clean, Little Corrosion
Moderate dirt, Corrosion
Severe dirt, Abrasive dust, Corrosion, Heavy
Shock or Vibration

*

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
Standard
Severe
Extreme
Low Temperature

Multiplier
1.0
0.5
0.1
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).

Table 3‐4 Bearings Sizes and Types

Frame Size
NEMA (IEC)
56 to 140 (90)
140 (90)
180 (100-112)
210 (132)
250 (160)
280 (180)
320 (200)
360 (225)
400 (250)
440 (280)
5000 to 5800 (315-450)
5000 to 5800 (315-450)
360 to 449 (225-280)
AC Induction Servo
76 Frame 180 (112)
77 Frame 210 (132)
80 Frame 250(160)
*

Bearing Description
(These are the “Large” bearings (Shaft End) in each frame size)
Volume of grease
Weight of Grease to
to be added
Bearing
add *
in3
teaspoon
oz (Grams)
6203
0.08 (2.4)
0.15
0.5
6205
0.15 (3.9)
0.2
0.8
6206
0.19 (5.0)
0.3
1.0
6307
0.30 (8.4)
0.6
2.0
6309
0.47 (12.5)
0.7
2.5
6311
0.61 (17)
1.2
3.9
6312
0.76 (20.1)
1.2
4.0
6313
0.81 (23)
1.5
5.2
6316
1.25 (33)
2.0
6.6
6319
2.12 (60)
4.1
13.4
6328
4.70 (130)
9.2
30.0
NU328
4.70 (130)
9.2
30.0
NU319
2.12 (60)
4.1
13.4
6207
6210
6213

0.22 (6.1)
0.32 (9.0)
0.49 (14.0)

0.44
0.64
0.99

1.4
2.1
3.3

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.

3‐2 Maintenance & Troubleshooting

MN400

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 fittings 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.

Without Grease Provisions
Note: Only a Baldor authorized and UL or CSA certified 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° C and the atmosphere is moderately corrosive.
1.

Table 3‐1 list 9500 hours for standard conditions.

2.

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

3.

Table 3‐4 shows that 1.2 in3 or 3.9 teaspoon of grease is to be added.

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

MN400

Maintenance & Troubleshooting 3‐3

Section 1
General Information
Table 3‐5 Troubleshooting Chart
Symptom
Motor will not start
Excessive humming
Motor Over Heating

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.
Over voltage or under voltage.
Open stator winding.
Grounded winding.
Improper connections.

Bearing Over Heating

Misalignment.
Excessive belt tension.
Excessive end thrust.
Excessive grease in bearing.
Insufficient grease in bearing.
Dirt in bearing.

Vibration

Misalignment.
Rubbing between rotating parts and
stationary parts.
Rotor out of balance.
Resonance.

Noise
Growling or whining

Foreign material in air gap or
ventilation openings.
Bad bearing.

3‐4 Maintenance & Troubleshooting

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.
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.

MN400

Suggested bearing and winding RTD setting guidelines
Most large frame AC Baldor motors with a 1.15 service factor are designed to operate
below a Class B (80°C) 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 specified for specific 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 identified.
The temperature limits are based on the installation of the winding RTDs imbedded in
the winding as specified 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.
Winding RTDs - Temperature Limit In 5C (405C Maximum Ambient)
Motor Load

Class B Temp Rise 3 80°C
(Typical Design)
Alarm
Trip
130
140
140
150

Class F Temp Rise 3 105°C

Class H Temp Rise 3 125°C

Alarm
Trip
Alarm
3 Rated Load
155
165
175
Rated Load
160
165
180
to 1.15 S.F.
Note: S Winding RTDs are factory production installed, not from Mod-Express.
S When Class H temperatures are used, consider bearing temperatures and relubrication requirements.

Trip
185
185

Bearing RTDs - Temperature Limit In 5C (405C Maximum Ambient)
Anti-Friction
Sleeve
Bearing Type
Oil or Grease
Alarm
Trip
Alarm
Standard*
95
100
85
High Temperature**
110
115
105
Note: * Bearing temperature limits are for standard design motors operating at Class B temperature rise.
** High temperature lubricants include some special synthetic oils and greases.

Trip
95
110

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 clarifications.

MN400

Maintenance & Troubleshooting 3‐5

3‐6 Maintenance & Troubleshooting

MN400

Baldor District Offices Baldor District Offices Baldor District Offices

BALDOR ELECTRIC COMPANY
World Headquarters
P.O. Box 2400 Fort Smith, AR 72901-2400
(479) 646-4711 Fax (479) 648-5792
www.baldor.com

© Baldor Electric Company
MN400

Printed in USA
2/07



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