US MOTORS Titan Horizontal User manual

Titan® Horizontal
Large AC Electric Motors
INSTALLATION,OPERATION
AND MAINTENANCE MANUAL
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INSTALLATION AND MAINTENANCE
SAFETY FIRST!
High voltage and rotating parts can cause serious injury or loss of life. Installation, operation, and
maintenance must be performed by qualified personnel. Familiarization with and adherence to
NEMA®†MG2, the National Electric Code, and local codes is recommended. It is important to observe
safety precautions to protect personnel from possible injury. Personnel should be instructed to:
1. Disconnect all power to motor and accessories prior to initiating any installation, maintenance or
repairs. Also ensure that driven equipment connected to the motor shaft will not cause the motor to
rotate (windmilling of fans, water flowing back through pump, etc.).
2. Avoid contact with rotating parts.
3. Act with care in accordance with this manual's prescribed procedures in handling and installing this equipment.
4. Be sure unit and accessories are electrically grounded and proper electrical installation wiring and
controls are used in accordance with local and national electrical codes. Refer to "National Electrical
Code Handbook" -NFPA No. 70. Employ qualified electricians.
5. Be sure equipment is properly enclosed to prevent access by children or other unauthorized
personnel in order to prevent possible accidents.
6. Be sure shaft key is fully captive before unit is energized.
7. Provide proper safeguards for personnel against rotating parts and applications involving high inertia
loads, which cause overspeed.
8. Avoid extended exposure to equipment with high noise levels.
9. Observe good safety habits at all times and use care to avoid injury to yourself or damage to equipment.
10. Be familiar with the equipment and read all instructions thoroughly before installing or working on equipment.
11. Observe all special instructions attached to the equipment. Remove shipping fixtures, if so equipped,
before energizing unit.
12. Check motor and driven equipment for proper rotation and phase sequence prior to coupling. Also
check if a unidirectional motor is supplied and note proper rotation.
13. Electric motors can retain a lethal charge even after being shut off. Certain accessories
(space heaters, etc.) are normally energized when the motor is turned off. Other accessories such as
power factor correction capacitors, surge capacitors, etc. can retain an electrical charge after being
shut off and disconnected.
14. Do not apply power correction capacitors to motors rated for operation with variable frequency drives.
Serious damage to the drive will result if capacitors are placed between the motor and drive.
Consult drive supplier for further information.
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Safety

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INSTALLATION AND MAINTENANCE
SECTION PAGE
SAFETY FIRST! 1
TABLE OF CONTENTS 2
1. SHIPMENT 3
2. HANDLING 3
3. STORAGE 4
3.1 WHEN TO PUT A MOTOR IN STORAGE.4
3.2 STORAGE PREPARATION 4
3.3 PERIODIC MAINTENANCE 5
3.4 START-UP PREPARATIONS AFTER STORAGE 7
4. INSTALLATION LOCATION 8
5. FOUNDATION 8
5.1 GROUTING 9
6. INITIAL INSTALLATION 9
6.1 COUPLING OR PULLEY INSTALLATION 9
6.2 ROUGH ALIGNMENT 10
6.3 FINAL ALIGNMENT 10
6.4 COUPLING REQUIREMENTS 12
6.5 ELECTRICAL CONNECTION 13
6.6 REVERSING ROTATION 13
6.7 INITIAL START 13
6.8 VIBRATION 14
6.9 DOWELING 15
7. ROUTINE MAINTENANCE 15
7.1 GENERAL MAINTENANCE 15
7.3 BEARINGS 16
7.4 BEARING INSULATION 16
7.5 BEARING LUBRICATION 17
7.6 BEARING REPLACEMENT 18
8. RENEWAL PARTS AND SERVICE 29
9. CUTAWAY DRAWINGS 30
10. TROUBLESHOOTING 49
11. INSTALLATION RECORD 52
Table of
Contents

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INSTALLATION AND MAINTENANCE
1. SHIPMENT
Prior to shipment, all TITAN® Line Motors undergo extensive electrical and mechanical testing and
are thoroughly inspected. Upon receipt of the motor, carefully inspect the unit for any signs of damage
that may have occurred during shipment. Should such damage be evident, unpack the motor at
once in the presence of a claims adjuster and immediately report all damage and breakage to the
transportation company and Nidec Motor Corporation.
When contacting Nidec Motor Corporation concerning the motor, be sure to include the complete
motor identification number, frame and type which appears on the nameplate (see installation record
in this manual).
2. HANDLING
The equipment needed to handle the motor includes a hoist and spreader bar arrangement of
sufficient strength to lift the motor safely. The spreader bar arrangement should be employed
whenever multiple lifting lugs or eyeballs are provided (See Figure 1A & 18.) The spreader bar
should have the lifting hooks positioned to equal the span of the eyeballs or lifting lugs. The eyeballs
or lifting lugs provided are intended to lift the motor weight only. See Table 7 for motor weights.
FIGURE 1A
Typical Construction With Four Lifting Lugs FIGURE 1B Typical Construction With Two Lifting Lugs
Shipment &
Handling
WARNING
Lifting the motor by other means may result in damage to the motor or injury to personnel
CAUTION
Do not move motor with oil sumps filled. Sloshing action of oil in sumps can result in oil leaks
and motor damage.

Storage
INSTALLATION AND MAINTENANCE
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3. STORAGE
3.1 When to put a Motor In Storage.
If a motor is not put into immediate service (one month or less), or it is taken out of service for a
prolonged period, special storage precautions should be taken to prevent damage. The following
schedule is recommended as a guide to determine storage needs.
A. Out of service or in storage less than one month -no special precautions except that space
heaters, if supplied, must be energized at any time the motor is not running.
B. Out of service or in storage for more than one month but less than six months -store per
Section 3.2 A, B, C, D, E, F (2) and G, Section 3.3 A, B and C, and Section 3.4.
C. Out of service or in storage for six months or more -all recommendations.
3.2 Storage Preparation
A. Where possible, motors should be stored indoors in a clean, dry area.
B. When indoor storage is not possible, the motors must be covered with a tarpaulin. This cover
should extend to the ground; however, it should not tightly wrap the motor. This will allow the
captive air space to breathe, minimizing formation of condensation. Care must also be taken
to protect the motor from flooding or from harmful chemical vapors.
C. Whether indoors or out, the area of storage should be free from excessive ambient vibration
which can cause bearing damage.
D. Precautions should be taken to prevent rodents, snakes, birds or other small animals from
nesting inside the motors. In areas where they are prevalent, precautions must be taken to
prevent insects, such as dauber wasps, from gaining access to the interior of the motor.
E. Inspect the rust preventative coating on all external machined surfaces, including shaft
extensions. If necessary, re-coat the surfaces with a rust preventative material, such as
RUST VETO®†No. 342 (manufactured by E.F. Houghton Co.) or an equivalent. The
condition of the coating should be checked periodically and surface re-coated as necessary.
F. Bearings:
(1) When storage time is six months or more, grease lubricated cavities must be
completely filled with lubricant. Remove the drain plug and fill cavity with grease until
grease begins to purge from drain opening. Refer to Section 7.5 and/or review motor's
lubrication nameplate for correct lubricant.
NOTICE
Immediately remove any shrink wrap used during shipping. Never wrap any motor in plastic for
storage. This can turn the motor into a moisture trap causing severe damage not cover by Nidec
Motor Corporation Company

Storage
INSTALLATION AND MAINTENANCE
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(2) Oil lubricated motors are shipped without oil. When storage time exceeds one (1)
month, the oil sumps must be filled to the maximum capacity as indicated on the oil
chamber sight gauge window. Refer to motor lubrication nameplate or Table 5 for
proper oil.
NOTE: Motor must not be moved with oil in reservoir. Drain oil before moving to prevent sloshing and
possible damage. With a clean cloth, wipe any excess oil from the threads of the drain plug
and the inside of the drain hole. Apply GASOILA®† or equivalent thread sealant to the threads
of the drain plug and replace the plug in the oil drain hole. Refill oil when motor has been
moved to the new location.
G. To prevent moisture accumulation, some form of heating must be utilized. This heating should
maintain the winding temperature at approximately 5'C above ambient. If space heaters are
supplied, they should be energized. If none are available, single phase or 'trickle' heating may
be utilized by energizing one phase of the motor's winding with a low voltage. Request the
required voltage and transformer capacity from Nidec Motor Corporation. A third option is to
use an auxiliary heat source and keep the winding warm by either convection or blowing
filtered warm air into the motor.
3.3 Periodic Maintenance
A. Oil should be inspected monthly for evidence of moisture or oxidation. The oil must be replaced
whenever contamination is noted or every twelve months; whichever occurs first. It is important
to wipe excess oil from the threads of the drain plug and the drain hole and to coat the threads
with GAS0ILA"1 or equivalent thread sealant before replacing the drain plug.
B. Grease lubricated bearings must be inspected once a month for moisture and oxidation by
purging a small quantity of grease through the drain. If any contamination is present, the
grease must be completely removed and replaced.
C. All motors must have the shaft rotated once a month to maintain a lubricant film on the
bearing races and journals.
D. Insulation Testing:
Two tests are used to evaluate the condition of the winding insulation. The first of these is the
one minute insulation resistance test (IR1) and the second is the polarization index test (Pl),
which can also be referred to as a dielectric absorption test. The results of either of these
tests can be skewed by factors such as the winding temperature and its relation to the dew
point temperature at the time the test was conducted. The Pl test is less sensitive to these
factors than the IR, test, but its results can still be affected significantly. Due to these factors,
the most reliable method for evaluating the condition of the winding insulation is to maintain
a record of periodic measurements, accumulated over months or years of service, for one or
both of these tests. It is important that these tests be conducted under similar conditions of
winding temperature, dew point temperature, voltage magnitude and duration, and relative
humidity. If a downward trend develops in the historical data for either test, or if the readings
from both tests drop below a minimum acceptable value, have an authorized electrical
apparatus service shop thoroughly clean and dry the winding, and retreat, if necessary.

Storage
INSTALLATION AND MAINTENANCE
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ĩ
ĩ
ĩ
The recommended procedure for the IR, test is as follows:
(1) Disconnect all external accessories or equipment that have leads connected to the winding
and connect them to a common ground. Connect all other accessories that are in contact with
the winding to a common ground.
(2) Using a megohmmeter, apply DC voltage at the level noted below for 1 minute and take a
reading of the insulation resistance between the motor leads and ground.
Rated Motor Voltage
Up to 1000 {inclusive)
1001 to 2500 {inclusive)
2501 to 5000 {inclusive)
5001 and up
Recommended DC Test Voltage
500 VDC
500 to 1000 VDC
500 to 2500 VDC
500 to 5000 VDC
(3) The reading should be corrected to a 40°C base temperature by utilizing the formula:
R
40C
= K
ĩ
R
ĩ
Where:
R40C = insulation resistance (in megohms) corrected to 40°C
K = insulation resistance temperature coefficient at temperature TºC
R = measured insulation resistance (in megohms) at temperature TºC
The value of Kr can be approximated by using the formula:
K = (0.5)(40-ĩ)10
Where:
ĩ= the winding temperaturein°Cthat the insulation resistance was measured atThe recommended
procedure for the Pl test is as follows:
The recommended procedure for the Pl test is as follows:
(1) Perform steps 1 and 2 from thr IR1test procedure. Heed the safety warnings given in the IR1
test procedure
WARNING
Follow appropriate safety procedures during and after high voltage testing. Refer to the
instruction manual for the test equipment. Make sure the winding insulation is discharged
before beginning the test. The winding Insulation will retain a potentially dangerous charge
after the DC voltage source is removed, so use proper procedures to discharge the winding
insulation at the end of the test. Refer to IEEE 43 Standard for additional safety information.
WARNING
Failure to have accessories grounded during this test can lead to the accumulation of a
hazardous charge on the accessories.

Storage
INSTALLATION AND MAINTENANCE
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(2) With DC voltage still being applied by the megohmmeter, take an additional reading of
insulation resistance between the motor leads and ground 10 minutes after the DC voltage
was initially applied. To minimize measurement errors, the variation in winding temperature
between the 1 minute and 10 minute readings should be kept to a minimum.
(3) Obtain the polarization index by taking the ratio of the 10 minute resistance reading to
the 1 minute resistance reading.
If historical data from previous IR1and/ or Pl tests is available, then a comparison of the
present test result to previous tests can be used to evaluate the condition of the insulation. To
minimize error, all readings that are compared should be taken at test voltages, winding
temperatures, dew point temperatures, and relative humidity that are as similar as possible. If
a downward trend in the readings develops over time, have an authorized electrical apparatus
service shop thoroughly clean and dry the winding and, if necessary, retreat the winding.
Then, repeat the tests and re-check results before returning the motor to service.
If historical data from previous IR1or Pl tests is not available, then compare readings from
the present test to the recommended minimum values listed below. If the readings from both
tests fall below the minimum, have an authorized electrical apparatus service shop
thoroughly clean and dry the winding and, if necessary, retreat the winding. Then, repeat the
tests and re-check results before returning the motor to service.
The recommended minimum value for the 1 minute insulation resistance reading corrected to 40°C is:
Rated Motor Voltage
Up to 999 (inclusive)
1000 and up
Minimum Insulation Resistance
5 Megohms
100 Megohms
The recommended minimum value for the polarization index is 2.0. If the 1 minute insulation
resistance reading corrected to 40 °C is above 5000 megohms, however, the polarization
index may not be meaningful. In such cases, the polarization index may be disregarded as a
measure of insulation condition.
Refer any questions to the Nidec Motor Corporation Product Service Department.
For more information, refer to the IEEE®†43 Standard.
3.4 Start-up Preparations After Storage
A. Motor should be thoroughly inspected and cleaned to restore to an 'As Shipped' condition.
B. Motors that have been subjected to vibration must be disassembled and each bearing
inspected for damage.
C. When storage time has been six (6) months or more, oil and/or grease must be completely changed
using lubricants and methods recommended on the motor's lubrication plate, or in Section 7.5.
D. The winding must be tested to obtain insulation resistance and dielectric absorption ratio as
described in Section 3.3, Item D.
E. Contact Nidec Motor Corporation Product Service Department prior to start-up if storage time
has exceeded one year.

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INSTALLATION AND MAINTENANCE
4. INSTALLATION LOCATION
When selecting a location for the motor and driven unit, keep the following items in mind.
The location should be clean, dry, well ventilated, properly drained and provide accessibility for
inspection, lubrication and maintenance. Ambient vibration should be kept to a minimum. Outdoor
installations on Open Drip proof motors require protection from the elements.
The location should also provide adequate space for motor removal without shifting the driven unit.
The temperature rise of a standard motor is based on operation atan altitude not higher than 3,300 feet above
sea level and a maximum ambient temperature of 40°C. See NEMA MG-1 20.28 for usual service condition.
To avoid condensation inside of motor, motors should not be stored or operated in areas subject to
rapid temperature changes unless they are energized or protected by space heaters.
The motor should not be installed in close proximity to any combustible material or where flammable gases
and/or dust may be present, unless motor is specifically built for that environment and is labeled accordingly.
Recommended Minimum Installation Clearances
This is a general guide and cannot cover all circumstances. Unusual arrangements should have
inquiries to Nidec Motor Corporation Product Service Department. Unusual arrangements might include
high ambient, limited ventilation, or a large number of motors in a confined space. The distance to the
wall is at the side or end of the motor. The distance to another motor is considered as surface to
surface and for side-by-side arrangements. This recommendation considers all motors to be mounted in
the same orientation (e.g. all main conduit boxes facing east).
SPEED
DISTANCE TO WALL
DISTANCE TO ANOTHER
MOTOR
3600 RPM
2 x MOTOR WIDTH
2 x MOTOR WIDTH
1800 RPM OR LESS
1 x MOTOR WIDTH
5. FOUNDATION
Concrete (reinforced as required) makes the best foundation, particularly for large motors and driven
units. A sufficient mass provides rigid support that minimizes deflection and vibration. It may be located
on soil, structural steel or building floors, provided that the total weight (motor, driven unit and
foundation) does not exceed the allowable bearing support. (Allowable bearing loads of structural steel
and floors can be obtained from engineering handbooks. Building codes of local communities give the
recommended allowable bearing loads of different types of soil.) It is recommended that a fabricated
steel base (sole plate) be used between the motor and the foundation. See Figure 2. Base foot pads
should be level and in the same plane.
Installation
Location &
Foundation

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INSTALLATION AND MAINTENANCE
5.1 Grouting
Grouting is the process of firmly securing equipment to a concrete base. This base is a continuation
of themainfoundation,designedto dampenany machinevibrationpresentand preventtheequipment
from shaking loose during operation. A serviceable and solid foundation can be laid only by careful
attention to proper grouting procedure.
In practicalterms'grout'is a plastic filler thatis pouredbetweenthemotorsoleplateand thefoundation
upon which it is to operate. Being plastic, it is expected to fill all spaces and cavities before it sets
or solidifies and becomes an integral part of the principal foundation. In order to function properly,
the principal foundation should be allowed to fully set through chemical reaction and dehydration
as recommended by the grout manufacturer, prior to motor installation.
FIGURE2
TYPICAL MOTOR
MOUNTING
ARRANGEMENT
6. INITIAL INSTALLATION
6.1 Coupling or Pulley Installation
Remove the shaft clamping device shipped on the motor (as applicable). Do not discard the
clamping device as it will be needed should the motor require transport in the future. Wash
protective coating from the motor shaft extension(s) with solvent. Install couplings or pulleys on
motor shaft per manufacturers' recommended fit and mounting practices.
Foundation &
Initial
Installation
CAUTION
Sleeve bearing motors are shipped without oil. Oil reservoirs must be filled during installation.
CAUTION
Hammering or pounding with a mallet to install couplings or pulleys will damage bearings.

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INSTALLATION AND MAINTENANCE
In belted applications, the driver pulley should be positioned as close to the shaft shoulder as
possible to assure longest bearing life and keep shaft bending moment to a minimum. Take care to
ensure that the inboard edge of the pulley hub does not ride-up on the shaft shoulder blend radius.
6.2 Rough Alignment
Inspect sole plate mounting pads and bottom of motor feet for dirt or irregularities that would
prevent proper seating.
Position and shim the motor such that the coupling hubs are aligned within 1/32 inch and the motor
shaft is level. The motor shaft must be slightly lower than the driven shaft to allow for final
adjustment shims. Shims and support mounting should provide support under the entire foot area.
6.3 Final Alignment
Accurate shaft alignment between motor and driven equipment is essential for trouble-free
operation. Improper alignment can result in vibration, bearing overload and excessive shaft
stresses. Flexible couplings may not adequately compensate for excessive misalignment.
Whenever aligning a motor to driven equipment, keep the following rules in mind:
•Do not place more than five shims in a shim pack under any one machine foot, as flexibility of
the shim pack will contribute to a soft foot condition.
•After any corrective adjustment, tighten foot bolts securely and recheck alignment.
•When making shim adjustments, change only one foot at a time.
Initial
Installation
CAUTION
For units with Sleeve Bearings:
Sleeve bearing motors should be direct-coupled to the driven equipment. See coupling
recommendations for recommended coupling type. Never use a pulley or sprocket as they
transmit unacceptable radial loads to the motor bearings.
CAUTION
For units with Antifriction Bearings:
Belt tension should not exceed the transmission drive manufacturers' recommendations.
Excessive belt tension reduces belt life. Overload due to over tensioning of belts reduces
bearing life and can induce shaft fatigue failure.
Excessive bending moment due to placing of pulley far out on shaft extension will reduce
bearing life and may lead to shaft fatigue failure.
Placing the pulley hub onto the shaft against the shaft shoulder blend radius may cause a
large stress riser in the shaft, resulting in shaft fatigue failure. Prevent this from occurring
by using a chamfered spacer ring or by chamfering the end of the hub bore.

Initial
Installation
INSTALLATION AND MAINTENANCE
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•Recheck alignment after the motor has been in service for approximately one week and
readjust as necessary.
A. Angular Alignment (See Figure 3A)
Checkforangularmisalignmentof motortodrivenunitshaft.(SeeFigure3A).Measuredistance
between coupling hub faces (with feeler gauges) at four places equally spaced around the
outside diameters. Position motor as necessary to be within the maximum allowable
misalignment of .001 inch per foot of coupling radius.
B. Parallel Alignment (See Figure 38)
Fasten a dial indicator onto one coupling hub with the indicator button on the cylindrical surface
of the opposite coupling hub. Rotate shafts together and take readings at four points, 90' apart.
Relocate motor until total indicator movement in full rotation does not exceed .002 inch. Transfer
indicator to opposite hub and repeat the parallel alignment procedure. Recheck angular
alignment as described in Step A.
FIGURE 3
FLEXIBLE COUPLINGS
C. Soft Foot Check
Check and correct any 'soft foot' condition to assure that equal pressure is exerted on each
motor foot by the following shimming procedure. Bolt all motor feet down solidly to the motor
bedplate or foundation. Mount the base of the dial indicator on the motor's foundation, and
place and zero out the indicator on the motor shaft or coupling. Back off one of the drive end
mounting bolts and check indicator for change in reading. Change should not exceed .001
inch. Shim at foot if required and go to other take-off end bolt. This procedure should be
repeated on the opposite end until no reading is greater than .001 inch.
D. Hot Alignment
It is possible for the motor shaft height to change relative to the driven equipment and this
should be compensated for during the alignment procedure. Recheck parallel alignment
(vertical) of coupled drive by repeating after normal operating temperature is reached. If
shimming is changed, repeat alignment procedure to the extent necessary to assure proper
alignment coupled drive by repeating after normal operating temperature is reached. If shimming
is changed, repeat alignment procedure to the extent necessary to assure proper alignment.

Initial
Installation
INSTALLATION AND MAINTENANCE
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Shaft Alignment Tolerances
Coupling
Type
Distance to the
Wall
Base
Foot
Flatness
Base
Coplanarity
Plumbness of
shaft(inch)
Base
Levelness
Perpendicularity
of flange(inch)
Concentricity
of pilot fit(inch)
Horizonal
Motors
0.001
Flexible Coupling
Short Coupling
Couplings with Spacers
Rigid Coupling
Offset
Misalignment
(inch)
Angular
Misalignment
(inch)
0.002
0.002/foot of Coupling Diameter
0.002
0.00035/inch of Spacer Length
0.0008
0.0004/foot of Coupling Diameter
Shims
1. The area of the shim should not be smaller than 80% of the area of motor foot.
2. No more than 5 total shims shall be placed under motor foot.
3. No more than 1 of those shims shall be less than 0.003 inches thickness
4. The sum of the three thinnest shims shall be 0.010 inches or greater.
6.4 Coupling Requirements
Standard sleeve bearing motors are not designed to withstand axial thrust loads. Machines that
are to be driven by motors with sleeve bearings should be designed to take all the thrust load. The
driven equipment shaft should have its axial end play limited as necessary to prevent
applying any axial load to the motor sleeve bearings.
Operating experience on horizontal sleeve bearing motors has shown that sufficient thrust to
damage bearings may be transmitted to the motor through some flexible couplings. This requires
that a limited end float coupling, in accordance with the following is used.
FIGURE 4
A. Gear Type
B. Tapered Grid Type
C. Disk Type with Positive Stops
D. Roller Chain Type
E. Rubber Biscuit Type
A+ B = TOTAL MIN ROTOR END FLOAT
C = TOTAL MAX COUPLING END FLOAT

Initial
Installation
INSTALLATION AND MAINTENANCE
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Table 1 -Coupling End Play and Rotor Float
MOTOR HP
SYNCHRONOUS
SPEED OF MOTOR
(RPM)
TOTAL MINIMUM
MOTOR ROTOR END
FLOAT (IN.)
TOTAL MAXIMUM
COUPLING END
FLOAT (IN.)
500 & Below
1800 & Below
0.25
0.09
300 to 500 included
3600 & 3000
0.50
0.19
600 & Higher
All Speeds
0.50
0.19
6.5 Electrical Connection
Refer to the motor nameplate for power supply requirements and to the connection diagram for
connection parameters. Be sure connections are tight. Recheck carefully and assure that they
agree with the connection diagram. Insulate all connections to ensure that they will not short
against each other or to ground. Be sure the motor is grounded to guard against electrical shock.
Refer to the National Electrical Code Handbook (NFPA No. 70) and to local electrical codes for
proper wiring, protection and wire sizing. Be sure proper starting equipment and protective
devices are used for every motor. For assistance, contact the motor starter manufacturer. Apply the
above precautions to all accessories as well.
6.6 Reversing Rotation
The direction of rotation may be reversed by interchanging any two of the three power phases to
the motor leads. Be sure that the power is off and steps are taken to prevent accidental starting of
the motor before attempting to change any electrical connections.
6.7 Initial Start
After installation is completed, but before motor is put in regular service, make an initial start as follows:
A. Ensure that motor and control device connections agree with wiring diagrams.
B. Ensure that voltage, phase and frequency of line circuit (power supply) agree with motor nameplate.
C. Check insulation resistance according to Section 3 'Storage', Part 3.3.
CAUTION
Some motors have unidirectional ventilating fans. Running such a unit in reverse for any extended
length of time will result in motor damage. On motors that are unidirectional, the direction of rotation
is noted by an arrow mounted on the motor and by a warning plate mounted near the main
nameplate. To determine direction of rotation for which leads are connected, apply power
momentarily and observe rotation. Motor should be uncoupled from driven equipment to ensure
driven equipment is not damaged by reverse rotation, Motor coupling may require removal of
support if motor is operated uncoupled from driven equipment

Initial
Installation
INSTALLATION AND MAINTENANCE
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D. Check all foundation and base bolts to ensure that they are tight.
E. If motor has been in storage, either before or after installation, refer to Section 3 'Storage', Part 3.4.
F. Check for proper or desired rotation. See Part 6.6 of this section.
G. Ensure that all protective devices are connected and are operating properly.
H. Check sleeve bearing housings to be certain that they have been filled to the 'MAX' level with
the correct lubricant recommended in the instruction manual and lubrication plate.
I. Run motor at minimum possible load long enough to be certain that no unusual condition
develops. Listen and feel for excessive noise, vibration, clicking or pounding. If any are
present, stop motor immediately. Investigate the cause and correct before putting motor into
service. In the case of vibration, see Part 6.8 of this section.
J. When checks are satisfactory to this point, increase the load slowly up to rated load and check
unit for satisfactory operation.
6.8 Vibration
Motors are supplied as standard in accordance with NEMA MG-1, Section 7, which dictates that
the motor no-load vibration when mounted on a resilient base shall not exceed the limits as
outlined in the following table:
TABLE 2
NO-LOAD VIBRATION LIMITS
Speed, RPM
Rotational Frequency, Hz
Velocity, Inches per
second peak
3600
60
0.15
1800
30
0.15
1200
20
0.15
900
15
0.12
720
12
0.09
600
10
0.08
If vibration is deemed excessive, check for and correct any misalignment and/or 'soft foot' condition
per Part 6.3 of this section.
CAUTION
Repeated trial starts can overheat the motor (particularly for across-the-line starting) or the
external starting equipment. If repeated trial starts are made, allow sufficient time between
starts to permit heat to dissipated from windings and controls to prevent overheating.
Refer to Starting Duty Nameplate (if supplied and NEMA MG1-12.54, MG1-20.11 and
MG1-20.12 for allowable starting frequency and load inertia (WR2).

Routine
Maintenance
INSTALLATION AND MAINTENANCE
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6.9 Doweling
Doweling the motor (and driven unit) accomplishes the following:
•Restricts movement of the motor and driven unit.
•Eases realignment if motor is removed from base.
•Temporarily restrains the motor, should mounting bolts loosen.
The following procedure for inserting dowel pins is recommended.
A. Check the alignment after the unit has been operational approximately one week.
Correct if necessary.
B. Drill through motor feet on drive end and into base. Use holes in motor feet (if provided) as
a pilot. Drill diameter must be slightly smaller than the intended dowel size to allow for
reaming operation.
C. Ream holes in the feet and base to the proper diameter for the pins (light press fit).
D. Insert dowel pins.
7. ROUTINE MAINTENANCE
Start the motor in accordance with the standard instructions for the starting equipment used.
Connected load should be reduced to the minimum, particularly for reduced voltage starting and/or high
inertia connected loads, until the unit has reached full speed.
7.1 General Maintenance
Routine maintenance prevents costly shutdown and repairs. Major elements of a controlled
maintenance program include:
A. Trained personnel who KNOW the work.
B. Systematic records, which contain at least the following:
(1) Complete nameplate data.
(2) Prints (wiring diagrams, certified outline dimensions).
(3) Alignment data (departures from perfect alignment, allowance for temperature).
(4) Winding resistance and temperature.
(5) Results of regular inspection, including vibration and bearing temperature data as applicable.
(6) Documentation of any repairs.
(7) Lubrication data (method of application, type of lubricant used, maintenance
cycle by location).

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Maintenance
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7.2 Inspection & Cleaning
Stop the motor before cleaning. Clean the motor, inside and outside, regularly. The frequency depends
upon actual conditions existing around the motor. Use the following procedures, as they apply:
A. Wipe any contaminants from external surfaces of the motor.
B. Remove dirt, dust or debris from ventilating air inlets. Use compressed air as necessary.
Never allow dirt to accumulate near air inlets. Never operate motor with the air passages
blocked or restricted.
C. Clean motors internally by vacuuming or blowing with clean, dry compressed air. Generally,
a pressure not exceeding 30 PSI is recommended. When dirt and dust are solidly packed, or
windings are coated with oil or greasy grime, disassemble the motor and clean with solvent.
Useonlyhigh-flashnaphtha,mineral spirits,orStoddardsolvent.Wipe with solvent dampened
cloth or use suitable soft bristle brush. DO NOT SOAK. Oven dry (150 -175 ° F)
solvent- cleaned windings thoroughly before assembly.
D. After cleaning and drying the windings, check the insulation resistance. Refer to Section 3.3.
7.3 Bearings
Proper care will help prolong the life of the motor bearings. Ensure the alignment, belt tension
and lubrication is properly maintained.
Motors are supplied with different types of bearings based on application and rating. Bearings supplied
are either anti-friction or sleeve type bearings. Bracket construction varies with the type of bearing.
Brackets for anti-friction bearings are one piece while those of sleeve bearing have split hubs.
7.4 Bearing Insulation
To prevent bearing damage from circulating current, one or both bearings may be insulated.
Either the shaft or the bearing may be insulated. Note that not all motors are equipped with
insulated bearings.
During overhauls, an insulation resistance check may be performed to assure that the insulation
has not been weakened or damaged. Resistance can be checked by the use of an ohmmeter.
On sleeve bearing units with both bearings insulated, the bearing grounding strap must be
disconnected before testing.
DANGER
Assure against accidental starting of motor. Disconnect and lock out power before working
on equipment. See 'Safety" section.
CAUTION
When using compressed air, always use proper eye protection to prevent accidental injury.

Routine
Maintenance
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7.5 Bearing Lubrication
A. Relubrication
If motor is being taken out of storage, refer to 'Storage' - Section 3.4 for preparation instructions.
For units with Sleeve Bearings:
Select a premium-quality turbine oil which is fully inhibited against rust and oxidation. Refer to
Table 5 for recommendations. Oil Pour Point must be below the minimum starting temperature
unless sump heaters are used. Oil Viscosity Index must be at least 90.
Add oil to the bearing at the oil fill hole located at the top of each bearing housing. Oil level should be
between the 'Maximum' and 'Minimum' lines located on the housing sight gauge windows. Also fill
constant level oilers, if supplied. Refer to motor nameplate for approximate quantity of oil required.
For units with Antifriction Bearings:
Units with grease lubricated bearings are pre-lubricated at the factory and normally do not require
initial lubrication. Relubrication interval depends upon speed, type of bearing and service. Refer to
Table 3 for suggested relubrication intervals. Note that operating
environment and application may dictate more frequent lubrication.
To relubricate bearings, remove grease drain plug. Inspect grease drain and remove any blockage.
Add new grease at the grease inlet. New grease must be compatible with grease already in the
motor (refer to Tables 3 and 4 for compatible greases and replenishment quantities).
Run motor for 15 to 30 minutes with the grease drain plug removed to allow purging of any excess
grease. Shut off unit and replace drain plug. Put motor back into operation.
DANGER
Assure against accidental starting of motor, Disconnect and lock out power before working
on equipment, See 'Safety' section.
CAUTION
Oil 'Pour Point' temperature must be below the minimum starting air temperature to ensure
adequate bearing lubrication at startup. If this cannot be achieved by oil selection alone
then sump heaters should be specified and used to preheat the oil.
CAUTION
Greases of different bases (lithium, polyurea, clay, etc.) may not be compatible when mixed.
Mixing such greases can result in reduced lubricant life and premature bearing failure.
Prevent such intermixing by disassembling motor, remove all old grease and repackaging
with new grease. (Refer to Table 4 for recommended grease).

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Maintenance
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7.6 Bearing Replacement
For units with Antifriction Bearings:
A. Disassembly
See Figure 5 for Bearing Housing Cross-Section.
(1) Ensure power is disconnected.
(2) Remove grills, fan cover, fan, air scoops, and/or weather-protected top hat as required.
(3) Loosen and remove bearing cap screws.
(4) Remove bearing temperature detectors as applicable.
(5) Remove bracket-to-stator bolts and remove brackets.
(6) If bearings are to be replaced, remove bearings from rotor shaft with a bearing puller.
Pull on inner bearing race to remove bearing without damage.
Hazardous Location Motors: (Underwriter's Laboratories Requirements)
These motors are built to specifications approved by Underwriter's Laboratories. Assembly and
inspection is made by authorized personnel at our factory before the Underwriter's Label is affixed.
The Label is void if the unit is disassembled at other than a Nidec Motor Corporation plant of
manufacture or a Nidec Motor Corporation authorized and U.L. approved service shop, unless
specific approval for such action is obtained from Underwriter's Laboratories.
CAUTION
Over-greasing can cause excessive bearing temperatures, premature lubricant breakdown
and bearing failure. Care should be exercised against over-greasing.
DANGER
Ensure against accidental starting of motor. Disconnect and lock out power before working
on equipment. See 'Safety' section.

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Maintenance
INSTALLATION AND MAINTENANCE
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FIGURE 5
Antifriction Bearing Housing Construction
1. BEARING BRACKET
2. BEARING CAP
3. BEARING
4. GREASE FILL FITTING
5. GREASE DRAIN PLUG
B. Reassembly
(1) Clean all machined and matting surfaces on bearing caps, bracket fits, etc.
(2) Remove old grease from grease cavities and bearings.
(3) Carefully inspect bearings for nicks, dents or any unusual wear patterns. Damaged
bearings must be replaced.
(4) If motor is supplied with insulated bearing or insulated bearing shaft journals, inspect for
damage and repair as necessary before reassembly.
(5) Reassemble motor by reversing the disassembly procedure in Section 7.6 -Bearing
Replacement -'Disassembly'. Bearings should be installed per bearing
manufacturer's recommended procedure. Pack bearings and housings with grease per
Tables 3 and 4.
(6) Torque bolts per values in Table 6.
(7) Touch up any scratched or chipped paint to protect motor surfaces
For units with Sleeve that have A "Z" marked on bearing:
A. Disassembly
See Figure 6 for Bearing Housing Cross-Section.
(1) Ensure power is disconnected.
(2) Drain oil from sumps.
(3) Remove grills, fan cover, fan, air scoops, etc.