Installation, Operation
and Maintenance Manual
AC Induction Motors
• Frames L180 - L440
• Specifically designed for use with Adjustable
Frequency AC Drives
2 AC Induction Motors
General Description The motors described in this publication are high performance motors
specifically designed for use with adjustable frequency drives. The
basic design includes Class H insulation, 1.0 service factor, 40 degree
C ambient, continuous duty. Standard enclosures are totally enclosed
blower cooled, totally enclosed fan-cooled, non-ventilated and dripproof force ventilated. Modifications and accessories are available.
Important: These motors are equipped with metric hardware.
ATTENTION:Only qualified electrical personnelfamiliar
!
with the construction and operation of this equipment and
the hazards involved should install, adjust, operate, and/or
service this motor. Read and understand this manual in its
entirety before proceeding. Failure to observe this
precaution could result in personal injury or loss of life.
Table of Contents General Description
Receiving and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Installation
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Drain Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Conduit Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Stub Shaft Installation Procedure . . . . . . . . . . . . . . . . . . . . 6
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Encoder Connection Diagrams . . . . . . . . . . . . . . . . . . . . . 10
Motor Application Data
Maximum Safe Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Minimum V-Belt Sheave Diameters . . . . . . . . . . . . . . . . . .12
Shaft Extension and Method of Drive . . . . . . . . . . . . . . . . 12
Shaft Loads - Axial and Radial . . . . . . . . . . . . . . . . . . . . . 13
Operation
Motor Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maintenance
Lubrication - Frames L180 - L400 . . . . . . . . . . . . . . . . . . . 17
Repacking Bearings or Greasing New Bearings . . . . . . . . 18
Disassembly and Reassembly Instructions
Axial Float . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Anti-Friction Bearing Assemblies . . . . . . . . . . . . . . . . . . . .19
Bearing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Bracket Re-Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Stub Shaft Removal Procedure . . . . . . . . . . . . . . . . . . . . . 20
Replacement Bearings/Spare Parts . . . . . . . . . . . . . . . . . 21
Parts Identification Drawing . . . . . . . . . . . . . . . . . . . . . . . . 22
Total Service Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Receiving and Handling Acceptance
Thoroughly inspect this equipment before accepting shipment from
the transportation company. If any of the goods called for in the bill of
lading or express receipt are damaged or the quantity is short, do not
accept them until the freight or express agent makes an appropriate
notation on your freight bill or express receipt. If any concealed loss
or damage is discovered later, notify your freight or express agent at
once and request him to make an inspection. We are willing to assist
you in collecting claims for loss or damage in shipment; however, this
willingness on our part does not remove the transportation company's
responsibility in reimbursing you for collection of claims or
replacement of material. Claims for loss or damage in shipment must
not be deducted from the invoice, nor should payment of the invoice
be withheld awaiting adjustment of such claims, as the carrier
guarantees safe delivery.
If considerable damage has been incurred and the situation is urgent,
contact the nearest Allen-Bradley Sales Office for assistance. Please
keep a written record of all such communications.
AC Induction Motors 3
Handling
ATTENTION: Eyebolt(s) or lifting lug(s) are intended for
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!
In all cases, care should be taken to assure lifting in the direction
intended in the design of the lifting means. Lift using all lugs
provided. Likewise, precautions should be taken to prevent hazardous
overloads due to deceleration, acceleration or shock forces.
Angle of lift with rope or chain must be greater than 45 degrees from
horizontal.
For unusual conditions, such as side-wall and ceiling mounting of
horizontal motors or installation of vertical motors shipped in a
horizontal position, special precautions must be taken. It is
recommended that an experienced rigger be employed.
lifting the motor only with the standard accessories such as
tachometer, brakes, etc., mounted by Allen-Bradley. The
lifting means on the motor must not be used to lift the unit
plus additional equipment. Failure to observe this
precaution could result in personal injury.
ATTENTION: Eyebolts may unscrew during lifting.
Verify that eyebolts are tight and secure from turning, or lift
the unit on a sling or platform. Failure to observe this
precaution could result in personal injury.
4 AC Induction Motors
Storage
Motors must be stored in a clean, dry area protected from extremes of
temperature, moisture, shock and vibration. Storage temperatures of
10 to 49 degrees C (50 to 120 degrees F) with a maximum relative
humidity of 60% must be observed. In addition, motors subjected to
extended storage must be handled and treated per the requirements
specified in publication “Motors-5.0.” This publication is available
from your Allen-Bradley Sales Office or online at:
http://www.controlmatched.com.
All drains to be fully operable while in storage, and/or the 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 at points other than through the bearing fits.
Installation Allen-Bradley AC motors are designed and built in accordance with
Safety Standard for Construction and Guide for Selection,
Installation and Use Of Electric Motors And Generators published by
the National Electrical Manufacturers Association (NEMA),
publication MG-2-1983 (ANSI C51.5). It is recommended that this
publication be referred to whenever you select or install any AC
motor.
The application of motors and other electrical equipment in
hazardous locations is restricted by the National Electric Code. Users
must observe these regulations and consult with local code inspection
and enforcement agencies to insure compliance.
Location
Locate the machine where the ambient temperature is not over 40
degrees C (104 degrees F) and where clean air has free access to
ventilating intake and outlet openings. Except for machines with a
suitable protective enclosure, the location should be clean and dry.
Important: The cooling system on standard totally enclosed, blower
cooled motors requires clean air tobe forced through ducts
which are integral to the stator frame. It is important that
these air passages be kept clean and that sufficient
clearance be provided on the blower motor air inlets and
stator duct outlets for unrestricted flow of air.
For Drip-Proof Force Ventilated Enclosures, sufficient clearance must
be provided on all inlet and outlet openings to provide for unrestricted
flow of air. Separately ventilated motors with exhaust to ambient
(pipe-in only) must have at least 152.4 mm (6 in.) of clearance
between the opening and adjacent walls or floor.
Important: Motors located in a damp, moist environment must have
space heaters to protect against condensation when motor
is not operating.
AC Induction Motors 5
Drain Plugs
If motor is totally enclosed, it is recommended that condensation
drain plugs be removed. These are located in the lower portion of the
end-shields (not included on L180 frames). Totally enclosed “XT”
motors are equipped with automatic drains which should be left in
place as received.
Power Supply
This is an adjustable speed motor designed for operation with
adjustable frequency drives.
Verify that the motor nameplate data corresponds to the drive output
rating and follow the Drive User Manual for motor installation and
connection.
Conduit Box
The standard conduit box location for totally enclosed motors is top
mounted for F1-F2 versatility without motor disassembly. For dripproof force ventilated, F1 is standard. Conduit box can be rotated in
90 degree increments for lead outlet at front, back or sides. On L180
frame motors the conduit box is mounted on the top for all enclosure
types.
Mounting
Motors must be mounted on a rigid, solid base or foundation. Poor
base construction may cause resonances in the motor/base assembly
which can result in bearing failure and other motor damage. All hold
down bolts must be the correct grade for the type of mounting and
must be torqued to their recommended value.
Table A
Recommended Torque
Recommended Torque
Frame
L180 11.2 (0.44) 3/8-16 45-50 (33-37) 64-72 (47-53)
L210 11.2 (0.44) 3/8-16 45-50 (33-37) 64-72 (47-53)
L250 14.2 (0.56) 1/2-13 113-126 (83-93) 159-179 (117-132)
L280 14.2 (0.56) 1/2-13 113-126 (83-93) 159-179 (117-132)
L320 17.5 (0.69) 5/8-11 210-239 (155-176) 271-338 (200-249)
L360 20.6 (0.81) 3/4-10 372-420 (274-310) 527-597 (389-440)
L400 26.9 (1.06) 7/8-9 588-659 (434-486) 835-934 (616-689)
Hole Diameter
mm (in.)
Belted Drive
Motor slide bases or rails, when used, must be securely anchored to
the foundation with the proper bolts.
Bolt Size and
Thread
SAE 5
N-m (lb.-ft.)
SAE 8
N-m (lb.-ft.)
Important: The motor shaft and load shaft must be parallel and the
sheaves aligned. Refer to
“Motor Application Data” on
page 11.
6 AC Induction Motors
Coupled Drive
Motors will operate successfully mounted on the floor, wall or
ceiling, and with the shaft at any angle from horizontal to vertical.
Special mountings, duty or thrust demands may, however, require a
different bearing system.
ATTENTION: Motor C-face is intended for mounting
!
auxiliary equipment such as pumps and gears. When
mounted horizontally, C-face motors should be supported
by the feet and not by the C-face. Installations requiring
horizontally mounted motor frames L280C and L440 must
be supported by the feet as well as C-face or D-flange.
Failure to observe these precautions can result in damaged
equipment and/or personal injury.
Stub Shaft Installation Procedure
Screw-in Stub Shaft
1. Turn off and lockout power to the motor.
2. Remove in-line blower motor and cover assembly by removing
the hex head cap screws on the cover (if enclosure is TEAOBlower cooled).
Important: An extended blower cover is required whena feedback
device is installed. Contact Allen-Bradley for
assistance with an in-line blower.
3. Check the motor shaft center hole for chips, dirt, or other residue
and clean as required.
4. Obtain the stub shaft to be screwed into the motor shaft.
®
5. Apply an even coat of Loctite
stub shaft thread. Place stub shaft in motor shaft threaded hole
and hand tighten.
6. Using a spanner wrench on the motor shaft drive end (or alternate
means of locking motor shaft), torque the stub shaft to 27 N-m
(20 lb.-ft.).
7. Using a dial indicator with 0.0005 inch graduations, indicate the
stub shaft to within 0.002 inch T.I.R. When Inland tachometers
are used, the tachometer stub shafts must indicate to within 0.001
in. T.I.R.
Number 271 (or equivalent) to the
8. Mount feedback device per manufacturer's instructions.
AC Induction Motors 7
Connections
ATTENTION: The user isresponsible forconforming with
!
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Bypass Mode
If the motor is to be used in bypass mode, the user must select a motor
starter and overcurrent 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. Contact
Allen-Bradley to determine suitability of motor for specific
applications in bypass mode.
the National Electrical Code and all other applicable local
codes. Wiring practices, grounding, disconnects and
overcurrent protection are of particular importance. Failure
to observe these precautions could result in severe bodily
injury or loss of life.
ATTENTION: This equipment is at line voltage when AC
power is connected. Disconnect andlockout all ungrounded
conductors of the power line. Failure to observe these
precautions could result in personal injury and/or loss of
life.
Power Wiring
Single Voltage Motors – On Single voltage, three lead motors,
connect leads marked U/T1, V/T2, W/T3, to the appropriate drive
output terminals. Refer to the Drive User Manual for further
information.
Dual Voltage Motors – Be sure the motor leads are connected
properly for the desired “Low” or “High” voltage connection per the
motor connection diagram (see below). Refer to the Drive User
Manual for proper drive output connections.
3 PHASE-DUAL VOLTAGE
LOW VOLTAGE
P1
P2
U/T1
T7
V/T2
T8
W/T3
T9
T4
T5
T6
THERMOSTAT
LEADS
3 PHASE-SINGLE VOLTAGE
P1
P2
U/T1
V/T2
W/T3
P1
P2
U/T1
L1
V/T2
W/T3
L2
T4
T7
L3
T5
T8
T6
T9
THERMOSTAT
LEADS
HIGH VOLTAGE
THERMOSTAT
LEADS
L1
L2
L3
L1
L2
L3
8 AC Induction Motors
Direction of Rotation
These motors are capable of bi-directional shaft rotation. When
voltages in an A-B-C phase sequence are applied to leads U/T1, V/
T2, W/T3, clockwise shaft rotation facing the opposite drive end will
result. If shaft rotation is incorrect, change the direction of rotation as
follows:
ATTENTION: The drive may apply hazardous voltages to
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1. Turn off and lockout all power to the motor. Verify that the
2. Reverse any two of the three motor power leads.
the motor leads after drive power has been removed. Verify
that the drive is incapable of delivering hazardous voltages
and that the voltage at the motor leads is zero before
proceeding. Failure to observe this precaution could result
in personal injury and/or death.
voltage at the motor leads is zero.
Thermostat Leads (Thermal Protector)
As a standard feature, these motors have three (3) normally closed
thermostats (one per phase) connected in series with leads P1 & P2
and terminated in the main conduit box.
To protect against motor overheating, thermostats must be connected
to the appropriate drive circuit (function loss). Failure to connect the
thermostats will void the motor warranty. Follow the Drive User
Manual for correct thermostat lead connections.
Blower Motor
Motors which are blower cooled incorporate an independently
powered three-phase AC blower motor to assure continuous cooling
air flow regardless of motor speed.
ATTENTION: The blower motor is typically wired to the
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AC input of the drive and will be energized even when the
drive is not running. Remove and lockout the main power
supply before touching blower components. Failure to
observe this precaution could result in personal injury and/
or death.
Blower motor fuse protection kits are required for blower motor
overload protection.
The specific blower motor will vary depending on frame size and
enclosure. Follow the connection diagram supplied with the blower
motor, which in general will be one of the following:
AC Induction Motors 9
(Delta) (Star)
T6 T4 T5
T1 T2 T3
L1 L2 L3
Low Volts Line High Volts
T6 T4 T5
T1 T2 T3
L1 L2 L3
or
(Delta) (Star)
W2
U2 V2
U1 V1 W1
L1 L2 L3
Low Volts Line High Volts
U1 = Black
U2 = Green
W2 U2 V2
U1 V1 W1
L1 L2 L3
V1 = Blue
V2 = White
or Connection Diagram shown on page 7.
Procedure:
1. Connect for low or high voltage as shown.
2. Check that the direction of air flow is in agreement with the
“direction of air flow” arrows mounted on the motor. If
directional flow is incorrect, interchange power leads to T1 & T2
or U1 & V1.
Grounding
W1 = Brown
W2 = Yellow
ATTENTION: Connect an appropriate equipment
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grounding conductor to the drive ground terminal, motor
frame, transformer enclosure (if used), drive electrical
enclosure and an appropriate grounding electrode. Failure
to observe these precautions could result in personal injury
and/or death.
The user is responsible for assuring that the grounding method is in
accordance with the National Electric Code and the applicable local
codes. The ground connection should be a solid and permanent
metallic connection between the ground point, the motor terminal
housing and the motor frame. A ground lead is provided inside the
terminal box.
Due to the need to carry higher frequency ground currents (from
switch voltage waveforms) the ground connection/path must be low
impedance/low resistance. Such ground currents exist during normal
operation on inverter power.
Drive
L180-L320 frame motors are supplied with a shaft suitable for a belt
or coupled drive.
Belt loads should be checked against maximum allowable radial loads
“Shaft Loads - Axial and Radial” on page 13. Contact Allen-
under
Bradley to determine L440 frame belt load requirements.
Frames L360S and L400S are suitable for coupled duty only, larger
shafts are supplied for belted duty.
10 AC Induction Motors
ATTENTION: Incorrect motor rotation may cause
!
personal injury or damage the equipment. Check direction
of motor rotation before coupling motor to load.
ATTENTION: Ensure that allguards are properlyinstalled
!
before proceeding. Exercise extreme care to avoid
contacting rotating parts. Failure to observe these
precautions could result in personal injury.
Proper alignment is a key step for long life of bearings, shafts and
belts, and minimum downtime. Misalignment can cause excessive
vibration and damaging forces on shaft and bearings. For direct
coupled drives, flexible couplings facilitate alignment. For belt drives,
the sheave must be placed as close as possible to the motor bracket.
Shipping Blocks
Motors supplied with roller bearings at the drive end are shipped with
wooden blocking to prevent axial movement of the shaft during
shipment. Remove the blocking and bolts securing it and discard.
Make sure motor shafts turn freely. If motor is to be reshipped,
blocking of bearing is required.
Encoder Connection Diagrams
Dynapar H20 – 10 pin M/S Connector
360
°
° ±45°
90
Output A
Output B
Index
Output waveform
CCW Rotation of Shaft
Electrical
360° ±180
°
Lakeshore – Epic Connector or Plain Cable
The following table is a universal wiring guide for the latching Epic
connector or plain cable. Wires that are not used should be left not
connected (never connect to power or common). For optimum EMI
noise immunity, connect the encoder shield (pin 10 or braid) to the
cable shield. The encoder shield is internally isolated from the
encoder frame. The cable shield should still be connected to ground at
the receiving end. This encoder has a line driver output. A pull-up
resistor is not required.
Output Terminations
Signal Pin
Output A A
Output B B
Output Z C
Vcc D
Common F
Case G
No Connection E
Output A (NOT) H
Output B (NOT) I
Output Z (NOT) J
Epic Connector or Plain Cable Connections
Pin Signal Color Pin Signal Color
1 Common Black 6 5-15V Red
2 B Green 7 B (NOT) Yellow
3 A Blue 8 A (NOT) Gray
4 Z Violet 9 Z (NOT) Orange
5 No Connection – 10 Shield Braid
Motor Application Data Maximum Safe Speed
ATTENTION: The machinery builder and/or user are
!
The speeds given in Table B are the maximum mechanically safe
operating speeds for frames with standard construction. These speeds
must not be exceeded under any condition. Motor control must hold
the maximum speed under any load condition including no-load
within the maximum safe speed. Drive systems whose design
characteristics inherently prevent the AC motor from exceeding the
motor maximum safe operating speed must prevent the motor from
exceeding the maximum safe speed if a single component failure
should occur.
responsible for assuring that all drive train mechanisms, the
driven machine, and process material are capable of safe
operation at the maximum speed at which the machine will
operate. Failure to observe these precautions could result in
personal injury.
AC Induction Motors 11
Table B
Maximum Safe Speed
Frame Diameter Maximum Safe Speed
L180 7200 RPM
L210 5000 RPM
L250 5000 RPM
L280 5000 RPM
L320 4000 RPM
L360 3750 RPM
L400 3750 RPM
L440 2700 RPM
With special construction maximum safe speed may differ from the
above values. In all cases, the maximum safe speed is indicated on the
motor nameplate.
Important: Normal operating speeds must be limited to those listed in
order to meet nameplate rating and assure validity of
warranty.
12 AC Induction Motors
Minimum V-Belt Sheave Diameters
Application of Pulleys, Sheaves, Sprockets and Gears on Motor Shafts
To avoid excessive bearing loads and shaft stresses, belts should not
be tightened more than necessary to transmit the rated torque. The
pre-tensioning of the V-belt drive should be based on the total
tightening force required to transmit the horsepower divided by the
number of belts. This procedure avoids the excessive load caused by
tightening individual belts to a prescribed level recommended by belt
manufacturers.
Mounting
In general, the closer pulleys, sheaves, sprockets or gears are mounted
to the bearing on the motor shaft, the less will be the load on the
bearing. This will give greater assurance of trouble-free service.
The center point of the belt, or system of V-belts, must not be beyond
the end of the motor shaft.
The inner edge of the sheave or pulley rim should not be closer to the
bearing than the shoulder on the shaft but should be as close to this
point as possible.
The outer edge of a chain sprocket or gear must not extend beyond
the end of the standard motor shaft.
Shaft Extension and Method of Drive
Frames L180-L250 are supplied with a shaft and bearing system
suitable for either coupled or belted drives. Belt loads should be
checked against maximum allowable radial loads under
- Axial and Radial” on page 13. Frames L280-L320 may be supplied
with roller bearings for belt duty applications. Frames L360-L440 are
supplied with larger shafts and roller bearings when belted drives are
specified.
Preferred V-Belt Drives
(Sheave Centerline is Toward Motor from End of Shaft)
where:
V
d = Minimum pitch diameter of V-belt sheave in inches or
x
d
millimeters.
hp = Rated horsepower at base speed.
kw = Rated kilowatts at base speed.
x = Axial distance of the sheave centerline from the end of
the shaft in inches or millimeters. The distance is
measured from the end of the shaft (x is negative if
centerline is beyond the end of the shaft and positive if
toward the motor.) The formula should not be used for
negative values of x greater than one half of the V
dimension of the shaft extension.
“Shaft Loads
AC Induction Motors 13
Table C
Constants for Calculating the Minimum Sheave Diameters for V-Belt Drives
Frame Units
L210 inches 3.50 A 40.6 30.0 19.77 14.63
millimeters 88.9 C 1384 1022 674 499
L250 inches 4.00 A 23.33 18.25 12.67 9.47
millimeters 101.6 C 795 622 432 323
L280 inches 4.50 A 20.28 16.17 11.2 8.32
millimeters 114.3 C 691 551 382 284
L320 inches 5.00 A 18.47 14.25 9.97 –
millimeters 127.0 C 630 486 340 –
UL360 inches 6.25 A 10.42 8.08 5.89 –
millimeters 158.8 C 355 275 201 –
UL400 inches 8.00 A 8.9 6.9 4.8 –
millimeters 203.2 C 303 235 163 –
“V”
Dimension Constant
B 7.26 5.43 3.56 2.09
D 9.73 7.28 4.77 2.80
B 3.58 2.3 1.17 0.57
D 4.80 3.08 1.57 0.76
B 2.94 1.75 0.84 0.43
D 3.94 2.35 1.13 0.58
B 2.00 1.24 0.59 –
D 2.68 1.66 0.79 –
B 0.46 0.25 0.13 –
D 0.62 0.34 0.17 –
B 0.30 0.23 0.16 –
D 0.40 0.31 0.21 –
Base RPM
850 1150 1750 2500
Shaft Loads - Axial and Radial
These motors are suitable for limited shaft loads as shown in Tables D
and
E. Recommended maximum thrust loads depend on the mounting
position, either horizontal or vertical. For recommendations for loads
in excess of those shown, contact Allen-Bradley.
Table D
Axial Thrust Capacity - No Radial Load
Horizontal Mounting Vertical Mounting
Frame Units
L180 pounds 430 500 600 675 430 ±60 500 ±60 600 ±60 675 ±62
kilograms 195 227 272 306 198 ±27 227 ±27 272 ±27 306 ±27
L210 pounds 477 551 662 742 498 ±61 564 ±61 676 ±61 756 ±61
kilograms 217 251 301 338 227 ±28 257 ±28 308 ±28 344 ±28
L250 pounds 509 600 722 828 541 ±86 629 ±86 755 ±86 865 ±86
kilograms 231 272 327 376 245 ±39 285 ±39 342 ±39 392 ±39
L280 pounds 590 700 850 975 644 ±122 754 ±122 905 ±122 1038 ±122
kilograms 268 318 386 442 292 ±56 342 ±56 411 ±56 471 ±56
L320 pounds 705 835 1020 1170 770 ±175 905 ±175 1095 ±175 1250 ±175
kilograms 320 379 463 531 349 ±80 411 ±80 497 ±80 567 ±80
L360 pounds 875 1075 1350 1525 830 ±293 1020 ±293 1300 ±293 1475 ±293
kilograms 397 488 612 692 376 ±133 463 ±133 590 ±133 669 ±133
L400 pounds 1350 1630 2000 2250 1470 ±352 1820 ±352 2210 ±352 2475 ±352
kilograms 612 740 908 1021 667 ±160 826 ±160 1003 ±160 1123 ±160
L440 pounds 1300 1550 1800 2050 1365 ±1085 1600 ±1085 1865 ±1085 2080 ±1085
1
Thrust capacity for vertical mounting includes a constant whose value is plus or minus depending on the direction of the thrust load. The constant is plus for thrust loads
acting upward against the force of gravity and minus for loads acting downward with gravity.
kilograms 590 703 816 930 619 ±492 726 ±492 846 ±492 943 ±492
2500 RPM 1750 RPM 1150 RPM 850 RPM 2500 RPM 1750 RPM 1150 RPM 850 RPM
14 AC Induction Motors
ATTENTION: The use of these radial load capacities
!
requires the accurate calculation of the radial load for the
application. Radial loads for gears, sprockets, and flywheel
are usually accurately determined but the radial loads due
to V-belt drives are subject to miscalculations because they
do not include all of the pre-tension load (belt tightening).
The calculations of the radial load for a V-belt drive must
include the pre-tension for transmitting the horsepower,
pre-tension for centrifugal force on the belts, pre-tension
for high start torques, rapid acceleration or deceleration,
pre-tension for driveswith short arc-of-contact between the
V-belt and sheave, and low coefficient of friction between
belt and sheave caused by moisture, oil or dust. Failure to
observe these precautions could result in damage to or
destruction of the equipment.
Table E
Radial Load Capacity - No Axial Load
Radial Load Capacities at the End of the Shaft in kg (lbs.)
Frame
L180 202 (445) 202 (445) 202 (445) 202 (445)
L210 397 (875) 397 (875) 397 (875) 397 (875)
L250 623 (1375) 692 (1525) 692 (1525) 692 (1525)
L280 703 (1550) 796 (1755) 796 (1755) 796 (1755)
L320 764 (1685) 816 (1800) 816 (1800) 816 (1800)
UL360
UL400
1
Data for motors with roller bearings at the drive end (back end). Motors with ball bearings at the drive
end are for coupled duty only.
2
Contact Allen-Bradley to determine L440 frame belt load requirements.
2500 RPM 1750 RPM 1150 RPM 850 RPM
1
1157 (2550) 1304 (2875) 1497 (3300) 1501 (3310)
1
1644 (3625) 1855 (4090) 2132 (4700) 2354 (5190)
2
Operation Motor Start-Up
ATTENTION: Before initial start-up observe the
!
following precautions.
• Remove all unused shaft keys and loose rotating parts
• When the motor is supplied as part of drive system,
Failure to observe these precautions could result in
personal injury or death.
to prevent them from flying off. Replace covers and
protective devices.
refer to the Drive User Manual for operating
instructions. Tachometer feedback must be properly
connected for closed loop operation. Reverse
polarities or broken connections can cause dangerous
overspeeds.
AC Induction Motors 15
In addition to observing the above precaution, all precautions
(Attentions) mentioned previously in this document should be
observed.
• Stop and remove power from the motor per the Drive User
Manual directions.
• Verify that the DC bus voltage is zero per the Drive User Manual.
• The interior of the motor should be clean and dry.
• Connections must be tight.
• The driven machine should be unloaded, if possible.
Important: Machines designed for cooling by a separate source of
forced ventilation must not be operated without the air
supply. Be sure blower is running in proper direction.
While operating the motor, observe the performance. It should run
smoothly with little noise. The bearings should not overheat and
should reach a leveling off temperature. Any undue noise,
overheating, or erratic performance should be investigated and
necessary corrective action taken immediately to prevent serious
damage. Before attempting any repairs, please contact your AllenBradley Sales Office.
All motors are lubricated before shipment and will operate for a long
period before regreasing is required. The period will vary depending
on environmental and service conditions. Refer to
“Maintenance” on
page 16.
ATTENTION: Surface temperature of the motorenclosure
!
may reach temperatures which can cause discomfort or
injury to personnel coming into contact with hot surfaces.
The user must apply appropriate guards and/or shields to
protect against accidental contact with motor surface.
Failure to observe this precaution may result in personal
injury.
Balance
Motors are dynamically balanced to commercial limits unless ordered
differently. Balance is done with a full length 1/2 height shaft key. A
full shaft key is shipped with the motor. Sheave or coupling should be
balanced with a 1/2 height shaft key.
Standard Dynamic Balance Limits
Highest Rated Speed
(RPM)
3,000 - 4,000 0.0010
1,500 - 2,999 0.0015
1,000 - 1,499 0.0020
Up to 999 0.0025
Maximum Amplitude
(Inches)
16 AC Induction Motors
Maintenance
ATTENTION: Internal parts of this motor may be at line
!
potential even when it is not rotating. Before performing
any maintenance which could result in contacting any
internal part, besure to disconnectall power from the motor.
Failure to observe this precaution could result in severe
personal injury or death.
Amount of grease to be added to motors is shown in Table F. See
Table H for relubrication interval. Use Chevron SRI-2 or equivalent
grease unless motor nameplate specifies special grease.
Table F
Coupled/Belted or Tandem Duty Grease Amounts
Volume Weight
Frame
L180 - L280 1.0 16 0.5 14
L320 - L400 2.0 32 1.0 28
L440 3.0 48 1.5 42
Cubic Inches Cubic Centimeters Ounces Grams
Using the table below, determine service condition on the basis of the
most severe operating parameter (i.e. temperature, bearing load,
atmosphere, or operating hours per day).
Table G
Service Condition
Service
Condition Ambient Temperature Bearing Load Atmosphere
Standard –18 to 40 degrees C
Severe –30 to 50 degrees C
Extreme
1
Motors must be specially designed for operation in ambient outside the range of –25 to 40 degrees C
(–13 to 104 degrees F). Special grease is required.
2
"EXTREME" service conditions are rare in actual practice. Corresponding lubrication cycles should
therefore beapplied with caution.In addition, itis advisable tocheck with Allen-Bradleyfor related special
instructions.
(0 to 104 degrees F)
(–22 to 122 degrees F)
2
–54 to 65 degrees C
(–65 to 149 degrees F)
Steady Clean 8
Medium Shock, Vibration
1
(less than 0.2 in/sec.)
Heavy Shock, Vibration
1
(more than 0.44 in/sec)
Medium Dirt,
Abrasives,
Corrosion
Heavy Dirt,
Abrasives,
Corrosion
Operating
Hours/Day
8 to 24
8 to 24
AC Induction Motors 17
Table H
Relubrication Periods - Frames L180 - L440
Relubrication Interval (Months)
Maximum Normal
Operating Speed (RPM)
3450 and higher All 9 4 1
2400 - 3449 L180 - L250 24 9 3
1700 - 2399 L180 - L320 36 12 3
800 - 1699 L180 - L320 36 24 8
500 - 799 L180 - L320 48 36 12
499 and lower L180 - L440 48 36 12
1
Maximum speed occupying more than 30% of operating time.
2
For Tandem drives increase frequency of lubrication by multiplying values by 0.8.
1
Frame
L280 - L440 9 3 1
L360 - L440 18 6 2
UL360 - UL440 9 3 1
L360 - L440 36 12 3
UL360 - UL440 9 6 1
L360 - L440 36 24 8
UL360 - UL440 18 12 4
UL360 - UL440 24 18 6
Standard
Service
Severe
Service
Extreme
Service
Lubrication - Frames L180 - L440
These motors are designed to route new grease directly into the
bearing. The relubrication periods shown in
guide for varying service conditions, speeds, bearing types and
operating hours.
Important: Certain special motors may have a lubrication instruction
plate permanently attached. These specific lubricating
instruction must be followed.
Lubrication Procedure
ATTENTION: If relubrication is done while motor is
!
running, stay clear of rotating parts. Failure to observe this
precaution could result in personal injury.
1. Relubrication with the shaft stationary and a warm motor is
recommended. If lubrication must be done with the motor
running, stay clear of rotating parts and electrical circuits.
2. Locate the grease inlet at the top of the bearing hub, clean the
area and replace the 1/8 inch pipe plug with a grease fitting (if the
motor is not equipped with a grease fitting).
Table H are offered as a
3. Remove grease drain plug located opposite the grease inlet.
4. Using a manual grease gun, pump in the recommended grease in
the amount shown in
Table F. This amount of grease will provide
an ample supply of lubricant between lubrication periods as
determined from
Table H for the service condition listed in Table
G.
18 AC Induction Motors
Use Chevron SRI-2 grease or equivalent unless motor nameplate
specifies special grease. Use only clean, fresh grease from clean
containers and handle carefully to keep it clean.
In general, mixing of greases is not recommended. If an
incompatible grease is used, the lube system must be repacked
completely with the new grease.
5. Wipe away any excess grease at the grease drain or relief and
replace drain plugs.
Repacking Bearings or Greasing New Bearings
When existing bearings have been completely cleaned of old grease
or when bearings are replaced, use this procedure for packing the
bearing.
1. Apply one bead of grease around the inboard side of the bearing,
between bearing and inner cap. Assure that grease adheres to
balls or rollers.
2. Apply one bead of grease around outboard side of bearing,
making sure grease adheres to balls or rollers.
3. Completely fill grease inlet and outlet passage holes with grease.
4. Fill outboard bearing cavity 60% to 90% full of grease.
5. If possible, rotate shaft of assembled machine at least three
revolutions by hand to distribute grease within bearings before
starting motor.
Bearings
Bearing housing designs provide protection to windings and interior
of machine by minimum grease leakage. They also provide good
protection against external contamination.
Various types of anti-friction bearings are used in the wide range of
frames as needed to meet specific load, speed and service
requirements.
Most commonly used bearings are:
• Single row, open ball bearings for coupled and belted duty for
frames L180 - L320.
• Single row, open ball bearings for coupled duty for frames L360
and L400.
• Cylindrical roller bearings at drive end for belted duty on frames
UL360 and UL400.
AC Induction Motors 19
Frequent bearing checks are recommended. If temperatures become
excessive, investigate immediately for the cause. Total bearing
temperatures should not exceed 121 degrees C (250 degrees F).
Causes for high bearing temperature are:
• Contaminated grease.
• Insufficient grease or excessive amount.
• Incorrect grease.
• Excessive load or thrust due to misalignment or motor overload.
• Loose bearings.
• Bearing failure.
• Excessive ambient temperature.
Replacement bearings should be ordered from Rockwell Automation
in order to obtain the same carefully selected bearing as the original.
Bearings should never be exposed by disassembly of the motor unless
absolutely necessary for inspection or replacement of the bearing or
maintenance in other parts of the machine. Protect good bearings
from dirt and contamination at all times. Most bearing failures are
caused by dirt.
Disassembly and Reassembly Instructions
The open ball bearings for motor frames L180 - L320 are the same
regardless of whether application is coupled or belted. Belted duty for
frames UL360 and UL440 requires the use of roller bearings.
Coupled duty uses ball bearings.
Axial Float
Motors have a wave spring washer between the drive end bracket and
bearing. The opposite drive end bearing is positioned axially by a
float restricting inner cap. Axial float (including bearing internal
clearance) should be within the limits listed below. The L440 frame
spring is located on the opposite drive end.
Axial Float
Frame Maximum Minimum
L180 - L440 1.29 mm (0.051 in.) 0.33 mm (0.013 in.)
Anti-Friction Bearing Assemblies
The bearings are positioned and secured in a machined cavity in the
end brackets. Open type ball bearings are used for direct coupled and
belt drive applications for frames L180 - L320 (employ ball bearings
at both ends) and are protected by inner caps at both ends.
Frames UL360, UL400 and UL440 employ a cylindrical roller
bearing on the drive end for belt drives, and a ball bearing for coupled
service.
20 AC Induction Motors
Bearing Replacement
Remove bearing by means of bearing puller. Clean bearing housing
and bearing seat prior to assembly of bearing. Place new bearing in a
bake oven for 1/2 hour at 121 degrees C (250 degrees F). Place
bearing onto shaft and push home to bearing shoulder. Hold it in
place for a minimum of 30 seconds.
After bearing has cooled down for about 1 minute, add 1/2 cu. in. of
fresh grease into back of bearing. Once motor is assembled, grease
bearings per instructions found herein.
Bracket Re-Assembly
To obtain proper planity between the integral mounting feet on the
front and back end brackets of L210-L440 frame motors, a smooth
level surface should be used to align the brackets when they are
assembled to the frame. Check for proper shaft alignment after
reinstalling the motor.
Stub Shaft Removal Procedure Drive-in Stub Shaft
1. Turn off and lockout power to the motor.
2. Remove in-line blower motor and cover assembly by removing
the hex head cap screws on cover (if enclosure is TEAO-Blower
cooled).
3. After removal of blower assembly, obtain the stub shaft puller
backplate and assemble over the stub shaft against the end of the
motor shaft.
4. Obtain the stub shaft puller plate (available from Rockwell
Automation) and assemble over the stub shaft, and up against the
puller backplate.
Important: Note 7/16 inch set screws must be backed out enough
to clear the stub shaft O.D. 1/2inch jack screws should
be backed out to allow puller plate to fit up flush against
the backplate.
5. Screw the 7/16 inch set screws in on each side of the puller plate
until they contact the stub shaft. Keep the stub shaft reasonably
centered between the jack screws. Tighten screws securely.
6. Using a 3/8 inch allen wrench, turn the jack screws, in equal
amounts, in a clockwise manner to remove the stub shaft. If the
set screws slip, retighten and repeat process.
7. Replace blower motor and cover assembly (if TEAO - blower
cooled) with the correct extended blower cover, using the hex
head cap screws previously removed.
AC Induction Motors 21
Screw-in Stub Shaft
1. Turn off and lockout power to the motor.
2. Remove in-line blower motor and cover assembly by removing
the hex head cap screws on cover (if enclosure is TEAO-Blower
cooled).
3. After removal of blower assembly, motor shaft will need to be
locked from turning. The use of a spanner wrench on motor drive
shaft or alternate means can be used. Place an open-end wrench
on stub shaft flats and turn counter clockwise (right-hand
threads).
4. Replace blower motor and cover assembly (if TEAO - blower
cooled) with the correct extended blower cover, using the hex
head cap screws previously removed.
Replacement Bearings/Spare Parts
Your maintenance program will not be complete without including
spare bearings. It must be remembered that the bearing is a wearable
component and therefore must eventually be replaced. To ensure that
you are able to maintain original operation, we recommend the
purchase of spare parts directly from Rockwell Automation.
All bearings are subject to exact specifications and tests necessary to
satisfy performance requirements. In this manner, it is possible to
duplicate your present bearing. Markings on the bearing do not
indicate complete specifications.
A detailed parts list, which gives Allen-Bradley recommendations for
spare parts that should be stocked for your equipment, can be ordered
from your Allen-Bradley Sales Office. Be sure to include complete
nameplate data - serial number, model number, rating, etc. - for your
equipment when ordering the spare parts list.
22 AC Induction Motors
Parts Identification Drawing Totally Enclosed Blower Cooled
Item No. Part Description Item No. Part Description
1 Frame/stator 13 Grill, Blower
2 Rotor 14 Eyebolt
3 Bracket, B.E. 15 Conduit Box, Main Motor
4 Bracket, F.E. 16 Grease Fitting, B.E.
5 Shaft 17 Grease Fitting, F.E.
6 Ball Bearing, B.E. 18 Key, Shaft Extension
7 Inner Cap, B.E. 19 Feedback Device (When Supplied)
8 Ball Bearing, F.E. 20 Connector, Feedback Device
9 Inner Cap, F.E. 21 Coupling, Feedback Device
10 Wave Washer, B.E. 22 Mounting Adapter, Feedback Device
11 Blower Motor 23 Blower Motor Conduit Box
12 Cover, Blower
Total Service Programs Allen-Bradley can provide a wide range of maintenance programs to
help you reduce downtime, improve productivity and increase profits.
Capabilities include:
• Motor Start-up Service
• Motor Electrical and Mechanical Preventive Maintenance
• Vibration Analysis
• Mobile Van Repair Service
• Balancing and Alignment Service
• Maintenance Service
• 24-Hour Technical Support
• Modernization Service
For more information contact your local Allen-Bradley Sales Office.
Notes
AC Induction Motors 23
Online Documentation
The latest motor information can be obtained from the Allen-Bradley
Drives & Motors home page on the World Wide Web at:
http://www.controlmatched.com
Publication 1329L-UM001A-EN-P – July, 2001
Supersedes 1329L-5.0 dated March, 2000 Copyright © 2001 Rockwell Automation. All rights reserved. Printed in USA.
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