Reliance electric RPM AC Installation and operating instructions

Installation, Operation
and Maintenance of
RPM AC¥
INDUCTION MOTORS
• FRAMES 56-L440
• SPECIFICALLY DESIGNED FOR OPERATION
WITH ADJUSTABLE FREQUENCY
CONTROLLERS
Instruction Manual B-3682-3

Table of Contents
GENERAL DESCRIPTION
Receiving and Handling.............................................................................................................................................1
INSTALLATION
Location.....................................................................................................................................................................2
Drain Plugs................................................................................................................................................................2
Mounting....................................................................................................................................................................2
Stub Shaft..................................................................................................................................................................3
Connections...............................................................................................................................................................3
Direction of Rotation..................................................................................................................................................4
Grounding..................................................................................................................................................................5
Drive ..........................................................................................................................................................................5
Shipping Blocks.........................................................................................................................................................5
Encoder Connections - Dynapar H2O and Lakeshore Products...............................................................................5
MOTOR APPLICATION DATA
Maximum Safe Speed ...............................................................................................................................................6
Minimum V-Belt Sheave Diameter.............................................................................................................................6
Shaft Extension and Method of Drive........................................................................................................................6
Shaft Loads - Axial and Radial ..................................................................................................................................6
OPERATION
Motor Start-Up...........................................................................................................................................................8
Balance......................................................................................................................................................................8
MAINTENANCE...............................................................................................................................................................9
Lubrication...............................................................................................................................................................10
Bearings .................................................................................................................................................................11
Disassembly and Reassembly.................................................................................................................................12
Stub Shaft Removal.................................................................................................................................................12
Replacement Bearings/Spare Parts ........................................................................................................................13
PARTS IDENDIFICATION.............................................................................................................................................14
TOTAL SERVICE CAPABILITY.....................................................................................................................................15
REGIONAL SERVICE CENTERS .................................................................................................................................16

1
General Description
The products described in this instruction manual are manufactured by Reliance Electric Industrial Company.
RPM AC™ motors are high performance motors specifically designed for use with adjustable frequency controllers.
The basic design includes Class H insulation (Class F for 56, 140T and W180T frames), 1.0 service factor, 40
R
C
ambient, con tinuous duty. Standard enclosures are totally enclosed blower cooled, totally enclosed fan-cooled, non-
ventilated and drip-proof force ventilated. Many modifications, and accessories are available.
NOTE: RPM AC motors are
equipped with metric hardware.
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, be sure the
freight or express agent makes an
appropriate notation on your freight
bill or express receipt. If any
concealed loss or dam age is
discovered, notify your freight or
express agent at once and request
him to make an inspection.
Reliance Electric will assist you in
collecting claims for loss or damage
in shipment. However, this does not
re move 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 Reliance Electric invoice, nor
should payment of the Reliance
Electric invoice be withheld awaiting
adjustment of such claims, as the
carrier guarantees safe delivery.
If considerable damage has been in
incurred and the situation is urgent,
con tact the nearest Reliance
Electric District Office for assistance.
Please keep a writ ten record of all
such communications.
Handling
In all cases, care should be taken to
assure lifting in the direction
intended in the design of the lifting
means. If multiple eyebolts are
provided, lift using diagonally
opposite eyebolts. 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
R
from horizontal.
For unusual conditions, such as
side-wall and ceiling mounting of
horizontal motors and installation of
vertical motors shipped in a
horizontal position, special
precautions must be taken and it is
recommended that an experienced
rigger be employed.
Storage
Motors must be stored in a clean,
dry area protected from extremes of
temperature, moisture, shock and
vibration. Storage temperatures of
50
R
F to 120
R
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 of Reliance Electric
Service Bulletin A-8018 available
from your Reliance Electric District
Sales Office.
All drains to be full
y
operable
while in stora
g
e, and/or the drain
plu
g
s removed. The motors must
be stored so that the drain is at
the low est point. All breathers
and automatic “T” drains must be
operable to allow breathin
g
at
points other than throu
g
h the
bearin
g
fits.
DANGER
ONLY QUALIFIED ELECTRI-
CAL PERSONNEL FAMILIAR
WITH THE CONSTRUCTION
AND OPERATION OF THIS
EQUIPMENT AND THE HAZ-
ARDS INVOLVED SHOULD
INSTALL, ADJUST, OPERATE,
AND/OR SERVICE THIS
EQUIPMENT. READ AND
UNDERSTAND THIS MANUAL
IN ITS ENTIRETY BEFORE
PROCEEDING. FAILURE TO
OBSERVE THIS PRECAUTION
COULD RESULT IN SEVERE
BODILY INJURY OR LOSS OF
LIFE.
WARNING
EYEBOLT(S) OR LIFTING
LUG(S) ARE INTENDED FOR
LIFTING THE MOTOR ONLY
WITH THE STANDARD ACCES-
SORIES SUCH AS TACHOME-
TER, BRAKES, ETC.,
MOUNTED BY RELIANCE
ELECTRIC. THE LIFTING
MEANSONTHEMOTORMUST
NOT BE USED TO LIFT THE
UNIT PLUS ADDITIONAL
EQUIPMENT FAILURE TO
OBSERVE THIS PRECAUTION
COULD RESULT IN BODILY
INJURY.
WARNING
EYEBOLTS MAY UNSCREW
DURING LIFTING. CHECK EYE-
BOLTS TO INSURE THAT THEY
ARE TIGHT AND SECURE
EYEBOLTS FROM TURNING,
OR LIFT THE UNIT ON A SLING
OR PLATFORM. FAILURE TO
OBSERVE THIS PRECAUTION
COULD RESULT IN BODILY
INJURY.

2
Installation
RELIANCE® AC MOTORS ARE DE
SIGNED AND BUILT IN AC
CORDANCE WITH
SAFETY STAN
DARD FOR CONSTRUCTION AND
GUIDE FOR SELECTION,
INSTALLATION AND USE OF
ELECTRIC MO\TORS AND
GENERATORS
PUBLISHED BY
THE NATIONAL ELECTRICAL
MANUFACTURERS ASSOCIATION
(NEMA) PUBLICATION MG-2-1983
(ANSI C51.5). RELIANCE
ELECTRIC RECOMMENDS THAT
THIS PUBLICATION BE
REFERRED TO WHENEVER YOU
SELECT OR INSTALL ANY AC
MOTOR. COPIES MAY BE
OBTAINED FROM NEMA, 2101 L.
STREET, WASHINGTON, D.C.,
20037.
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 lo
cal code inspection and enforcement
agencies to insure compliance.
Location
Locate the machine where the
ambient temperature is not over
40
R
C or 104
R
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.
NOTE: The cooling system on
standard RPM AC totally enclosed,
blower cooled motors requires clean
air to be forced through ducts which
are integral to the frame. It is
important that these air passages be
kept clean and that sufficient
clearance be provided on the blower
motor air inlets and 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 6
inches of clearance between the
opening and adjacent walls or floor.
NOTE: Motors located in a damp,
moist environment must have space
heaters to protect against
condensation when motor is not
operating.
Drain Plugs
If motor is totall
y
enclosed it is
recommended that condensation
drain plu
g
s be removed. These
are located in the lower portion of
the end-shields or bottom of
frame on each end for L180 frame.
Totall
y
enclosed “XT” motors are
equipped with automatic drains
which should be left in place as
received.
Power Supply
The RPM AC motor is an adjustable
speed motor designed for operation
with adjustable frequency
controllers.
Verify that the motor nameplate data
corresponds to the controller output
rating and follow the Controller
Instruction 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 drip-proof
force ventilated, F1 is standard.
Conduit box can be rotated in 90
degree increments for lead outlet at
front, back or sides. On L180 motors
the conduit box is integral to the top
of the frame with F1 and F2 outlets.
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 mo tor damage. All hold down
bolts must be the correct grade for
the type of mounting and must be
torqued to their recommended
value.
Belted Drive
Motor slide bases or rails, when
used, must be securely anchored to
the foundation with the proper bolts.
NOTE: The motor shaft and the load
shaft must be parallel and the
sheaves aligned. Refer to Motor
Application Data Section of sheave
and belt data.
DANGER
ONLY QUALIFIED ELECTRI-
CAL PERSONNEL FAMILIAR
WITH THE CONSTRUCTION
AND OPERATION OF THIS
EQUIPMENT AND THE HAZ-
ARDS INVOLVED SHOULD
INSTALL, ADJUST, OPERATE,
EQUIPMENT READ AND
UNDERSTAND THIS MANUAL
AND/OR SERVICE THIS IN ITS
ENTIRETY BEFORE PRO-
CEEDING. FAILURE TO
OBSERVE THIS PRECAUTION
BODILY INJURY OR LOSS OF
LIFE.
Frame
Hole
Dia.
H (Inch)
Bolt
Size
and
Thread
Recommended
Torque
Foot - Pounds
Bolt Grade
SAE 5 SAE 8
L180 .44 3/8-16 33-37 47-53
L210 .44 3/8-16 33-37 47-53
L250 .56 1/2-13 83-93 117-132
L280 .56 1/2-13 83-93 117-132
L320 .69 5/8-11 155-176 200-249
L360 .81 3/4-10 274-310 389-440
L400 1.06 7/8-9 434-486 616-689

3
Coupled Drive
Standard RPM AC 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.
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 cover(if
enclosure is TEAO-Blower
cooled).
NOTE:
An extended blower cover
may be required when a feedback
device is installed. See Reliance
catalog or contact Renewal Parts
forassistancewithanin-lineblow-
er.
3. Check the motor shaft center
hole for chips, dirt, or other
residue and clean as required.
NOTE:
56 and 140T - Some 180
have integral stub shaftwith cover
plate. Remove cover plate and
skip to 8.
4. Obtain the stub shaft to be
screwed into the motor shaft.
ObtainLoctite®Number 271
(Red thread-lock)
5. Apply even coat of Loctite®
Number 271 to stub shaft thread.
Place stub shaft in motor shaft
threaded hole and hand tighten.
6. Using a spanner wrench on
motor shaft drive end (or
alternate means of locking motor
shaft), torque the stub shaft to 20
ft-lbs.
7. Using a dial indicator with .0005
graduations, indicate the stub
shaft to within .002" T.I.R., except
when Inland tachometers are
used. In land tachometer stub
shafts must indicate to within
.001" T.I.R.
8. Mount feedback device per
manufacturer's instructions.
Connections
Bypass Mode
If an RPM AC motor is to be used in
by pass 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. Consult
Reliance Electric to determine
suitability of motor for specific
applications in bypass mode
.
1. RPM AC motor - POWER
LEADS Sin
g
le Volta
g
e/Three
LeadMotors
Connect leads marked U/T1 V/T2
W/T3 to the appropriate controller
outputterminalspertheController
Instruction Manual. See Connec-
tion Diagram 422927-1 below.
Dual Voltage Motors
Be sure the motor leads are
connected properly for the desired
“Low” or “High” voltage connection
per the motor connection diagram on
the motor. Follow the Controller
Instruction Manual for proper
connection to the controller output
terminals. See diagram 422927-1
below.
Connection Diagram 422927-1.
WARNING
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 A
HORIZONTALLY MOUNTED
MOTOR IN FRAMES L280C -
L440 MUST BE SUPPORTED
BY THE FEET AS WELL AS C-
FACE OR D-FLANGE. FAILURE
TO OBSERVE THESE PRE-
CAUTIONS CAN RESULT IN
DAMAGED EQUIPMENT AND
BODILY INJURY. THE USER IS RESPONSIBLE
FOR CONFORMING WITH THE
NATIONAL ELECTRICAL
CODE AND ALL OTHER
APPLICABLE LOCAL CODES.
WIRING PRACTICES,
GROUNDING, DISCONNECTS,
AND OVERCURRENT PRO-
TECTION ARE OF PARTICU-
LAR IMPORTANCE. FAILURE
TO OBSERVE THESE PRE-
CAUTIONS COULD RESULT IN
SEVERE BODILY INJURY OR
LOSS OF LIFE.
THIS EQUIPMENT IS AT LINE
VOLTAGE WHEN AC POWER
IS CONNECTED. DISCONNECT
AND LOCKOUT ALL
UNGROUNDED CONDUC-
TORS OF THE AC POWER
LINE. FAILURE TO OBSERVE
THESE PRECAUTIONS COULD
RESULT IN SEVERE BODILY
INJURY OR LOSS OF LIFE.
3 PHASE-DUAL VOLTAGE
422927-1
THERMOSTAT
LEADS
ASE- SINGLE VOLTAGE3 PH
P2
U/T1
W/T3
V/T2 L1
L2
L3
P1
`
THERMOSTAT
LEADS
HIGH VOLTAGE
P2
U/T1
W/T3
T5
T7
T4
V/T2
T9
L1
L2
L3
P1
`
LOW VOLTAGE
THERMOSTAT
LEADS L1
L2
P2
U/T1
V/T2
T9
W/T3
T8
T7
T4
T5
T6
L3
P1
`

4
For 56, 140T and W180T frame size
connection see diagram 219P036.
Connection Diagram 219P036
II. Direction of Rotation
RPM AC motors are designed to
be capable of bi-directional shaft
rotation.WhenvoltagesinanA-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:
1. Turn off and lockout all power to
the motor.
2. Beforeproceeding, verify that the
voltage at the motor leads is
zero.
3. Reverse any two of three motor
power leads.
III. RPM AC Motor - THERMOSTAT
LEADS (THERMAL
PROTECTOR)
As a standard feature, RPM AC
motors have three (3) normally
closed thermostats (one per
phase) connected in series, with
leadsP1 and P2 terminated in the
main conduit box.
Toprotectagainstmotoroverheat-
ing,thermostatsmustbeconnect-
edtotheappropriatecontrollercir-
cuit (function loss). Failure to
connect the thermostats will
void the motor warranty.Follow
the controller instruction man-
ual for correct thermostat lead
connections.
IV. BLOWER MOTOR
RPMACmotorswhichareblower
cooled incorporate an indepen-
dently powered three-phase AC
blower motor to assure continu-
ous cooling air flow regardless of
RPM AC motor speed.
.
NOTE:
RPM AC blower motor fuse
protection kits are required for
blower motor overload protection.
Blower Motor Connection
The specific RPM AC 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:
1.
2.
NOTE: 56, 140T and W180T frames
have single phase 115V blower
motors. See connection diagram
219P108.
3. Connection Diagram 422927-1
under dual voltage motors above.
THIS EQUIPMENT IS AT LINE
VOLTAGE WHEN AC POWER
IS CONNECTED. DISCONNECT
AND LOCKOUT ALL UN-
GROUNDED CONDUCTORS
OF THE AC POWER LINE.
FAILURE TO OBSERVE THESE
PRECAUTIONS COULD RE-
SULT IN SEVERE BODILY
INJURY OR LOSS OF LIFE.
3 PHASE-DUAL VOLTAGE
219P36
LEADS P1 & P2 ARE THERMOSTAT LEADS.
THEY ARE TO BE CONNECTED IN SERIES WITH
THE HOLDING COIL OF THE MOTOR CONTROLLER,
WHICH USES A MANUAL MOMENTARY START
SWITCH.
TO REVERSE DIRECTION OF ROTATION INTER-
CHANGE ANY TWO LINE LEADS.
THERMOSTAT
LEADS
ASE- SINGLE VOLTAGE3 PH
P2
T1
T3
T2
L1
L2
L3
P1
`
THERMOSTAT
LEADS
HIGH VOLTAGE
P2
T1
T3
T5
T7
T4
T2
T9
L1
L2
L3
P1
`
LOW VOLTAGE
THERMOSTAT
LEADS L1
L2
P2
T1
T2
T9
T3
T8
T7
T4
T5
T6
L3
P1
`
DANGER
THE CONTROLLER MAY AP-
PLY HAZARDOUS VOLTAGES
TO THE MOTOR LEADS AFTER
POWER TO THE CONTROL-
LER HAS BEEN TURNED OFF.
VERIFY THAT THE CONTROL-
LER IS INCAPABLE OF
ELIVERING HAZARDOUS
VOLTAGES AND THAT THE
VOLTAGE AT THE MOTOR
LEADS IS ZERO BEFORE
PROCEEDING. FAILURE TO
OBSERVE THIS PRECAUTION
MAY RESULT IN SEVERE
BODILY INJURY OR DEATH.
DANGER
THE BLOWER MOTOR IS TYPI-
CALLY WIRED TO THE AC
INPUT OF THE CONTROLLER
AND WILL BE ENERGIZED
EVEN WHEN THE CONTROL-
LER IS NOT RUNNING. TURN
OFF AND LOCKOUT OR TAG
MAIN POWER SUPPLY BE-
FORE TOUCHING BLOWER
COMPONENTS. FAILURE TO
OBSERVE THIS PRECAUTION
COULD RESULT IN SEVERE
BODILY INJURY OR LOSS OF
LIFE.

5
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
and T2 or U1 and V1.
Grounding
The user is responsible for insuring
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 or bolt is provided in
side the terminal box.
Due to the need to carry higher
frequency ground currents (from
switched voltage waveforms) the
ground connection/path must be low
impedance, not only low resistance.
Such ground currents exist during
normal operation on switched
(inverter) power.
Drive
RPM AC motors 56-L320 are sup
plied with a shaft suitable for a belt
or coupled drive.
Belt loads should be checked
against maximum allowable radial
loads under “Shaft Loads” section.
Contact Reliance Electric sales
office to deter mine L440 frame belt
load requirements.
Frames L360S and L400S are
suitable for coupled duty only; larger
shafts are supplied for belted duty.
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
1. Dynapar H20 - 10 pin M/S con-
nector
2. Lakeshore - Epic connector or
pigtail cable
The following chart is a universal
wiring guide for the latching Epic
connector or a pigtail cable. Wires
that are not used should be left
floating and should never be con-
nected to power or common. For
optimum EMI noiseimmunity con-
nect the encoder shield (pin 10 or
the braid wire) to the cable shield.
The encoder shield is internally
isolated from the encoder frame.
The cable shield should still be
connectedtogroundatthereceiv-
ing end. This encoder has a line
driver output. A pull-up resistor is
not required.
PIGTAIL CABLE
Connect the color coded wires to
match the individual signal
requirements.
DANGER
CONNECT AN APPROPRIATE
EQUIPMENT GROUNDING CON-
DUCTOR TO THE CONTROLLER
AND TERMINAL, THE MOTOR
FRAME, THE TRANSFORMER
ENCLOSURE IF USED, THE
CONTROLLER ELECTRICAL EN-
CLOSURE AND AN
APPROPRIATE GROUNDING
ELECTRODE. FAILURE TO OB-
SERVE THESE PRECAUTIONS
COULD RESULT IN SEVERE
BODILY INJURY OR LOSS OF
LIFE.
WARNING
INCORRECT MOTOR ROTATION
MAY CAUSE PERSONAL
INJURY OR DAMAGE THE
EQUIPMENT. CHECK DIREC-
TION OF MOTOR ROTATION
BEFORE COUPLING MOTOR TO
LOAD.
WARNING
INSURE THAT ALL GUARDS
ARE PROPERLY INSTALLED
BEFORE PROCEEDING. EXER-
CISE EXTREME CARE TO AVOID
CONTACTING ROTATING
PARTS. FAILURE TO OBSERVE
THESE PRECAUTIONS COULD
RESULT IN BODILY INJURY.
PIN# SIGNAL COLOR
1 Common Black
2BGreen
3ABlue
4 Z Violet
5 No Connection -
65-15VRed
7 /B Yellow
8/AGray
9/ZOrange
10 Shield Braid

6
Motor Application Data
Maximum Safe Speed
The speeds given in Table I 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 de sign
characteristics inherently prevent the
AC motor from exceeding the Mo tor
Maximum Safe Operating Speed
must prevent the motor from
exceeding the Maximum Safe
Speed if a single component failure
should occur.
Table I - Maximum Safe Speed
With special construction maximum
safe speed may differ from the
above values. In all cases, the
maximum safe speed is indicated on
the motor name plate.
NOTE: Normal operating speeds
must be limited to those listed in
order to meet nameplate rating and
assure validity of warranty.
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
RPM AC frames 56-L320 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 “Shaft Loads”
section. Frames L360-L440 are
supplied with larger shafts and roller
bearings when belted drives are
specified.
Shaft Loads - Axial and
Radial
RPM AC motors are suitable for
limited shaft loads as shown in
Tables III and IV. Recommended
maximum thrust loads depend on
the mounting position, either
horizontal or vertical. For
recommendations for loads in
excess of those shown, refer to the
local Reliance Electric office. For
higher speeds and special shaft
extensions please refer to the local
Reliance Electric sales office.
ONLY QUALIFIED ELECTRI-
CAL PERSONNEL FAMILIAR
WITH THE CONSTRUCTION
AND OPERATION OF THIS
EQUIPMENT AND THE HAZ-
ARDS INVOLVED SHOULD
INSTALL, ADJUST, OPERATE,
AND/OR SERVICE THIS
EQUIPMENT. READ AND
UNDERSTAND THIS MANUAL
IN ITS ENTIRETY BEFORE
PROCEEDING. FAILURE TO
OBSERVE THIS PRECAUTION
COULD RESULT IN SEVERE
BODILY INJURY OR LOSS OF
LIFE.
WARNING
THE MACHINERY BUILDER
AND/OR USER ARE RESPON-
SIBLE FOR INSURING THAT
ALL DRIVE TRAIN MECHA-
NISMS, THE DRIVEN
MACHINE, AND PROCESS
MATERIAL ARE CAPABLE OF
SAFE OPERATION AT THE
MAXIMUM SPEED AT WHICH
THE MACHINE WILL OPER-
ATE. FAILURE TO OBSERVE
THESE PRECAUTIONS COULD
RESULT IN BODILY INJURY.
Frame Diameter Maximum Safe Speed RPM
56, 140T, W180T 5400
L180 7200
L210 5000
L250 5000
L280 5000
L320 4000
L360 3750
L400 3750
L440 2700

7
Table III - Axial Thrust Capacity in Pounds/Kilograms - No Radial Load
(1) Thrust capacityfor vertical mounting includes a constant whose valueis plus or minus depending on the directionof thethrust load. Theconstant
is plus for thrust loads acting upward against the force of gravity and minus for loads acting downward with gravity.
Table IV - Radial Load Capacity* - No Axial Load
(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.
*Contact Reliance Electric sales office to determine L440 frame belt load requirements.
Horizontal Mounting Vertical Mounting (1)
Frame 2500 rpm 1750 rpm 1150 rpm 850 rpm 2500 rpm 1750 rpm 1150 rpm 850 rpm
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
kilograms 590 703 816 930 619 + 492 726 + 492 846 + 492 943 + 492
Caution: 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,
pretension for centrifugal force on the belts, pre-tension for high start torques, rapid acceleration or deceleration, pre-
tension for drives with short act-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.
Frame
Radial Load Capacities
at the End of the Shaft in Lbs.
2500 rpm 1750 rpm 1150 rpm 850 rpm
56, 140T, W180T 85 85 85 85
L180 445 445 445 445
L210 875 875 875 875
L250 1375 1525 1525 1525
L280 1550 1755 1755 1755
L320 1685 1800 1800 1800
UL360(1) 2550 2875 3300 3310
UL400(1) 3625 4090 4700 5190

8
Operation
Motor Start-Up
In addition to observing the above
pre cautions, the following items
must be checked before starting.
• Stop and remove power from the
motor per the Controller
Instruction Manual directions.
• Verify the DC bus voltage is zero
per the Controller Instruction
Manual.
1. The interior of the motor should
be clean and dry.
2. Connections should be tight.
3. The driven machine should be un
loaded if possible.
NOTE: 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 dam
age. Before attempting any repairs,
please contact the local Reliance
Electric Sales/Service office.
All RPM AC motors are lubricated be
fore 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 Section.
Balance
Motors are dynamically balanced to
commercial limits unless ordered
differently. Balance is done with a full
length 1/2height shaft key. A full
shaft key is shipped with motor.
Sheave or coupling should be
balanced with a 1/2height shaft key.
Std. Dynamic Balance Limits
DANGER
ONLY QUALIFIED ELECTRICAL
PERSONNEL FAMILIAR WITH
THE CONSTRUCTION AND
OPERATION OF THIS EQUIP-
MENT AND THE HAZARDS
INVOLVED SHOULD INSTALL,
ADJUST, OPERATE, AND/OR
SERVICE THIS EQUIPMENT.
READ AND UNDERSTAND THIS
MANUAL IN ITS ENTIRETY
BEFORE PROCEEDING. FAIL-
URE TO OBSERVE THIS PRE-
CAUTION COULD RESULT IN
SEVERE BODILY INJURY OR
LOSS OF LIFE.
WARNING
BEFORE INITIAL START-UP
OBSERVE THE FOLLOWING
PRECAUTIONS.
1. REMOVE ALL UNUSED SHAFT
KEYS AND LOOSE ROTATING
PARTS TO PREVENT THEM
FROM FLYING OFF. REPLACE
COVERS AND PROTECTIVE
DEVICES.
2. WHEN THE RPM AC MOTOR IS
SUPPLIED AS PART OF DRIVE
SYSTEM, REFER TO THE
DRIVE SYSTEM INSTRUC-
TION MANUAL FOR OPERAT-
ING INSTRUCTIONS.
TACHOMETER FEEDBACK
MUST BE PROPERLY CON-
NECTED FOR CLOSED LOOP
OPERATION. REVERSE
POLARITIES OR BROKEN
CONNECTIONS CAN CAUSE
DANGEROUSOVERSPEEDS.
FAILURE TO OBSERVE THESE
PRECAUTIONS COULD RESULT
IN BODILY INJURY.
DANGER
THE EQUIPMENT IS AT LINE
VOLTAGE WHEN AC POWER IS
CONNECTED. DISCONNECT
AND LOCKOUT ALL
UNGROUNDED CONDUCTORS
OF THE AC POWER LINE. FAIL-
URE TO OBSERVE THESE PRE-
CAUTIONS COULD RESULT IN
SEVERE BODILY INJURY OR
LOSS OF LIFE.
DANGER
THE CONTROLLER MAY APPLY
HAZARDOUS VOLTAGES TO
THE MOTOR LEADS AFTER
POWER TO THE CONTROLLER
HAS BEEN TURNED OFF. VER-
IFY THAT THE CONTROLLER IS
INCAPABLE OF DELIVERING
HAZARDOUS VOLTAGES AND
THAT THE VOLTAGE AT THE
MOTOR LEADS IS ZERO
BEFORE PROCEEDING. FAIL-
URE TO OBSERVE THIS PRE-
CAUTION COULD RESULT IN
SEVERE BODILY INJURY OR
LOSS OF LIFE.
WARNING
SURFACE TEMPERATURE OF
MOTOR ENCLOSURE MAY
REACH TEMPERATURES
WHICH CAN CUASE DISCOM-
FORT OR INJURY TO PERSON-
NEL COMING INTO CONTACT
WITH HOT SURFACES. THE
USER MUST APPLY APPROPRI-
ATE GUARDS AND/OR SHIELDS
TO PROTECT AGAINST ACCI-
DENTAL CONTACT WITH
MOTOR SURFACE. FAILURE TO
OBSERVE THIS PRECAUTION
MAY RESULT IN BODILY INJURY.
Highest Rated
Speed, rpm Max. Amplitude in Inches
3.000 - 4,000
1,500 - 2,999
1,000 - 1,499
Up to 999
0.0010
0.0015
0.0020
0.0025