Nidec Leroy-Somer PLSES Series Maintenance and service guide

LS / LSES, aluminium motors
FLSES, cast iron motors
PLSES, IP23 drip-proof motors
Three-phase induction
motors
Installation & maintenance
Part number: 4850 en - 2018.11 / f

2
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
IMPORTANT
Thesesymbols appearinthisdocumentwheneveritisimportanttotakespecialprecautionsduringinstallation,
operation, maintenance or servicing of the motors.
It is essential that electric motors are installed by experienced, qualied and authorized personnel.
In accordance with the main requirements of EU Directives, the safety of people, animals and property should be
ensured when tting the motors into machines.
Particular attention should be given to equipotential ground or earthing connections.
The noise level of the machines, measured under standard conditions, conforms to the requirements of the standard.
The following preliminary precautions must be taken before working on any stationary device:
• mains voltage disconnected and no residual voltage present
• careful examination of the causes of the stoppage (blocked transmission - loss of phase
- cut-out due to thermal protection - lack of lubrication, etc)

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
Dear Customer,
You have just acquired a LEROY-SOMER motor.
This motor benets from the experience of one of the largest manufacturers in the world, using state-of-the-art technology in
automation, specially selected materials and rigorous quality control. As a result, the regulatory authorities have awarded our motor
factories the ISO 9001 - Edition 2015 international certicate.
We thank you for making this choice, and would ask you to read the contents of this manual.
By observing a few essential rules, you will ensure problem-free operation for many years.
MOTEURS LEROY-SOMER
CE conformity
Our motors conform to standard EN/IEC 60034-1, and to the directives 2014/35/EU (low voltage) modied by Directive 2006/42/EC
(machine), which is demonstrated by their marking with the symbol
NOTE :
LEROY-SOMER reserves the right to modify the characteristics of its products at any time in order to incorporate the latest technological
developments. The information contained in this document may therefore be changed without notice.
Copyright 2018 : MOTEURS LEROY-SOMER
This document is the property of MOTEURS LEROY-SOMER.
It may not be reproduced in any form without prior authorization.
All brands and models have been registered and patents applied for.

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
CONTENTS
1 - RECEIPT ............................................................... 5
1.1 - Identication............................................................5
1.2 - Storage ...................................................................6
2 - ASSEMBLY ........................................................... 6
2.1 - Checking the insulation ...........................................6
2.2 - Location - ventilation ...............................................7
2.3 - Coupling..................................................................7
2.4 - Electrical guidelines ..............................................10
2.5 - Mains connection ..................................................13
3 - ROUTINE MAINTENANCE ................................. 16
3.1 - Lubrication ............................................................16
3.2 - Bearing maintenance ............................................20
4 - PREVENTIVE MAINTENANCE........................... 20
5 - TROUBLESHOOTING GUIDE............................ 21
6 - CORRECTIVE MAINTENANCE: GENERAL ...... 22
6.1 - Dismantling the motor ...........................................22
6.2 - Checks before reassembly....................................22
6.3 - Mounting the bearings on the shaft........................22
6.4 - Reassembling the motor........................................22
6.5 - Reassembling the terminal box .............................22
7 - POSITION OF LIFTING RINGS........................... 23
8 - SPARE PARTS.................................................... 24
9 - RECYCLING........................................................ 24
DISMANTLING AND REASSEMBLY
PROCEDURES
10 - LS/LSES MOTORS ........................................... 26
10.1 - 71 to 160 MP/LR motors......................................26
10.2 - 160 M/L/LU, 180 MT/LR motors ..........................28
10.3 - 180 L/LUR, 200 L/LR/LU, 225 ST/MT/MR,
250 MZ motors ....................................................30
10.4 - 225 MG, 250 ME/MF, 280 SC/MC/SD/MD,
315 SN motors.....................................................32
10.5 - 280 SU/SK/MK, 315 (except SN) motors.............34
11 - FLS/FLSES MOTORS....................................... 36
11.1 - 80 to 132 motors..................................................36
11.2 - 160, 180 MR motors ............................................38
11.3 - 180 M/L/LUR, 200 LU, 225 MR/SR motors ..........40
11.4 - 225 M to 280 motors ............................................42
11.5 - 315 to 355 LD motors...........................................44
12 - PLS/PLSES MOTORS ...................................... 46
12.1 - 180 LG/LGU, 200 M/L/LP/LU/LR,
225 MR motors ....................................................46
12.2 - 225 MG, 250, 280 SC/SD/MC/MD motors ...........48
12.3 - 280 MG, 315 motors............................................50
INDEX
Adjustment ...........................................................................8
Alarms - early warning ........................................................12
Assembly..............................................................................6
Balancing..............................................................................7
Belts......................................................................................9
Built-in thermal protection ...................................................12
Cable gland.........................................................................13
Cables: cross-section .................................................. 14 - 15
Capacitors .......................................................................... 11
Connection .........................................................................15
Connection diagrams..........................................................15
Corrective maintenance......................................................22
Coupling .......................................................................... 7 - 8
Coupling sleeves ..................................................................8
Digistart ..............................................................................10
Direction of rotation.............................................................15
Draining condensation .......................................................16
Earth terminal .....................................................................15
Earthing .............................................................................. 11
European directives..............................................................5
Frequency inverter.............................................................. 11
Greasing - Grease nipples ...................................... 6 - 16 - 20
Handling ...............................................................................7
Identication .........................................................................5
Inertia ywheel......................................................................8
Insulation .............................................................................6
Lifting rings .........................................................................23
Location ...............................................................................7
Logos ...................................................................................5
Lubrication..........................................................................16
Mains connection................................................................13
Nameplate ............................................................................5
Power .................................................................................10
Power supply ......................................................................15
Preventive maintenance .................................................... 20
Protection ...........................................................................12
Pulleys..................................................................................9
Receipt .................................................................................5
Routine maintenance......................................................... 20
Shields......................................................................... 16 - 20
Slide rails ..............................................................................9
Space heaters.....................................................................12
Spare parts ........................................................................ 24
Starting ...............................................................................10
Storage.................................................................................6
Terminal box ......................................................................13
Terminal box: tightening the nuts.........................................15
Tie rods: tightening .............................................................22
Tolerances ............................................................................8
Troubleshooting..................................................................21
Ventilation.............................................................................7

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
RECEIPT
Please quote when
ordering spare parts
1 - RECEIPT
On receipt of your motor, check that it has not suffered any damage in transit.
If there are obvious signs of knocks, contact the carrier (you may able to claim on their insurance) and after a visual check, turn the
motor by hand to detect any malfunction.
1.1 - Identication
As soon as you receive the motor, check that the nameplate on the machine conforms to your order.
MOT 3 ~ : 3-phase A.C. motor
LSES : Series
132 : Frame size
S: Housing symbol
Motor no.
123456 : Motor batch number
E: Month of production
11 : Year of production
001 : Serial number
IE2 :Efciencyclass
83.8% :Efciencyat4/4load
IP55 IK08: Index of protection
I cl. F : Insulation class F
40°C : Ambient operating
temperature
S1 : Duty - Duty (operating) factor
kg : Weight
V: Supply voltage
Hz : Supply frequency
min-1 : Revolutions per minute (rpm)
kW : Rated output power
cos ϕ: Power factor
A: Rated current
Δ: Delta connection
Y: Star connection
Bearings
DE : Drive end bearing
NDE : Non drive end bearing
g: Amount of grease at each
regreasing (in g)
h: Regreasing interval
(in hours)
POLYREX EM103 : Type of grease
A: Vibration level
H: Balancing mode
Denition of symbols used on nameplates:
Legal mark of conformity
of product to the requirements
of European Directives
* Other logos may be used as an optional extra:
This must be agreed prior to ordering.

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Installation and maintenance - Three-phase induction motors
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ASSEMBLY
1.2 - Storage
Prior to commissioning, machines should be stored in a
horizontal position:
- Away from humidity: at relative humidity levels greater than
90% the machine insulation can drop very rapidly, to just above
zero at around 100%. The state of the anti-rust protection on
unpainted parts should be monitored.
For very long storage periods the motor can be placed in a
sealed package (for example heat-shrunk plastic) containing
sachets of desiccant.
- Away from frequent signicant variations in temperature, to
avoid the risk of condensation. During storage the drain plugs
must be removed to allow condensation water to escape.
- If the area is subject to vibration, try to reduce the effect of this
vibration by placing the motor on a damping support (rubber
plate or similar) and turn the rotor a fraction of a turn once a
fortnight to prevent the bearing rings from becoming marked.
- Do not discard the rotor locking device (where there are roller
bearings).
Even if the motor has been stored in the correct conditions,
certain checks must be carried out before it is started up:
Greasing
Bearings which cannot be regreased
Maximum storage: 3 years.After this time, replace the bearings
(see section 6.3).
Bearings which can be regreased
Grease
grade 2
Grease
grade 3
Storage period
less than
6 months
less than
1 year
The motor can be commissioned
without regreasing.
more than
6 months
less than
1 year
more than
1 year
less than
2 years
Regrease before commissioning,
as described in section 3.1
more than
1 year
less than
5 years
more than
2 years and
less than
5 years
Dismantle the bearing
- Clean it
- Replace the grease completely
more than
5 years
more than
5 years
Change the bearing
- Regrease it completely
Greases used by LEROY-SOMER
(see nameplate): - grade 3: ESSO UNIREX N 3
- POLYREX EM103
2 - ASSEMBLY
Electric motors are industrial products.
They must therefore be installed by
qualied, experienced and authorized personnel. The
safety of people, animals and property must be ensured
when tting the motors into machines (please refer to
current standards).
2.1 - Checking the insulation
Before starting the motor, it is advisable to check
the insulation between the phases and earth,
and between phases.
This check is essential if the motor has been stored for longer
than 6 months or if it has been kept in a damp atmosphere.
This measurement must be carried out using a megohmmeter
at 500V D.C. (do not use a magnetoelectric system).
It is better to carry out an initial test at 30 or 50 volts and if the
insulation is greater than 1 megohm, carry out a second test at
500 volts for 60 seconds. The insulation value must be at least
10 megohms in cold state.
If this value cannot be achieved, or if the motor may have been
splashed with water or salt spray, or kept for a long period in a
very humid place or if it is covered with condensation, it is
advisable to dry the stator for 24 hours in a drying oven at a
temperature of between 110°C and 120°C.
If it is not possible to place the motor in a drying oven:
- Switch on the motor, with the rotor locked, at 3-phase A.C.
voltage reduced to approximately 10% of the rated voltage, for
12 hours (use an induction regulator or a reduction transformer
with adjustable outlets). For slip-ring motors, this test should
be performed with the rotor short-circuited.
- Or supply the 3 phases in series with a D.C. current, with the
voltage at 1 to 2% of the rated voltage (use a D.C. generator
with independent excitation or batteries for motors of less than
22 kW).
- NB: The A.C. current must be monitored using a clamp
ammeter, and the D.C. current using a shunt ammeter. This
current must not exceed 60% of the rated current.
It is advisable to place a thermometer on the motor housing: if
the temperature exceeds 70 °C, reduce the indicated voltage
or current by 5% of the original value for every 10° difference.
While it is drying, all the motor orices must be open (terminal
box, drain holes).
M
Warning: If the high voltage test, carried out at
thefactory beforedispatch,needsto berepeated,
it should be performed at half the standard voltage, ie.:
1/2 (2U+1000V). Check that the capacitive effect
resulting from the high voltage test is eliminated before
connecting the terminals to earth.
In all cases, compatibility of the motor and its
environment must be guaranteed before its installation
and also throughout its life.
For all insulation or dielectric tests, it is advisable to
earth the thermal probes and/or accessories.

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
Prior to commissioning for all motors:
Rotate the motor at no load (no mechanical load)
for 2 to 5 minutes, checking that there is no abnormal
noise. If there is any abnormal noise, see section 5.
2.2 - Location - ventilation
2.2.1 - TEFV motors
Our motors are cooled in accordance with method IC 411
(standard IEC 34-6), i.e. «machine cooled by its surface, using
the ambient uid (air) owing along the machine».
The fan at the non drive end cools the motor. Air is sucked in
through the grille of a fan cover (which provides protection
against the risk of direct contact with the fan in accordance with
standard IEC 34-5) and blown along the housing ns to ensure
thermal equilibrium of the motor whatever the direction of
rotation.
2.2.2 - Drip-proof motors
Location ventilation
Our motors are cooled in accordance with method IC 01
(standard IEC 34-6), ie. «machine cooled by means of the
ambient uid (air) circulating inside the machine».
A fan at the non-drive end cools the motor. Air is sucked in at
the front of the motor and blown along the fan cover to ensure
thermal equilibrium of the motor whatever the direction of
rotation.
H
Ø H
max
air
inlet
The motor must be installed in an adequately ventilated area,
withclearance for the airintake and outletof at least onequarter
of the frame size.
Obstruction (clogging) - even accidental - of the fan cover grille
has an adverse effect on motor operation.
In the case of vertical operation with the shaft extension facing
down, it is advisable to t the motor with a drip cover to prevent
penetration by any foreign bodies.
It is also necessary to check that the hot air is not being
recycled. If it is, pipes must be provided for the intake of cold
air and the discharge of hot air, in order prevent abnormal
motor temperature rise.
In this case, if the air is not circulated by an auxiliary fan, the
dimensions of the pipes must be such that the pressure losses
are negligible compared to those of the motor.
Positioning
The motor must be mounted in the position specied on
the order, on a base which is rigid enough to prevent
distortion and vibration.
Where the motor feet have six xing holes, it is preferable to
use those which correspond to the standard dimensions for the
motor power rating (refer to the technical catalogue for
induction motors), or, failing that, to those shown at B2.
Ensure there is easy access to the terminal box, the
condensation drain plugs and, if appropriate, to the grease
nipples.
Use lifting equipment which is compatible with the weight of the
motor (indicated on the nameplate).
When the motor is tted with lifting rings, they are
for lifting the motor on its own and must not be
used to lift the whole machine after the motor has been
tted to it.
Note 1: When installing a suspended motor, it is essential
to provide protection in case the xing breaks.
Note 2: Never stand on the motor.
2.3 - Coupling
Preparation
Turn the motor by hand before coupling to detect any possible
fault due to handling.
Remove any protection from the shaft extension.
Drain off any condensation water which may have formed
inside the motor by removing the plugs from the drain holes.
Rotor locking device
For made-to-order motors with roller bearings, remove the
rotor locking device.
In exceptional circumstances when the motor has to be moved
after the coupling device has been tted, the rotor must be re-
immobilised.
1/4 H min
(with a minimum
distance of 25 mm)
H
B
2
B
1

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
Balancing
Rotating machines are balanced in accordance with standard
ISO 8821:
- Half-key when the shaft extension is marked H
- No key when the shaft extension is marked N.
- Full key when the shaft extension is marked F.
and any coupling element (pulley, coupling sleeve, slip-ring,
etc) must therefore be balanced accordingly.
Motor with 2 shaft extensions:
If the second shaft extension is not used, in order to
comply with the balancing class, the key or half-key must
be xed rmly in the keyway so that it is not thrown out
during rotation (H or F balancing) and must be protected
against direct contact.
Precautions
All measures must be taken to ensure protection against the
risks which arise when there are rotating parts (coupling
sleeve, pulley, belt etc).
If a motor is started up without a coupling device
having been tted, carefully immobilize the key in
its location.
Beware of backdriving when the motor is switched off. The
appropriate precautions must be taken:
- For pumps, a non-return valve must be installed.
- For mechanical devices, install a backstop or a holding brake.
- etc..
Tolerances and adjustments
The standard tolerances are applicable to the mechanical
characteristics given in our catalogues. They comply fully with the
requirements of IEC standard 72-1.
- Users must adhere strictly to the instructions provided by the
transmission device supplier.
-Avoid impacts which could damage the bearings.
Use a spanner and the tapped hole of the shaft end with a special
lubricant (e.g. molykote grease) to make it easier to t the coupling.
The hub of the transmission device must be:
- Fully in contact with the shoulder of the shaft or, if this is missing,
against the metal stop ring which forms a labyrinth seal and thus
locks the bearing in place (do not crush the seal).
- Longer than the shaft extension (2 to 3 mm) so that it can be
tightened using a screw and washer. If it is not, a spacer ring
must be inserted without cutting the key (if this ring is large, it
must be balanced).
Applied
to shoulder of shaft
Applied
to stop ring
If there is a second shaft extension, it must only be used for
direct coupling and the same recommendations must be
followed.
The 2nd shaft extension may also be smaller than
the main shaft extension, and under no
circumstances can it deliver torques greater than half the
rated torque.
The inertia ywheels device must not be mounted directly
onto the shaft extension, but installed between end shield and
device using a coupling.
Mounting a face mounted motor
Mounting face mounted motors IM B14 (IM 3601) and IM B34
(IM 2101).
Max. screw insertion length when mounting face mounted
motors IM B34 and IM B14.
Max. insertion (mm)
LSES 71 F75 M5 / F85 M6 13
LSES 80 F100 M6 11
LSES 90 F115 M8 11
LSES 100 F130 M8 11
LSES 112 F130 M8 11
LSES 132 F215 M12 11
LSES 160 F215 M12 15
Direct connection onto the machine
When the mobile device (pump or fan turbine) is mounted
directly on the motor shaft extension, check that this device is
perfectly balanced and that the radial force and the axial thrust
are within the limits indicated in the catalogue for the bearing
withstand.
Direct connection using a exible coupling
Selection of the coupling sleeve should take account of the
rated torque to be transmitted and the safety factor dependent
on the starting conditions for the electric motor.
The machines must be carefully aligned, so that any lack of
concentricity and parallelism in the two coupling halves is
compatible with the recommendations of the coupling sleeve
manufacturer.
Both parts of the coupling should be provisionally assembled
to make it easier to alter their relative position.
Adjust the parallel plane of both shafts using a gauge.
Measure the distance between the two coupling surfaces at
one point on the circumference. Rotate them 90°, 180° and
270° in relation to this initial position, and measure each time.
The difference between the two extremes of the value «x»
must not exceed 0.05 mm for standard couplings.

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
x
To perfect this adjustment and at the same time check the
concentricity of the two shafts, t 2 gauges as shown in the
diagram and slowly turn both shafts.
The deviations registered by either shaft will indicate the need
for either an axial or radial adjustment if the deviation exceeds
0.05mm.
Direct connection using a rigid coupling
Both shafts must be aligned so as to adhere to the tolerances
of the coupling sleeve manufacturer.
Maintain the minimum distance between the two shaft
extensions to allow for expansion of the motor shaft and the
load shaft.
A
Ø
Ø (mm) A (mm)
min.
9 to 55 1
60 1.5
65 1.5
75 2
80 2
Transmission via belt pulleys
The user can choose the diameter of the pulleys.
Cast iron pulleys with a diameter greater than 315 are not
recommended for rotation speeds of 3000 min-1.
Flat belts cannot be used for rotation speeds of 3000 min-1 or
more.
Positioning the belts
So that the belts can be correctly positioned, allow for
possible adjustment of approximately 3% with respect to the
calculated distance E.
Force must never be used when tting the belts.
For notched belts, position the notches in the pulley grooves
E
Aligning the pulleys
Check that the motor shaft is completely parallel with that of the
receiving pulley.
Protect all rotating devices before power-up.
Adjusting the tension of the belts
The tension of the belts must be adjusted very carefully in
accordance with the recommendations of the belt supplier and
the calculations made when the product was specied.
Reminder:
- Tension too great = unnecessary force on the end shields
which could lead to premature wear of the bearing unit (end
shield-bearings) and eventually break the shaft.
- Too little tension = vibration (wearing of the bearing unit).
Fixed distance between centers:
Place a belt tensioning pulley on the slack side of the belts:
- Smooth pulley on the outside of the belt
- Grooved pulley on the inside of the belts when using V-belts.
Adjustable distance between centers:
The motor is usually mounted on slide rails, which enables
optimum adjustment of the pulley alignment and the belt
tension.
Place the slide rails on a perfectly horizontal baseplate.
The lengthways position of the slide rails is determined by the
length of the belt, and the crossways position by the pulley of
the machine being driven.
Mount the slide rails rmly with the tension screws in the
direction shown in the diagram (the slide rail screw on the belt
side between the motor and the machine being driven).
Fix the slide rails onto the baseplate and adjust the belt tension
as before.
Tension screw
Tension screw

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
2.4 - Electrical guidelines
2.4.1 - Limiting problems caused by motor
starting
In order to protect the installation, any signicant temperature
rise in the cabling conduits must be prevented, while ensuring
that the protection devices do not interrupt starting.
Operating problems in other equipment connected to the same
supply are due to the voltage drop caused by the current
demand on starting - many times greater than the current
absorbed by the motor at full load (approximately 7).
See the LEROY-SOMER induction motors technical
catalogue).
Even though the mains supplies increasingly allow D.O.L.
starting, the current inrush must be reduced for certain
installations.
Jolt-free operation and soft starting ensure greater ease of use
and an increased lifespan for the machines being driven.
The two essential parameters for starting cage induction
motors are:
- starting torque
- starting current
The starting torque and the resistive torque determine the
starting time.
Depending on the load being driven, it may be necessary to
adapt the torque and the current to the machine starting time
and to the possibilities of the mains power supply.
The ve essential modes are:
- D.O.L. starting
- Star/delta starting
- Soft starting with autotransformer
- Soft starting with resistors
- Electronic starting
The «electronic» starting modes control the voltage at the
motor terminals during the entire starting phase and enable
very soft, jolt-free starting.
2.4.2 - LEROY-SOMER «Digistart» electronic
starter
Thisis a multi-function electronic systemwith a microcontroller,
which is used with all 3-phase cage induction motors.
It provides soft starting of the motor with:
- Reduction of the starting current
- Gradual, jolt-free acceleration, achieved by controlling the
current absorbed by the motor.
After starting, the DIGISTART performs additional motor
control functions in its other operating phases: steady state
and deceleration.
- 18 to 1600 A models
- Supply: 220 to 700 V - 50/60 Hz
DIGISTART is economical to install, as a fused switch is the
only additional device needed.
Optional: Standard slide rails (conforming to standard NFC 51-105)
These steel slide rails are supplied with tension screws and the 4 nuts and bolts for xing the motor on the slide rails, but the xing
bolts for the slide rails are not supplied.
Motor Type Dimensions Weight per pair
frame size of slide rail A E H K L X Y Z Ø J of slide rails (kg)
90 G 90/8 PM 355 395 40 2.5 50 324 264 294 13 3
100, 112 and 132 G 132/10 PM 420 530 49.5 7 60 442 368 405 15 6
160 and 180 G 180/12 PM 630 686 60.5 7 75 575 475 525 19 11
200 and 225 G 225/16 PF 800 864 75 28.5 90 - 623 698 24 16
250 and 280 G 280/20 PF 1000 1072 100 35 112 - 764 864 30 36
315 and 355 G 355/24 PF 1250 1330 125 36 130 - 946 1064 30 60
H
L
Y
Z
X
A
E
K
ØJ

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Installation and maintenance - Three-phase induction motors
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ASSEMBLY
2.4.3 - Other control systems
Frequency inverters, ux vector control, etc. Special
precautions need to be taken when standard induction motors
are being used for variable speed control, powered by a
frequency inverter or voltage controller:
The reference voltage (drive output or motor
input) is 400V at 50 Hz: The drive must deliver a
constant voltage/frequency signal to the motor in the
50 Hz operating range. Beyond the 25/50 Hz range,
ensure that the fan and bearing unit are suitable.
During prolonged operation at low speed, cooling efciency is
greatly diminished. It is therefore advisable to install a forced
ventilation unit that will produce a constant ow of air
independently of the motor speed.
In prolonged operation at high speed, the fan may make
excessive noise. It is again advisable to install a forced
ventilation system.
1/3
2/3
1
01/3 2/3 1
N / Ns
Forced ventilation
(temperature rise) Natural cooling Forced ventilation for N > 3600 min-1
Operating speed/
Synchronous speed
Effect of
cooling
P/PN= f (N/NS)
If the frequency exceeds 50 Hz:
a - Carefully check that all the components on a particular
transmission are properly aligned.
b - The voltage remains constant above 50 Hz.
c - The power supplied by the motor up to 60 Hz remains
constant (make sure that the power absorbed by the load does
not vary differently in this frequency range).
d - Check that the application speed does not exceed the
synchronous speed values:
- 2P --> 3600 min-1 motors
- 4P --> 1800 min-1 motors
- 6P --> 1200 min-1 motors
e - For all other frequency and/or voltage limits, additional
precautions must be taken for derating, bearings, ventilation,
noise, etc: please consult Leroy-Somer.
Check that the vibration level of the assembled machine
complies with standard ISO 10816-3.
The user is responsible for protecting the motor and drive
equipment from hazardous currents and overvoltages in the
winding. These instructions cannot guarantee efciency in all
cases.
2.4.4 - Permissible starting times and locked
rotor times
The starting times must remain within the limits stated below
on condition that the number of starts per hour is 6 or less.
Three successive cold starts and two consecutive warm starts
are allowed.
Permissible motor starting time in relation to the ratio ID/ IN.
2.4.5 - Earthing (see section 2.5.5)
2.4.6 - Power factor compensation capacitors
Before any work is carried out on the motor or in
the cabinet, check that the capacitors are
isolated and/or discharged (read the voltage at the
terminals).
2.4.7 - Motor protection devices
2.4.7.1 - On-line protection
Adjusting the thermal protection
It should be adjusted to the value of the current read on the
motor nameplate for the connected mains voltage and
frequency.
Thermal magnetic protection
The motors must be protected by a thermal magnetic device
located between the isolating switch and the motor. These
protection devices provide total protection of the motor against
non-transient overloads.
This device can be accompanied by fused circuit-breakers.
Built-in direct thermal protection
For low rated currents, bimetallic strip-type protection may be
used. The line current passes through the strip, which shuts
down or restores the supply circuit as necessary. The design
of this type of protection allows for manual or automatic reset.
2.4.7.2 - Built-in indirect thermal protection
The motors can be equipped with optional heat sensors.
These sensors can be used to monitor temperature changes
at “hot spots”:
- overload detection
- cooling check
- Monitoring strategic points for maintenance of the installation
25
20
15
Time (s)
10
5567Id/In 8 9 10
Hot startCold start

12
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
It must be emphasized that these sensors cannot be used to carry out direct adjustments to the motor operating cycles.
Type Operating
principle
Operating
curve
Breaking
capacity (A) Protection provided Mounting Number required*
Normally closed
thermostat
PTO
bimetallic strip,
indirectly heated
operates on opening (0)
I
ONRT
T
I
FNRT
T
R
NRT
T
V
T
R
T
1.6 at 250 V
with cos ϕ0.6
general surveillance
for non-transient
overloads
Mounted on control
circuit
2 or 3 in series
Normally open
thermostat
PTF
bimetallic strip,
indirectly heated,
contact on closing (F) 1.6 at 250 V
with cos ϕ0.6
general surveillance
for non-transient
overloads
Mounted on control
circuit
2 or 3 in parallel
Positive temperature
coefcient thermistor
PTC
Variable non-linear
resistor, indirectly
heated
0
general surveillance
for transient
overloads
Mounted with associated
relay on control circuit
3 in series
Thermocouples
T (T<150°C)
Constantan copper
K(T<1000°C)
Copper Copper-Nickel
Peltier effect 0
continuous
surveillance
at hot spots
at regular intervals
Mounted on control
panels with associated
reading device
(or recording device)
1 per hot spot
Platinum resistance
thermometer
PT 100
Variable linear
resistance,
indirectly heated
0
high accuracy
continuous
surveillance
at key hot spots
Mounted on control
panels with associated
reading device
(or recording device)
1 per hot spot
- NRT: nominal running temperature.
- The NRTs are chosen according to the position of the sensor in the motor and the temperature rise class.
* The number of devices affects the protection of the windings.
Alarm and early warning
All protective equipment can be backed up by another type of
protection (with different NRTs): The rst device will then act as
an early warning (light or sound signals given without shutting
down the power circuits), and the second device will be the
alarm (shutting down the power circuits).
Warning: Depending on the type of protection,
the motor may remain powered-up. Ensure that
the mains supply is disconnected before any work is
carried out in the terminal box or in the cabinet.
Protection against condensation: space heaters
Identication: 1 red label
A glass bre exible resistor is xed on 1 or 2 coil end turns.
This resistor heats the machines when stopped and thus
prevents condensation inside the machines.
Power supply: 230V single-phase unless otherwise specied
by the customer.
If the drain plugs at the bottom of the motor have not been
removed at the time of installation, they must be opened
approximately every 6 months.
Warning: Check that the space heaters are
powered down before any work is carried out in
the terminal box or in the cabinet.

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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
2.5 - Mains connection
2.5.1 - Terminal box
Placed as standard on the top of the motor near the drive end,
for forms IM B3, B5, B14, the terminal box has IP 55 protection.
Warning: The position of the terminal box cannot be easily
modied, even with anged motors, as the condensation drain
holes must be at the bottom.
Cable gland
The standard position of the cable gland (1) is on the right,
seen from the drive end.
AStandard
position
Standard
position
24
1
3
NB: motors are tted with plugs or a support plate as standard.
Tightening capacity of cable glands
Adapt the cable gland and
its reducer if present to the
diameter of the cable being used.
In order to preserve the motor’s
original IP55 protection, it is
essential to tighten the cable gland seal correctly (so
that it cannot be unscrewed by hand).
When there are several cable glands and some are not
being used, ensure that they are always covered and
tighten them so that they also cannot be unscrewed by
hand.
If the non-standard position of the cable gland has not been
correctly specied on the order, or is no longer suitable, the
symmetrical construction of the terminal box enables it to be
turned in any of the 4 directions except for position (2) on
ange-mounted motors (B5).
A cable gland must never open upwards.
Check that the incoming cables have bends of such a radius as
to prevent water from running into the cable gland.
Type
of cable gland
Ø min. - Ø max. (mm) cable
Polyamide cable
gland Brass cable gland
ISO M16 5 - 10 5.5 - 9.5
ISO M20 9.5 - 15 8.5 - 13
ISO M25 13 - 19 12 - 17
ISO M32 15 - 25 15 - 22
ISO M40 21 - 32 19.5 - 28
ISO M50 26 - 38 25.5 - 36
ISO M63 31 - 34 33 - 46
Ø mini
Ø maxi

14
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
2.5.2 - Cross-section of the power supply cables
The higher the current, the greater the voltage drop in the
cables (standard NFC 15.100 or end user’s national standard).
The voltage drop should therefore be calculated for the
starting current to see if this is suitable for the application.
If the most important criterion is the starting torque (or starting
time), the voltage drop should be limited to 3% maximum (the
equivalent of a loss of torque of around 6 to 8%).
Thechart belowcan beused toselect theconductorsaccording
to the length of the supply cables and the starting current, in
order to limit the voltage drop to 3% maximum.
This table does not allow the installer to dispense with checking the protective systems.
For motors with ying leads, the power supply cable must not be used for handling.
2.5.3 - Connection of the motor-drive unit
When controlling an induction motor by means of a variable
speed drive, certain rules must be adhered to in order to
guarantee correct system performance.
For variable speed applications, follow the recommendations
outlined in the good practice guide for Motor and drive
packages ref. 5626.
1234567891023456789 100 2345 23
45
67891000
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
Length in m Maximum voltage drop 3 % (3-phase circuits - copper cable)
Current in amps
Starting current
1 1.5 2.5 4 6 10 16 35 50 75 9025 Conductor cross-section

15
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
2.5.4 - Terminal block wiring diagram
All motors are supplied with a wiring diagram in the terminal
box*.
The connector links required for coupling can be found inside
the terminal box.
Single-speed motors are tted with a block of 6 terminals
complying with standard NFC 51 120, with the terminal
markings complying with IEC 34 - 8 (or NFC 51 118).
Particular attention must be paid to the
information on the nameplate in order to choose
the correct type of connection for the supply voltage.
2.5.5 - Direction of rotation
When the motor is powered by U1, V1, W1 or 1U, 1V, 1W from
a direct mains supply L1, L2, L3, it turns clockwise when seen
from the drive end.
If 2 phases of the power supply are changed over, the motor
will run in an anti-clockwise direction (make sure the motor has
been designed to run in both directions of rotation).
Warning: motor with backstop: starting in the wrong direction
destroys the backstop (see arrow on motor housing).
If the motor is tted with accessories (thermal protection or
space heater), these should be connected on screw dominos
or terminal blocks with labelled wires (see section 2.4).
Temperature probe
2.5.6 - Earth terminal
This is situated inside the terminal box; in some cases, the
earth terminal may be situated on one of the feet or on one of
the cooling ns (round motors).
It is indicated by the symbol:
It is compulsory to earth the motor. Earthing
must be performed in accordance with current
regulations (protection of workers).
* If required, this diagram should be obtained from the supplier,
specifying the motor type and number (shown on the motor
nameplate).
2.5.7 - Connecting the power supply cables to
the terminal block
The cables must be tted with connectors suitable for the cable
cross-section and the terminal diameter.
They must be crimped in accordance with the connector
supplier’s instructions.
Connection must be carried out with connector resting on
connector (see the diagrams below):
Tightening torque (N.m) on the terminal block nuts
Terminal M4 M5 M6 M8 M10 M12 M14 M16
Steel 1 2.5 4 10 20 35 50 65
Brass 1 2 3 6 12 20 - 50
If using cables without connectors, attach some calipers.
If any nuts on the brass terminal block are lost, they must be
replaced by brass nuts, not steel ones.
When closing the box, ensure that the seal is correctly
positioned.
As a general rule, check that no nut, washer or
other foreign body has fallen into or come into
contact with the winding.

16
Installation and maintenance - Three-phase induction motors
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ROUTINE MAINTENANCE
PERMANENTLY GREASED BEARINGS
Under normal operating conditions, the service life (L10h) in hours of the lubricant is indicated in the table below for ambient
temperatures less than 55°C.
Series Type
No. of
poles
Types of permanently
greased bearing
Grease life according to speed of rotation
3000 rpm 1500 rpm 1000 rpm
N.D.E. D.E. 25°C 40°C 55°C 25°C 40°C 55°C 25°C 40°C 55°C
LS/LSES
80 L 26203 CN 6204C3 ≥40000 ≥40000 25000 - - - - - -
80LG 2;4 6204C3 6205 C3 ≥40000 ≥40000 24000 ≥40000 ≥40000 31000 - - -
90 SL/L 2;4;6 ≥40000 ≥40000 34000
90 LU 46205 C3 6205 C3 - - - ≥40000 ≥40000 30000 - - -
100 L 2;4;6 6205 C3 6206 C3 ≥40000 ≥40000 22000 ≥40000 ≥40000 30000 ≥40000 ≥40000 33000
100 LR 4- - - - - -
112 M 26205 C3 6206 C3 ≥40000 ≥40000 22000 - - - - - -
112 MG 2 ; 6 ≥40000 ≥40000 33000
112 MU 46206 C3 6206 C3 - - - ≥40000 ≥40000 30000 - - -
132 S 2 ; 6 6206 C3 6208 C3 ≥40000 ≥40000 19000 - - - ≥40000 ≥40000 30000
132 SU 2;4 ≥40000 ≥40000 25000 - - -
132 SM/M 2;4;6 6207 C3 6308 C3 ≥40000 ≥40000 19000 ≥40000 ≥40000 25000 ≥40000 ≥40000 30000
132 MU
4;6 6307 C3 6308 C3 - - - ≥40000 ≥40000 25000 ≥40000 ≥40000 30000
160 MR 2;4 6308 C3 6309 C3 ≥40000 35000 15000 ≥40000 ≥40000 24000 - - -
160 MP 2;4 6208 C3 6309 C3 ≥40000 35000 18000 ≥40000 ≥40000 24000 - - -
160 M/MU 66210 C3 6309 C3 - - - - - - ≥40000 ≥40000 27000
160 L 2;4;6 ≥40000 30000 15000 ≥40000 ≥40000 23000
160 LUR 4;6
6210 C3 6310 C3 - - - ≥40000 ≥40000 23000 ≥40000 ≥40000 27000
180 MT 2;4 ≥40000 30000 15000 - - -
180 M 4
6212 C3 6310 C3 - - - ≥40000 ≥40000 24900 - - -
180 L 6 - - - ≥40000 ≥40000 28000
180 LR 4 6210 C3 6310 C3 - - - ≥40000 ≥40000 23000 - - -
180 LUR 4;6 6312 C3 6310 C3 - - - ≥40000 ≥40000 22000 ≥40000 ≥40000 27000
200 L 2 ; 6 6214C3 6312 C3 ≥40000 25000 12500 - - - ≥40000 ≥40000 27000
200 LR 2;4;6
6312 C3 6312 C3 ≥40000 25000 12500 ≥40000 ≥40000 22000 ≥40000 ≥40000 27000
200 LU 4;6 - - -
225 ST 4
6214C3 6313 C3 - - - ≥40000 ≥40000 21000 - - -
225 MT 2≥40000 22000 11000 - - -
225 SR 46312 C3 6313 C3
- - -
≥40000 ≥40000 21000
- - -
225 MR 2;4;6 ≥40000 22000 11000 ≥40000 ≥40000 26000
225 SG 46216 C3 6314C3 - - - ≥40000 ≥40000 20000 - - -
225 MG 4;6 ≥40000 ≥40000 25000
Note: on request, all motors can be tted with grease nipples except the 132 S/SU.
3 - ROUTINE MAINTENANCE
Checks after start-up
After approximately 50 hours’ operation, check that the screws
xing the motor and the coupling device are still tight.
In the case of chain or belt transmission, check that the tension
is correctly adjusted.
Cleaning
To ensure the motor operates correctly, remove any dust or
foreign bodies which might clog the cover grille and the housing
ns.
Precaution: before carrying out any cleaning operation check
that the motor is completely sealed (terminal box, drain holes,
etc).
Dry cleaning (vacuuming or compressed air) is always
preferable to wet cleaning.
Always clean at reduced pressure from the center
of the motor towards the extremities to avoid
introducing dust and particles under the seals.
Draining off condensation water
Temperature variations cause condensation to form inside
the motor, which must be removed before it adversely affects
motor operation.
Condensation drain holes, located at the bottom of the motors
(bearing in mind their operating position) are sealed with plugs
which must be removed and then replaced every six months (if
they were not replaced, the motor degree of protection would
no longer be maintained). Clean the orices and plugs before
reassembling them.
Note: In conditions of high humidity and signicant temperature
variations, a shorter period is recommended.
As long as it poses no risk to the motor protection, the
condensation drain plugs can be removed.
3.1 - Greasing
3.1.1 - Type of grease
When the bearings are not greased for life, the type of grease
is indicated on the nameplate.
As standard this grease is Polyrex EM103 and we recommend
that it is used for subsequent lubrication.
Avoid mixing greases.
3.1.2 - Permanently greased bearings
For LS/LSES and FLS/FLSES ≤ 225 motors, the bearings
dened offer long grease life and therefore lubrication for the
lifetime of the machines. The grease life according to speed of
rotation and ambient temperature is shown on the chart below.

17
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ROUTINE MAINTENANCE
Series Type
No. of
poles
Types of permanently
greased bearing
Grease life according to speed of rotation
3000 rpm 1500 rpm 1000 rpm
N.D.E. D.E. 25°C 40°C 55°C 25°C 40°C 55°C 25°C 40°C 55°C
FLS/FLSES
80 L 26203 CN 6204C3 ≥40000 ≥40000 25000 - - - - - -
80 LG
4
6204C3 6205 C3 - - - ≥40000 ≥40000 31000 - - -
90 SL/L
2;4;6 ≥40000 ≥40000 24000 ≥40000 ≥40000 34000
90 LU 2 ; 6 6205 C3 6205 C3 ≥40000 ≥40000 24000 - - - ≥40000 ≥40000 34000
100 L 2;4
6205 C3 6206 C3
≥40000 ≥40000 22000 ≥40000 ≥40000 30000 - - -
100 LG 4;6 - - - ≥40000 ≥40000 33000
112 MG
2 ; 6 ≥40000 ≥40000 22000 - - -
112 MU
4 6206 C3 6206 C3 - - - ≥40000 ≥40000 30000 - - -
132 SM/M
2;4;6 6207 C3 6308 C3 ≥40000 ≥40000 19000 ≥40000 ≥40000 25000 ≥40000 ≥40000 30000
132 MU 2;4 6307 C3 6308 C3 ≥40000 ≥40000 19000 ≥40000 ≥40000 25000 - - -
132 MR 4;6 6308 C3 6308 C3 - - - ≥40000 ≥40000 25000 ≥40000 ≥40000 30000
160 M 2;4;6 6210 C3 6309 C3 ≥40000 37800 18900 ≥40000 ≥40000 36900 ≥40000 ≥40000 20050
160 MU 6 - - - - - -
160 LUR 2;4;6 6210 C3 6310 C3 ≥40000 24500 12250 ≥40000 36400 18200 ≥40000 ≥40000 22450
180 M 26212 C3 6310 C3 34000 17000 8500 - - - - - -
180 MT 46210 C3 6310 C3 - - - ≥40000 35500 17750 - - -
180 MUR 26312 C3 6310 C3 ≥40000 22800 11400 - - - - - -
180 L 4;6 6212 C3 6310 C3 - - - ≥40000 39500 19750 ≥40000 ≥40000 29050
180 LUR 4;6 6312 C3 6310 C3 - - - ≥40000 ≥40000 22900 ≥40000 ≥40000 29900
200 LU 2;4;6 6312 C3 6312 C3 28600 14300 7150 ≥40000 25400 12700 ≥40000 33200 16600
225 S 4 6314C3 6314C3 - - - ≥40000 23700 11850 - - -
225 SR 46312 C3 6313 C3 - - - ≥40000 ≥40000 21500 - - -
225 M 4;6 6314C3 6314C3 - - - ≥40000 23700 11850 ≥40000 25600 12800
225 MR 26312 C3 6313 C3 ≥40000 22800 11400 - - - - - -
Note: on request, all motors can be tted with grease nipples.

18
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ROUTINE MAINTENANCE
3.1.3 - Bearings with grease nipples
The bearings are lubricated in the factory
The end shields are tted with bearings lubricated by grease
nipples such as Tecalemit-Hydraulic M8 x 125.
The frequency of lubrication and the quantity and
quality of grease are given on the nameplates and
these should be referred to in order to ensure correct
bearing lubrication.
Even in the event of prolonged storage or
downtime, the interval between 2 greasing
operations should never exceed 2 years.
Series Type
No. of
poles
Type of bearing for
bearings with grease nipples
Quantity
of grease
Greasing intervals in hours
3000 rpm 1500 rpm 1000 rpm
N.D.E. D.E. g25°C 40°C 55°C 25°C 40°C 55°C 25°C 40°C 55°C
LS/LSES
160 M/MU*
2;4;6 6210 C3 6309 C3 13 22200 11100 5550 32400 16200 8100 39800 19900 9950
160 L*
180 MR* 2
6210 C3 6310 C3 15
19600 9800 4900
---
- - -180 MT* 2;4
30400 15200 7600
180 LR* 4- - -
180 LUR* 4;6 6312 C3 6310 C3 20 - - - 26800 13400 6700 35000 17500 8750
180 M* 4
6212 C3 6310 C3 15 - - -
29200 14600 7300 - - -
180 L* 6 - - - 37200 18600 9300
200 LR* 2;4;6
6312 C3 6312 C3 20
15200 7600 3800
26800 13400 6700 35000 17500 8750
200 LU* 4;6 - - -
200 L* 2 ; 6 6214C3 6312 C3 20 14600 7300 3650 - - - 34600 17300 8650
225 ST* 4
6214C3 6313 C3 25
- - - 25200 12600 6300
- - -
225 MT* 2 10600 5300 2650 - - -
225 SR/MR* 2;4;6 6312 C3 6313 C3 25 13400 6700 3350 25200 12600 6300 33600 16800 8400
225 SG* 4
6216 C3 6314C3 25 - - - 23600 11800 5900
- - -
225 MG* 4;6 32200 16100 8050
250 MZ 26312 C3 6313 C3 25 13400 6700 3350 - - - - - -
250 ME 4;6
6216 C3 6314C3 25
- - - 16800 8400 16800 22800 11400 5700
280 SC/MC 2 11800 5900 2950 - - - - - -
280 SC 66216 C3 6316 C3 35 - - - - - - 32200 16100 8050
280 SD/MD 4;6 6218 C3 6316 C3 35 - - - 1900 3800 7600 29600 14800 7400
315 SN 26216 C3 6316 C3 35 5600 2800 1400 - - - - - -
315 MP 26317 C3 6317 C3 40 5200 2600 1300 - - - - - -
315 SP 4
6317 C3 6320 C3 50 - - - 14000 7000 14000
- - -
315 MP/MR 4;6 21200 10600 5300
* bearing with grease nipple available to order

19
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ROUTINE MAINTENANCE
Series Type
No. of
poles
Type of bearing for
bearings with grease nipples
Quantity
of grease
Greasing intervals in hours
3000 rpm 1500 rpm 1000 rpm
N.D.E. D.E. g25°C 40°C 55°C 25°C 40°C 55°C 25°C 40°C 55°C
FLS/FLSES
160 M* 2;4;6 6210 C3 6309 C3 13 22200 11100 5550 32400 16200 8100 39800 19900 9950
160 MU 6 - - - - - - 23400 11700 5850
160 LUR* 2;4;6 6210 C3 6310 C3 15 19600 9800 4900 30400 15200 7600 38200 19100 6600
180 M* 26212 C3 6310 C3 15 18000 9000 4500 - - - - - -
180 MT* 46210 C3 6310 C3 15 - - - 30400 15200 7600 - - -
180 MUR* 26312 C3 6310 C3 15 10600 5300 2650 - - - - - -
180 L* 4;6 6212 C3 6310 C3 20 - - - 29200 14600 7300 37200 18600 9300
180 LUR* 4;6 6312 C3 6310 C3 20 - - - 26800 13400 6700 35000 17500 8750
200 LU* 2;4;6 6312 C3 6312 C3 20 15200 7600 3800 26800 13400 6700 35000 17500 8750
225 S* 4 6314C3 6314C3 25 - - - 23600 11800 5900 - - -
225 SR* 46312 C3 6313 C3 25 - - - 25200 12600 6300 - - -
225 M* 4;6 6314C3 6314C3 25 - - - 23600 11800 5900 32200 16100 8050
225 MR* 26312 C3 6313 C3 25 13400 6700 3350 - - - - - -
250 M 2 ; 6 6314C3 6314C3 25 10400 5200 2600 - - - 32200 16100 8050
250 MR 4- - - 17800 8900 4450 - - -
280 S/M 2;4;6 6314C3 6316 C3 35 7200 3600 1800 21000 13230 6615 29000 29000 18270
315 S/M/L 26316 C3 6218 C3 35 7400 5880 2920 - - - - - -
315 S/M/L 4;6 6316 C3 6320 C3 50 - - - 15600 12400 6160 25000 25000 12500
355 L 26316 C3 6218 C3 35 7400 3700 1850 - - - - - -
355 L 4;6 6316 C3 6322 C3 60 - - - 13200 8316 4160 22000 13860 6930
355 LK 4;6 6324C3 6324C3 72 - - - 7500 3700 2800 20000 20000 10000
400 L/LV 4;6 6324C3 6324C3 72 - - - 7500 3700 2800 20000 20000 10000
400 LK/ 450 L 4;6 6328 C3 6328 C3 93 - - - 4600 2300 1100 10000 6000 3000
* bearing with grease nipple available to order
Series Type
No. of
poles
Type of bearing for
bearings with grease nipples
Quantity
of grease
Greasing intervals in hours
3000 rpm 1500 rpm
N.D.E. D.E. g25°C 40°C 55°C 25°C 40°C 55°C
PLS/PLSES
225 MG
2;4 6314C3 6317 C3 40 8000 4000 2000 19600 9800 4900
250 SF
250 MF
280 MD 2
280 SGU 4
6316 C3 6320 C3 50
- - - 15800 7900 3950
280 MGU 4
315 SUR 4
315 LUS 4
315 SU 29000 4500 2250 - - -
315 MU 2
315 L 26316 C3 6316 C3 35 9000 4500 2250 - - -
315 LD 26316 C3 6219 C3 35 8000 4000 2000 - - -
315 LG/MGU 26317 C3 6317 C3 35 6500 6500 4095 - - -
46317 C3 6322 C3 55 - - - 13200 13200 8316
315 VLG/VLGU 26317 C3 6317 C3 35 6500 6500 4095 - - -
46317 C3 6322 C3 55 - - - 13200 13200 8316
355 L 26317 C3 6317 C3 35 6500 6500 4095 - - -
4 6324C3 6324C3 72 - - - 7500 3700 2800
400 L 46328 C3 6328 C3 93 - - - 4600 2300 1100
* bearing with grease nipple available to order

20
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
PREVENTIVE MAINTENANCE
3.2 - Bearing maintenance
3.2.1 - Checking the bearings
As soon as you detect any of the following on the motor:
- Abnormal noise or vibration
- Abnormal temperature rise in the bearing even though it has
been lubricated correctly,
the condition of the bearings must be checked.
Damaged bearings must be replaced as soon as possible
to prevent worse damage to the motor and the equipment
being driven.
If one bearing needs to be replaced, the other bearing must
also be replaced.
The seals should be changed routinely when the bearings
are changed.
The free bearing must allow the rotor shaft to expand (check its
identication during dismantling).
3.2.2 - Reconditioning the bearings
Bearings without grease nipples
Dismantle the motor (see section 6.1); remove the old grease
and clean the bearings and accessories with degreasing
agent.
Fill with new grease: the correct amount of new grease for the
bearing is 50% of the free space.
Bearings with grease nipples
Always begin by cleaning the waste grease channel
If using the type of grease stated on the nameplate, remove the
covers and clean the grease nipple heads.
If a different grease from that on the nameplate is being used,
themotormustbedismantledandthebearingsandaccessories
cleaned with degreasing agent (carefully clean the grease inlet
and outlet pipes) to remove the old grease before relubrication.
To ensure correct lubrication, ll the inner free spaces of the
bearing retainers, anges and grease pipes and 30% of the
bearing free space.
Then rotate the motor shaft to distribute the grease.
Warning:
Too much grease causes the bearing to overheat (statistics
show that more bearings are damaged through too much
grease than too little grease).
Important note:
The new grease should be recently manufactured, of equivalent
performance and should not contain any impurities (dust,
water, etc).
4 - PREVENTIVE MAINTENANCE
Please consult LEROY-SOMER who, in its continuous search
for ways to help customers, has evaluated numerous methods
of preventive maintenance.
The diagram and table below give the recommended
equipmenttouse andtheideal positionstotake measurements
ofall parameters whichcan affectthe operationofthe machine,
such as eccentricity, vibration, state of bearings, structural
problems, electrical problems, etc.
M 01V M 02V
M 02
A
M 02HM 01H
1
3
4
2
5
Detector Measurement Measurement points
M 01V M 01H M 02V M 02H M 02A Shaft E01 E02 E03
Accelerometer For measuring vibrations •••••
Photo-electric cell For measuring speed and phase
(balancing) •
Clamp ammeter For measuring current
(D.C. and 3-phase) •••
Voltage probe For measuring voltage •••
Infra-red probe For measuring temperature • •