Leroy-Somer CPLS 160 Instruction Manual

CPLS
Drip-proof 3-phase induction motors
Installation and maintenance
4240 en – 05.2008 / a

LEROY-SOMER
INSTALLATION AND MAINTENANCE
Ref : 100080 Rev : 0
CPLS
Drip-proof 3-phase induction motors
1
IMPORTANT
These symbols appear in this document whenever it is important to take special precautions during
installation, operation, maintenance or servicing of the motors.
It is essential that electric motors are installed by experienced, qualified and authorised personnel.
In accordance with the main requirements of EEC Directives, the safety of people, animals and property should
be ensured when fitting the motors into machines.
Particular attention should be given to equipotential ground or earthing connections.
Before touching the motor, you must read the UTE C18-510 standard with regard to operator protection as
well as any current laws and regulations affecting the safety of personnel.
LEROY-SOMER cannot be held responsible for any problems arising from failure to comply with the instructions
in this manual.
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 (jammed transmission - loss of phase -
cut-out due to thermal protection - lack of lubrication, etc.)
Dear Customer,
You have just acquired a LEROY-SOMER motor.
This motor benefits 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 9000 - Edition 2000 international certificate.
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.
LEROY-SOMER
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 2005: LEROY-SOMER
This document is the property of 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
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Drip-proof 3-phase induction motors
2
SOMMAIRE
1 - RECEIPT............................................................................................................................................ 3
1.1 – M ARKING ...................................................................................................................................... 3
1.2 - S TORAGE ...................................................................................................................................... 4
2 - ASSEMBLY ....................................................................................................................................... 4
2.1 - C HECKING THE INSULATION ............................................................................................................ 4
2.2 - L OCATION ..................................................................................................................................... 5
2.3 - C OUPLING ..................................................................................................................................... 5
2.4 - E LECTRICAL GUIDELINES ................................................................................................................ 7
2.5 - M AIN CONNECTIONS ..................................................................................................................... 10
2.6 - S TARTUP ..................................................................................................................................... 12
3 - ROUTINE MAINTENANCE ............................................................................................................. 13
3.1 - C HECKING THE BEARINGS ............................................................................................................ 13
3.2 - G REASING ................................................................................................................................... 13
4 - PREVENTIVE MAINTENANCE....................................................................................................... 15
5 - TROUBLESHOOTING GUIDE ........................................................................................................ 16
6 - CORRECTIVE MAINTENANCE...................................................................................................... 17
6.1 - G ENERAL INFORMATION ............................................................................................................... 17
6.2 - D ISMANTLING THE MOTOR ............................................................................................................ 17
6.3 - B EFORE REASSEMBLING ............................................................................................................... 17
6.4 - R EASSEMBLY .............................................................................................................................. 18
6.5 - N OMENCLATURE .......................................................................................................................... 19
8 - INDEX............................................................................................................................................... 21

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Drip-proof 3-phase induction motors
3
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 – Marking
As soon as you receive the motor, check that the nameplate on the machine conforms to your order.
Nameplate example:
Definition of symbols used on nameplates:
Legal mark of conformity of product to the requirements of European Directives.
0710M01584: Motor serial number 07 : Year of production
10 : Week of production
M01584 : Manufacturing order
Mot.3~ : Three-phase A.C. motor
CPLS : Series
112 : Frame size
L: Housing symbol
Kg : Weight
IP23 : Index of protection
cl. F : Insulation class F
40°C : Maximum ambient
temperature for operation
(IEC 60034-1)
S: Duty
V: Supply voltage
Hz : Supply frequency
Min-1 : Revolutions per minute (rpm)
kW : Rated output power
Cos φ: Power factor
A: Rated current
Bearings
DE : Drive end
NDE : Non drive end
g* : Quantity of grease
at each regreasing (in g)
h* : Greasing interval (in hours)
*Permanently greased bearings if not informed

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Drip-proof 3-phase induction motors
4
1.2 - Storage
Prior to commissioning, machines should be stored:
- Away from humidity: for relative humidity greater
than 90% the machine insulation can drop very
quickly and become virtually non-existent at around
100%; check the anti-rust protection on unpainted
parts.
For very long storage periods the motor can be
placed in a sealed package (for example heat-
shrunk plastic) containing sachets of desiccant.
- Protected from frequent significant temperature
variations to prevent any condensation during
storage.
- 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.
Even if the motor has been stored in the correct
conditions, some checks must be carried out before
it is started up
Greasing
Bearings that cannot be regreased
Maximum storage: 3 years. After this time, replace
the bearings (see section 6.1).
Bearings that can be regreased
Greases used by LEROY-SOMER
CPLS motors are lubricated with EXXON UNIREX
N3 grease used as standard. (Grade 3) .
2 - ASSEMBLY
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 500 V DC (do not use a magneto-
electric 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).
- 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 22kW).
- 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 orifices must be open
(terminal box)
Warning: If the high voltage test, carried out
at the factory before despatch, needs to be repeated, it
should be performed at half the standard voltage.
ie: 1/2 (2U+1000V).
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.
Before testing at no load and without
coupling, secure the key!

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Drip-proof 3-phase induction motors
5
2.2 - Location
All motors of the CPLS range are IP23. The motor
will have to be installed under shelters not to be
exposed to bad weather.
As standard, the cooling method of these motors is
IC06. It means that the cooling fluid is taken from
the ambient fluid (air) and rejected in the same way.
This fluid circulates thanks to a system independent
of the speed of the motor.
It is therefore necessary to respect following
recommendations:
The motor must be installed in a ventilated place,
with clearance for the air inlet and outlet.
Obstruction (clogging) - even accidental - of the
ventilation circuit has an adverse effect on motor
operation.
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 expulsion of hot air, in
order to prevent abnormal motor temperature rise.
Except contrary mention on the order, the motor is
dimensioned for an environment standardized
according to EN 60034-1so as:
- altitude : 1000 m or less.
- Temperature between +5 and +40°C.
Ensure there is easy access to the terminal box and
interventions gates.
Positioning
The motor must be mounted in the position
specified on the order, on a base which is rigid
enough to prevent distortion and vibration.
The seals should be able to withstand the forces
engaged during normal motor operation, as well as
a possible over-torque of 2 times the rated torque.
For the CPLS motor range, standard
mounting positions are B3 and B35.
Consult the plant for any other mounting
position.
Motor is fitted with lifting rings
mounted diagonally on each
flanges. They are designed
to lift the motor only and must
not be used to lift the motor
mounted on the driven
equipment.
If it is necessary, use a lifting
bar system to protect both
ventilation and accessories.
Note: 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.
Moving the motor
For made-to-order motors with roller bearings, in
exceptional circumstances when the motor has to
be moved
after the coupling device has been fitted,
the rotor must be immobilised.

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Drip-proof 3-phase induction motors
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Balancing
Rotating machines are balanced in accordance with
standard ISO 8821:
- Half-key when the shaft extension is marked H:
standard
- No key when the shaft extension is marked N
- Full key when the shaft extension is marked F
Thus any coupling element (pulley, coupling sleeve,
slipring,etc...) must 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 fixed firmly 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).
Beware of back driving when the motor is
switched off. The appropriate precautions must
be taken:
- On pumps: install a non-return valve.
- On 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 grease the tapped hole of the
shaft extension with a special lubricant (e.g.
molykote grease) to make it easier to fit the
coupling.
The hub of the transmission device must be:
- Fully in contact with the shoulder of the shaft.
- 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).
If there is a second shaft extension, it must only be
used for direct coupling and the same
recommendations must be followed.
Warning: If the 2nd shaft extension is
smaller than the main one, do not exceed half
the rated torque.
Inertia flywheels must not be mounted directly onto
the shaft extension, but installed between end
shields and connected by a coupling sleeve.
Direct connection onto the machine
When mounted directly on the motor shaft extension
of the moving device (pump or fan turbine), check
that this device is perfectly balanced and that the
radial force or the axial thrust are within the limits
indicated in CPLS technical catalogue.
Direct connection using a coupling sleeve
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 coupling halves should be provisionally
assembled to assist moving them in relation to one
another.
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
coupling
To perfect this adjustment and at the same time
check the concentricity of the two shafts, mount 2
gauges, as shown in the diagram, and slowly turn
both shafts.

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Drip-proof 3-phase induction motors
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The deviations registered by either shaft will indicate
the need for either an axial or radial adjustment if
the deviation exceeds 0.05 mm.
Direct connection using a rigid coupling sleeve
Both shafts must be aligned so as to adhere to the
tolerances of the coupling sleeve manufacturer.
Maintain the minimum distance between the shaft
extensions to allow for expansion of the motor shaft.
If this is not possible, consult LEROY-SOMER.
Transmission via belt pulleys
The user can choose the diameter of the pulleys.
Cast iron pulleys with a diameter over 315 are not
recommended for rotation speeds of 3000 rpm and
more.
Flat belts cannot be used for rotation speeds of
3000 rpm and 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 fitting the belts.
For notched belts, position the notches in the pulley
grooves.
Aligning the pulleys
Check that the motor shaft is completely parallel
and aligned with that of the receiving pulley.
Adjusting the tension of the belts
Adjusting the tension of the belts must be carried
out very carefully in line with the recommendations
of the belt supplier.
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.
- Tension too weak = vibration (wearing of the
bearing unit).
2.4 - Electrical guidelines
Electric motors are industrial products. They
must therefore be installed by qualified and
experienced personnel.
The safety of people, animals and property must
be ensured when fitting or building the motors
into a machine: please refer to current
standards.
CPLS motors range is designed to be inverter fed.
For an optimum and safe functioning, respect the
starting-up and protection procedures described in
the inverter user guide.
Earthing
It is essential to earth the motor in order to protect
workers.
Conform to the current standards and legislation
when connecting the earth wires.
Built-in thermal protection
The motors can be equipped with optional heat
sensors; these sensors can be used to monitor
temperature rises at "hot spots" in order to detect an
overload or faulty cooling (or at strategic points) and
thus safeguard the installation.
It must be emphasized that these sensors cannot be
used to carry out direct adjustments to the motor
operating cycle
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.
Φ(mm) A (mm)
< 55 1
60 1.5
65 1.5
75 2
80 2

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Drip-proof 3-phase induction motors
8
- NRT: nominal running temperature
- The NRTs are chosen according to the position of the sensor in the motor and the temperature rise class.
- PTO or PTF, in the control circuits
- PTC, with relay, in the control circuits
- PT 100 or Thermocouples, with reading equipment or recorder, in the control board of the installation for
continuous surveillance.
Alarm and Safety
All protective equipment may be backed up by another type of protection (with a different NRT). The first device
will then act as an alarm (light or sound signals given without shutting down the power circuits), and the second
device will be the safety system (shutting down the power circuits).
Protection against condensation: Space heaters
Identification: 1 red label
A glass fibre flexible resistor is fixed 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 specified by the customer.

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Drip-proof 3-phase induction motors
9
3-phase forced ventilation wiring
The forced ventilation motor must be earthed. The earth terminal is inside the terminal box.
It is indicated by the symbol:
Encoder wiring
When using incremental encoders in industrial
environments containing high-current installations or
electronic speed control systems, certain well-
known basic rules must be observed. Equipment
must be connected by qualified personnel.
Basic rules
Use shielded cables. For links greater than 10
metres in length, use cables with several shielded
twisted pairs reinforced with external shielding. We
recommend the use of conductors with a minimum
standard cross-section of 0.14 mm 2 (recommended
cable type: LIYCY 0.14 mm²)
Separate the encoder connection cables as far as
possible from any power cables and avoid parallel
routing.
Distribute and connect the 0 V and the shielding of
cables in star.
Earth the shielding using cables with a minimum
cross-section of 4 mm².
Never connect a shielding to the ground at its 2
ends.
Ideally a shielded cable should be earthed at the
“user” end for the encoder signals (cubicle, PLC,
counter).
Check the continuity of the shielding when using
connectors or connection boxes.
Precaution during connection
Switch off the power supply before performing any
connection operation (connection or disconnection,
with or without connectors) at the encoder or cubicle
end.
For reasons of synchronisation, power up and
power down the encoders and any associated
electronic devices simultaneously.
On the first power-up, check that the “supply +”
terminal is supplying the required voltage before
connection.
Use stabilised power supply sources. Power
supplies via transformers providing 5 V (or 24 V)
rms, followed by rectifiers and filter capacitors,
MUST NOT BE USED, as in reality the resulting DC
voltages are:
For 5V: 5 × √2 = 7.07 V
For 24V: 24 × √2 = 33.94 V

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Drip-proof 3-phase induction motors
10
2.5 - Main connections.
This section is valid only for the CPLS motors without the CPS system (optional). For motors
equipped with this system, please refer to the specific ‘system CPS’ user guide.
Terminal box
Placed as standard (A) on the top of the motor near the drive end,
the terminal box is made up of IP 55 components and is fitted with
a cable gland in accordance with the table below.
If required, the terminal box may be fitted in a different position
(On the left or right as seen from the drive end).
Terminal box positions
Cable gland
The standard position of the cable gland is on the right, seen from the drive end except
particular request on the order.
Check that the cable entry radius of curvature prevents water from entering the cable
gland.
The standard cable glands are plastic. On request, they can be of brass, or of marine
type
Cable gland position
Adapt the cable gland and its reducer if present to the diameter of the cable being used.
In order to preserve the motor terminal box'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.
Gland table for the CPLS motors range:
Tightening capability
Gland type Cable min. Dia. (mm) Cable Max. Dia. (mm)
ISO 16 (accessories) 5 10
ISO 20 9.5 15
ISO 25 13 19
ISO 32 15 25
ISO 40 21 32
ISO 50 26 38
ISO 63 31 44

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Drip-proof 3-phase induction motors
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Cross-section of the power supply cables
The voltage drop in cables (standard NFC 15.100) will be much more important than the current will be high. The
voltage drop should therefore be calculated for the starting current to see if this is suitable for the application
The chart below can be used to select the conductors according 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.

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Drip-proof 3-phase induction motors
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Connections for a block of 6 terminals.
The motors are fitted with a block of 6 terminals
complying with standard NFC 51 120, with the
terminal markings complying with EN60034 - 8 (or
NFC 51 118).
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.
If the motor is fitted with accessories (thermal
protection or space heater), these should be
connected on screw dominos or terminal blocks with
labelled wires (see section 2.4).
Earth terminal:
Inside the terminal box:
- Shaft height ≤132 mm
It is made of a stub, inside the terminal box.
- Shaft height ≥160 mm
It is located on a boss inside the terminal box.
It is indicated by the symbol:
On the flange, side of the terminal box:
It is made of a labelled thread on the flange.
The motor must be earthed, and conform
to current regulations (protection of people).
Mains connection
The cables must be fitted 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 diagrams below):
Tightening torque (Nm) on the terminal block
nuts:
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.
2.6 - Startup
The engine is designed to function at the speeds,
which are reproduced on the nameplate
- Do not exceed the maximum mechanical speed
indicated in the CPLS technical catalogue.
- Respect voltage and frequency indicated on the
nameplate. Do not deviate from ±5% of the
extremes plated voltages and ±1% of frequency).
M6 M8 M10 M12 M14
Steel
terminals 5 10 20 35 50

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Drip-proof 3-phase induction motors
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3 - ROUTINE MAINTENANCE
Checks after start-up
After approximately 50 hours operation, check that
the screws fixing the motor and the coupling device
are still tight.
In the case of chain or belt transmission, check that
the voltage is correctly adjusted.
Ventilation
To ensure correct motor operation, take steps to
prevent dust and foreign bodies from clogging
forced ventilation and DE shield louvers.
For forced ventilations equipped with standard or
vinyl filters (optional in both cases), it is necessary
to clean the filter periodically (having disassembled
it), with compressed air, according to the pollution of
ambient air. If the clogging of the filter is too
important, replace it.
Cleaning
Dry cleaning (vacuuming or compressed air) is
recommended. Cleaning must always be carried out
at low pressure to avoid dust and particles getting
under the seals.
Precaution: check that the motor is totally sealed
(terminal box, etc) before carrying out any cleaning
operation.
Wet cleaning (water hose or high pressure
cleaner) is to be avoided.
3.1 - Checking the bearings
As soon as you detect any of the following on the
motor:
- A noise or abnormal vibration
- Abnormal heating of the bearing when it is
correctly greased, the state 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.
When 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 drive end shield (D.E.) bearing must be freely
mounted to allow for expansion of the rotor shaft.
3.2 - Greasing
As standard, all motors of the CPLS range are
equipped with sealed bearings (Shields without
grease nipple).
For specific applications, such as high speeds or
heavy loads, motors can be equipped with open ball
bearings or cylindrical roller bearings. In this case
the shields are fitted with grease nipples Tecalemit-
Hydraulic M8 x 125.
As standard, the bearings are lubricated with
EXXON UNIREX N3 grease, and we recommend
that it is used for subsequent lubrication. Avoid
mixing greases.
-The interval of time between two successive
regreasings can depend of additional parameters
like ambient temperature or type of grease (if not
EXXON UNIREX N3)
The lubrication intervals, quantity and
quality of grease, are indicated on the motor
nameplate.
Even in the event of prolonged storage or
downtime, the interval between 2 greasing
operations should never exceed 2 years.
Regreasing
Always begin by cleaning the waste grease
channel.
When using the grease shown on the nameplate,
remove the covers and clean the grease nipple
heads.
Efficient greasing only really occurs with the motor
running, which ensures that the new grease is well
distributed in the bearing.
If greasing cannot be carried out with the motor
running (mainly for safety reasons):
- Stop the motor
- Inject only half the amount of grease shown on the
nameplate
- Turn the motor for a few minutes
- Add more grease until the quantity indicated is
reached.
Note: When using a different type of grease to that
indicated but of similar quality, the motor must be
dismantled and the bearings and accessories
cleaned (carefully clean the grease inlet and outlet
channels) to remove the old grease before
regreasing. Then proceed as indicated in paragraph
6 (corrective maintenance).
Too much grease causes the bearing to
overheat (statistics show that more bearings are
damaged through too much grease than too
little grease).
The new grease must be recently
manufactured and must not contain any
impurities (dust, water, etc).

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Drip-proof 3-phase induction motors
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End shields with lifetime greased bearings
The grease lifetime depend of:
- Its characteristics (soap nature, basic oils, etc)
- Operational parameters: rotation speed (rpm), ambient
temperature)
- Pollution factor
The configuration and the size of these bearings allow an important lifetime
for grease and machines.
Opposite diagrams gives lifetime, according to the rotation speed of motor
and ambient temperature.
Lifetime L
10h
( 000’s of hours )
End shields with grease nipples:
Regreasing intervals (ball bearings*) in hours according with rotation speed:
(For a horizontal shaft)
Rotation speed lower or equal to
CPLS Motor
Frame size 1000 rpm 1500 rpm 2000 rpm 3000 rpm
Quantity of
grease to be
topped up (g)
112 22000 20000 15000 12000 11
132 20000 17000 12000 8000 15
160 18000 13000 10000 6000 20
200 12000 6800 5200 2000 40
*: for rolling bearings divide the values by 2.
These intervals of regreasing are valid for EXXON UNIREX N3 grease and an end shields temperature of 90°C.
If the end shields temperature is different, multiply data by correction factor Kt, given on diagram:
For a vertical shaft machine, the regreasing interval must be reduced by 20% compared with given values.

LEROY-SOMER
INSTALLATION AND MAINTENANCE
Ref : 100080 Rev : 0
CPLS
Drip-proof 3-phase induction motors
15
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 equipment to use and the ideal positions to take measurements
of all parameters which can affect the operation of the machine, such as eccentricity, vibration, state of bearings,
structural problems, electrical problems, etc.

LEROY-SOMER
INSTALLATION AND MAINTENANCE
Ref : 100080 Rev : 0
CPLS
Drip-proof 3-phase induction motors
16
5 - TROUBLESHOOTING GUIDE
Incident Possible cause
Remedy
Abnormal noise
Originating in motor or machine being driven?
Uncouple the motor from the equipment being
driven and test the motor on its own
Noisy motor
Mechanical cause: if the noise persists
after switching off the power supply
- Vibrations Check that the key conforms to the type of
balancing (see section 2.3)
- Damaged bearings
- Change the bearings
- Mechanical friction
- Check: ventilation, coupling
Electrical cause: if the noise stops after
switching off the power supply
- Check the power supply at the motor
terminals
- Normal voltage and 3 phases balanced
-
Check the connection of the terminal block
and the tightening of the connectors
- Abnormal voltage
- See inverter documentation
- Unbalanced phase
- Check the winding resistance
Motor heats up abnormally
- Faulty ventilation
- Check the environment
- Cleaning ventilation louvers (filters)
- Check electric connections of forced
ventilation motor.
If necessary, check heat sensors operation
(optional)
- Faulty supply voltage
- Check
- Overload
- Check the current consumption against the
one indicated on the motor nameplate
- Partial short-circuit
- Check the electrical continuity of the
windings and/or the installation
- Unbalanced phase
- Check the winding resistance
Motor does not start
At no load :
- Mechanical locking
- Broken power supply line
When switched off:
- Check that the shaft rotates freely by hand
- Check the fuses, electrical and thermal
protection, starting device.
On load
- Unbalanced phase
When switched off:
- Check the direction of rotation (phase order)
- Check the resistance and continuity of the
windings
- Check the electrical protection .

LEROY-SOMER
INSTALLATION AND MAINTENANCE
Ref : 100080 Rev : 0
CPLS
Drip-proof 3-phase induction motors
17
6 - CORRECTIVE MAINTENANCE
6.1 - General information
First switch off and lock the power supply.
Open the terminal box; identify the wires and their
position.
- Disconnect the power supply wires.
- Uncouple the motor from the driven device.
Always use an extractor to remove devices mounted
on the shaft end of the motor.
6.2 - Dismantling the motor
It is advisable to mark the shields in relation to the
stator.
- Label the cables and connections in the terminal
box.
- Disconnect them.
- Remove the encoder: unplug the connector and
unlock the encoder driving ring.
- Slide out the encoder.
- Remove the 4 screws retaining the forced ventilation
(11) and remove it.
- Open the terminal box (10).
- Remove the terminal block (7).
- Remove the terminal box (8) and then the terminal
box plate (6). (It will make the reassembly easier)
- Unscrew the 4 nuts retaining the shields (5) and (13).
- Remove the 4 screws of the front and/or rear bearing
inner flange if any.
- Using a bronze drift, remove the shields (5) and (13)
by tapping gently on it. (During this operation, support
the shields with a lifting system)
- Recover the preloading washer and/or set ring(s).
Beware that their position is different at the front and
at the rear. Note their position.
- Remove circlips and/or bearings set ring (on the
shaft) if any.
- Take the rotor out of the stator (1) taking care not to
damage the winding.
- Remove the shaft key.
- Take out the bearings (3) and (15) using a bearing
remover, while protecting the shaft end with a washer.
Take care not to knock the running surfaces of the
shaft.
6.3 - Before reassembling
Stator:
- Any dust must be removed from the stator: if the
winding needs to be cleaned, a suitable liquid must be
used: dielectric and inert on the insulation and the
external finish.
- Check the insulation (see section 2.1) and if
necessary, dry it out.
- Clean the spigots thoroughly, and remove all traces
of impact on the mating surfaces if necessary.
Rotor:
- Clean and check the bearing running surfaces. If
there is any damage, renew the running surfaces or
change the rotor.
- Check the condition of the threads, keys and their
housing.
Shields, bearing cases:
- Clean off any traces of dirt (old grease, accumulated
dust, etc).
- Clean the bearing housings and the spigot.
- If necessary, apply anti-flash varnish inside the end
shields.
- Clean the grease caps and the grease valves
carefully.
Mounting the bearings on the shaft
The reference numbers for the bearings to be used
are indicated on the motor nameplate.
This operation is extremely important, as the slightest
indentation of a ball on the bearing tracks would cause
noise and vibration.
Lightly lubricate the running surfaces of the shaft.
There are several ways of mounting the bearings
correctly:
- Cold state: The bearings must be mounted without
any impact, using a spanner (do not use a hammer).
The force applied must not be transferred to the
bearing track. You should therefore use the internal

LEROY-SOMER
INSTALLATION AND MAINTENANCE
Ref : 100080 Rev : 0
CPLS
Drip-proof 3-phase induction motors
18
cage for support (taking care not to press on the seal
shield for dust and damp protected bearings).
- Hot state: Heat the bearing to between 80 and 100°C
in a dryer, an oven or on a heating plate.
(A blowtorch must never be used for heating, just as
an oil bath must not be used for heating permanently
greased bearings).
6.4 - Reassembly
Be careful to put the stator in its original position
to keep shields centred and aligned with the stack
of laminations.
While reassembling always ensure that seals are well
positioned. Do not hesitate to replace them if needed.
- See § 6.1 before reassembling.
- If necessary, insert the inner bearing flanges and set
ring(s) on the shaft.
- Screw a rod tie into one of the bearing flange(s)
threads to ensure the angular position of the flange
while mounting the shields.
- Mount new bearings on the shaft; see section 6.1
mounting bearings.
- Mount circlip(s).
- Insert the rotor into the stator (1) taking care not to
damage the winding.
- If the motor has tie rods, insert them through the
stator.
- Insert the preload washer with some grease in the
bearing case of the DE shield (5). Do not forget set
ring(s) (if any), and position the shield on the stator (1)
with a lifting system
- Get all connections cables (stator and eventually
accessories) through DE shield.
- Position the NDE shield (13) on his rod/stud without
forgetting the set ring(s), if any.
- Slightly tighten the nuts to maintain the shields in
position.
- Check out angular alignment of each shield with
stator. (An angular defect could affect the free rotation
of the rotor once mounted on its base).
- Tighten diagonally the shields fixing nuts up to the
indicated torque (See next §). The lifting equipment
can be removed.
- Tighten the bearing flange(s) screws, if any.
- Check that the rotor turns freely by hand (that there
is no axial play if there is a locked end shield).
- Mount the terminal box plate (6).
- Mount the terminal box (8).
- Mount the terminal block (7).
- Plug the stator connection cables. The tightening
torque of the nuts is given § 2.5.
- Mount the forced ventilation (11)
- Mount the encoder and check the run-out of the
encoder shaft end. It must be lower than 0.03mm. (A
greater value could damage the encoder quickly.)
- Insert the shaft end key.
Tightening the tie rods/studs
They must be tightened diagonally, to the torque
indicated (see below).
ΦT
min
(Nm) T
max
(Nm)
CPLS 112 M6 5 6
CPLS 132 M8 15 20
CPLS 160 M10 30 35
CPLS 200 M12 55 60
Before starting-up the motor:
- Grease the bearings, if needed.
It is advisable to test the motor at no load
- If necessary, repaint the motor.
- Mount the transmission device on the motor shaft
extension and reinstall the motor on the machine to be
driven.
- Reconnect all the power supply wires in accordance
with the diagram or markings made before
dismantling.

LEROY-SOMER
INSTALLATION AND MAINTENANCE
Ref : 100080 Rev : 0
CPLS
Drip-proof 3-phase induction motors
19
6.5 - Nomenclature
N° Pièce
01 Stator
02 Inner DE flange bearing retainer
(If any)
03 Drive end bearing
04 Ventilation louver
05 Drive end shield (DE)
06 Terminal box plate
07 Terminal block
08 Terminal box
09 Terminal box seal
10 Terminal box lid
11 Forced ventilation
12 Forced ventilation plate
13 Non drive end shield (NDE)
14 Maintenance door
15 Non drive end bearing