Grundfos MMG-H IE4 User manual

MMG-H IE4
50 Hz
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

MMG-H IE4
English (GB)
Installation and operating instructions ..................................4
3
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 4
1.1 Hazard statements .............. 4
1.2 Notes ..................... 4
2. Product introduction ............ 5
2.1 Product description .............. 5
2.2 Standards and specifications ......... 5
3. General safety warnings .......... 7
4. Receiving the product............ 7
5. Mechanical installation ........... 8
5.1 Lifting the product ............... 8
5.2 Assembling the connecting device ...... 8
5.3 Direct connection ............... 8
5.4 Connection by means of pulley........ 8
5.5 Connecting to the power supply ....... 8
5.6 Connection of auxiliary parts ......... 8
5.7 Fixing to the base ............... 9
6. Electrical connection ............10
6.1 Wiring diagrams................10
7. Startup ....................11
7.1 Initial controls .................11
7.2 Control of design data ............11
7.3 Starting ....................12
7.4 Conditions of use ...............12
8. Service ....................13
8.1 Checking ...................13
8.2 Lubrication ..................13
8.3 Dismantling and reassembling ........14
8.4 Bearing replacement .............14
8.5 Repairs and overhauls ............15
9. Storage ....................15
9.1 Storage conditions ..............15
9.2 Checking the bearings ............15
9.3 Checking the insulation ............15
10. Fault finding the product ..........16
10.1 The motor does not start ...........16
10.2 The motor does not reach its nominal
speed or the acceleration times are too
long and/or absorption excessive ......16
10.3 The motor overheats when working under
load ......................16
10.4 Incorrect rotation ...............17
10.5 Functioning of the protective device .....17
10.6 Abnormal vibrations..............17
10.7 Irregular noise.................18
10.8 Bearings overheating .............18
11. Disposing of the product ..........18
1. General information
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
DANGER
Indicates a hazardous situation which, if
not avoided, will result in death or serious
personal injury.
WARNING
Indicates a hazardous situation which, if
not avoided, could result in death or
serious personal injury.
CAUTION
Indicates a hazardous situation which, if
not avoided, could result in minor or
moderate personal injury.
The hazard statements are structured in the following
way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
Observe these instructions for explosion-
proof products.
A blue or grey circle with a white graphical
symbol indicates that an action must be
taken.
4
English (GB)

A red or grey circle with a diagonal bar,
possibly with a black graphical symbol,
indicates that an action must not be taken
or must be stopped.
If these instructions are not observed, it
may result in malfunction or damage to the
equipment.
Tips and advice that make the work easier.
2. Product introduction
2.1 Product description
The electrical machines mentioned in these
instructions are intended as components for use in
industrial areas. The information contained in this
documentation is designed for use by qualified
persons who are familiar with the current rules and
regulations in force. They are not intended to replace
any installation regulations issued for safety
purposes. Low voltage motors are to be considered
as components to be installed on machines.
Commissioning is forbidden until the final product has
been checked for conformity.
This manual applies to all the standard series of
MMG-H and various series of motors derived from it.
Frame size: 56-355. (For some special designed
types of motors or those for special applications, it
needs to refer to other special instructions.)
2.1.1 Electromagnetic compatibility
Low voltage induction motors, if installed correctly
and connected to the power supply, respect all
immunity and emission limits as set out in the
regulations relating to electromagnetic compatibility
(EMC generic standard for industrial environments).
In the case of supply by means of electronic impulse
(inverters, soft starters, etc.), all verifications and any
modifications necessary to ensure that emission and
immunity limits stated within the regulations are
respected, are the responsibility of the installer.
2.1.2 Motors for classified areas
Motors to be used in dangerous areas are designed
in compliance with European standards, using
protection methods that are suitable for guaranteeing
safety in areas subject to risk of fire and explosion.
Where these motors are used improperly or modified,
their safety may be impaired.
2.2 Standards and specifications
Title
Internationa
l
IEC
EU
CENELEC
I
CEI-EN
GB
BS
F
NFC
D
DIN/VDE
Electrical rotating
machines/rated
operation and
characteristic data
IEC 60034-1 EN 60034-1
CEI-EN
60034-1 (CEI
2-3)
BS 4999-1
BS 4999-69
NFC51-100
NFC 51-111 VDE 0530-1
Methods for
determining losses
and efficiency of
rotating electrical
machinery
IEC 60034-2 EN 60034-2
CEI-EN
60034-2 (CEI
2-6)
BS 4999-34 NFC 51-112 VDE 0530-2
Protection types of
rotating electrical
machines
IEC 60034-5 EN 60034-5
CEI-EN
60034-5 (CEI
2-16)
BS 4999-20 NFC 51-115 VDE 0530-5
Cooling methods of
rotating electrical
machines
IEC 60034-6 EN 60034-6
CEI-EN
60034-6 (CEI
2-7)
BS 4999-21 IEC 34-6 DIN IEC 34-6
Construction types
of rotating electrical
machines
IEC 60034-7 EN 60034-7
CEI-EN
60034-7 (CEI
2-14)
BS 4999-22 NFC 51-117 DIN IEC 34-7
5
English (GB)

Title
Internationa
l
IEC
EU
CENELEC
I
CEI-EN
GB
BS
F
NFC
D
DIN/VDE
Terminal markings
and direction of
rotation for electrical
machines
IEC 60034-8 EN 60034-8 CEI 2-8 BS 4999-3 NFC 51-118 VDE 0530-8
Noise emission, limit
values IEC 60034-9 EN 60034-9
CEI-EN
50034-9 (CEI
2-24)
BS 4999-51 NFC 51-119 VDE 0530-9
Start-up behaviour of
squirrel-cage motors
at 50 Hz up to 660 V
IEC
60034-12 EN 60034-12
CEI-EN
60034-12
(CEI 2-15)
BS 4999-112 IEC 34-12 VDE 0530-12
Vibration severity of
rotating electrical
machines
IEC
60034-14 EN 60034-14
CEI EN
60034-14
(CEI 2-23)
BS 4999-50 NFC 51-111 DIN ISO
2373
Fixing dimensions
and output for IM B3 IEC 60072 EN 50347 IEC 60072 BS 4999-10 NFC 51- 104/110 DIN 42673
Fixing dimensions
and output for IM B5,
IM B14
IEC 60072 EN 50347 IEC 60072 BS 4999-10 NFC 51-
104/110 DIN 42677
Cylindrical shaft
ends for electrical
machines
IEC 60072 EN 50347 IEC 60072 BS 4999-10 NFC 51-111 DIN 748-3
Electrical equipment
for hazardous area
General Provisions
IEC 60079-0 EN 60079-0 (CEI 31-8) BS 5501-1 NFC 23-514 VDE 0171-1
Electrical equipment
for hazardous area
Flame-proof
enclosure "d"
IEC 60079-1 EN 60079-1 (CEI 31-1) BS 5501-5 NFC 23-518 VDE 0171-5
Electrical equipment
for hazardous area
Increased safety "e"
IEC 60079-7 EN 60079-7 (CEI 31-7) BS 5501-6 NFC 23-519 VDE 0171-6
Checking and
maintenance at
electrical systems in
places in danger of
explosion due to the
presence of gas
IEC
60079-17 EN 60079-17 CEI EN 60079-17 --- --- ---
Electrical systems in
places in danger of
explosion due to the
presence of gas
IEC
60079-14
IEC
60079-14
IEC
60079-14 --- --- ---
6
English (GB)

Title
Internationa
l
IEC
EU
CENELEC
I
CEI-EN
GB
BS
F
NFC
D
DIN/VDE
Classification of
dangerous places
due of the presence
of gas
IEC
60079-10 EN 60079-10 CEI EN 60079-10 --- --- ---
Checking and
maintenance of
electrical systems in
places in danger of
explosion due to the
presence of dust
IEC
61241-17 EN 61241-17 CEI EN 61241- 17 --- --- ---
Electrical systems in
places in danger of
explosion due to the
presence of dust
IEC
61241-14 EN 61241-14 CEI EN 61241- 14 --- --- ---
Classification of
dangerous places
due of the presence
of dust
IEC
61241-10 EN 61241-10 CEI EN 61241- 10 --- --- ---
3. General safety warnings
WARNING
Rotating parts
Death or serious personal injury
‐Improper use, removal and
disconnection of protection devices,
and lack of inspection and
maintenance can cause death or
serious personal injury.
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product.
WARNING
Hot surface
Death or serious personal injury
‐In normal working conditions, the
temperature of the motor exceeds 50
°C. Use personal protective equipment
when working on the product.
The safety manager must ensure and guarantee that:
• the machine is moved, installed, put into service,
inspected, maintained and repaired only by
qualified persons who should have:
- specific technical training and experience
- knowledge of technical standards and
applicable laws
- knowledge of general safety regulations as
well as national, local and installation
regulations
- ability to recognise and avoid all possible
dangers.
Work on the electric machine should be carried out
with the authorisation of the safety manager after
having ensured the following:
• The motor has been disconnected from the power
supply and no parts of the motor, including
auxiliary parts, are active.
• The capacitor of single-phase motors has been
discharged.
• The motor is completely stopped and there is no
danger of accidental restart.
• The right precautions against faulty braking
operations have been taken for self-braking
motors.
Where thermal protection with automatic reset is
used, care must be taken to ensure that automatic
restart cannot occur. As the motor is intended to be
used in industrial areas where more stringent
protective measures are needed, additional protective
measures must be taken and guaranteed by the
person responsible for the installation.
4. Receiving the product
The motors are shipped ready for installation. Upon
receipt, remove packaging and turn the shaft to check
the motor has not been damaged, also check all
physical aspects of the machine for damage. In the
case where the machine is damaged, an immediate
notification must be given in writing by the storeman
and the representative of the carrier to Grundfos
within three days.
7
English (GB)

5. Mechanical installation
Work on the electric machine must be
carried out when the machine has stopped
and been disconnected from the power
supply (including auxiliary parts, such as
anticondensation heaters).
5.1 Lifting the product
Before using the lifting rings, make sure
they have been tightened.
The lifting rings are big enough to bear the
weight of a single motor, therefore they
must not be used to lift the equipment
connected to the motor.
In environments where the temperature is
below -20 °C, these lifting rings should be
used with caution as they could break at
low temperatures and cause damage.
5.2 Assembling the connecting device
Fitting pulley, coupling or gear to the motor
shaft must be carried out with care to
ensure no damage is caused to the
bearing.
Fitments not balanced properly can cause
anomalous vibrations during operation that
jeopardizes the proper working of the
motor and drastically reduces its life.
1. Remove the protective paint finish from the shaft
and smear with oil.
2. Fit the device, heating before fitting, if possible, to
ensure an easy fit.
Any component that is assembled on the motor shaft
must be accurately balanced. The motor is normally
balanced using a half key and the letter H is punched
on the shaft.
5.3 Direct connection
Use couplings that have been made and balanced
perfectly to align the motor shaft and the operating
machine precisely.
Inaccurate alignment may cause vibrations
and damage to the bearings or breakage
of the shaft end.
5.4 Connection by means of pulley
Check that alignment with the pulley of the operating
machine has been carried out perfectly. The tension
of the belts must be enough to avoid slipping.
Excessive tension of the belts causes harmful radial
loads on the motor shaft and bearings, reducing their
life.
Excessive tension of the belts causes
harmful radial loads on the motor shaft and
bearings, reducing their life.
We recommend assembling the motor on
belt-tensioning slides in order to accurately
adjust the tension of the belts.
A connection with belts must be such as to avoid
accumulation of static charges in the moving belts
which could cause sparks.
5.5 Connecting to the power supply
Use cables with sufficient section to bear
the maximum current absorbed by the
motor, avoiding overheating and/or drops
in voltage.
Connections to the terminals must be
made in order to guarantee safe distances
between live uncovered parts.
Earthing is through the screw located
inside the terminal box. Earths must be of
sufficient size and installed according to
relevant standards. The area of contact of
connections must be cleaned and
protected against corrosion.
When the cable inlet is made by means of
a cable gland, it must be chosen properly
in relation to the type of equipment and
type of cable used. The cable gland must
be tightened so that the retaining rings
create the pressure necessary to:
• prevent transmission of mechanical
stress to the motor terminals
• ensure the mechanical (IP degree)
protection of the terminal box.
1. Connect the cables to terminals by following the
instructions on the nameplate or on the diagram
included in the terminal box.
2. Make sure that the terminal nuts are tightened.
5.6 Connection of auxiliary parts
Thermal protection
Check which type of protection is installed before
making connections. If thermistors (PTC) are used, it
is necessary to utilise a suitable relay.
8
English (GB)

Do not apply a tension over 6 V during the
thermistor continuity test.
Anticondensation
If the motor is fitted with anticondensation heaters,
their power supply must be separated from that of the
motor, using the terminals housed in the terminal box.
The supply of the heater is always mono-
phase and the voltage is different from that
of the motor. Check that it corresponds to
the one indicated on the nameplate.
Auxiliary ventilation
Connect the supply of the auxiliary ventilation motor
separately from that of the main motor.
Use a device that allows starting and
operation of the main motor only when the
auxiliary fan is working.
5.7 Fixing to the base
The bolts fixing the motor to the base must be fitted
with washers to ensure adequate load distribution.
9
English (GB)

6. Electrical connection
6.1 Wiring diagrams
Connection for single-speed motors
U1
W1 V1
W2
U1 V1 W1
L1 L2 L3
U2 V2
TM079951
Y-connection
U1
W1 V1
W2
U1 V1 W1
L1 L2 L3
U2 V2
TM079952
D-connection
Number of poles: 2, 4, 6, 8. Synchronous speed at 50
Hz: 3000, 1500, 1000, 750, etc.
Two separate windings for two-speed motors
W2
V2 U2
W2
U1 V1 W1
L1 L2 L3
U2 V2
TM079953
High speed
U1
W1 V1
W2
U1 V1 W1
L1 L2 L3
U2 V2
TM079954
Low speed
Number of poles: 2/6, 2/8, 4/6, 6/8, etc. Synchronous
speed at 50 Hz: 3000/1000, 3000/750, 1500/1000,
1000/750, etc.
Dahlander system for two-speed motors, constant
torque
W2
V1
U1 W1
V2 U2
W2
U1 V1 W1
L1 L2 L3
U2 V2
TM079955
High speed
U1
U2
W2V2
W1 V1
W2
U1 V1 W1
L1 L2 L3
U2 V2
TM079956
Low speed
Number of poles: 2/4, 4/8. Synchronous speed at 50
Hz: 3000/1500, 1500/750.
Dahlander system for two-speed motors,
quadratic torque
W2
U1 V1 W1
L1 L2 L3
U2 V2
W2
V1
U1 W1
V2 U2
TM079958
High speed
U2
W2
V2
W2
U1 V1 W1
L1 L2 L3
U2 V2
U1
W1 V1
TM079957
Low speed
10
English (GB)

Number of poles: 2/4, 4/8. Synchronous speed at 50
Hz: 3000/1500, 1500/750.
Connection for single-phase and special motors
For single-phase motors and motors with special
connections, refer to the diagrams provided with the
motor.
Related information
7.2.3 Electrical characteristics
10.1 The motor does not start
10.5 Functioning of the protective device
7. Startup
It is the responsibility of the installer to determine
whether the motor is suitable to be used in a certain
plant, after analysing the characteristics of danger
existing in the installation area with respect to current
provisions of the law and to those issued for safety
purposes.
7.1 Initial controls
Before starting the motor, it is important to check that:
• installation has been carried out properly
• the bearings have not been damaged during
installation
• the motor base is sturdy enough, and the
foundation bolts have been tightened
• the design data corresponds to those given on the
nameplate and in the technical documentation.
The electric motor is a component made to be
mechanically connected to another machine (single
or part of a plant). Consequently, it is the task of the
person responsible for the installation to guarantee
that during operation there is an adequate degree of
protection for people or things against the danger of
accidental contact with moving parts.
7.2 Control of design data
Make sure that the motor is suited for use in the
working conditions foreseen.
7.2.1 Environmental conditions
Check the following:
• Ambient temperature: standard closed motors can
operate between -15 to +40 °C.
• Altitude: normal motors are designed to work
between 0 and 1000 m above sea level.
• Protection against mechanical stress, vibrations
and the presence of harmful substances like sand,
corrosive media, dust, fibre and water.
• Mechanical protection: install indoors or outdoors
considering the harmful effects of the weather, the
combined effect of temperature and humidity and
the formation of condensation.
• Adequate space around the motor, especially on
the fan side to allow proper ventilation.
• Motors mounted in the vertical orientation and
shaft down require a protective cowl over the fan
inlet.
• Any danger of explosion or fire.
7.2.2 Operating conditions
Check the following:
• The motor must only be assembled and operated
in the construction form indicated on the motor's
nameplate.
• Operation type: the motors are normally for S1
duty (continuous operation).
11
English (GB)

• Load type: carefully evaluate the high moments of
inertia and the relative starting time of the motor.
• For self-braking motors, see the special
applications in the relevant catalogue.
7.2.3 Electrical characteristics
Check the following:
• Voltage and frequency should correspond to
those on the nameplate.
• Motor power should be adequate as required by
the load.
• Power supply protection against overloads and/or
short circuits should be adequate for the nominal
current and the starting current.
• For connection to control circuits, follow the wiring
diagrams supplied with the motor. See section
about wiring diagrams.
Abnormal operating conditions must always be
defined when placing the order to ensure that the on-
site conditions do not hinder the proper operation of
the motor.
Related information
6.1 Wiring diagrams
7.2.4 Other checks before commissioning
• Make sure that the motor rotates in the correct
direction and that the speed limit is not exceeded
when the inverter is activated.
• Make sure that the motor is protected as
prescribed in the standards.
• When using a star-delta starter, avoid the risk of
overloading and make sure that the switchover
from star to delta only takes place when the
starting current has been adequately reduced.
• Make sure that all auxiliary accessories are
working.
7.3 Starting
7.3.1 Earthing connection
Before starting the motor, make sure that the
incoming supply cables are connected correctly.
7.3.2 Motors with auxiliary ventilation
For motors with forced ventilation by means of
external ventilation, make sure that the motor starter
is interlocked with the contactor of the external
ventilator to ensure the fan is operational.
7.3.3 Motor startup
When all previous checks have been made
satisfactorily, the motor may be started. Unless
otherwise stated, all motors can be direct-on-line
started.
If you intend to start the motor by means of static
starters, rheostats or the star-delta system, they must
be chosen and set properly to avoid incorrect
functioning of the motor.
7.4 Conditions of use
7.4.1 Operating characteristics
Once the motor has started, make sure that the
operating conditions are within the required limits and
that the following does not occur:
• overload
• rise in ambient temperature
• excessive drop in voltage.
Every time there is a change in the operating
conditions, make sure that the motor is completely
appropriate to the new operating conditions.
Examples of changes in the operating conditions:
• changes in operating cycle
• changes in motor functions
• moving the motor to a different environment
• moving the motor to a higher temperature
environment.
7.4.2 Protection against overloading
According to the IEC 60079-14 standard, all motors
must be protected using a suitable switch, such as
one with a delayed trip that is triggered by the current,
and the motors must also be protected against phase
loss. The protective device must be set according to
the nominal current shown on the nameplate. This
device must be chosen so that the motor is thermally
protected when a rotor jam occurs.
The windings connected in delta must be protected in
such a way that the switches or relays are connected
in series with the winding phase. Switches are to be
chosen and set taking 0.58 times the nominal phase
current of the motor as the base value.
12
English (GB)

8. Service
Any operation on the motor must be carried out with
the machine stopped and disconnected from the
power supply (including auxiliary circuits, especially
the anticondensation heaters). Maintenance of the
original characteristics of electric machines over time
must be ensured by a schedule of inspection,
maintenance and installation managed by qualified
technicians.
The type and frequency of maintenance depends on
environmental and working conditions. As a rule, it is
recommended that the first inspection is made after
about 500 hours of operation or within 1 year, while
subsequent inspections should follow the schedules
established for lubrication and general inspection.
8.1 Checking
8.1.1 Normal operation
Check that the motor works normally without
anomalous noise or vibrations. If it does not, locate
the cause of the anomaly.
8.1.2 Cleaning the surface
Make sure that the ventilation is not obstructed.
Clean the motor by removing any dust or fibre
deposits from the fins and from the fan cover.
8.1.3 Checking the supply and earthing cable
Check that the supply cable does not show signs of
wear and that the connections are tight. Make sure
that the earth and supply cables are not damaged.
8.1.4 Transmission elements
Check that the transmission elements are in perfect
condition and that the screws and nuts are tight.
8.1.5 Protection against water
When the motor is installed in a very damp
environment or is subject to drips of water, check
regularly that the seal and retaining devices work
efficiently. Make sure that there is no infiltration inside
the casing or terminal box.
8.1.6 Drainage devices
The motors equipped with drainage devices should
be checked and cleaned regularly so that such
devices continue to work properly.
8.1.7 Thermal protection
Make sure that thermal protections have not cut out
and have been set properly.
8.1.8 Unauthorised modifications
Check that no modifications have been made that
alter the electric and mechanical operation of the
motor.
8.1.9 Painting
When the motor is installed in an environment where
there are corrosive agents, it is recommended
painting the motor itself to protect the outer surfaces
from corrosion if necessary.
8.1.10 Repairing operations
Any faults found during inspection must be fixed
immediately.
8.2 Lubrication
8.2.1 Permanently lubricated bearings
Motors with shielded or sealed bearings do not
require lubrication. They do not require maintenance
if used properly.
8.2.2 Bearings with lubricator
Motors with unshielded bearings are equipped with
lubricators. The lubrication interval depends on the
type of grease, the ambient temperature (any
excessive operating temperature), and the type of
operation the motor carries out. The table below
shows the predicted intervals for 70 °C as an
operating temperature of the bearings in normal
operating conditions. It is recommended using a good
quality lithium-based grease with great penetration
capacity and high dropping point. If the velocity is
different from the one given in the table, the intervals
must be modified in inverse proportion.
Example:
Bearing 6314 at 1800 rpm.
1 = 1500/1800 × 3550 h = 2950 h
Regardless of the operating hours, the grease must
be renewed after 1 or 2 years or during a complete
overhaul. When the motor is equipped with a
lubrication plate, refer to the dates shown on it.
13
English (GB)

Lubrication intervals in hours for unshielded bearings
Ball bearings Lubrication intervals in duty hours
Frame size
Amount of
grease
[g]
3600 rpm 3000 rpm 1800 rpm 1500 rpm 1200 rpm 1000 rpm 500-900 rpm
112, 132 15 4200 4800 7000 7800 8500 10000 10500
160, 180 20 3200 4200 6000 7000 8000 9000 10000
200, 225 25 1800 3100 5500 6500 7500 8500 9500
250, 280 35 800 2000 5000 6000 7000 8000 9000
315 50 800 2000 4600 5500 6500 7500 8000
355, 400 60 1000 4000 5000 6000 7000 8000
8.3 Dismantling and reassembling
All operations must be carried out
conforming to health and safety
regulations.
8.3.1 Consulting the catalogue
Before working on the motor, we
recommend that you consult the relevant
catalogue and have all the tools ready.
8.3.2 Disconnection from power supply
Before proceeding with dismantling, the
motor must be disconnected from the
power supply. Make sure that the power is
off, and disconnect the supply cables and
auxiliary cables, if any.
8.3.3 Placing on work stand
In order to work on the motor satisfactorily, it should
be removed from its mounting and placed on a work
stand.
8.3.4 Dismantling procedure
When the motor is dismantled and before
it is reassembled, it is necessary to protect
the various components (particularly the
bearings and windings) to avoid damage
caused by dust or knocks.
1. Take off the fan cover by removing the screws.
2. Use an extractor to remove the cooling fan.
3. Remove the end shields and withdraw the rotor
being careful not to damage the windings.
8.3.5 Additions for self-braking motors
For dismantling self-braking motors, follow the
instructions shown in the relevant catalogue.
8.4 Bearing replacement
8.4.1 Dismantling the bearings
• Bearings interference fit to shaft: remove the
bearings with the aid of a suitable extractor.
• Bearings interference fit to end shield: heat end
shield to a temperature between 140 and 160 °C,
and then remove the bearings with the aid of a
suitable extractor.
In both cases, check that the respective housings
have not been damaged. Then proceed with fitting
the new bearings that should be identical to those
being replaced.
8.4.2 Fitting new bearings
• Bearings interference fit to shaft: heat the
bearings to 120-130 ℃ and push them quickly
onto the shafts. If required, use a mallet and a
brass sleeve which must rest on the inner race of
the bearing. Alternatively, if it is not possible to
heat the bearings, we recommend using a press
and a suitable sleeve which must rest on the inner
race of the bearing.
• Bearings interference fit to end shield: heat the
end shield to a maximum temperature of 140 °C,
then position the bearing in its housing and push it
until it rests against the snap ring.
8.4.3 Checking the bearings
• Bearings interference fit to shaft: after assembly
has been completed, the inner ring of the bearing
must rest against the relevant shaft shoulder.
• Bearings interference fit to end shield: after
assembly has been completed, the inner ring of
the bearing must rest against the snap ring.
8.4.4 Reassembling the motor
1. Before reassembling, clean the internal parts of
the motor carefully and check that the
components have not been damaged.
14
English (GB)

2. Apply a new layer of grease where needed on the
abutting spigots, and proceed with the
reassembling.
8.5 Repairs and overhauls
8.5.1 Spare parts
When needed, all motor components should be
replaced by original spare parts. To request spare
parts, use the technical terms shown in the
catalogues and always provide the following:
• motor type
• serial number
• year of production.
8.5.2 Authorised service workshops
Overhauls and repairs must be carried out by trained
persons who guarantee restoration of the motor to its
original condition. We recommend that you contact an
authorised service workshop. For further information,
contact your local Grundfos sales company.
9. Storage
All operations listed below must be carried out by
qualified persons. In case of flame-proof motors, it is
necessary:
• to be very careful the flame-proof characteristics
are not altered
• to have the procedure described in section about
checking the bearings carried out by authorised
service workshops
• to be aware that dismantling or opening the motor
during the warranty period without authorisation of
Grundfos may invalidate the warranty.
9.1 Storage conditions
If the motors are not used immediately, they should
be stored in a clean, dry environment with moderate
temperature, free of vibrations and protected from the
weather. In this case, it is necessary to specify these
particular storage conditions during the ordering
stage so that proper precautions can be taken during
building and packaging.
lf stored below -15 °C, the motor
temperature must be restored to the
permissible operating temperature range
from -15 to +40 °C before starting.
9.2 Checking the bearings
When the motors are stored properly, no maintenance
is needed. However, it is a good idea to turn the shaft
by hand every three months. After storage of over
one year, motors with unshielded bearings (usually
such motors have a lubricator and bear a lubrication
plate), we recommend checking the condition of the
lubrication and motor components.
9.3 Checking the insulation
Before installation, check the motor windings using
the appropriate instruments to ensure the condition of
the insulation between phases and earth are of the
correct resistance values. Do not touch the terminals
during and immediately after measuring as they are
live. If the insulation resistance value is less than 10
megaohm or after storage in a damp environment,
the motors must be dried in an oven for about eight
hours by gradually bringing the temperature up to 100
°C. To ensure that the dampness has been
completely expelled, the motors must be dismantled.
15
English (GB)

10. Fault finding the product
10.1 The motor does not start
Cause Remedy
Fuses damaged due to start overloading • Replace the fuses with similar ones of the correct
size.
Opening of the overload switch • Check and reset the switches.
Insufficient power available • Check that the power required is as shown on the
nameplate of the motor.
Connections incorrect • Check that the connections are as shown in the
wiring diagram of the motor.
Mechanical fault • Check that the motor and the machine to which it is
coupled turn freely.
• Check the bearings and lubricant.
Short circuit on the stator • The motor must be rewound.
Defective rotor • Check whether the bars and the rings are broken.
• If necessary, replace the rotor.
One phase is down • Check the connection cables.
Incorrect application • Check the sizing with the manufacturer.
Overload • Reduce the load.
Voltage too low • Make sure that the motor is powered with the
voltage shown on the nameplate.
Related information
6.1 Wiring diagrams
10.2 The motor does not reach its nominal speed or the acceleration times are too long
and/or absorption excessive
Cause Remedy
Voltage drop on the line • Check the connections.
• Check that the cables are of the correct size.
Excessive inertia • Check the size of the motor.
• Check that the cables are of the correct size.
Defective motor • Check the state of the rotor cage.
• Replace the rotor if necessary.
10.3 The motor overheats when working under load
Cause Remedy
Overload • Reduce the load.
16
English (GB)

Cause Remedy
Cooling fins and/or fan cover blocked by dirt • Clean the ventilation slots to ensure a continuous
flow of air over the motor.
One phase on the motor is down • Check that all the cables are connected tightly and
correctly.
One phase on the winding is earthed • Check the winding and remove the fault.
Phase voltages asymmetrical • Check the power supply and voltage supply, and
rebalance the loads.
Duty too high • Follow the instructions on the nameplate to use the
motor.
10.4 Incorrect rotation
Cause Remedy
Incorrect phase sequence • Invert two phases.
10.5 Functioning of the protective device
Cause Remedy
The motor has one phase down • Check the power supply.
Wrong connection • Follow the wiring diagram for the connections and
the performance data shown on the nameplate.
Overload • Compare against the data on the nameplate, and
reduce the load if necessary.
Related information
6.1 Wiring diagrams
10.6 Abnormal vibrations
Cause Remedy
Motor not aligned • Align the motor with the machine it controls.
Base weak • Reinforce the base. Check the bolts.
Coupling or pulley not balanced • Balance the device.
Coupled machine unbalanced • Balance the coupled machine.
Defective bearings • Replace the bearings.
Motor balanced differently from the coupling (half key
- full key) • Balance the coupling using the half key.
Three-phase motor working with one phase down • Check the phases and reinstate the three-phase
system.
Excessive play on the bearings • Replace the bearings or the shield, or add a shim to
the bearing seating.
17
English (GB)

10.7 Irregular noise
Cause Remedy
Mechanical friction (including stator and rotor friction) • Check the gap between the rotating part and the
stationary part.
• Find out the reason for the friction and correct it.
Defective bearings • Replace the bearings.
10.8 Bearings overheating
Cause Remedy
Motor fitted incorrectly • Check that the motor is adequate for the type of
fitting.
Belts overtensioned • Reduce the belt tension.
Pulleys too far from the shaft shoulder • Move the pulley nearer to the shoulder on the motor
shaft.
Pulley diameter too small • Use a bigger pulley.
Alignment incorrect • Correct the alignment of the motor and the machine
coupled to it.
Insufficient grease • Keep the correct amount of lubricant in the bearings.
Lubricant ineffective or contaminated • Remove the old grease, wash contaminated
bearings carefully and grease them with new
lubricant.
Excessive lubricant • Reduce the amount of lubricant. The bearing must
not be more than half full.
Bearing overloaded • Check the alignment and any radial and/or axial
thrust.
Bearing balls or race damaged • Replace the bearing.
11. Disposing of the product
This product or parts of it must be disposed of in an
environmentally sound way.
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
The crossed-out wheelie bin symbol
on a product means that it must be
disposed of separately from household
waste. When a product marked with
this symbol reaches its end of life, take
it to a collection point designated by
the local waste disposal authorities.
The separate collection and recycling
of such products will help protect the
environment and human health.
See also end-of-life information at
www.grundfos.com/product-recycling.
18
English (GB)

Argentina
Bombas GRUNDFOS de Argentina S.A.
Ruta Panamericana km. 37.500industin
1619 - Garín Pcia. de B.A.
Tel.: [phone]
Fax: [phone]
Australia
GRUNDFOS Pumps Pty. Ltd.
P.O. Box 2040
Regency Park
South Australia 5942
Tel.: [phone]
Fax: [phone]
Austria
GRUNDFOS Pumpen Vertrieb
Ges.m.b.H.
Grundfosstraße 2
A-5082 Grödig/Salzburg
Tel.: [phone]
Fax: [phone]
Belgium
N.V. GRUNDFOS Bellux S.A.
Boomsesteenweg 81-83
B-2630 Aartselaar
Tel.: [phone]
Fax: [phone]
Belarus
Представительство ГРУНДФОС в
Минске
220125, Минск
ул. Шафарнянская, 11, оф. 56, БЦ
«Порт»
Тел.: [phone]
[phone]
Факс: [phone]
E-mail: [email protected]
Bosnia and Herzegovina
GRUNDFOS Sarajevo
Zmaja od Bosne 7-7A
BiH-71000 Sarajevo
Tel.: [phone]
Fax: [phone]
www.ba.grundfos.com
E-mail: [email protected]
Brazil
BOMBAS GRUNDFOS DO BRASIL
Av. Humberto de Alencar Castelo
Branco, 630
CEP 09850 - 300
São Bernardo do Campo - SP
Tel.: [phone]
Fax: [phone]
Bulgaria
Grundfos Bulgaria EOOD
Slatina District
Iztochna Tangenta street no. 100
BG - 1592 Sofia
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Canada
GRUNDFOS Canada inc.
2941 Brighton Road
Oakville, Ontario
L6H 6C9
Tel.: [phone]
Fax: [phone]
China
GRUNDFOS Pumps (Shanghai) Co. Ltd.
10F The Hub, No. 33 Suhong Road
Minhang District
Shanghai 201106 PRC
Tel.: [phone]
Fax: [phone]
Columbia
GRUNDFOS Colombia S.A.S.
Km 1.5 vía Siberia-Cota Conj. Potrero
Chico,
Parque Empresarial Arcos de Cota Bod.
1A.
Cota, Cundinamarca
Tel.: [phone]
Fax: [phone]
Croatia
GRUNDFOS CROATIA d.o.o.
Buzinski prilaz 38, Buzin
HR-10010 Zagreb
Tel.: [phone]
Fax: [phone]
www.hr.grundfos.com
Czech Republic
GRUNDFOS Sales Czechia and Slovakia
s.r.o.
Čajkovského 21
779 00 Olomouc
Tel.: [phone]
Denmark
GRUNDFOS DK A/S
Martin Bachs Vej 3
DK-8850 Bjerringbro
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
www.grundfos.com/DK
Estonia
GRUNDFOS Pumps Eesti OÜ
Peterburi tee 92G
11415 Tallinn
Tel.: + 372 606 1690
Fax: + 372 606 1691
Finland
OY GRUNDFOS Pumput AB
Trukkikuja 1
FI-01360 Vantaa
Tel.: [phone]
France
Pompes GRUNDFOS Distribution S.A.
Parc d’Activités de Chesnes
57, rue de Malacombe
F-38290 St. Quentin Fallavier (Lyon)
Tel.: [phone]
Fax: [phone]
Germany
GRUNDFOS GMBH
Schlüterstr. 33
40699 Erkrath
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Service in Deutschland:
[email protected]
Greece
GRUNDFOS Hellas A.E.B.E.
20th km. Athinon-Markopoulou Av.
P.O. Box 71
GR-19002 Peania
Tel.: [phone]
Fax: [phone]
Hong Kong
GRUNDFOS Pumps (Hong Kong) Ltd.
Unit 1, Ground floor, Siu Wai industrial
Centre
29-33 Wing Hong Street & 68 King Lam
Street, Cheung Sha Wan
Kowloon
Tel.: [phone]
Fax: [phone]
Hungary
GRUNDFOS Hungária Kft.
Tópark u. 8
H-2045 Törökbálint
Tel.: [phone]
Fax: [phone]
India
GRUNDFOS Pumps india Private Limited
118 Old Mahabalipuram Road
Thoraipakkam
Chennai 600 097
Tel.: [phone]
Indonesia
PT GRUNDFOS Pompa
Graha intirub Lt. 2 & 3
Jln. Cililitan Besar No.454. Makasar,
Jakarta Timur
ID-Jakarta 13650
Tel.: [phone]
Fax: [phone]
Ireland
GRUNDFOS (Ireland) Ltd.
Unit A, Merrywell Business Park
Ballymount Road Lower
Dublin 12
Tel.: [phone]
Fax: [phone]
Italy
GRUNDFOS Pompe Italia S.r.l.
Via Gran Sasso 4
I-20060 Truccazzano (Milano)
Tel.: [phone]
Fax: [phone]
Japan
GRUNDFOS Pumps K.K.
1-2-3, Shin-Miyakoda, Kita-ku
Hamamatsu
431-2103 Japan
Tel.: [phone]
Fax: [phone]
Korea
GRUNDFOS Pumps Korea Ltd.
6th Floor, Aju Building 679-5
Yeoksam-dong, Kangnam-ku, 135-916
Seoul, Korea
Tel.: [phone]
Fax: [phone]
Grundfos companies

Latvia
SIA GRUNDFOS Pumps Latvia
Deglava biznesa centrs
Augusta Deglava ielā 60
LV-1035, Rīga,
Tel.: + 371 714 9640, 7 149 641
Fax: + 371 914 9646
Lithuania
GRUNDFOS Pumps UAB
Smolensko g. 6
LT-03201 Vilnius
Tel.: + 370 52 395 430
Fax: + 370 52 395 431
Malaysia
GRUNDFOS Pumps Sdn. Bhd.
7 Jalan Peguam U1/25
Glenmarie industrial Park
40150 Shah Alam, Selangor
Tel.: [phone]
Fax: [phone]
Mexico
Bombas GRUNDFOS de México
S.A. de C.V.
Boulevard TLC No. 15
Parque industrial Stiva Aeropuerto
Apodaca, N.L. 66600
Tel.: [phone]
Fax: [phone]
Netherlands
GRUNDFOS Netherlands
Veluwezoom 35
1326 AE Almere
Postbus 22015
1302 CA ALMERE
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
New Zealand
GRUNDFOS Pumps NZ Ltd.
17 Beatrice Tinsley Crescent
North Harbour Industrial Estate
Albany, Auckland
Tel.: [phone]
Fax: [phone]
Norway
GRUNDFOS Pumper A/S
Strømsveien 344
Postboks 235, Leirdal
N-1011 Oslo
Tel.: [phone]
Fax: [phone]
Poland
GRUNDFOS Pompy Sp. z o.o.
ul. Klonowa 23
Baranowo k. Poznania
PL-62-081 Przeźmierowo
Tel.: [phone]
Fax: [phone]
Portugal
Bombas GRUNDFOS Portugal, S.A.
Rua Calvet de Magalhães, 241
Apartado 1079
P-2770-153 Paço de Arcos
Tel.: [phone]
Fax: [phone]
Romania
GRUNDFOS Pompe România SRL
S-PARK BUSINESS CENTER, Clădirea
A2, etaj 2
Str. Tipografilor, Nr. 11-15, Sector 1, Cod
013714
Bucuresti, Romania
Tel.: [phone]
E-mail: [email protected]
Russia
ООО Грундфос Россия
ул. Школьная, 39-41
Москва, RU-109544, Russia
Тел. [phone] [phone]
Факс [phone]
E-mail [email protected]
Serbia
Grundfos Srbija d.o.o.
Omladinskih brigada 90b
11070 Novi Beograd
Tel.: [phone]
Fax: [phone]
www.rs.grundfos.com
Singapore
GRUNDFOS (Singapore) Pte. Ltd.
25 Jalan Tukang
Singapore 619264
Tel.: [phone]
Faxax: [phone]
Slovakia
GRUNDFOS s.r.o.
Prievozská 4D 821 09 BRATISLAVA
Tel.: [phone]
sk.grundfos.com
Slovenia
GRUNDFOS LJUBLJANA, d.o.o.
Leskoškova 9e, 1122 Ljubljana
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
South Africa
GRUNDFOS (PTY) LTD
16 Lascelles Drive, Meadowbrook Estate
1609 Germiston, Johannesburg
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Spain
Bombas GRUNDFOS España S.A.
Camino de la Fuentecilla, s/n
E-28110 Algete (Madrid)
Tel.: [phone]
Fax: [phone]
Sweden
GRUNDFOS AB
Box 333 (Lunnagårdsgatan 6)
431 24 Mölndal
Tel.: [phone]
Fax: [phone]
Switzerland
GRUNDFOS Pumpen AG
Bruggacherstrasse 10
CH-8117 Fällanden/ZH
Tel.: [phone]
Fax: [phone]
Taiwan
GRUNDFOS Pumps (Taiwan) Ltd.
7 Floor, 219 Min-Chuan Road
Taichung, Taiwan, R.O.C.
Tel.: [phone]
Fax: [phone]
Thailand
GRUNDFOS (Thailand) Ltd.
92 Chaloem Phrakiat Rama 9 Road
Dokmai, Pravej, Bangkok 10250
Tel.: [phone]
Fax: [phone]
Turkey
GRUNDFOS POMPA San. ve Tic. Ltd.
Sti.
Gebze Organize Sanayi Bölgesi
Ihsan dede Caddesi
2. yol 200. Sokak No. 204
41490 Gebze/ Kocaeli
Tel.: +90 - 262-679 7979
Fax: +90 - 262-679 7905
E-mail: [email protected]
Ukraine
Бізнес Центр Європа
Столичне шосе, 103
м. Київ, 03131, Україна
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
United Arab Emirates
GRUNDFOS Gulf Distribution
P.O. Box 16768
Jebel Ali Free Zone, Dubai
Tel.: [phone]
Fax: [phone]
United Kingdom
GRUNDFOS Pumps Ltd.
Grovebury Road
Leighton Buzzard/Beds. LU7 4TL
Tel.: [phone]
Fax: [phone]
U.S.A.
GRUNDFOS Water Utility Headquarters
856 Koomey Road
Brookshire, Texas 77423 USA
Uzbekistan
Grundfos Tashkent, Uzbekistan
The Representative Office of Grundfos
Kazakhstan in Uzbekistan
38a, Oybek street, Tashkent
Tel.: [phone]
Fax: [phone]
Revision Info
Last revised on 09-09-2020
Grundfos companies