Grundfos SEG Series User manual

SEG
50 Hz
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe Grundfos SEG pumps.
Sections 1-5 give the information necessary to be
able to unpack, install and start up the product in a
safe way.
Sections 6-11 give important information about the
product, as well as information on service, fault
finding and disposal of the product.
CONTENTS
Page
1. General information 3
1.1 Hazard statements 3
1.2 Notes 3
1.3 Target groups 3
2. Receiving the product 3
2.1 Transporting the product 3
3. Installing the product 4
3.1 Mechanical installation 4
3.2 Electrical connection 8
4. Starting up the product 10
4.1 Operating modes 11
4.2 Start and stop levels 11
4.3 Direction of rotation 12
4.4 Startup 12
4.5 Resetting the pump 13
5. Handling and storing the product 13
5.1 Handling the product 13
5.2 Storing the product 13
6. Product introduction 13
6.1 Product description 13
6.2 Applications 14
6.3 Pumped liquids 14
6.4 Potentially explosive environments 14
6.5 Approvals 15
6.6 Identification 16
7. Protection and control functions 17
7.1 LC and LCD level controllers 17
7.2 Thermal switches 17
7.3 CU 100 control unit 18
7.4 Frequency converter operation 18
8. Servicing and maintaining the product 19
8.1 Safety instructions and requirements 19
8.2 Contaminated pumps 20
8.3 Maintenance schedule 20
8.4 Oil check and oil change 21
8.5 Adjusting the impeller clearance 21
8.6 Replacing the grinder system 22
8.7 Cleaning the pump housing 22
8.8 Checking or replacing the shaft seal 23
8.9 Service kits 24
9. Fault finding the product 25
10. Technical data 26
10.1 Operating conditions 26
10.2 Electrical data 26
10.3 Dimensions and weights 26
11. Disposing of the product 27
Read this document before installing the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
This appliance can be used by children
aged from 8 years and above and persons
with reduced physical, sensory or mental
capabilities or lack of experience and
knowledge if they have been given
supervision or instruction concerning use
of the appliance in a safe way and
understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not
be made by children without supervision.

English (GB)
3
1. General information
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
The hazard statements are structured in the
following way:
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
The Ex symbol refers to ATEX-approved and IECEx-
approved products.
1.3 Target groups
These installation and operating instructions are
intended for professional installers.
2. Receiving the product
The pump may be transported and stored in a
vertical or horizontal position. Make sure that the
pump cannot roll or fall over.
2.1 Transporting the product
All lifting equipment must be rated for the purpose
and checked for damage before any attempts to lift
the pump. The lifting equipment rating must under no
circumstances be exceeded. The pump weight is
stated on the nameplate.
The polyurethane-embedded plug prevents water
from penetrating into the motor via the power cable.
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.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.
Observe these instructions for explosion-
proof products.
A blue or grey circle with a white graphical
symbol indicates that an action must be
taken.
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.
WARNING
Crushing hazard
Death or serious personal injury
- Do not stack pump packages or pallets
on top of each other when lifting or
moving them.
- Always lift the pump by its lifting bracket
or by means of a forklift truck if the
pump is fixed on a pallet. Never lift the
pump by means of the power cable or
the hose or pipe.
CAUTION
Sharp element
Minor or moderate personal injury
- Make sure not to cut your hands on the
sharp edges when opening the pump
package.
We recommend that you keep the cable
end protectors in storage for later use.

English (GB)
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3. Installing the product
For safety reasons, all work in pits must be
supervised by a person outside the pit.
Carelessness during lifting or transportation may
cause personal injury or damage to the pump.
3.1 Mechanical installation
Fit the extra nameplate supplied with the pump at the
installation site or keep it in the cover of this booklet.
Observe all safety regulations at the installation site,
for instance the use of blowers for fresh-air supply to
the pit.
Check the oil level in the oil chamber before
installing the pump. See section 8.4 Oil check and oil
change.
The pumps are suitable for different installation types
which are described in sections 3.1.2 Installation on
auto coupling and 3.1.3 Free-standing submerged
installation.
SEG.50 (high-flow) pumps have a cast DN 50 outlet
flange. All other pumps have a cast DN 40 outlet
flange.
Pump installation in pits must be carried
out by specially trained persons.
Work in or near pits must be carried out
according to local regulations.
Persons must not enter the installation
area when the atmosphere is explosive.
DANGER
Electric shock
Death or serious personal injury
- It must be possible to lock the main
switch in position 0. Type and
requirements as specified in EN 60204-
1, 5.3.2.
DANGER
Electric shock
Death or serious personal injury
- Make sure there are at least 3 m free
cable above the maximum liquid level.
We recommend that you make all
maintenance and service work when the
pump is placed outside the pit.
DANGER
Crushing hazard
Death or serious personal injury
- Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary.
Make sure the pit bottom is even before
installing the product.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply and lock the
main switch in position 0.
- Switch off any external voltage
connected to the product before working
on it.
CAUTION
Hot surface
Minor or moderate personal injury
- Make sure that the pump has cooled
down before touching it.
DANGER
Electric shock
Death or serious personal injury
- Before installing the pump and starting it
up for the first time, check the power
cable for visible defects to avoid short
circuits.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean
water and rinse the pump parts in water
after dismantling.
Pits for submersible sewage and
wastewater pumps may contain sewage
or wastewater with toxic and/or disease-
causing substances.
- Wear appropriate personal protective
equipment and clothing.
- Observe the local hygiene regulations in
force.

English (GB)
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3.1.1 Lifting the product
Carelessness during lifting or transportation may
cause personal injury or damage to the pump.
Carelessness during lifting or transportation may
cause injury persons or damage to the pump.
When lifting the pump, use the right lifting point to
keep the pump balanced. Place the lifting chain hook
in point A for auto-coupling installations and in point
B for other installations. See fig. 1.
Fig. 1 Lifting points
The pumps are designed for intermittent
operation. When completely submerged in
the pumped liquid, the pumps can also
operate continuously (S1).
Always use Grundfos accessories to avoid
malfunctions due to incorrect installation.
Only use the lifting bracket for lifting the
pump. Do not use it to hold the pump when
in operation.
CAUTION
Crushing of hands
Minor or moderate personal injury
- Do not put your hands or any tool into
the pump inlet or outlet port after the
pump has been connected to the power
supply, unless the pump has been
switched off by removing the fuses or
switching off the main switch.
- Make sure that the power supply cannot
be accidentally switched on.
CAUTION
Sharp element
Minor or moderate personal injury
- Do not touch the sharp edges of the
impeller, grinder head, and grinder ring
without wearing gloves.
CAUTION
Biological hazard
Minor or moderate personal injury
- Make sure to seal the pump outlet
properly when fitting the outlet pipe,
otherwise water might spray out of the
sealing.
WARNING
Crushing of hands
Death or serious personal injury
- When lifting the pump, make sure your
hand is not caught between the lifting
bracket and the hook.
WARNING
Crushing hazard
Death or serious personal injury
- Make sure that the hook is fixed
properly to the lifting bracket.
- Always lift the pump by its lifting bracket
or by means of a forklift truck if the
pump is fixed on a pallet.
- Never lift the pump by means of the
power cable, hose or pipe.
- Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary.
TM06 0066 4813

English (GB)
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3.1.2 Installation on auto coupling
Pumps for permanent installation can be mounted on
a stationary auto-coupling guide rail system or a
hookup auto-coupling system.
Both auto-coupling systems facilitate maintenance
and service as the pump can easily be lifted out of
the pit.
We recommend that you use loose flanges to ease
the installation and to avoid pipe tension at flanges
and bolts.
Auto-coupling guide rail system
See fig. 1in Appendix.
Proceed as follows:
1. Drill mounting holes for the guide rail bracket on
the inside of the pit, and fasten the guide rail
bracket provisionally with two anchor bolts.
2. Place the auto-coupling base unit on the bottom
of the pit. Use a plumb line to establish the
correct positioning. Fasten the auto coupling with
heavy-duty anchor bolts. If the bottom of the pit is
uneven, the auto-coupling base unit must be
supported so that it is level when being fastened.
3. Assemble the outlet line in accordance with the
generally accepted procedures and without
exposing the line to distortion or tension.
4. Insert the guide rails in the auto-coupling base
unit and adjust the length of the rails accurately
to the guide rail bracket at the top of the pit.
5. Unscrew the provisionally fastened guide rail
bracket, fit it on top of the guide rails, and finally
fasten it firmly to the pit wall.
6. Clean out debris from the pit before lowering the
pump into the pit.
7. Fit the guide claw to the pump outlet. Grease the
gasket of the guide claw before lowering the
pump into the pit.
8. Slide the guide claw between the guide rails and
lower the pump into the pit by means of a chain
secured to the lifting bracket of the pump. When
the pump reaches the auto-coupling base unit,
the pump will automatically connect tightly.
9. Hang up the end of the chain on a suitable hook
at the top of the pit and in such a way that the
chain cannot come into contact with the pump
housing.
10. Adjust the length of the power cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief
fitting to a suitable hook at the top of the pit.
Make sure that the cable is not sharply bent or
pinched.
11. Connect the power cable and the control cable, if
any.
Before beginning installation procedures,
make sure that the atmosphere in the pit is
not potentially explosive.
Make sure that the pipes are installed
without the use of undue force. No loads
from the weight of the pipes must be
carried by the pump.
Do not use elastic elements or bellows in
the pipes. Never use these elements as a
means to align the pipes.
The guide rails must not have any axial
play as this would cause noise during
pump operation.
When the pump has reached the auto-
coupling base unit, shake the pump by
means of the chain to make sure that it is
placed in the correct position.
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.

English (GB)
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Hookup auto-coupling system
See fig. 2in Appendix.
Proceed as follows:
1. Fit a crossbar in the pit.
2. Fit the stationary part of the auto coupling on top
of the crossbar.
3. Fit the adapted piece of pipe for the movable part
of the hookup auto coupling to the pump outlet.
4. Fasten a shackle and a chain to the movable part
of the hookup auto coupling.
5. Clean out debris from the pit before lowering the
pump.
6. Lower the pump into the pit by means of the
chain secured to the lifting bracket of the pump.
When the movable part of the auto coupling
reaches the stationary part, the two will normally,
automatically connect tightly.
7. Hang up the end of the chain on a suitable hook
at the top of the pit and in such a way that the
chain cannot come into contact with the pump
housing.
8. Adjust the length of the power cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief
fitting to a suitable hook at the top of the pit.
Make sure that the cable is not sharply bent or
pinched.
9. Connect the power cable and the control cable, if
any.
3.1.3 Free-standing submerged installation
Pumps for free-standing submerged installation can
stand freely on the bottom of the pit or similar
location. See fig. 3in Appendix.
The pump must be mounted on separate feet
(accessory).
In order to facilitate service on the pump, fit a flexible
union or coupling to the outlet line for easy
separation.
If a hose is used, make sure that the hose does not
buckle and that the inside diameter of the hose
matches that of the outlet port.
If a rigid pipe is used, fit the union or coupling, non-
return valve and isolating valve in the order
mentioned, when viewed from the pump.
If the pump is installed in muddy conditions or on
uneven ground, we recommend that you support the
pump on bricks or a similar support.
Proceed as follows:
1. Fit a 90 ° elbow to the pump outlet port and
connect the outlet pipe or hose.
2. Lower the pump into the liquid by means of a
chain secured to the lifting bracket of the pump.
We recommend that you place the pump on a
plane, solid foundation. Make sure that the pump
is hanging from the chain and not the power
cable.
3. Hang up the end of the chain on a suitable hook
at the top of the pit and in such a way that the
chain cannot come into contact with the pump
housing.
4. Adjust the length of the power cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief
fitting to a suitable hook at the top of the pit.
Make sure that the cable is not sharply bent or
pinched.
5. Connect the power cable and the control cable, if
any.
When the pump has reached the auto-
coupling base unit, shake the pump by
means of the chain to make sure that it is
placed in the correct position.
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.
If several pumps are installed in the same
pit, the pumps must be installed at the
same level in order to allow optimum pump
alternation.

English (GB)
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3.2 Electrical connection
Carry out the electrical connection according to local
regulations.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump to an external main
switch which ensures all-pole
disconnection with a contact separation
according to EN 60204-1, 5.3.2.
- It must be possible to lock the main
switch in position 0. Type and
requirements as specified in EN 60204-
1, 5.3.2.
Connect the pumps to a control unit with a
motor protection relay with IEC trip class
10 or 15.
Pumps to be installed in potentially
explosive locations must be connected to
a control box with a motor protection relay
with IEC trip class 10.
The permanent installation must be fitted
with an earth-leakage circuit breaker.
Make sure there are at least 3 m free cable
above the maximum liquid level.
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the free
end of the power cable in potentially
explosive environments.
The classification of the installation site
must be approved according to local rules
in each individual case.
On explosion-proof pumps, make sure that
an external earth conductor is connected
to the external earth terminal of the pump
using a conductor with a secure cable
clamp. Clean the surface of the external
earth connection and fit the cable clamp.
The cross-section of the earth conductor
must be at least 4 mm2, e.g. type H07 V2-
K (PVT 90 °) yellow and green.
Make sure that the earth connection is
protected against corrosion.
Make sure that all protective equipment
has been connected correctly.
Float switches used in potentially
explosive environments must be approved
for this application. They must be
connected to the Grundfos LC, LCD 108
pump controller via the intrinsically safe
LC-Ex4 barrier to ensure a safe circuit.
DANGER
Electric shock
Death or serious personal injury
- If the power cable is damaged, it must
be replaced by the manufacturer, his
service agent or a similarly qualified
person.
Set the motor-protective circuit breaker to
the rated current of the pump. The rated
current is stated on the pump nameplate.
Make sure that the pump is connected in
accordance with the instructions given in
this booklet.

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The supply voltage and frequency are marked on the
pump nameplate. For voltage tolerance, see section
10. Technical data. Make sure that the motor is
suitable for the power supply available at the
installation site.
All pumps are supplied with 10 m cable and a free
cable end.
The pump must be connected to one of these two
controller types:
• a control unit with motor-protective circuit
breaker, such as a Grundfos CU 100
• a Grundfos LC, LCD 107, LC, LCD 108 or LC,
LCD 110 pump controller.
See fig. 2or 3and the installation and operating
instructions for the selected control unit or pump
controller.
In potentially explosive environments you have two
options:
• Use float switches made for an Ex environment
and a safety barrier in combination with either
DC, DCD or LC, LCD 108.
• Use air bells in combination with LC, LCD 107.
For more information about the function of the
thermal switches, see section 7.2 Thermal switches.
3.2.1 Wiring diagrams
Fig. 2 Wiring diagram for single-phase pumps
Fig. 3 Wiring diagram for three-phase pumps
DANGER
Electric shock
Death or serious personal injury
- Before the first startup of the pump,
check the power cable for visible
defects to avoid short circuits.
A possible replacement of the power cable
must be carried out by Grundfos or a
service workshop authorised by Grundfos.
TM06 5691 5315TM06 5692 5315

English (GB)
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4. Starting up the product
CAUTION
Crushing of hands
Minor or moderate personal injury
- Do not put your hands or any tool into
the pump inlet or outlet port after the
pump has been connected to the power
supply, unless the pump has been
switched off by removing the fuses or
switching off the main switch.
- Make sure that the power supply cannot
be accidentally switched on.
Before starting the product:
- Make sure that the fuses have been
removed.
- Make sure that all protective equipment
has been connected correctly.
CAUTION
Biological hazard
Minor or moderate personal injury
- Make sure to seal the pump outlet
properly when fitting the outlet pipe
otherwise water might spray out of the
sealing.
WARNING
Crushing of hands
Death or serious personal injury
- When lifting the pump, make sure your
hand is not caught between the lifting
bracket and the hook.
DANGER
Crushing hazard
Death or serious personal injury
- Make sure that the hook is fixed
properly to the lifting bracket.
- Always lift the pump by its lifting bracket
or by means of a forklift truck if the
pump is fixed on a pallet.
- Never lift the pump by means of the
power cable, hose or pipe.
- Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary.
DANGER
Electric shock
Death or serious personal injury
- Before starting up the product for the
first time, check the power cable for
visible defects to avoid short circuits.
- If the power cable is damaged, it must
be replaced by the manufacturer, his
service agent or a similarly qualified
person.
- Make sure that the product is earthed
properly.
- Switch off the power supply and lock the
main switch in position 0.
- Switch off any external voltage
connected to the product before working
on it.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean
water and rinse the pump parts in water
after dismantling.
Pits for submersible sewage and
wastewater pumps may contain sewage
or wastewater with toxic and/or disease-
causing substances.
- Wear appropriate personal protective
equipment and clothing.
- Observe the local hygiene regulations in
force.
CAUTION
Hot surface
Minor or moderate personal injury
- Do not touch the surface of the pump
while the pump is running.
Do not open the clamp while the pump is
running.

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4.1 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged in the pumped
liquid, the pumps can also operate continuously
(S1). See fig. 4.
Fig. 4 Operating levels
S3, intermittent operation
S3 operation is a series of 10-minute duty cycles
(TC). Each cycle has a 4-minute period of constant
load followed by a 6-minute period of rest. Thermal
equilibrium is not reached during the cycle. See fig.
5.
In this operating mode, the pump is partly
submerged in the surrounding liquid. The minimum
liquid level is at the top of the cable entry.
Fig. 5 S3 operation
S1, continuous operation
In this operating mode, the pump can operate
continuously without being stopped for cooling.
Being completely submerged, the pump is
sufficiently cooled by the surrounding liquid. See fig.
6.
Fig. 6 S1 operation
4.2 Start and stop levels
The difference in level between start and stop can be
adjusted by changing the free cable length.
Long free cable = large difference in level.
Short free cable = small difference in level.
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the upper edge of the clamp on the pump.
• Install the start level switch in such a way that the
pump is started at the required level; however,
the pump must always be started before the
liquid level reaches the bottom inlet pipe to the
pit.
Fig. 7 Start and stop levels
Do not start the pump if the atmosphere in
the pit is potentially explosive.
TM06 5749 0116TM04 4527 1509
S1
S3
Operation
Stop
P
t
TC
TM04 4528 1509
Observe the two following points.
CU 100 must not be used for Ex
applications.
TM06 5741 0116
P
t
Operation
Stop
Alarm
Start
Stop

English (GB)
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4.3 Direction of rotation
All single-phase pumps are factory-wired for the
correct direction of rotation.
Before starting up three-phase pumps, check the
direction of rotation.
An arrow on the stator housing indicate the correct
direction of rotation.
If the direction of rotation is wrong, interchange two
phases in the power cable. See fig. 2or 3.
Checking the direction of rotation
Check the direction of rotation in one of the following
ways every time the pump is connected to a new
installation.
Procedure 1:
1. Start the pump and measure the quantity of liquid
or the outlet pressure.
2. Stop the pump and interchange two phases in the
power cable.
3. Restart the pump and measure the quantity of
liquid or the outlet pressure.
4. Stop the pump.
5. Compare the results taken under points 1 and 3.
The connection which gives the larger quantity of
liquid or the higher pressure is the correct
direction of rotation.
Procedure 2:
1. Let the pump hang from a lifting device, such as
the hoist used for lowering the pump into the pit.
2. Start and stop the pump while observing the
movement (jerk) of the pump.
3. If connected correctly, the pump will jerk in the
opposite direction of the direction of rotation. See
fig. 8.
4. If the direction of rotation is wrong, interchange
two phases in the power cable. See fig. 2or 3.
Fig. 8 Jerk direction
4.4 Startup
The pump may be started for a very short
period without being submerged to check
the direction of rotation.
The impeller rotates clockwise when the
pump is viewed from above. When started,
the pump will jerk in the opposite direction
of the direction of rotation.
TM06 5811 0116
The pump must not run dry.
If the atmosphere in the pit is potentially
explosive, use only pumps with Ex
approval.
In case of abnormal noise or vibrations
from the pump, other pump failure or
power supply failure, stop the pump
immediately.
Do not attempt to restart the pump until the
cause of the fault has been found and
corrected.

English (GB)
13
Proceed as follows:
1. Remove the fuses, and check that the impeller
can rotate freely. Turn the grinder head by hand.
2. Check the condition of the oil in the oil chamber.
See also section 8.4 Oil check and oil change.
3. Check whether the monitoring units, if used, are
operating satisfactorily.
4. Check the setting of the air bells, float switches
or electrodes.
5. Open the isolating valves, if fitted.
Auto coupling: It is important to grease the
gasket of the guide claw before lowering the
pump into the pit.
6. Lower the pump into the liquid and insert the
fuses.
Auto coupling: Check that the pump is in the
right position on the auto-coupling base unit.
7. Check that the system has been filled with liquid
and vented. The pump is self-venting.
8. Switch on the power supply to the pump. When
power is on, the pump will start and pump down
to the dry-running level. This process can be
used to check that the pump functions correctly.
After one week of operation or after replacement of
the shaft seal, check the condition of the oil in the
chamber. See section 8. Servicing and maintaining
the product.
4.5 Resetting the pump
To reset the pump, switch off the power supply to the
pump for one minute, and switch it on again.
5. Handling and storing the product
5.1 Handling the product
Before handling the product, see section 3.1.1 Lifting
the product.
5.2 Storing the product
During long periods of storage, protect the pump
against moisture and heat.
After a long period of storage, inspect the pump
before putting it into operation. Make sure that the
impeller can rotate freely. Pay special attention to the
condition of the shaft seal and the cable entry.
6. Product introduction
6.1 Product description
Fig. 9 SEG pump
TM06 5740 0116
Pos. Designation
1 Cable plug
2Nameplate
3 Outlet flange DN 40 and 50
4 Outlet port
5 Lifting bracket
6 Stator housing
7Oilscrew
8 Clamp
9 Pump foot
10 Pump housing
1
2
3
4
5
6
7
8
9
10

English (GB)
14
6.2 Applications
The compact design makes the pumps suitable for
both temporary and permanent installation.
The pumps can be installed on an auto-coupling
system or stand freely on the bottom of the pit.
SEG pumps are designed with a grinder system
which grinds solid particles into small pieces so that
they can be led away through pipes of a relatively
small diameter.
SEG pumps are used in pressurised systems, e.g. in
hilly areas.
6.3 Pumped liquids
SEG pumps are designed for pumping these liquids:
• domestic wastewater with discharge from toilets
• sewage from restaurants, hotels, camping sites,
etc.
6.4 Potentially explosive environments
Use explosion-proof pumps for applications in
potentially explosive environments.
The pumps must under no circumstances
pump combustible or flammable liquids.
The classification of the installation site
must be approved according to local rules
in each individual case.
The letter X in the certificate number
indicates that the equipment is subject to
special conditions for safe use. The
conditions are mentioned in the certificate
and in these installation and operating
instructions.
Special conditions for safe use of
explosion-proof pumps:
1. Bolts used for replacement must be
class A2-70 or better according to EN/
ISO 3506-1.
2. The pump must not run dry. The level
of pumped liquid must be controlled by
two stop level switches connected to
the motor control circuit. The minimum
level depends on the installation type
and is specified in these installation
and operating instructions. The pumps
can be used in duty cycles S3, halfway
submerged, or S1, fully submerged.
3. Make sure the permanently attached
cable is suitably mechanically
protected and terminated in a suitable
terminal board placed outside the
potentially explosive area. The power
cable plug may only be disconnected
by the manufacturer or his
representative.
4. The thermal protector in the stator
windings has a rated cut-out
temperature of 150 °C guaranteeing
the disconnection of the power supply.
The power supply must be reset
manually.
5. The IP68 rating is limited to maximum
10 m submersion depth.
6. The temperature range is limited to -20
to +40 °C for ambient temperature and
0-40 °C for liquids.
7. Contact the manufacturer regarding the
"d" protection type for pumps and for
information on the dimensions of the
flameproof joints.
8. The lock nut of the cable connector
must only be replaced with an identical
one.

English (GB)
15
6.5 Approvals
The standard version of SEG pumps has been tested
by VDE The explosion-proof version of SEG has
been approved by DEKRA according to the ATEX
directive.
6.5.1 Approval standards
The standard version of SEG pumps has been
approved by Tüv Rheinland LGA according to EN
12050-1.
The explosion protection classification of the pumps
is Europe CE 0344 II 2 G Ex db llB T4 Gb.
6.5.2 Australia
For IEC countries, such as Australia and others, the explosion-proof versions have been approved by DEKRA,
certificate no IECEx DEK 18.0038X, as Ex db IIB T4 Gb according to IEC 60079-0:2017 and IEC 60079-
1:2014 or certificate no IECEx KEM 06.0127X, as Ex nC II T3 according to IEC 60079-15:1987 (corresponding
to AS 2380.9).
Directive or standard Code Description
ATEX
CE
0344 =
CE marking of conformity according to the ATEX directive 2014/34/EU.
0344 is the number of the notified body which has certified the quality
system for ATEX.
= Explosion protection marking.
II = Equipment group according to the ATEX directive, defining the
requirements applicable to the equipment in this group.
2=
Equipment category according to the ATEX directive, defining the
requirements applicable to the equipment in this category.
G = Explosive atmosphere caused by gases, vapours or mists.
Harmonised European
standard
Ex = The equipment conforms to harmonised European standard.
db = Flameproof enclosure according to EN 60079-1.
IIB = Classification of gases, see EN 60079-0.
Gas group B includes gas group A.
T4 = Maximum surface temperature is 135 °C.
Gb = Equipment for explosive gas atmospheres with "high" level of protection.
Standard Code Description
IEC 60079-15
Ex = Area classification according to AS 2430.1.
n = Non-sparking according to AS 2380.9:1991, section 3 (IEC 60079-15).
C = The environment is adequately protected against sparking components.
II = Suitable for use in explosive atmospheres (not mines).
T3 = Maximum surface temperature is 200 °C.

English (GB)
16
6.6 Identification
6.6.1 Nameplate
Fix the extra nameplate supplied with the pump at
the installation site or keep it in the cover of this
booklet.
Fig. 10 Nameplate
6.6.2 Type key
Example: SEG.40.12.Ex.2.1.502
1) Maximum frequency in case of frequency
converter operation.
2) The pumps in the individual generations differ in
design but are similar in terms of power rating.
TM05 8872 3615
Pos. Description
1 Type designation
2 Product number
3Approval
4 ATEX certificate number
5 IEC Ex description
6 IEC Ex certificate number
7 Production code, year and week
8 Enclosure class according to IEC 60529
9 Maximum head [m]
10 Rated input power [kW]
11 Rated voltage
12 Speed [rpm]
13 Net weight [kg]
14 Run capacitor [F]
15 CE mark
16 Safety instructions, publication number
17 Ex description
18 Maximum installation depth [m]
19 Maximum flow rate [l/s]
20 Rated power output [kW]
21 Maximum current [A]
22 Cos φ, 1/1 load
23 Maximum liquid temperature [°C]
24 Frequency [Hz]
25 Insulation class
26 Production country
Type:
1
16
17
18
19
20
21
22
23
24
25
26
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Model:
P. c
IP68
Hmax: Qmax:
P2:
&RVij
Tmax:
Hz
Insul.class:
Made in Tatabánya, Hungary
°C
P1:
n: min
Weight:
kW kW
kg
opr.: ȝ)
mI/s
-1
DK-8850 Bjeringbro,Denmark
See manual
Code Description Designation
SE Grundfos sewage
pumps Type range
GGrinder system in the
pump inlet Impeller type
40 Nominal diameter of
outlet port
Pump outlet [mm]
50
Nominal diameter of
the outlet port for high-
flow variants
12 P2 = code number from
type designation / 10
Output power
[kW]
[ ] Standard, without
equipment Equipment
[ ]
Standard version of
submersible
wastewater pumps
Pump version
Ex
Pump designed
according to the ATEX
standard indicated or
Australian standard,
AS 2430.1
2 2-pole Number of poles
1 Single-phase motor Number of
phases
[ ] Three-phase motor
5 50 Hz Frequency [Hz] 1)
02 230 V, DOL
Voltage and
starting method
0B 400-415 V, DOL
0C 230-240 V, DOL
[ ] 1st generation
Generation 2)
A 2nd generation
B 3rd generation
[ ] Standard material (EN-
GJL-200) Pump material
Z Custom-built pump Customisation

English (GB)
17
7. Protection and control functions
The liquid level can be controlled via the Grundfos
LC, LCD 107, LC, LCD 108, LC, CLD 110 level
controllers, and the pumps can be protected via
thermal switches or the Grundfos CU 100 control
unit.
7.1 LC and LCD level controllers
LC controllers are for one-pump installations and
LCD controllers are for two-pump installations.
The following LC and LCD level controllers are
available:
• LC 107 and LCD 107 with air bells
• LC 108 and LCD 108 with float switches
• LC 110 and LCD 110 with electrodes.
In the following description, "level switches" can be
air bells, float switches or electrodes, depending on
the level controller selected.
7.1.1 LC, LCD
Controllers for single-phase pumps incorporate
capacitors.
The LC controller has two or three level switches:
One for start and the other for stop of pump. The
third level switch, which is optional, is for high-level
alarm.
The LCD controller has three or four level switches:
One for common stop and two for start of the pumps.
The fourth level switch, which is optional, is for high-
level alarm.
When installing the level switches, observe the
following points:
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the middle of the motor housing.
• Install the start level switch in such a way that the
pump is started at the required level; however,
the pump must always be started before the
liquid level reaches the bottom inlet pipe to the
pit.
• If installed, always install the high-level alarm
switch about 10 cm above the start level switch.
However, the alarm must always be given before
the liquid level reaches the inlet pipe to the pit.
For further settings, see the installation and
operating instructions for the level controller
selected.
7.2 Thermal switches
All pumps have two sets of thermal switches
incorporated in the stator windings.
The thermal switch in circuit 1 (T1-T3) will break the
circuit at the following approximate winding
temperatures:
• 150 °C
• 125 °C for 1.5 kW, single-phase pumps.
This thermal switch must always be connected.
The thermal switch in circuit 2 (T1-T2) will break the
circuit at the following approximate winding
temperatures:
• 170 °C for three-phase pumps
• 160 °C for single-phase pumps
• 135 °C for 1.5 kW, singe-phase pumps.
The maximum operating current of the thermal
switches is 0.5 A at 500 VAC and cos φ0.6. The
switches must be able to break a coil in the supply
circuit.
When the thermal switches in standard pumps close
the circuit after cooling, the pump will be restarted
automatically by the controller.
The pump must not run dry.
Install an additional level switch to ensure
that the pump is stopped in case the stop
level switch is not operating.
The pump must be stopped when the
liquid level reaches the upper edge of the
clamp on the pump.
Float switches used in potentially
explosive environments must be approved
for this application. They must be
connected to the Grundfos DC, DCD and
LC, LCD 107, LC, LCD 108 and LC, LCD
110 level controller via an intrinsically safe
barrier to ensure a safe circuit.
After thermal cutout, explosion-proof
pumps must be restarted manually. The
thermal switch in circuit 2 must be
connected for manual restarting of these
pumps.
DANGER
Explosive environment
Death or serious personal injury
- Do not install the separate motor-
protective circuit breaker or control unit
in potentially explosive environments.

English (GB)
18
7.3 CU 100 control unit
CU 100 incorporates a motor-protective circuit
breaker and is available with level switch and cable.
Single-phase pumps
Connect a run capacitor to the control unit.
For capacitor sizes, see the table below:
7.4 Frequency converter operation
For frequency converter operation please observe
the following information.
Requirements must be fulfilled.
Recommendations ought to be followed.
Consequences must be considered.
7.4.1 Requirements
• The thermal protection of the motor must be
connected.
• Peak voltage and dU/dt must be in accordance
with the table below. The values stated are
maximum values supplied to motor terminals.
The cable influence has not been taken into
account. See data sheet for the frequency
converter used regarding the actual values and
cable influence on the peak voltage and dU/dt.
• If the pump is an Ex-approved pump, check if the
Ex certificate of the specific pump allows the use
of a frequency converter.
• Set the frequency converter U/f ratio according to
the motor data.
• Local regulations and standards must be fulfilled.
7.4.2 Recommendations
Before installing a frequency converter, calculate the
lowest allowable frequency in the installation in order
to avoid zero flow.
• Do not reduce the motor speed to less than 30 %
of rated speed.
• Keep the flow velocity above 1 m/sec.
• Let the pump run at rated speed at least once a
day in order to prevent sedimentation in the pipe
system.
• Do not exceed the frequency indicated on the
nameplate. In this case there is risk of motor
overload.
• Keep the power cable as short as possible. The
peak voltage will increase with the length of the
power cable. See data sheet for the frequency
converter used.
• Use input and output filters on the frequency
converter. See data sheet for the frequency
converter used.
• Use a screened power cable if there is a risk that
electrical noise can disturb other electrical
equipment. See data sheet for the frequency
converter used.
7.4.3 Consequences
When operating the pump via a frequency converter,
please be aware of these possible consequences:
• The locked-rotor torque will be lower. How much
lower will depend on the frequency converter
type. See the installation and operating
instructions for the frequency converter used for
information on the locked-rotor torque available.
• The working condition of bearings and shaft seal
may be affected. The possible effect will depend
on the application. The actual effect cannot be
predicted.
• The acoustic noise level may increase. See the
installation and operating instructions for the
frequency converter used for advice as to how to
reduce the acoustic noise.
Pump type CS, starting
capacitor
CR, run
capacitor
[kW] [μF] [V] [μF] [V]
0.9 and 1.2 150 230 30 450
1.5 150 230 40 450
Frequency converter operation will
influence the efficiency of the grinder
system.
Max. repetitive peak
voltage
[V]
Max. dU/dt
UN400 V
[V/μsec.]
650 2000

English (GB)
19
8. Servicing and maintaining the
product
8.1 Safety instructions and requirements
DANGER
Electric shock
Death or serious personal injury
- Before starting work on the pump, make
sure that the fuses have been removed
or the main switch has been switched
off.
- Make sure that the power supply cannot
be accidentally switched on.
CAUTION
Crushing of hands
Minor or moderate personal injury
- Do not put your hands or any tool into
the pump inlet or outlet port after the
pump has been connected to the power
supply, unless the pump has been
switched off by removing the fuses or
switching off the main switch.
- Make sure that all the rotating parts
have stopped moving.
CAUTION
Sharp element
Minor or moderate personal injury
- Avoid touching the sharp edges of the
impeller, grinder head and grinder ring
without gloves.
CAUTION
Biological hazard
Minor or moderate personal injury
- Make sure to seal the pump outlet
properly when fitting the outlet pipe,
otherwise water might spray out of the
sealing.
CAUTION
Hot surface
Minor or moderate personal injury
- Do not touch the surface while the pump
is running.
WARNING
Crushing of hands
Death or serious personal injury
- When lifting the pump, make sure your
hand is not caught between the lifting
bracket and the hook.
DANGER
Crushing hazard
Death or serious personal injury
- Make sure that the hook is fixed
properly to the lifting bracket.
- Always lift the pump by its lifting bracket
or by means of a forklift truck if the
pump is fixed on a pallet.
- Never lift the pump by means of the
power cable, hose or pipe.
- Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary.
DANGER
Electric shock
Death or serious personal injury
- Before installing the pump and starting it
up for the first time, check the power
cable for visible defects to avoid short
circuits.
- If the power cable is damaged, it must
be replaced by the manufacturer, his
service agent or a similarly qualified
person.
- Make sure that the product is earthed
properly.
- Switch off the power supply and lock the
main switch in position 0.
- Switch off any external voltage
connected to the pump before working
on it.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean
water and rinse the pump parts in water
after dismantling.
Pits for submersible sewage and
wastewater pumps may contain sewage
or wastewater with toxic and/or disease-
causing substances.
- Wear appropriate personal protective
equipment and clothing.
- Observe the local hygiene regulations in
force.
CAUTION
Pressurised system
Minor or moderate personal injury
- As pressure may have built up in the oil
chamber, do not remove the screws
until the pressure has been fully
relieved.

English (GB)
20
Before carrying out maintenance and service, flush
the pump thoroughly with clean water. Rinse the
pump parts in water after dismantling.
8.2 Contaminated pumps
The product will be classified as contaminated if it
has been used for a liquid which is injurious to health
or toxic.
If you request Grundfos to service the product,
contact Grundfos with details about the pumped
liquid before returning the product for service.
Otherwise Grundfos can refuse to accept the product
for service.
Any application for service must include details
about the pumped liquid.
Clean the product in the best possible way before
you return it.
Costs of returning the product are to be paid by the
customer.
8.3 Maintenance schedule
Inspect pumps running normal operation every 3000
operating hours or at least once a year. If the dry-
solids content of the pumped liquid is very high or
sandy, check the pump at shorter intervals.
Check the following points:
•Power consumption
See section 6.6.1 Nameplate.
•Oil level and oil condition
When the pump is new or after replacement of
the shaft seal, check the oil level after one week
of operation.
Use Shell Ondina X420 oil or similar type.
See section 8.4 Oil check and oil change.
• Cable entry
•Pump parts
Check the impeller, the pump housing, etc. for
possible wear. Replace defective parts.
See section 8.9 Service kits.
•Ball bearings
Check the shaft for noisy or heavy operation by
turning the shaft by hand. Replace defective ball
bearings.
A general overhaul of the pump is usually
required in case of defective ball bearings or poor
motor function. This work must be carried out by
Grundfos or a service workshop authorised by
Grundfos.
•Grinder system and parts
In case of frequent choke-ups, check the grinder
system for visible wear. When worn, the edges of
the grinding parts are round. Compare with a new
grinder system.
Except for service on the pump parts, all
other service work must be carried out by
Grundfos or a service workshop
authorised by Grundfos and approved for
servicing explosion-proof products.
If the pump is inactive for long periods of
time, we recommend that you check the
function of the pump.
Service videos can be found in Grundfos
Product Center at www.grundfos.com.
A possible replacement of the power cable
must be carried out by Grundfos or a
service workshop authorised by Grundfos.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean
water and rinse the pump parts in water
after dismantling.
Make sure that the cable entry is
watertight and that the cables are not
sharply bent and/or pinched.