Grundfos SL1.50 User manual

SL1.50 and SLV.65
0.9 - 1.5 kW
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
Page
1. Symbols used in this document
1. Symbols used in this document 2
2. General description 3
2.1 Product drawings 3
2.2 Applications 3
2.3 Operating conditions 4
3. Delivery and handling 4
3.1 Transportation 4
3.2 Storage 4
3.3 Lifting 4
4. Identification 5
4.1 Nameplate 5
4.2 Type key 6
5. Approvals 7
5.1 Approval standards 7
5.2 Explanation to the Ex approval 7
6. Safety 8
6.1 Potentially explosive environments 8
7. Installation 9
7.1 Installation on auto-coupling 9
7.2 Free-standing submerged installation 10
8. Electrical connection 11
8.1 Wiring diagrams 12
8.2 CU 100 control box 12
8.3 Pump controllers 13
8.4 Thermal switches 14
8.5 Frequency converter operation 14
9. Starting up the product 15
9.1 General startup procedure 15
9.2 Operating modes 15
9.3 Direction of rotation 16
10. Maintenance and service 16
10.1 Inspection 17
10.2 Adjusting the impeller clearance 17
10.3 Cleaning the pump housing 18
10.4 Checking/replacing the shaft seal 18
10.5 Oil change 19
10.6 Service kits 20
10.7 Contaminated pumps 20
11. Fault finding 21
12. Technical data 22
13. Disposal 22
Warning
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local
regulations and accepted codes of good
practice.
Warning
The use of this product requires
experience with and knowledge of the
product.
Persons with reduced physical, sensory or
mental capabilities must not use this
product, unless they are under supervision
or have been instructed in the use of the
product by a person responsible for their
safety.
Children must not use or play with this
product.
Warning
If these safety instructions are not
observed, it may result in personal injury.
Warning
If these instructions are not observed, it
may lead to electric shock with consequent
risk of serious personal injury or death.
Warning
These instructions must be observed for
explosion-proof pumps. We recommend
that you also follow these instructions for
standard pumps.
Caution
If these safety instructions are not
observed, it may result in malfunction or
damage to the equipment.
Note
Notes or instructions that make the job
easier and ensure safe operation.

English (GB)
3
2. General description
This booklet includes instructions for installation,
operation and maintenance of Grundfos SL1 and
SLV submersible wastewater pumps. Grundfos SL1
and SLV pumps are portable and designed for
pumping domestic and industrial sewage and
wastewater.
Two types of pumps are available:
• SL1.50.65 sewage pumps with single-channel
impeller
• SLV.65.65 sewage pumps with SuperVortex, free-
flow impeller.
The pumps can be installed on an auto-coupling
system or stand freely on the bottom of a pit.
The pumps can be controlled via the Grundfos LC,
LCD 107, LC, LCD 108, LC, LCD 110 pump
controllers or the Grundfos CU 100 control box. See
installation and operating instructions for the
selected controller.
2.1 Product drawings
Fig. 1 SL1.50.65 and SLV.65.65 pumps
Fig. 2 SLV.65.65 pump
2.2 Applications
SL1.50.65 pumps are designed for pumping these
liquids:
• large quantities of drainage and surface water
• domestic wastewater with discharge from toilets
• wastewater from commercial buildings without
discharge from toilets
• sludge-containing industrial wastewater
• industrial process water.
SLV.65.65 pumps are designed for pumping these
liquids:
• surface water with abrasive particles
• municipal sewage
• sewage from commercial buildings
• sludge- or fibre-containing industrial wastewater.
The compact design makes the pumps suitable for
both temporary and permanent installation.
TM06 5918 0316TM06 5937 0316
3
9
1
2
5
6
7
8
4
3
9
1
2
5
6
7
8
4
Pos. Description
1 Cable plug
2 Nameplate
3 Outlet port
4 Outlet flange DN 65, PN 10
5 Lifting bracket
6 Stator housing
7 Oil screw
8Clamp
9 Pump housing

English (GB)
4
2.3 Operating conditions
The SL1, SLV pumps are designed for intermittent
operation (S3). When completely submerged in the
pumped liquid, the pumps can also operate
continuously (S1). See section 9.2 Operating modes.
Installation depth
Maximum 10 metres below liquid level.
Operating pressure
Maximum: 6 bar.
Intermittent operation
Maximum 30 starts per hour.
pH value
Pumps in permanent installations can be used for
pumping liquids with a pH value between 4 and 10.
Liquid temperature
0-40 °C.
For short periods (maximum 15 minutes) a
temperature of up to 60 °C is permissible (non-Ex
versions only).
Density of pumped liquid
When pumping liquids with a density and/or a
kinematic viscosity higher than that of water, use
motors with correspondingly higher outputs.
3. Delivery and handling
The pump may be transported and stored in a
vertical or horizontal position. Make sure that it
cannot roll or fall over.
3.1 Transportation
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 pump nameplate.
The polyurethane-embedded plug prevents water
from penetrating into the motor via the motor cable.
3.2 Storage
During long periods of storage, protect the pump
against moisture and heat.
After a long period of storage, the pump must be
inspected before it is put into operation. Make sure
that the impeller can rotate freely. Pay special
attention to the condition of the shaft seal and the
cable entry.
3.3 Lifting
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. 3.
Fig. 3 Lifting points
Warning
Explosion-proof pumps must never pump
liquids with a temperature higher than 40
°C.
Warning
Always lift the pump by its lifting bracket or
by means of a fork-lift truck if the pump is
fixed to a pallet. Never lift the pump by
means of the motor cable or the hose/pipe.
TM06 0066 4813

English (GB)
5
4. Identification
4.1 Nameplate
The nameplate states the operating data and approvals applying to the pump. The nameplate is fixed with
rivets to the side of the stator housing close to the cable entry.
Fit the additional nameplate supplied with the pump close to the pit.
Fig. 4 Nameplate
* For Russia only.
** For Australia only.
TM05 8872 3615
98807792
Pos. Description Pos. Description
1 Type designation 15 Run capacitor [μF]
2 Product number 16 RCM logo**
3 Approval 17 CE mark
4 ATEX certificate number 18 Installation and operating instructions,
publication number
5 IEC Ex description 19 Ex description
6 IEC Ex certificate number 20 Maximum installation depth [m]
7 Production code (year/week) 21 Maximum flow rate [l/s]
8 Enclosure class to IEC 22 Rated power output [kW]
9 Maximum head [m] 23 Maximum current [A]
10 Rated input power [kW] 24 Cos φ, 1/1 load
11 Rated voltage 25 Maximum liquid temperature [°C]
12 Speed [rpm] 26 Frequency [Hz]
13 Net weight [kg] 27 Insulation class
14 EAC approval* 28 Production country

English (GB)
6
4.2 Type key
Please note that not all combinations are available.
Code Example SL 1 50 .65 .11 .EX .2 .1 .5 02
SL
Pump type
Grundfos sewage/wastewater pumps
1
V
Impeller type
Single-channel impeller
Free-flow impeller (SuperVortex)
50
Pump passage
Maximum solids size [mm]
50 mm
65
Pump outlet
Nominal diameter of pump outlet port [mm]
65 mm
11
Output power, P2
P2 = Code from type designation/10 [kW]
1.1 kW
[ ]
A
Equipment
Standard (without equipment)
Pump equipped with a control box CU 100
[ ]
EX
Pump version
Standard version of submersible sewage/wastewater pump
Pump designed to the ATEX standard indicated or Australian standard, AS
2430.1
2
Number of poles
2 poles
1
[ ]
Number of phases
Single-phase motor
Three-phase motor
5
Mains frequency
50 Hz
02
0B
0C
Voltage and starting method
230 V, direct-on-line starting
400-415 V, direct-on-line starting
230-240 V, direct-on-line starting
[ ]
A
B
Generation
1st generation
2nd generation
3rd generation, etc
The pumps belonging to the individual generations differ in design but are similar in terms of power
rating.
[ ]
Materials in pump
Standard materials in pump

English (GB)
7
5. Approvals
5.1 Approval standards
The standard versions of SL1 and SLV pumps have been tested by VDE and approved by LGA (notified body
under the Construction Products Directive) according to EN 12050-1 or EN 12050-2 as specified on the pump
nameplate.
5.2 Explanation to the Ex approval
The explosion-proof versions have been approved by KEMA according to the ATEX directive. The explosion
protection classification of the pump is CE 0344 Ex II 2 G Ex d IIB T4 X.
5.2.1 Australia
Ex variants for Australia are approved as Ex nC II T3 X according to IEC 79-15 (corresponding to AS 2380.9).
Directive/
standard Code Description
ATEX
CE
0344 =
CE marking of conformity according to the ATEX directive 94/9/EC, Annex X.
0344 is the number of the notified body which has certified the quality system
for ATEX.
= Marking of explosion protection
II = Equipment group according to the ATEX directive, Annex II, point 2.2, defining
the requirements applicable to the equipment in this group.
2=
Equipment category according to the ATEX directive, Annex II, point 2.2,
defining the requirements applicable to the equipment in this category.
G = Explosive atmosphere caused by gases, vapours or mists.
Harmonized
European
standard
Ex = The equipment conforms to harmonized European standard.
d = Flame-proof enclosure according to EN 60079-1:2007.
II = Suitable for use in explosive atmospheres (not mines.)
B=
Classification of gases, see EN 60079-0:2006, Annex A. Gas group B includes
gas group A.
T4 = Maximum surface temperature is 135 °C.
X=
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 the installation and operating instructions.
Standard Code Description
IEC 79-15:1987
Ex = Area classification according to AS 2430.1.
n = Non-sparking according to AS 2380.9:1991, section 3 (IEC 79-15:1987).
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.
X=
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 the installation and operating instructions.

English (GB)
8
6. Safety
For safety reasons, all work in pits must be
supervised by a person outside the pump pit.
Pits for submersible sewage and wastewater pumps
may contain sewage or wastewater with toxic and/or
disease-causing substances. Therefore, all persons
involved must wear appropriate personal protective
equipment and clothing, and all work on and near the
pump must be carried out under strict observance of
the hygiene regulations in force.
6.1 Potentially explosive environments
Use explosion-proof pumps for applications in
potentially explosive environments.
Warning
The use of this product requires
experience with and knowledge of the
product.
Persons with reduced physical, sensory or
mental capabilities must not use this
product, unless they are under supervision
or have been instructed in the use of the
product by a person responsible for their
safety.
Children must not use or play with this
product.
Warning
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.
Warning
Persons must not enter the installation
area when the atmosphere is explosive.
Warning
It must be possible to lock the mains
switch in position 0.
Type and requirements as specified in EN
60204-1, 5.3.2.
Warning
When the pump has been installed, there
must be at least 3 m free cable above the
maximum liquid level.
Note
We recommend that you carry out all
maintenance and service work when the
pump is placed outside the pit.
Warning
Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary. Carelessness
during lifting or transportation may cause
injury to personnel or damage to the pump.
Warning
The pumps must under no circumstance
pump combustible or flammable liquids.
Warning
The explosion protection classification of
the pumps is CE Ex II 2 G, Ex d IIB T4 X.
The classification of the installation site
must be approved by the local fire-fighting
authorities in each individual case.
Special conditions for safe use of SL1 and
SLV explosion-proof pumps:
1. Bolts used for replacement must be
class A2-70 or better according to EN/
ISO 3506-1.
2. 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.
3. Make sure the permanently attached
cable is suitably mechanically
protected and terminated in a suitable
terminal board placed outside the
potentially explosive area.
4. The thermal protection in the stator
windings has a nominal cut-out
temperature of 150 °C guaranteeing
the disconnection of the power supply;
the resetting of the supply is manual.

English (GB)
9
7. 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.
Prior to installation, check the oil level in the oil
chamber. See section 10. Maintenance and service.
The pumps are suitable for different installation types
which are described in sections 7.1 Installation on
auto-coupling and 7.2 Free-standing submerged
installation.
The pump housings have a cast iron DN 65, PN 10
outlet flange.
7.1 Installation on auto-coupling
Pumps for permanent installation can be installed on
a stationary auto-coupling guide rail system. See fig.
A, page 23.
The auto-coupling system facilitates maintenance
and service as the pump can easily be lifted out of
the pit.
Auto-coupling guide rail system
See fig. A, page 23.
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 screws.
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 expansion 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. Place the guide rails on 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.
Caution
Prior to installation, make sure the pit
bottom is even.
Warning
Before beginning the installation, switch off
the power supply and lock the mains
switch in position 0.
Any external voltage connected to the
pump must be switched off before working
on the pump.
Warning
Prior to installation and the first startup of
the pump, check the cable for visible
defects to avoid short-circuits.
Note
The pumps are designed for intermittent
operation. When completely submerged in
the pumped liquid, the pumps can also
operate continuously. See section
12. Technical data.
Warning
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
mains switch. Make sure that the power
supply cannot be accidentally switched on.
Caution
We recommend that you always use
Grundfos accessories to avoid malfuncion
due to incorrect installation.
Warning
Only use the lifting bracket for lifting the
pump. Do not use it to hold the pump when
in operation.
Warning
Before beginning installation procedures,
make sure that the atmosphere in the pit is
not potentially explosive.
Note
Make sure that the pipework is installed
without the use of undue force. No loads
from the pipework weight must be carried
by the pump. We recommend that you use
loose flanges to ease the installation and
to avoid pipe tension at flanges and bolts.
Note
Do not use elastic elements or bellows in
the pipework. Never use these elements
as a means to align the pipework.
Note
The guide rails must not have any axial
play as this would cause noise during
pump operation.

English (GB)
10
6. Clean out debris from the pit before lowering the
pump into the pit.
7. Fit the guide claw to the pump outlet.
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 motor 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 cables are not sharply bent or
pinched.
11. Connect the motor cable and the monitoring
cable, if any.
7.2 Free-standing submerged installation
Pumps for free-standing submerged installation can
stand freely on the bottom of the pit or similar
location. See fig. B, page 24.
In order to facilitate service on the pump, fit a flexible
union or coupling to the elbow on 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 pump 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 to support the pump
on bricks or a similar support.
Proceed as follows:
1. Fit a 90 ° elbow to the pump outlet and connect
the outlet pipe/hose.
2. Lower the pump into the liquid by means of a
chain secured to the lifting bracket of the pump.
We recommend to place the pump on a plane,
solid foundation. Make sure that the pump is
hanging from the chain and not the 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 motor 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. Make sure that the
cables are not sharply bent or pinched.
5. Connect the motor cable and the monitoring
cable, if any.
Note
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.
Note
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.
Note
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)
11
8. Electrical connection
Warning
Connect the pump to an external mains
switch ensuring all-pole disconnection with
a contact separation according to EN
60204-1, 5.3.2.
It must be possible to lock the mains
switch in position 0. Type and
requirements as specified in EN 60204-1,
5.3.2.
The electrical connection must be carried
out in accordance with local regulations.
Warning
Connect the pumps to a control box with a
motor protection relay with IEC trip class
10 or 15.
Warning
The permanent installation must be fitted
with an earth leakage circuit breaker
(ELCB) with a tripping current < 30 mA.
Warning
When the pump has been installed, there
must be at least 3 m free cable above the
maximum liquid level.
Warning
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.
Warning
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the free
end of the power cable in potentially
explosive environments.
The explosion protection classification of
the pumps is CE Ex II 2 G, Ex d IIB T4 X.
The classification of the installation site
must be approved by the local fire-fighting
authorities in each individual case.
On explosion-proof pumps, make sure that
an external earth conductor is connected
to the external earth terminal on the pump
using a conductor with a secure cable
clamp. Clean the surface of the external
earth connection and mount 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.
Warning
If the supply cable is damaged, it must be
replaced by the manufacturer, his service
agent or a similarly qualified person.
Caution
Set the motor-protective circuit breaker to
the rated current of the pump. The rated
current is stated on the pump nameplate.
Warning
If the pump has an Ex mark on the
nameplate, make sure that the pump is
connected in accordance with the
instructions given in this booklet.

English (GB)
12
The supply voltage and frequency are marked on the
pump nameplate. The voltage tolerance must be
within - 10 %/+ 6 % of the rated voltage. 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 box with motor-protective circuit
breaker, such as Grundfos CU 100 control box
• a Grundfos LC, LCD 107, LC, LCD 108 or LC,
LCD 110 pump controller.
See fig. 5or 6and the installation and operating
instructions for the selected control box or pump
controller.
In potentially explosive environments you have two
options:
• Use float switches made for 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 8.4 Thermal switches.
8.1 Wiring diagrams
Fig. 5 Wiring diagram for single-phase pumps
Fig. 6 Wiring diagram for three-phase pumps
8.2 CU 100 control box
The CU 100 control box incorporates a motor-
protective circuit breaker and is available with level
switch and cable.
Single-phase pumps
A run capacitor must be connected to the control
box.
For capacitor size, see the table:
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.
Warning
Before installation and the first startup of
the pump, check the cable visually to avoid
short circuits.
Caution
A possible replacement of the cable must
be carried out by Grundfos or a service
workshop authorised by Grundfos.
TM02 5587 4302
150˚C160˚C
PE 123 645
1
T3T2 T1
LN
PE
TM02 5588 3602
Pump type
Run capacitor
[μF] [V]
SL1 and SLV 30 450
Note
Observe the two following points.
Warning
The CU 100 control box must not be used
for Ex applications. See section 8.3 Pump
controllers.
150˚C170˚C
PE 123 645
3
T3T2 T1
L1
PE L2 L3

English (GB)
13
Fig. 7 Start and stop levels
8.3 Pump controllers
The following LC and LCD pump controllers are
available:
LC controllers are for one-pump-installations and
LCD controllers are for two-pump-installations.
• 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 pump controller selected.
Controllers for single-phase pumps incorporate
capacitors.
The LC controller is fitted with 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 is fitted with 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 stator 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 information, see the installation and
operating instructions for the pump controller
selected.
Warning
The pump must not run dry.
An additional level switch must be installed
to ensure that the pump is stopped in case
the stop level switch is not operating. See
fig. 7.
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 or
LC, LCD 108 pump controller via an
intrinsically safe barrier to ensure a safe
circuit.
TM06 5919 0316
Start
Stop
Alarm
Additional
stop
Warning
The pump must not run dry.
An additional level switch must be installed
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 or
LC, LCD 108 pump controller via an
intrinsically safe barrier to ensure a safe
circuit.

English (GB)
14
8.4 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 a winding temperature of approx. 150 °C.
The thermal switch in circuit 2 (T1-T2) will break the
circuit at a winding temperature of approx. 170 °C
(three-phase pumps) or 160 °C (single-phase
pumps).
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.
In the case of standard pumps, both thermal
switches can (when closing the circuit after cooling)
generate automatic restarting of the pump via the
controller.
8.5 Frequency converter operation
For frequency converter operation please observe
the following information.
Requirements must be fulfilled.
Recommendations ought to be fulfilled.
Consequences should be considered.
8.5.1 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 frequency converter.
• Set the frequency converter U/f ratio according to
the motor data.
• Local regulations/standards must be fulfilled.
8.5.2 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
piping system.
• Do not exceed the frequency indicated on the
nameplate. In this case there is risk of motor
overload.
• Keep the motor cable as short as possible. The
peak voltage will increase with the length of the
motor 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 screened motor cable if there is a risk that
electrical noise can disturb other electrical
equipment. See data sheet for the frequency
converter used.
8.5.3 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.
Note
This thermal switch must be connected for
all pumps.
Warning
After thermal cutout, explosion-proof
pumps must be restarted manually. The
thermal switch (circuit 2) must be
connected for manual restarting of these
pumps.
Warning
Do not install the separate motor-
protective circuit breaker/control box in
potentially explosive environments.
Max. repetitive peak
voltage
[V]
Max. dU/dt
UN400 V
[V/μsec.]
650 2000

English (GB)
15
9. Starting up the product
9.1 General startup procedure
Proceed as follows:
1. Remove the fuses and check that the impeller
can rotate freely. Turn the impeller by hand.
2. Check the condition of the oil in the oil chamber.
See also section 10.5 Oil change.
3. Check that 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.
6. Lower the pump into the liquid and insert the
fuses.
7. Check whether the system has been filled with
liquid and vented. The pump is self-venting.
8. Start the pump.
After one week of operation or after replacement of
the shaft seal, check the condition of the oil in the
chamber. See section 10. Maintenance and service
for procedure.
9.2 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 8 Operating levels
•S3, intermittent operation
S3 operation is a series of identical duty cycles
(TC) each with a constant load for a period,
followed by a rest period. Thermal equilibrium is
not reached during the cycle. See fig. 9.
Fig. 9 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. 10.
Fig. 10 S1 operation
Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched off.
Make sure that the power supply cannot
be accidentally switched on.
Make sure that all protective equipment
has been connected correctly.
The pump must not run dry.
Warning
If the atmosphere in the pit is potentially
explosive, use only pumps with Ex
approval.
Warning
Opening the clamp while the pump is
running can lead to personal injury or
death.
Caution
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 the
fault corrected.
TM06 5912 0316TM04 4527 1509TM04 4528 1509
S1
S3
Operation
Stop TC
P
t
P
t
Operation
Stop

English (GB)
16
9.3 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 indicates the correct
direction of rotation.
If the direction of rotation is wrong, interchange any
two of the phases in the power supply cable. See fig.
5or 6.
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 check the flow of liquid or the
outlet pressure.
2. Stop the pump and interchange any two of the
phases in the power supply cable.
3. Restart the pump and check 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, e.g. 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. 11.
4. If the direction of rotation is wrong, interchange
any two of the phases in the power supply cable.
See fig. 5or 6.
Fig. 11 Jerk direction
10. Maintenance and service
Before carrying out maintenance and service, make
sure that the pump has been thoroughly flushed with
clean water. Rinse the pump parts in water after
dismantling.
Note
The pump may be started for a very short
period without being submerged to check
the direction of rotation.
Note
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 6065 0316
Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched off.
Make sure that the power supply cannot
be accidentally switched on.
All rotating parts must have stopped
moving.
Warning
Except for service on the pump parts, all
other service work must be carried out by
Grundfos or a service workshop
authorized by Grundfos and approved for
servicing explosion-proof products.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove the
screws until the pressure has been fully
relieved.
Note
If the pump is inactive for long periods of
time, we recommend that you check the
function of the pump.
Note
Service videos can be found in Grundfos
Product Center at www.grundfos.com.

English (GB)
17
10.1 Inspection
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 4.1 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 10.5 Oil change.
The oil chamber of all pump models holds 0.17
litre.
•Cable entry
Make sure that the cable entry is watertight and
that the cables are not sharply bent and/or
pinched. See section 10.6 Service kits.
•Pump parts
Check impeller, pump housing, etc. for possible
wear. Replace defective parts. See section
10.6 Service kits.
•Ball bearings
Check the shaft for noisy or heavy operation (turn
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
authorized by Grundfos.
10.2 Adjusting the impeller clearance
The SLV pumps (SuperVortex) with semi-open
impeller do not need impeller adjustment.
SL1 pumps
For position numbers, see page 32.
Proceed as follows:
1. Loosen the locking screws (pos. 188b).
2. Loosen the adjusting screws (pos. 189) and push
the wear plate (pos. 162) until it touches the
impeller.
3. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then loosen all
the adjusting screws about half a turn.
4. Tighten the locking screws.
5. Rotate the impeller by hand to check that it is not
touching the wear plate. See also section
10.3 Cleaning the pump housing.
Fig. 12 Pump viewed from inlet side
Note
Used oil must be disposed of in
accordance with local regulations.
Note
Make sure the impeller can rotate freely
without touching the wear plate.
TM06 6058 0316

English (GB)
18
10.3 Cleaning the pump housing
For position numbers, see page 32 or 33.
Proceed as follows:
Dismantling
1. Stand the pump upright.
2. Loosen and remove the clamp (pos. 92) joining
pump housing and motor.
3. Lift the motor part out of the pump housing (pos.
50). As the impeller is fastened to the shaft end,
the impeller will be removed together with the
motor part.
4. Clean the pump housing and the impeller.
Assembly
1. Place the motor part with impeller in the pump
housing.
2. Fit and tighten the clamp.
See also section 10.4 Checking/replacing the shaft
seal.
10.4 Checking/replacing the shaft seal
To make sure that the shaft seal is intact, check the
oil.
If the oil contains more than 20 % water, the shaft
seal is defective and must be replaced. If the shaft
seal is not replaced, the motor will be damaged.
If the oil is clean, it can be reused. See also section
10. Maintenance and service.
For position numbers, see page 32 or 33.
Proceed as follows:
1. Loosen and remove the clamp (pos. 92) holding
the pump housing and the motor together.
2. Lift the motor part out of the pump housing (pos.
50). As the impeller is fastened to the shaft end,
the impeller will be removed together with the
motor part.
3. Remove the screw (pos. 188a) from the shaft
end.
4. Remove the impeller (pos. 49) from the shaft.
5. Drain the oil from the oil chamber. See section
10.5 Oil change.
The shaft seal is a complete unit for all pumps.
6. Remove the screws (pos. 188a) securing the
shaft seal (pos. 105).
7. Lift the shaft seal (pos. 105) out of the oil
chamber using the lever principle, the two
dismounting holes in the shaft seal carrier (pos.
58) and two screwdrivers.
8. Check the condition of the bush (pos. 103) where
the secondary seal of the shaft seal touches the
bush. The bush must be intact.
If the bush is worn and must be replaced, the
pump must be checked by Grundfos or a service
workshop authorized by Grundfos.
If the bush is intact, proceed as follows:
1. Check and clean the oil chamber.
2. Lubricate the faces in contact with the shaft seal
with oil.
3. Insert the new shaft seal (pos. 105) using the
plastic bush included in the kit.
4. Tighten the screws (pos. 188a) securing the shaft
seal to 16 Nm.
5. Fit the impeller. Make sure that the key (pos. 9a)
is fitted correctly.
6. Fit and tighten the screw (pos. 188a) securing
the impeller to 22 Nm.
7. Place the motor part with impeller in the pump
housing (pos. 50).
8. Fit and tighten the clamp (pos. 92).
9. Fill the oil chamber with oil. See section 10.5 Oil
change.
For adjustment of impeller clearance, see section
10.2 Adjusting the impeller clearance.
Note
Used oil must be disposed of in
accordance with local regulations.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove the
screws until the pressure has been fully
relieved.

English (GB)
19
10.5 Oil change
Every 3000 operating hours or once a year, change
the oil in the oil chamber as described below.
If the shaft seal has been changed, the oil must be
changed as well. See section 10.4 Checking/
replacing the shaft seal.
Draining of oil
1. Loosen and remove both oil screws to allow all
the oil to drain from the chamber.
2. Check the oil for water and impurities. If the shaft
seal has been removed, the oil will give a good
indication of the condition of the shaft seal.
Oil filling, pump lying down
See fig. 13
1. Place the pump in such a position that it is lying
on the stator housing and the outlet flange with
the oil screws pointing upwards.
2. Fill oil into the oil chamber through the upper hole
until it starts running out of the lower hole. The oil
level is now correct.
For oil quantity, see section 10.1 Inspection.
3. Fit both oil screws using the packing material
included in the kit.
See section 10.6 Service kits.
Fig. 13 Oil filling holes
Oil filling, pump in upright position
1. Place the pump on a plane, horizontal surface.
2. Fill oil into the oil chamber through one of the
holes until it starts running out of the other hole.
For oil quantity, see section 10.1 Inspection.
3. Fit both oil screws using the packing material
included in the kit. See section 10.6 Service kits.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove the
screws until the pressure has been fully
relieved.
Note
Used oil must be disposed of in
accordance with local regulations.
TM06 5911 0316
Oil filling
Oil level

English (GB)
20
10.6 Service kits
The following service kits are available for all pumps.
10.7 Contaminated pumps
If you request Grundfos to service the pump, contact
Grundfos with details about the pumped liquid, etc.
before returning the pump for service. Otherwise
Grundfos can refuse to accept the pump for service.
Possible costs of returning the pump must be paid by
the customer.
However, any application for service (no matter to
whom it may be made) must include details about
the pumped liquid if the pump has been used for
liquids which are injurious to health or toxic.
The pump must be cleaned in the best possible way
before it is returned.
Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched off.
Make sure that the power supply cannot
be accidentally switched on.
All rotating parts must have stopped
moving.
Service kit Contents Pump type Material Product
number
Shaft seal kit Shaft seal complete All BQQP 96106536
All BQQV 96645161
O-ring kit O-rings and gaskets for oil screws All NBR 96115107
All FKM 96646049
Impeller Impeller complete with adjusting screw, shaft
screw and key
SL1.50.65.09 96115096
SL1.50.65.11 96115097
SL1.50.65.15 96115098
SLV.65.65.09 96115110
SLV.65.65.11 96115099
SLV.65.65.15 96115100
Oil
1 litre of oil, type Shell Ondina X420. See
section 10. Maintenance and service for
required quantity in oil chamber.
All types 96586753
Lifting bracket Lifting bracket and screw 0.9 - 1.5 kW 96984147
2.6 kW 96984148
Note
A possible replacement of the cable must
be carried out by Grundfos or a service
workshop authorized by Grundfos. Warning
If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified as contaminated.