Grundfos SL1 Series User manual

SL1 and SLV pumps
1.1 - 11 kW, 50/60 Hz DIN
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Installation and operating instructions in other
languages for 50/60 Hz
net.grundfos.com/qr/i/96771279

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe Grundfos SL1/SLV 1.1 - 11 kW pumps.
CONTENTS
Page
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. General information 2
1.1 Hazard statements 2
1.2 Notes 3
1.3 Target groups 3
2. Product introduction 3
2.1 Product description 3
2.2 Pumped liquids and intended use 3
2.3 Operating conditions 4
2.4 Identification 5
2.5 Approvals 7
3. Receiving the product 8
3.1 Transporting the product 8
3.2 Handling and lifting the product 8
4. Safety 9
4.1 Potentially explosive environments 9
5. Mechanical installation 10
5.1 Installation types 10
5.2 Torques for inlet and outlet flanges 12
6. Electrical connection 13
6.1 Wiring diagrams 15
6.2 Pump controllers 19
6.3 Thermal switch, Pt1000 and PTC
thermistor 19
6.4 WIO sensor (water-in-oil sensor) 19
6.5 Moisture switch 20
6.6 IO 113 20
6.7 Frequency converter operation 21
7. Startup 22
7.1 General startup procedure 22
7.2 Operating modes 22
7.3 Direction of rotation 23
8. Servicing the product 24
8.1 Maintenance 25
8.2 Dismantling the pump 25
8.3 Assembling the pump 28
8.4 Oil quantities 30
8.5 Service kits 30
8.6 Contaminated pumps 30
9. Storage 30
10. Fault finding 31
11. Technical data 33
12. Disposal 33
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.
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.

English (GB)
3
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
1.3 Target groups
These installation and operating instructions are
intended for professional installers.
2. Product introduction
2.1 Product description
This booklet includes instructions for installation,
operation and maintenance of Grundfos SL1 and
SLV submersible sewage and wastewater pumps
with motors of 1.1 to 11 kW. Grundfos SL1 and SLV
sewage and wastewater pumps are designed for
pumping domestic, municipal and industrial sewage
and wastewater.
Two types of pumps are available:
• SL1 sewage pumps with S-tube impeller
• SLV 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 tank.
Grundfos SL1 and SLV pumps are designed with S-
tube or SuperVortex impellers to ensure reliable and
optimum operation.
The booklet also includes specific instructions for the
explosion-proof pumps.
Fig. 1 SL1 pump
2.2 Pumped liquids and intended use
SL1 and SLV pumps are designed for pumping these
liquids:
• large quantities of drainage and surface water
• domestic wastewater with discharge from toilets
• wastewater with a high content of fibres
(SuperVortex impeller)
• municipal and commercial sewage and
wastewater.
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.
TM04 2648 2808
Pos. Description
1 Lifting bracket
2 Nameplate
3Oil screws
4 Outlet flange
5 Cable plug
6Clamp
7 Pump housing
1
5
2
6
4
3
7

English (GB)
4
2.3 Operating conditions
SL1 and SLV pumps are suitable for the following
operating situations:
•S1 operation (continuous operation), the pump
must always be covered by the pumped liquid to
the top of the motor. See fig. 2.
•S3 operation (intermittent operation), the pump
must always be covered by the pumped liquid up
to the top of the cable entry. See fig. 2.
For further information about S1 and S3 operation,
see section 7.2 Operating modes.
Fig. 2 Stop levels
pH values
SL1 and SLV pumps in permanent installations can
be used for pumping liquids with the following pH
values:
1) For fluctuating pH values, the range is pH 4 to
14.
Liquid temperature
0-40 °C
For non-explosion-proof pumps, a temperature of up
to 60 °C is permissible for short periods (maximum 3
minutes).
Ambient temperature
-20 to +40 °C
For non-explosion-proof pumps, the ambient
temperature may exceed +40 °C for a short period
(maximum 3 minutes).
Density and viscosity 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.
TM04 2649 2808
Pump
type
Material
variant Material pH value
SL1/SLV Standard
Cast-iron
impeller and
pump housing
6.5-141)
SLV Q
Stainless-steel
impeller and
cast-iron pump
housing
6-141)
S1 operation
S3 operation
Explosion-proof pumps must never pump
liquids of a temperature higher than +40
°C.
For explosion-proof pumps, the ambient
temperature on the installation site must
be in the range from -20 °C to +40 °C.
For explosion-proof pumps with WIO
sensor, the ambient temperature on the
installation site must be in the range from
0-40 °C.
Flow
velocity
Keep a minimum flow velocity to
avoid sedimentations in the piping
system. Recommended flow
velocities:
• in vertical pipes: 0.7 m/s
• in horizontal pipes: 1.0 m/s.
Free
spherical
passage
From 50 to 100 mm, depending on
pump size.
Operating
mode Maximum 20 starts per hour.

English (GB)
5
2.4 Identification
Nameplate
The nameplate states the operating data and
approvals applying to the pump. The nameplate is
fitted to the side of the motor housing close to the
cable entry.
Fix the extra nameplate supplied with the pump to
the cable end in the control cabinet.
Fig. 3 Nameplate
TM07 5414 3919
Type: SLV.80.80.110.EX.2.51D
Model: 9687208500000001
P.c. 0845 IP68
44.9 90
40
12.5 11.0
2950 0.89
50
0197
180
22.4-20.8
380-415
3 ~
20 m
Hmax:
Motor:
P1:
Qmax:
Tmax.:
n:
kg
min
kW
V
A
mmh/
3
C
kW
P2:
-1
V
A
Hz Insul.class:
Weight:EN 12050-1
Made in Tatabanya, Hungary
98808079
96771279
3
5
6
910
12
8
7
11
17
15
19
13 14
16
22
24
21
23
4
1
2
18
20
25
H
CE0344 II2G
KEMA 08ATEX 0125X
Ex db h llB T4,T3 Gb
&RVij
DK-8850 Bjerringbro, Denmark
Pos. Description
1Approvals
2 Explosion protection certificate No.
3 Ex description
4 Type designation
5 Model number
6 Production code (year and week)
7 Enclosure class to IEC
8 Maximum installation depth
9 Maximum head
10 Maximum flow rate
11 Number of phases
12 Maximum liquid temperature
13 Rated input power
14 Shaft power
15 Rated speed
16 Power factor
17 Rated voltage, D
18 Rated current, D
19 Rated voltage, Y
20 Rated current, Y
21 Frequency
22 Insulation class
23 Construction Products Regulation standard
24 Weight without cable
25 Country of production

English (GB)
6
Type key
The pump can be identified by the type designation
stated on the pump nameplate. Example:
SLV.80.80.40.A.Ex.4.50.0D.Q
* Maximum frequency in case of frequency
converter operation
Code Designation Explanation
SL Pump type Grundfos wastewater
pump
1Impeller type S-tube impeller
V SuperVortex impeller
50
Free spherical
passage [mm] Maximum solids size
65
80
100
65
Pump outlet
[mm]
Nominal diameter of
pump outlet
80
100
150
40 Power [kW] Output power P2/10
Blank Sensor version Standard version
A Sensor version
Blank Pump version
Non-explosion-proof
version
Ex Explosion-proof version
2Number of
poles
2-pole
4 4-pole
50
60 Frequency [Hz]* 50 Hz 60 Hz
0B
Voltage and
starting method
3 x 400-415 V, direct-
on-line connection
0D 3 x 380-415 V, direct-
on-line connection
1D 3 x 380-415 V, star-
delta connection
0E 3 x 220-240 V, direct-
on-line connection
1E 3 x 220-240 V, star-
delta connection
0F 3 x 220-277 V, star-
delta connection
0G 3 x 380-480 V, star-
delta connection
1F
3 x 220-277 V, delta /
380-480 V star
connection
1G 3 x 380-480 V, star-
delta connection
Blank
Generation
1st generation
A 2nd generation
B 3rd generation
C 4th generation
Blank
Pump materials
Cast-iron impeller,
pump housing and
motor housing
Q
Stainless-steel impeller,
cast-iron pump housing
and motor housing
Blank Customisation Pump in standard range
Z Custom-built pump
Code Designation Explanation

English (GB)
7
2.5 Approvals
SL1 and SLV pumps have been tested by Dekra /
KEMA. The explosion-proof version hold two
examination certificates:
• ATEX(EU): KEMA08ATEX0125X
• IECEx: IECEx KEM08.0039X
Both certificates have been issued by Dekra.
Approval standards
SL1 and SLV pumps have the following explosion
protection classifications:
ATEX:
IECEx: IEC 60079-0:2017, IEC 60079-1:2014, IEC 60079-7:2017, IEC 60079-18:2017
2.5.1 Europe
The standard variants are approved by TÜV LGA (notified body under the Construction Products Directive)
according to EN 12050-1 or EN 12050-2 as specified on the pump nameplate.
Direct-drive pump without sensor: CE 0344 II 2 G Ex db h IIB T4 Gb
Direct-drive pump with sensor: CE 0344 II 2 G Ex db eb h mb IIB T4 Gb
Pump driven by frequency converter without sensor: CE 0344 II 2 G Ex db h IIB T3 Gb
Pump driven by frequency converter with sensor: CE 0344 II 2 G Ex db eb h mb IIB T3 Gb
Pump without sensor: Ex db IIB T3,T4 Gb
Pump with sensor: Ex db eb mb T3,T4 Gb
Directive/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.
= The equipment conforms to harmonised European standard.
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 or vapours.
Harmonised European
standard EN 60079-0
Ex = Marking of explosion protection.
hConstructional safety "c" and Liquid immersion "k" according to EN
ISO 80079-36:2016 and EN ISO 80079-37:2016
db = Flameproof enclosure according to EN 60079-1:20014.
eb = WIO sensor protection according to EN 60079-7:2015+A1:2017
mb = WIO sensor encapsulation according to EN 60079-
18:2015+A1:2017
IIB = Classification of gases, see EN IEC 60079-0:2018. Gas group B
includes gas group A.
T4/T3 = Maximum surface temperature is 135 °C / 200 °C according to EN
IEC 60079-0:2018.
Gb = Equipment protection level.

English (GB)
8
2.5.2 Australia and New Zealand
Explosion-proof variants for Australia and New
Zealand are approved Ex db IIB T3/T4 Gb (without
WIO sensor) or Ex db eb mb IIB T3/T4 Gb (with WIO
sensor).
3. Receiving the product
Before beginning installation procedures, carry out
these checks:
• Does the received pump correspond to the
order?
• Is the pump suitable for the supply voltage and
frequency available at the installation site?
• Are accessories and other equipment
undamaged?
3.1 Transporting the product
The pump may be transported and stored in a
vertical or horizontal position.
3.2 Handling and lifting 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 pump nameplate.
Fig. 4 Lifting bracket
Standard Code Description
IEC 60079-0 and
IEC 60079-1
Ex = Area classification according to IEC 60079-10-1
db = Flameproof enclosure according to IEC 60079-1:2014.
eb = WIO sensor protection according to IEC 60079-7:2017
mb = WIO sensor encapsulation according to IEC 60079-18:2017.
IIB = Classification of gases, see IEC 60079-0:2017. Gas group B includes
gas group A.
T4/T3 = Maximum surface temperature is 135 °C / 200 °C according to IEC
60079-0:2017.
Gb = Equipment protection level.
CAUTION
Crushing hazard
Minor or moderate personal injury
- Make sure the pump cannot roll or fall
over.
WARNING
Crushing hazard
Death or serious personal injury
- Always lift the pump by its lifting bracket
or by a forklift truck if the pump is fixed
on a pallet. Never lift the pump by the
power cable, hose or pipe.
TM06 3920 1215
Lifting bracket

English (GB)
9
4. Safety
For safety reasons, all work in tanks must be
supervised by a person outside the pump tank.
Tanks for submersible sewage and wastewater
pumps may contain sewage or wastewater with toxic
or contagious substances. All personnel involved
must wear appropriate personal protective
equipment and clothing. All work on and around the
pump must be carried out under strict compliance
with hygiene regulations.
4.1 Potentially explosive environments
Use explosion-proof pumps for applications in
potentially explosive environments. See section
2.5 Approvals.
Pump installation in tanks must be carried
out by specially trained persons.
Work in or near tanks must be carried out
according to local regulations.
Persons must not work in the installation
area when the atmosphere is potentially
explosive.
Make all maintenance and service work
when the pump is placed outside the tank.
WARNING
Crushing hazard
Death or serious personal injury
- Make sure that the lifting bracket is
tightened before lifting the pump.
Carelessness during lifting or transport
may cause injury to persons or damage
to the pump.
WARNING
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. It must be
possible to lock the main switch in
position 0. The electrical connection
must comply with local regulations.
SL1 and SLV pumps must under no
circumstances be used to pump explosive,
flammable or combustible liquids.
The classification of the installation site
must be approved by the local fire-fighting
authorities.
Special conditions for safe use of SL1 and
SLV explosion-proof pumps:
1. Make sure the moisture switch and
thermal switches are connected in the
same circuit but have separate alarm
outputs (motor stop) in case of high
humidity or high temperature in the
motor.
2. Bolts used for replacement must be
class A2-70 or better according to EN/
ISO 3506-1.
3. Contact the manufacturer for
information on the dimensions of the
flameproof joints.
4. The level of pumped liquid must be
controlled by two 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.
5. Make sure the permanently attached
cable is suitably mechanically
protected and terminated in a suitable
terminal board placed outside the
potentially explosive area.
6. The sewage pumps have an ambient
temperature range of -20 °C to +40 °C
and a maximum process temperature
of +40 °C. The minimum ambient
temperature for a pump with a water-
in-oil sensor is 0 °C.
7. The thermal protection in the stator
windings has a nominal switch
temperature of 150 °C and must
guarantee the disconnection of the
power supply. The power supply must
be reset manually.
8. The control unit must protect the WIO
sensor against short circuit current of
the supply to which it is connected. The
maximum current from the control unit
must be limited to 350 mA.
9. In case of frequency converter usage,
the maximum surface temperature of
the pump can be 200 °C.
10. The WIO sensor is intended for use
only with a galvanically isolated circuit.
11. The lock nut of the cable connector
must only be replaced with an identical
one.
12. The WIO sensor must be connected
according to these installation
instructions.
EX pumps are equipped with a WIO
sensor optionally.

English (GB)
10
5. Mechanical installation
Fix the extra nameplate supplied with the pump to
the cable end in the control cabinet.
All safety regulations must be observed at the
installation site, for example the use of blowers for
fresh-air supply to the tank.
Prior to installation, check the oil level in the oil
chamber. See section 8. Servicing the product.
5.1 Installation types
SL1 and SLV pumps are designed for two installation
types:
• submerged installation on auto coupling
• free-standing submerged installation on ring
stand.
Compliance with the standard EN 60079-
14 is a customer responsibility.
WARNING
Body injury
Death or serious personal injury
- Pump installation in tanks must be
carried out by specially trained persons.
Work in or near tanks must be carried
out according to local regulations.
Persons must not work in the installation
area when the atmosphere is potentially
explosive.
WARNING
Crushing hazard
Death or serious personal injury
- During installation, always support the
pump by lifting chains or place it in
horizontal position to secure stability.
Prior to installation, make sure the tank
bottom is even.
WARNING
Electric shock
Death or serious personal injury
- Before beginning the installation, switch
off the power supply and lock the main
switch in position 0.
- Make sure that the power supply cannot
be switched on unintentionally.
- Any external voltage connected to the
pump must be switched off before
working on the pump.
Further details concerning accessories
can be found in the data booklet on SL1
and SLV pumps on www.grundfos.com.
WARNING
Crushing of hands
Death or serious personal injury
- Do not put your hands or any tool into
the pump inlet or outlet port after the
pump is 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 switched on
unintentionally. Make sure that all the
rotating parts have stopped moving.
Always use Grundfos accessories to avoid
malfunctions due to incorrect installation.
CAUTION
Crushing hazard
Minor or moderate personal injury
- Use the lifting bracket only for lifting the
pump. Do not use it to hold the pump in
operation.

English (GB)
11
5.1.1 Submerged installation on auto coupling
Fig. 5 Submerged installation on auto coupling
Pumps for permanent installation can be installed on
a stationary auto-coupling guide-rail system. The
auto-coupling system facilitates maintenance and
service as the pump can easily be lifted out of the
tank.
Proceed as follows:
1. Drill mounting holes for the guide rail bracket on
the inside of the tank and fasten the guide rail
bracket provisionally with two screws.
2. Place the auto-coupling base unit on the bottom
of the tank. Use a plumb line to establish the
correct positioning. Fasten the auto coupling with
expansion bolts. If the bottom of the tank is
uneven, the auto-coupling base unit must be
supported so that it is level when being fastened.
3. Assemble the outlet pipe in accordance with the
generally accepted procedures and without
exposing the pipe 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 tank.
5. Unscrew the provisionally fastened guide rail
bracket. Insert the upper guide rail bracket into
the guide rails. Fasten the guide rail bracket on
the inside of the tank.
6. Clean out debris from the tank before lowering
the pump into the tank.
7. Fit the guide claw to the outlet port of the pump.
8. Slide the guide claw of the pump between the
guide rails and lower the pump into the tank by 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 tank 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 tank.
Make sure that the cables are not sharply bent or
pinched.
11. Connect the power cable.
TM04 2650 2808
Before beginning installation procedures,
make sure that the atmosphere in the tank
is not potentially explosive.
Inspect the oil level and condition every
3000 operating hours or at least once a
year.
When the pump is new or after
replacement of the shaft seal, check the oil
level and water content after one week of
operation.
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. Use loose flanges to
ease the installation and to avoid pipe
tension at flanges and bolts.
Do not use elastic elements or bellows in
the pipes. These elements must never be
used to align the pipes.
The guide rails must not have any axial
play as this would cause noise during
pump operation.
The free end of the cable must not be
submerged, as water may penetrate into
the cable.

English (GB)
12
5.1.2 Free-standing submerged installation on
ring stand
Fig. 6 Free-standing submerged installation on
ring stand
Pumps for free-standing submerged installation must
be installed on a ring stand. See fig. 6.
The ring stand is available as an accessory.
If a hose is used, make sure that the hose does not
buckle and the inside diameter of the hose matches
the pump outlet port.
If a rigid pipe is used, fit the parts in the following
order:
1. union or coupling
2. non-return valve
3. isolating valve
If the pump is supposed to be installed in muddy
conditions or on uneven ground, place it on solid
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 a chain
secured to the lifting bracket of the pump. Place
the pump on a plain, solid foundation. Make sure
that the pump is hanging from the chain and not
the cable. Make sure that the pump is standing
securely.
3. Hang up the end of the chain on a suitable hook
at the top of the tank so the chain cannot touch
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 tank.
Make sure that the cable is not sharply bent or
pinched.
5. Connect the power cable.
5.2 Torques for inlet and outlet flanges
Grade 4.6 (5) galvanised steel screws and nuts
Grade A2.50 (AISI 304) steel screws and nuts
TM04 2651 2808
The free end of the cable must not be
submerged, as water may penetrate into
the cable.
DN DC
[mm] Screws
Specified torques
rounded off by ± 5
[Nm]
Slightly
oiled
Well
lubricated
DN 65 145 4 x M16 70 60
DN 80 160 8 x M16 70 60
DN 100 180 8 x M16 70 60
DN 150 240 8 x M20 140 120
DN DC
[mm] Screws
Specified torques
rounded off by ± 5
[Nm]
Slightly
oiled
Well
lubricated
DN 65 145 4 x M16 - 60
DN 80 160 8 x M16 - 60
DN 100 180 8 x M16 - 60
DN 150 240 8 x M20 - 120
The gasket must be a full face, reinforced
paper gasket like Klingersil C4300. If softer
gasket material is used, torques must be
reconsidered.

English (GB)
13
6. Electrical connection
Protection and control functions
Level controllers
To prevent air intake, dry running and vibrations,
install the stop level switch so the pump is stopped
before the liquid level falls below the upper edge of
the pump’s clamp.
Fig. 7 Start and stop levels
Switches and sensors
Explosion-proof pumps are assembled with a
WIO sensor optionally. The sensor measures the
water content from 0 to 20 %. It also sends a signal if
the water content is outside the normal range
(warning), or if there is air in the oil chamber (alarm).
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. It must be
possible to lock the main switch in
position 0. The electrical connection
must comply with local regulations.
The pumps must be connected to a control
box with a motor protection relay with IEC
trip class 10 or 15.
Power supply for motor protection circuit
must be low voltage, Class 2.
See motor protection wiring diagram in
section 6.1 Wiring diagrams.
TM04 2654 2808
Start
Stop S1
operation
Alarm
Min. 10 cm
Stop S3
operation
The pump must not run dry. Dry running
may cause ignition hazard.
Install an independent secondary level
switch to the same level to ensure that the
pump is stopped in case the primary stop
level switch is not working.
Stop level switches must be set to Stop S1
or Stop S3 levels, depending on operation.
See fig. 7.
Pumps for hazardous locations must be
connected to a control box with a motor
protection relay with IEC trip class 10.
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 by the local fire-fighting
authorities.
On explosion-proof pumps, make sure that
an external earth conductor is connected
to the external earth terminal on the pump
using 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, for example type
H07 V2-K (PVT 90 °) yellow and green.
Make sure that the earth connection is
protected from 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 231 or LC
241 pump controller through the
intrinsically safe barrier to ensure a safe
circuit.
DANGER
Electric shock
Death or serious personal injury
- If the supply cable is damaged, it must
be replaced by the manufacturer, its
service agent or similarly qualified
persons.
Set the motor-protective circuit breaker to
the rated current of the pump. The rated
current is stated on the pump nameplate.

English (GB)
14
The mains supply voltage and frequency are marked
on the pump nameplate. The voltage tolerance must
be within -10 % to +10 % 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, except for pumps for Australia and New
Zealand which have 15 m cable.
Pumps without sensor must be connected to one of
these three controller types:
• a control box with motor-protective circuit
breaker, such as a Grundfos CU 100
• a Grundfos LC 231 or LC 241 pump controller
• a Grundfos DC, DCD pump controller.
Pumps with WIO sensor must be connected to a
Grundfos IO 113 and one of these three controller
types:
• a control box with motor-protective circuit
breaker, such as a Grundfos CU 100
• a Grundfos LC 231 or LC 241 pump controller
• a Grundfos DC, DCD pump controller.
Pumps with WIO sensor
Note that the following may cause problems in case
of transients in the power supply system:
• Motor power:
– The bigger the motor, the higher the transients.
• Length of power cable:
– Where power and signal conductors are
running in parallel close to each other, the risk
of transients causing interference between
power and signal conductors will increase with
the length of the cable.
• Switchboard layout:
– Power and signal conductors must be
physically separated as much as possible.
Close installation can cause interference in
case of transients.
• Supply network "stiffness":
– If a transformer station is located close to the
installation, the supply network may be "stiff"
and transient levels will be higher.
If combinations of the above aspects are present, it
may be necessary to install RC filters for pumps with
WIO sensors to protect against transients.
Transients can be completely eliminated if soft
starters are used. Be aware that soft starters and
variable speed drives have other Electro-Magnetic
Compatibility (EMC)-related issues that must be
taken into consideration.
For more information, see section 6.7 Frequency
converter operation.
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.
Before installation and the first startup of
the pump, check the condition of the cable
to avoid short circuits.
CAUTION
Electric shock
- For safe installation and operation of
pumps equipped with a WIO sensor, an
RC filter is recommended. If an RC filter
is installed to avoid any kind of
transients in the installation, the RC
filter must be installed between the
power connector and the pump.

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15
6.1 Wiring diagrams
The pumps are supplied with either a 7-core cable or a 10-core cable. See the wiring diagrams below.
Fig. 8 Wiring diagram, 7-core cable, DOL
WARNING
Electric shock
Death or serious personal injury
- Make sure the earth and phase
conductors are not mixed up. Make sure
the earth conductor is connected first.
Make sure that the product is earthed
properly.
TM04 6884 0314
Standard version
Thermal switch and
moisture switch*
Sensor version
Thermal switch, Pt1000 resistor,
moisture switch and water-in-oil
sensor
Sensor version
Thermal switch, PTC thermistor *,
moisture switch and water-in-oil
sensor
* 4 kW and larger pumps sold in Australia and New Zealand are fitted with a PTC thermistor.
Yellow and green

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16
Fig. 9 Wiring diagram, 10-core cable, star/delta (Y/D)
TM04 6885 0314
Standard version
Thermal switch and
moisture switch*
Sensor version
Thermal switch, Pt1000 resistor,
moisture switch and water-in-oil
sensor
Sensor version
Thermal switch, PTC thermistor *,
moisture switch and water-in-oil
sensor
* 4 kW and larger pumps sold in Australia and New Zealand are fitted with a PTC thermistor.
Yellow and green

English (GB)
17
Fig. 10 Wiring diagram, 10-core cable, star-connected (Y)
TM04 6886 0314
Yellow and green
Standard version
Thermal switch and
moisture switch*
Sensor version
Thermal switch, Pt1000 resistor,
moisture switch and water-in-oil
sensor
Sensor version
Thermal switch, PTC thermistor *,
moisture switch and water-in-oil
sensor
* 4 kW and larger pumps sold in Australia and New Zealand are fitted with a PTC thermistor.

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18
Fig. 11 Wiring diagram, 10-core cable, delta-connected (D)
To find out whether the pump is fitted with a thermal
switch or a PTC thermistor, measure the motor
winding resistance. See table below.
TM04 6887 0314
Yellow and green
Standard version
Thermal switch and
moisture switch*
Sensor version
Thermal switch, Pt1000 resistor,
moisture switch and water-in-oil
sensor
Sensor version
Thermal switch, PTC thermistor *,
moisture switch and water-in-oil
sensor
* 4 kW and larger pumps sold in Australia and New Zealand are fitted with a PTC thermistor.
Without
cable
With 10 m
cable
With 15 m
cable
Thermal
switch < 50 mΩ< 320 mΩ< 390 mΩ
PTC
thermistor > 100 mΩ> 370 mΩ> 440 mΩ

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19
6.2 Pump controllers
SL1 and SLV pumps can be connected to the
following Grundfos pump controllers for level control:
• LC 231 or LC 241
• Grundfos DC and DCD.
For further information on controllers, see the
installation and operating instructions for the
selected controller or go to www.grundfos.com.
6.3 Thermal switch, Pt1000 and PTC
thermistor
All SL1 and SLV pumps have thermal protection
incorporated in the stator windings.
Pumps without sensor
Pumps without sensor have a thermal switch or a
PTC thermistor. Through the pump controller safety
circuit, the thermal switch will stop the pump by
breaking the circuit in case of overtemperature
(approximately 150 °C). The thermal switch will close
the circuit after cooling. For pumps equipped with a
PTC thermistor, connect the thermistor to either the
PTC relay or the I/O module to break the circuit at
150 °C.
The maximum operating current of the thermal
switch is 0.5 A at 500 VAC and cos φ 0.6. The switch
must be able to break a coil in the supply circuit.
Pumps with WIO sensor
Pumps with WIO sensor have either a thermal switch
and a Pt1000 sensor or a PTC thermistor in the
windings, depending on the installation site.
Through the pump controller safety circuit, the
thermal switch or the thermistor will stop the pump
by breaking the circuit in case of overtemperature
(approximately 150 °C). The thermal switch or the
thermistor will close the circuit after cooling.
The maximum operating current of both the Pt1000
and the thermistor is 1 mA at 24 VDC.
Non-explosion-proof pumps
When closing the circuit after cooling, the thermal
protection can restart the pump automatically
through the controller. Pumps from 4 kW and up sold
in Australia and New Zealand are fitted with a PTC
thermistor.
Explosion-proof pumps
6.4 WIO sensor (water-in-oil sensor)
The WIO sensor measures the water content in the
oil and converts the value into an analogue current
signal. The two sensor conductors are for power
supply and for carrying the signal to the IO 113. The
sensor measures the water content from 0 to 20 %. It
also sends a signal if the water content is outside the
normal range (warning), or if there is air in the oil
chamber (alarm). The sensor is fitted in a stainless-
steel tube for mechanical protection.
Fig. 12 WIO sensor
6.4.1 Fitting the WIO sensor
Fit the sensor next to one of the shaft seal openings.
See Fig. 12. The sensor must be tilted into the
motor's direction of rotation to ensure that oil is led
into the sensor. Make sure that the sensor is
submerged in the oil.
6.4.2 Technical data
See also the installation and operating instructions
for IO 113 on www.grundfos.com.
The thermal protection of explosion-proof
pumps must not restart the pump
automatically. This ensures protection
against overtemperature in potentially
explosive environments. In pumps with
sensor this is done by removing the short
circuit between terminals R1 and R2 in the
IO 113. See Electrical data in the
installation and operating instructions for
IO 113 (net.grundfos.com/qr/i/98097396).
The separate motor-protective circuit
breaker or controller must not be installed
in potentially explosive environments.
TM04 5238 2909 - TM03 1164 1105
Input voltage: 12-24 VDC
Output current: 3.4 - 22 mA
Power input: 0.6 W
Ambient temperature: 0-70 °C

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6.5 Moisture switch
All pumps are fitted with a moisture switch as
standard with the moisture switch being connected
through the supply cable, see section 6. Electrical
connection, and connected to a separate circuit
breaker.
The moisture switch is positioned in the bottom of
the motor. If there is moisture in the motor, the switch
will break the circuit and send a signal to the IO 113.
The moisture switch is non-reversing and must be
replaced after use.
The moisture switch is connected to the control
cable, and it must be connected to the safety circuit
of the separate pump controller. See section
6. Electrical connection.
6.6 IO 113
IO 113 provides an interface between a Grundfos
wastewater pump equipped with sensors and the
pump controller(s). The most important sensor status
information is indicated on the front panel.
One pump can be connected to one IO 113 module.
Together with the sensors, the IO 113 provides a
galvanic isolation between the motor voltage in the
pump and the connected controller(s).
IO 113 can do the following as standard:
• Protect the pump against overheating.
• Monitor the status of these items:
– motor winding temperature
– leakage (WIO)
– moisture in pump.
• Measure the stator insulation resistance.
• Stop the pump in case of alarm.
• Remotely monitor the pump through RS-485
communication (Modbus or GENIbus).
• Control the pump by frequency converter.
Fig. 13 IO 113 module
CAUTION
Electric shock
Minor or moderate personal injury
- The motor-protective circuit breaker of
the pump controller must include a
circuit which automatically disconnects
the power supply in case the protective
circuit for the pump is opened.
TM05 1881 3811
Pos. Description
1 Terminals for alarm relay
2Terminals for analog and digital inputs and
outputs
3 Terminals for supply voltage
4Potentiometer for setting the warning limit
of stator insulation resistance
5Terminals for RS-485 for GENIbus or
Modbus
6 Indicator light for moisture measurement
7Indicator light for stator insulation
resistance
8 Indicator light for leakage (WIO)
9 Indicator light for vibration in pump
10 Terminals for measurement of stator
insulation resistance
11 Terminals for connection of pump sensors
12 DIP switch for configuration
13 Indicator light for motor temperature
14 Button for resetting alarms
15 Indicator light for motor running
16 Indicator light for service
17 Terminals for digital outputs
PET1 T2 G1 A1 G2 A2 K1 K2 R1 R2
D1 D2 D3 D4 D5 D6 D7 D8
P1 P2 P3 P4 P5
AYB
I1 I2 I3
ON DIP
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