Grundfos SQ Series User manual

SQ, SQE
Installation and operating instructions
SQ, SQE
Installation and operating instructions
Other languages
http://net.grundfos.com/qr/i/96160909
GRUNDFOS INSTRUCTIONS

SQ, SQE
English (GB)
Installation and operating instructions ..................................5
Български (BG)
Упътване за монтаж и експлоатация.................................24
Čeština (CZ)
Montážní a provozní návod ........................................43
Deutsch (DE)
Montage- und Betriebsanleitung .....................................62
Dansk (DK)
Monterings- og driftsinstruktion ......................................81
Eesti (EE)
Paigaldus- ja kasutusjuhend.......................................100
Español (ES)
Instrucciones de instalación y funcionamiento...........................119
Suomi (FI)
Asennus- ja käyttöohjeet .........................................138
Français (FR)
Notice d'installation et de fonctionnement..............................157
Ελληνικά (GR)
Οδηγίες εγκατάστασης και λειτουργίας................................176
Hrvatski (HR)
Montažne i pogonske upute .......................................195
Magyar (HU)
Telepítési és üzemeltetési utasítás ..................................214
Italiano (IT)
Istruzioni di installazione e funzionamento .............................233
Lietuviškai (LT)
Įrengimo ir naudojimo instrukcija ....................................252
Latviešu (LV)
Uzstādīšanas un ekspluatācijas instrukcija .............................271
Nederlands (NL)
Installatie- en bedieningsinstructies ..................................290
Polski (PL)
Instrukcja montażu i eksploatacji....................................309
3
Table of contents

Português (PT)
Instruções de instalação e funcionamento .............................328
Română (RO)
Instrucţiuni de instalare şi utilizare...................................347
Русский (RU)
Паспорт, Руководство по монтажу и эксплуатации......................366
Svenska (SE)
Monterings- och driftsinstruktion ....................................385
Slovensko (SI)
Navodila za montažo in obratovanje .................................404
Slovenčina (SK)
Návod na montáž a prevádzku .....................................423
Türkçe (TR)
Montaj ve kullanım kılavuzu .......................................442
Українська (UA)
Інструкції з монтажу та експлуатації ................................461
Bahasa Indonesia (ID)
Petunjuk pengoperasian dan pemasangan.............................480
Қазақша (KZ)
Орнату жəне пайдалану нұсқаулықтары .............................499
(AR) ةيبرعلا
    .............................................518
Appendix A..................................................537
4SQ, SQE
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 6
2. Symbols used in this document ...... 6
3. General .................... 7
3.1 Applications .................. 7
4. Technical data ................ 8
4.1 Storage .................... 8
4.2 Sound pressure level ............. 8
5. Preparation.................. 9
5.1 Refilling of motor liquid ............ 9
5.2 Positional requirements............ 9
5.3 Liquid temperatures/cooling .........10
6. Electrical connection ............11
6.1 General ....................11
6.2 Motor protection................12
6.3 Connection of motor .............12
7. Installation ..................12
7.1 General ....................12
7.2 Assembly of pump part and motor ......13
7.3 Removal of non-return valve .........13
7.4 Fitting the cable plug to the motor ......14
7.5 Fitting the cable guard ............14
7.6 Cable sizing ..................15
7.7 Fitting the submersible drop cable ......15
7.8 Pipework connection .............16
8. Start-up ....................17
9. Operation...................17
9.1 Minimum flow rate ..............17
9.2 Selection of diaphragm tank and setting
of precharge pressure and pressure
switch .....................17
9.3 Well system pressure overload........18
9.4 Built-in protection ...............19
10. Maintenance and service ..........19
10.1 Contaminated pumps .............19
11. Fault finding chart ..............20
11.1 The pump does not run. ...........20
11.2 The pump runs but gives no water.......20
11.3 The pump runs at reduced capacity. .....20
11.4 Frequent starts and stops. ..........21
11.5 Megging ....................21
12. Checking the power supply ........22
13. Environment .................23
14. Disposing of the product ..........23
5
English (GB)

1. General information
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 super-
vision 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.
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
2. Symbols used in this document
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 seri-
ous personal injury.
CAUTION
Indicates a hazardous situation which, if
not avoided, could result in minor or mod-
erate personal injury.
The text accompanying the three hazard symbols
DANGER, WARNING and CAUTION is structured in
the following way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
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, in-
dicates 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.
6
English (GB)

3. General
WARNING
Electric shock
Death or serious personal injury
‐The pump must not be used when peo-
ple are in the water.
In the section A.1. Appendix of these installation and
operating instructions, you will find copies of the
pump and motor nameplates.
Before the SQ/SQE pump is lowered into the
borehole, this page should be filled in with the
relevant nameplate data.
These installation and operating instructions must be
kept in a dry place near the installation site for
reference purposes.
3.1 Applications
The SQ and SQE pumps are designed for pumping
thin, clean, non-aggressive, non-explosive liquids, not
containing solid particles or fibres.
Typical applications:
• Groundwater supply for
- private housing
- small waterworks
- irrigation systems in for instance green
houses.
• Liquid transfer in tanks.
• Pressure boosting.
The SQE-NE pumps are designed for pumping thin,
clean, non-explosive liquids, not containing solid
particles or fibres.
These pumps are suitable for pumping contaminated
or hydrogen-carbonate containing groundwater, e.g.
from
• dumps
• chemical depots
• industrial areas
• oil and petrol filling stations
• environmental applications.
The SQE-NE pumps can also be used for sampling
and monitoring and to some extent for incorporation
in water treatment systems.
Information applying to all pump types
The maximum sand content of the water must not
exceed 50 g/m3. A larger sand content will reduce the
life of the pump and increase the risk of blocking.
If liquids with a viscosity higher than that of
water are to be pumped, please contact
Grundfos.
pH values
SQ and SQE: 5 to 9.
SQE-NE: Please contact Grundfos.
Liquid temperature
The temperature of the pumped liquid must not
exceed 35 °C.
7
English (GB)

4. Technical data
Supply voltage
1 x 200-240 V - 10 %/+ 6 %, 50/60 Hz, PE.
Operation via generator: As a minimum, the
generator output must be equal to the motor P1 [kW]
+ 10 %.
Starting current
The motor starting current is equal to the highest
value stated on the motor nameplate.
Power factor
PF = 1.
Motor liquid
Type SML 3.
Motor cable
1.5 m, 3 x 1.5 mm2, PE.
Liquid temperature
Maximum 35 °C.
Pump outlet size
SQ 1, SQ 2, SQ 3: Rp 1 1/4.
SQ 5, SQ 7: Rp 1 1/2.
Pump diameter
74 mm.
Borehole diameter
Minimum 76 mm.
Installation depth
Maximum 150 m below static water level.
See also section Installation depths.
Net weight
Maximum 6.5 kg.
Related information
7.8.2 Installation depths
4.1 Storage
Storage temperature: -20 °C to +60 °C.
4.1.1 Frost protection
If the pump has to be stored after use, it must be
stored on a frost-free location or it must be ensured
that the motor liquid is frost-proof.
The motor must not be stored without being filled with
motor liquid.
4.2 Sound pressure level
The sound pressure level of the pump is lower than
the limiting values stated in the EC Council Directive
2006/42/EC relating to machinery.
8
English (GB)

5. Preparation
Grundfos MS 3 and MSE 3 submersible motors have
water-lubricated slide bearings. No additional
lubrication is required.
The submersible motors are factory-filled with a
special Grundfos motor liquid (type SML 3), which is
frost-proof down to -20 °C and preserved to prevent
the growth of bacteria.
The level of motor liquid is decisive for the operating
life of the bearings and consequently the life of the
motor.
5.1 Refilling of motor liquid
If for any reason the motor liquid has been drained or
lost, the motor must be refilled with Grundfos motor
liquid SML 3.
To refill the motor, proceed as follows:
1. Remove the cable guard and separate the pump
part from the motor.
10°
TM029606
Refilling of motor liquid
2. Place the motor in vertical position with an
inclination of approx. 10 °.
3. Remove the filling plug using a screwdriver or a
similar tool.
4. Inject motor liquid into the motor with a filling
syringe or the like.
5. To allow possible air to escape, move the motor
from side to side.
6. Refit the filling plug and make sure it is tight.
7. Assemble pump part and motor.
8. Refit the cable guard.
The pump is now ready for installation.
5.2 Positional requirements
The pump is suitable for vertical as well as horizontal
installation, however, the pump shaft must never fall
below the horizontal plane. See fig. Positional
requirements of the pump.
1
2
TM011375
Positional requirements of the pump
Pos. Description
1 Allowed
2 Not allowed
If the pump is to be installed horizontally, e.g. in a
tank, and there is a risk that the pump might be
covered by mud, it must be fitted in a flow sleeve.
For installation depths, see section Installation
depths.
Related information
7.8.2 Installation depths
9
English (GB)

5.3 Liquid temperatures/cooling
Figure SQ/SQE pump in a borehole shows an
SQ/SQE pump installed in a borehole. The pump is
operating.
Figure SQ/SQE pump in a borehole illustrates the
following:
• borehole diameter
• pump diameter
• temperature of pumped liquid
• flow past the motor to the pump suction strainer.
1
2
3
TM010518
SQ/SQE pump in a borehole
Pos. Description
1 Liquid temperature
2 Borehole diameter
3 Pump diameter
To ensure sufficient cooling of the motor, it is
important to observe the maximum liquid temperature
of 35 °C under all conditions.
The borehole diameter must be at least 76
mm (approx. 3").
The motor should always be installed above the well
screen. If a flow sleeve is used, the pump may be
installed freely in the borehole.
Do not let the pump run against a closed
discharge pipe for more than 5 minutes.
When the discharge pipe is closed, there
is no cooling flow and there is a risk of
overtemperature in motor and pump.
If the actual temperature of the pumped liquid
exceeds the specified value or the operating
conditions otherwise fall outside the specified
conditions, the pump may stop. Please contact
Grundfos.
10
English (GB)

6. Electrical connection
6.1 General
The electrical connection should be carried out by an
authorised electrician in accordance with local
regulations.
WARNING
Electric shock
Death or serious personal injury
‐Before starting work on the pump,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
‐The pump must be earthed.
‐The pump must be connected to an ex-
ternal mains switch with a minimum
contact gap of 3 mm in all poles.
‐If the motor cable is damaged, it must
be replaced by Grundfos, an author-
ised Grundfos service workshop or
similarly qualified persons to avoid a
hazard.
The supply voltage, rated maximum current and
power factor (PF) appear from the motor nameplate.
The required voltage for Grundfos submersible
motors, measured at the motor terminals, is - 10 %/+
6 % of the nominal voltage during continuous
operation (including variation in the supply voltage
and losses in cables).
WARNING
Electric shock
Death or serious personal injury
‐If the pump is connected to an electric
installation where an earth-leakage cir-
cuit breaker (ELCB) is used as an ad-
ditional protection, this circuit breaker
must trip out when earth fault currents
with DC content (pulsating DC) occur.
The earth leakage circuit breaker must be marked
with the following symbol: .
Supply voltage
1 x 200-240 V - 10 %/+ 6 %, 50/60 Hz, PE.
The current consumption can only be measured by
means of a true RMS instrument. If other instruments
are used, the value measured will differ from the
actual value.
On SQ/SQE pumps, a leakage current of 2.5 mA at
230 V, 50 Hz, can typically be measured. The leakage
current is proportional to the supply voltage.
The SQE and SQE-NE pumps can be connected to a
control box, type CU 300 or CU 301.
The pump must never be connected to a
capacitor or to another type of control box
than CU 300 or CU 301.
The pump must never be connected to an
external frequency converter.
11
English (GB)

6.2 Motor protection
The motor incorporates thermal overload protection
and requires no additional motor protection.
6.3 Connection of motor
The motor incorporates a starter device and can
therefore be connected directly to the mains.
Start/stop of the pump will typically be done via a
pressure switch. See fig. Connection of motor.
The pressure switch must be rated for the
maximum amps of the specific pump size.
N L
P1
TM011480
Connection of motor
Pos. Description
1 Pressure switch
7. Installation
7.1 General
WARNING
Electric shock
Death or serious personal injury
‐Before starting any work on the prod-
uct, make sure that the power supply
has been switched off and that it can-
not be accidentally switched on.
WARNING
Contamination when pumping drinking
water
Death or serious personal injury
‐Before the pump is used for supplying
drinking water, flush the pump thor-
oughly with clean water.
‐Do not use the pump for drinking water
if the internal parts have been in con-
tact with particles or substances not
suitable for water intended for human
consumption.
The pump must be installed according to
national water regulations and standards.
Do not lower or lift the pump by means of
the motor cable.
The separate data plate supplied with the pump
should be fixed close to the installation site.
12
English (GB)

7.2 Assembly of pump part and motor
To assemble pump part and motor, proceed as
follows:
1. Place the motor horizontally in a vice and tighten
it. See fig. Assembly of pump part and motor.
2. Pull the pump shaft out to the position shown in
fig. Position of pump shaft.
TM028425
Position of pump shaft
3. Grease the motor shaft end with the grease
supplied with the motor.
4. Screw the pump part on the motor (55 Nm).
Caution: The pump shaft must engage with the
motor shaft. A spanner may be used on the
clamping faces of the pump part. See fig.
Assembly of pump part and motor.
L
156 mm
TM012854
Assembly of pump part and motor
Motor (P2)
[kW]
L
[mm]
0.70 120
1.15 102
1.55 84
1.85 66
When pump part and motor have been assembled
correctly, there must not be a clearance between
pump part and motor.
7.3 Removal of non-return valve
If a pump without non-return valve is required, the
valve can be removed as follows:
1. Cut off the legs of the valve guide using side-
cutting pliers or a similar tool. See fig. Removal of
non-return valve.
2. Turn the pump upside down.
3. Check that all loose parts fall out of the pump.
TM014337
TM014338
Removal of non-return valve
SQE-NE is supplied without non-return
valve.
The non-return valve can be fitted in a Grundfos
service workshop.
13
English (GB)

7.4 Fitting the cable plug to the motor
WARNING
Electric shock
Death or serious personal injury
‐The motor plug must under no circum-
stances be removed by the user.
‐The cable with plug must be fitted or
removed by an authorised Grundfos
service workshop or a similarly quali-
fied person.
The following description is exclusively intended for
service personnel. If the motor cable is to be
replaced, see section General.
The cable plug supplied with the motor is factory-
greased. Check that the plug is greased correctly.
To fit the cable plug, proceed as follows:
1. Check that the cable is of the correct type, cross-
section and length.
2. Check that the mains on the location has correct
connection to earth.
3. Check that the motor socket is clean and dry.
Make sure that the loose gasket has been fitted.
4. Press the cable plug onto the motor socket. The
plug cannot be fitted wrongly. See fig. Fitting the
cable plug onto the motor socket.
TM029605
Fitting the cable plug onto the motor socket
5. Fit and tighten the four screws (1 - 1.5 Nm). See
fig. Fitting the cable plug onto the motor socket.
When the plug has been fitted, there must not be a
clearance between the motor and the cable plug.
Related information
6.1 General
7.5 Fitting the cable guard
To fit the cable guard, proceed as follows:
1. Make sure that the submersible drop cable lies flat
in the cable guard.
2. Place the cable guard in the groove in the cable
plug. The two flaps of the cable guard must
engage with the upper edge of the pump sleeve.
See fig. Placement of the cable guard in the cable
plug.
TM029613
Placement of the cable guard in the cable plug
3. Fasten the cable guard to the pump suction
strainer with the two self-tapping screws supplied.
See fig. Fastening of the cable guard to the pump
suction strainer.
TM014427
Fastening of the cable guard to the pump suction
strainer
14
English (GB)

7.6 Cable sizing
Before you install the pump, make sure to use the
right cable size for the submersible drop cable.
The cross-section of the submersible drop
cable must be large enough to meet the
voltage requirements.
How to calculate the maximum cable length
If the power factor (PF) of the motor unit equals 1.0,
you can use this equation to calculate the maximum
cable length:
= 
  
1002
TM070522
Explanation of the equation
Symbol Unit Description
L MAX [m] Maximum cable length
U [V] Supply voltage
ΔU [%] Maximum recommended volt-
age drop in percentage
I [A] Maximum motor current
ρ[Ω
mm2/m] Specific resistance of the cable
ϥ[mm2]
Cross-sectional area of the indi-
vidual wires in the submersible
drop cable
Maximum motor current
The maximum motor current depends on the motor
properties and electrical installation. According to IEC
60364-5-52:2009 the installation and cable must
be dimensioned for a current that is higher than the
maximum motor current.
Maximum recommended voltage drop
• According to IEC 60364-5-52:2009 for installation
in domestic applications, the maximum
recommended voltage drop is 5 % for cable
lengths up to 100 m.
• For installation in industrial applications and in
regions where the IEC standard is not applicable,
local regulations may require that a different
maximum value for voltage drop must be used for
the calculation of the maximum cable length.
Specific resistance of the drop cables
The specific resistance of the drop cables supplied by
Grundfos for SQ and SQE pumps is 0.02 Ω mm2/m.
Maximum cable lengths for Grundfos MSF 3
motors
Calculation of maximum cable length for the different
motor sizes is based on a voltage drop of 5 % and a
supply voltage of 240 V.
If the calculation above cannot be used, go to
Grundfos Product Center for sizing.
7.7 Fitting the submersible drop cable
It is recommended to join the submersible drop cable
and the motor cable by means of a Grundfos cable
termination kit, type KM.
Cable termination kit, type KM
Cross-sectional area Product number
1.5 to 6.0 mm296021473
For larger cross-sections, please contact Grundfos.
15
English (GB)

7.8 Pipework connection
If a tool, e.g. a chain pipe wrench, is used when the
riser pipe is fitted to the pump, the pump must only be
gripped by the pump discharge chamber.
When connecting plastic pipes, a compression
coupling should be used between the pump and the
first pipe section.
For pumps fitted with plastic pipes, the ex-
pansion of the pipes when loaded should
be taken into consideration, when deciding
on the installation depth of the pump.
Where flanged pipes are used, the flanges should
be slotted to take the submersible drop cable.
Figure Pipework connection shows a pump
installation with indication of:
• position of cable clips, pos. 1, and distance
between the clips.
• fitting of straining wire, pos. 2.
• maximum installation depth below the static water
level.
1
2
3m
Max.
150 m
TM010480
Pipework connection
7.8.1 Cable clips
Cable clips must be fitted every 3 metres. See fig.
Pipework connection.
When connecting plastic pipes, some slackness
must be left between each cable clip as plastic pipes
expand when loaded.
Where flanged pipes are used, the cable clips
should be fitted above and below each joint.
7.8.2 Installation depths
Maximum installation depth below the static water
level: 150 metres. See fig. Pipework connection.
Minimum installation depths below the dynamic
water level:
•Vertical installation:During start-up and
operation, the pump must always be completely
submerged in water.
•Horizontal installation: The pump must be
installed and run at least 0.5 metres below the
dynamic water level. If there is a risk that the
pump might be covered by mud, the pump must
always be fitted in a flow sleeve.
7.8.3 When lowering the pump into the borehole
It is recommended to secure the pump by an
unloaded straining wire. See fig. Pipework
connection, pos. 2.
Slacken the straining wire so that it becomes
unloaded and lock it to the borehole seal by means of
wire locks.
The straining wire must not be used for
pulling the pump with riser pipe out of the
borehole.
Do not lower or lift the pump by means of
the motor cable.
16
English (GB)

8. Start-up
Make sure that the well is capable of yielding a
minimum quantity of water corresponding to the pump
capacity.
Do not start the pump until it is completely submerged
in the liquid.
Start the pump and do not stop it until the pumped
liquid is completely clean, as otherwise the pump
parts and the non-return valve may choke up.
9. Operation
9.1 Minimum flow rate
To ensure the necessary cooling of the motor, the
pump flow rate should never be set to a value lower
than 50 l/h.
If the flow rate suddenly falls, the reason might be
that the pump is pumping more water than the
borehole can yield. The pump must be stopped and
the fault corrected.
The pump dry-running protection is effec-
tive only within the recommended duty
range of the pump.
9.2 Selection of diaphragm tank and setting
of precharge pressure and pressure
switch
WARNING
Pressurised system
Death or serious personal injury
‐The installation must be designed for
the maximum pump pressure.
As the pump has a built-in soft starter giving a run-up
time of 2 seconds, the pressure at the pressure
switch and diaphragm tank during starting will be
lower than the pump cut-in pressure set on the
pressure switch (Pcut-in). This lower pressure is
called minimum pressure (Pmin).
Pmin is equal to the desired minimum pressure at the
highest tap + head and head loss in the pipe from the
pressure switch and diaphragm tank to the highest
tap (Pmin = B + C). See fig. Diaphragm tank and
pressure switch.
A
B
C
1
2
3
4
5
7
6
Q
TM006445
Diaphragm tank and pressure switch
Pos. Description
1 Ppre
2 Pmin
3 Pcut-in
4 Pcut-out
5 Qmax
6 Diaphragm tank
7 Pressure switch
A: Head + head loss from dynamic water level to
diaphragm tank.
B: Head + head loss from diaphragm tank to highest
tap.
C: Minimum pressure at highest tap.
Make sure that the selected pump can de-
liver a pressure higher than Pcut-out + A.
Ppre: Precharge pressure of diaphragm tank.
Pmin: Desired minimum pressure.
Pcut-in: Cut-in pressure set on pressure switch.
Pcut-out: Cut-out pressure set on pressure switch.
Qmax: Maximum flow at Pmin.
17
English (GB)

9.3 Well system pressure overload
In order to provide protection against overpressure, install a pressure relief valve downstream of the well head.
The setpoint of the pressure relief valve must be at least 30 psi above the pressure setting.
If you install a relief valve, we recommend that you connect it to an appropriate drainage point.
Using Pmin and Qmax, the minimum diaphragm tank size, precharge pressure and pressure switch settings
can be found in the guideline table below:
Example
Pmin = 35 m head, Qmax = 2.5 m3/h.
On the basis of this information, the following values can be found in the table:
Minimum diaphragm tank size = 33 litres.
Ppre = 31.5 m head
Pcut-in = 36 m head
Pcut-out = 50 m head
Pmin
[m]
Qmax [m3/h] Ppre
[m]
Pcut-in
[m]
Pcut-out
[m]
0.6 0.8 1 1.2 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8
Diaphragm tank size [litres]
25 8 8 18 18 18 18 24 33 33 50 50 50 50 80 80 80 80 80 22.5 26 40
30 8 8 18 18 18 24 33 33 50 50 50 50 80 80 80 80 80 27 31 45
35 8 18 18 18 18 24 33 33 50 50 50 80 80 80 80 80 31.5 36 50
40 8 18 18 18 18 24 33 50 50 50 80 80 80 80 80 36 41 55
45 8 18 18 18 24 33 33 50 50 50 80 80 80 80 40.5 46 60
50 8 18 18 18 24 33 50 50 50 80 80 80 80 45 51 65
55 18 18 18 18 24 33 50 50 50 80 80 80 49.5 56 70
60 18 18 18 18 24 33 50 50 80 80 80 80 54 61 75
65 18 18 18 24 24 33 50 50 80 80 80 80 58.5 66 80
1 m head = 0.098 bar.
18
English (GB)

9.4 Built-in protection
The motor incorporates an electronic unit which
protects the motor in various situations.
In case of overload, the built-in overload protection
will stop the pump for 5 minutes. After that period, the
pump will attempt to restart.
If the pump has been stopped as a result of dry
running, it will start automatically after 5 minutes.
If the pump is restarted and the borehole is empty, the
pump will stop after 30 seconds.
Resetting of the pump: Switch off the power supply
for 1 minute.
The motor is protected in case of:
• dry running
• voltage surges (up to 6000 V) In areas with high
lightning intensity, external lightning protection is
required.
• overvoltage
• undervoltage
• overload
• overtemperature.
SQE pumps/MSE 3 motors
Via the CU 300 or CU 301, the dry-running
stop limit of the MSE 3 motors can be ad-
justed to match the actual application.
10. Maintenance and service
The pumps are normally maintenance-free.
Deposits and wear may occur. For that purpose,
service kits and service tools are available from
Grundfos. The Grundfos Service Manual is available
on request.
The pumps can be serviced at a Grundfos service
centre.
10.1 Contaminated pumps
If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified as contaminated.
If Grundfos is requested to service the pump,
Grundfos must be contacted with details about the
pumped liquid, etc. before the pump is returned for
service. Otherwise, Grundfos can refuse to accept the
pump for service.
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.
SQE-NE: Only pumps that can be certified as
uncontaminated, i.e. pumps containing no hazardous
and/or toxic material, may be returned to Grundfos for
servicing.
To prevent injury to the health of persons involved
and to the environment, a document certifying that
the pump is clean is required.
Grundfos must receive this certificate before the
product. Otherwise, Grundfos will refuse to accept the
product for servicing.
Possible costs of returning the pump are paid by the
customer.
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English (GB)

11. Fault finding chart
CAUTION
Electric shock
Minor or moderate personal injury
‐Before starting any work on the pump/motor, make sure that the power supply has been switched
off and that it cannot be accidentally switched on.
11.1 The pump does not run.
Cause Remedy
The fuses in the electric installation are blown. Replace the blown fuses. If the new ones blow too, the
electric installation and the submersible drop cable
should be checked.
The ELCB or the voltage-operated ELCB has tripped
out.
Cut in the circuit breaker.
No power supply. Contact the power supply authorities.
The motor protection has cut off the power supply
due to overload.
Check whether the motor/pump is blocked.
The pump/submersible drop cable is defective. Repair/replace the pump/cable.
Overvoltage or undervoltage has occurred. Check the power supply.
11.2 The pump runs but gives no water.
Cause Remedy
The discharge valve is closed. Open the valve.
No water or too low water level in borehole. See item 3 a).
The non-return valve is stuck in its closed position. Pull out the pump and clean or replace the valve.
The suction strainer is choked up. Pull out the pump and clean the strainer.
The pump is defective. Repair/replace the pump.
11.3 The pump runs at reduced capacity.
Cause Remedy
The drawdown is larger than anticipated. Increase the installation depth of the pump, throttle the
pump or replace it by a smaller model to obtain a
smaller capacity.
The valves in the discharge pipe are partly closed/
blocked.
Check and clean/replace the valves, if necessary.
The discharge pipe is partly choked by impurities
(ochre).
Clean/replace the discharge pipe.
The non-return valve of the pump is partly blocked. Pull out the pump and check/replace the valve.
The pump and the riser pipe are partly choked by
impurities (ochre).
Pull out the pump. Check and clean or replace the
pump, if necessary. Clean the pipes.
The pump is defective. Repair/replace the pump.
Leakage in the pipework. Check and repair the pipework.
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English (GB)