Grundfos SQ User manual

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

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3
Table of contents
SQ, SQE
English (GB)
Installation and operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
 (BG)
   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
eština (CZ)
Montážní a provozní návod. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Deutsch (DE)
Montage- und Betriebsanleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Dansk (DK)
Monterings- og driftsinstruktion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Eesti (EE)
Paigaldus- ja kasutusjuhend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Español (ES)
Instrucciones de instalación y funcionamiento . . . . . . . . . . . . . . . . . . . . . . . . . 95
Suomi (FI)
Asennus- ja käyttöohjeet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Français (FR)
Notice d'installation et de fonctionnement. . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
 (GR)
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Hrvatski (HR)
Montažne i pogonske upute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Magyar (HU)
Telepítési és üzemeltetési utasítás. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Italiano (IT)
Istruzioni di installazione e funzionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Lietuviškai (LT)
rengimo ir naudojimo instrukcija . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Latviešu (LV)
Uzstdšanas un ekspluatcijas instrukcija. . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Nederlands (NL)
Installatie- en bedieningsinstructies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Polski (PL)
Instrukcja montau i eksploatacji . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Português (PT)
Instruções de instalação e funcionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Table of contents
4
SQ, SQE
Român(RO)
Instruciuni de instalare i utilizare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
 (RU)
,     . . . . . . . . . . . . . . . . . . 290
Svenska (SE)
Monterings- och driftsinstruktion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
Slovensko (SI)
Navodila za montažo in obratovanje. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Slovenina (SK)
Návod na montáž a prevádzku . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
Türkçe (TR)
Montaj ve kullanım kılavuzu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Bahasa Indonesia (ID)
Petunjuk pengoperasian dan pemasangan . . . . . . . . . . . . . . . . . . . . . . . . . . 367
 (KZ)
   . . . . . . . . . . . . . . . . . . . . . . . . . . . 382
(AR)
   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412

English (GB)
5
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 5
2. General 6
2.1 Applications 6
3. Technical data 7
3.1 Storage 7
3.2 Sound pressure level 7
4. Preparation 7
4.1 Refilling of motor liquid 7
4.2 Positional requirements 8
4.3 Liquid temperatures/cooling 8
5. Electrical connection 9
5.1 General 9
5.2 Motor protection 9
5.3 Connection of motor 9
6. Installation 10
6.1 General 10
6.2 Assembly of pump part and motor 10
6.3 Removal of non-return valve 10
6.4 Fitting the cable plug to the motor 11
6.5 Fitting the cable guard 11
6.6 Cable sizing 12
6.7 Fitting the submersible drop cable 13
6.8 Pipework connection 13
7. Start-up 14
8. Operation 14
8.1 Minimum flow rate 14
8.2 Selection of diaphragm tank and setting
of precharge pressure and pressure
switch 14
8.3 Well system pressure overload 15
8.4 Built-in protection 16
9. Maintenance and service 16
9.1 Contaminated pumps 16
10. Fault finding chart 17
10.1 Megging 18
11. Checking the power supply 19
12. Environment 19
13. Disposal 19
Prior to installation, read this document.
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.

English (GB)
6
The text accompanying the three hazard symbols
DANGER, WARNING and CAUTION is structured in
the following way:
2. General
On page 412 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.
2.1 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.
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.
SIGNAL WORD
Description of 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,
indicates that an action must not be taken
or must be stopped.
If these instructions are not observed, it
may result in malfunction or damage to the
equipment.
Tips and advice that make the work easier.
WARNING
Electric shock
Death or serious personal injury
- The pump must not be used when
people are in the water. If liquids with a viscosity higher than that of
water are to be pumped, please contact
Grundfos.

English (GB)
7
3. 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 6.8.2 Installation depths.
Net weight
Maximum 6.5 kg.
3.1 Storage
Storage temperature: -20 °C to +60 °C.
3.1.1 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.
3.2 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.
4. 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.
4.1 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.
Fig. 1
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.
TM02 9606 3504
10

English (GB)
8
4.2 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. 2.
Fig. 2
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 6.8.2 Installation
depths.
4.3 Liquid temperatures/cooling
Figure 3shows an SQ/SQE pump installed in a
borehole. The pump is operating.
Figure 3illustrates the following:
• borehole diameter
• pump diameter
• temperature of pumped liquid
• flow past the motor to the pump suction strainer.
Fig. 3
To ensure sufficient cooling of the motor, it is
important to observe the maximum liquid
temperature of 35 °C under all conditions.
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.
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.
TM01 1375 4397
Allowed
Not allowed
TM01 0518 1297
The borehole diameter must be at least
76 mm (approx. 3").
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.
Liquid
temperature
Borehole
diameter
Pump
diameter

English (GB)
9
5. Electrical connection
5.1 General
The electrical connection should be carried out by an
authorised electrician in accordance with local
regulations.
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).
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.
5.2 Motor protection
The motor incorporates thermal overload protection
and requires no additional motor protection.
5.3 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. 4.
Fig. 4
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
external 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 authorised
Grundfos service workshop or similarly
qualified persons to avoid a hazard.
WARNING
Electric shock
Death or serious personal injury
- If the pump is connected to an electric
installation where an earth-leakage
circuit breaker (ELCB) is used as an
additional protection, this circuit breaker
must trip out when earth fault currents
with DC content (pulsating DC) occur.
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.
The pressure switch must be rated for the
maximum amps of the specific pump size.
TM01 1480 4697
NL
P
Pressure switch

English (GB)
10
6. Installation
6.1 General
The loose data plate supplied with the pump should
be fixed close to the installation site.
6.2 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. 6.
2. Pull the pump shaft out to the position shown in
fig. 5.
Fig. 5
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. 6.
Fig. 6
When pump part and motor have been assembled
correctly, there must not be a clearance between
pump part and motor.
6.3 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. 7.
2. Turn the pump upside down.
3. Check that all loose parts fall out of the pump.
Fig. 7
The non-return valve can be fitted in a Grundfos
service workshop.
WARNING
Electric shock
Death or serious 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.
Do not lower or lift the pump by means of
the motor cable.
TM02 8425 5203
TM01 2854 3804
Motor (P2)
[kW]
L
[mm]
0.70 120
1.15 102
1.55 84
1.85 66
TM01 4337 0199 TM01 4338 0199
SQE-NE is supplied without non-return
valve.
L
156

English (GB)
11
6.4 Fitting the cable plug to the motor
The following description is exclusively intended for
service personnel. If the motor cable is to be
replaced, see section 5.1 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. 8.
Fig. 8
5. Fit and tighten the four screws (1 - 1.5 Nm).
See fig. 8.
When the plug has been fitted, there must not be a
clearance between the motor and the cable plug.
6.5 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. 9.
Fig. 9
3. Fasten the cable guard to the pump suction
strainer with the two self-tapping screws
supplied. See fig. 10.
Fig. 10
WARNING
Electric shock
Death or serious personal injury
- The motor plug must under no
circumstances be removed by the user.
- The cable with plug must be fitted or
removed by an authorised Grundfos
service workshop or a similarly qualified
person.
TM02 9605 3504
TM02 9613 3504TM01 4427 0299

English (GB)
12
6.6 Cable sizing
Grundfos can supply submersible drop cables for
any type of installation.
The table values below are calculated from the
following formula:
The 4 % voltage drop is according to IEC 3-64, HD-
384 Series.
The calculation gives the following maximum cable
lengths at a supply voltage of 240 V:
The cross-section of the submersible drop
cable must be large enough to meet the
voltage requirements specified in section
5.1 General.
q= I x 2 x 100 x PF x L x ρ
U x ΔU
q = Cross-section of submersible drop cable
[mm2].
I = Rated maximum current of the motor [A].
PF = 1.0.
L = Length of submersible drop cable [m].
ρ= Specific resistance: 0.02 [Ωmm2/m].
U = Nominal voltage [V].
ΔU = Voltage drop [%] = 4 %.
Maximum cable length [m]
Motor
(P2) INCable size
[kW] [A] 1.5 mm22.1 mm2/
14 AWG 2.5 mm23.3 mm2/ 12 AWG 4 mm26 mm2
0.7 5.2 80 112 133 176 213 320
1.15 8.4 50 69 83 109 132 198
1.55 11.0 37 52 62 82 99 149
1.85 12 35 49 58 76 92 139

English (GB)
13
6.7 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.
For larger cross-sections, please contact Grundfos.
6.8 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.
Where flanged pipes are used, the flanges should
be slotted to take the submersible drop cable.
Figure 11 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.
Fig. 11
6.8.1 Cable clips
Cable clips must be fitted every 3 metres.
See fig. 11.
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.
Cable termination kit, type KM
Cross-sectional area Product number
1.5 to 6.0 mm296021473
For pumps fitted with plastic pipes, the
expansion of the pipes when loaded
should be taken into consideration, when
deciding on the installation depth of the
pump.
TM01 0480 4397
3 m
Max.
150 m
1
2

English (GB)
14
6.8.2 Installation depths
Maximum installation depth below the static water
level: 150 metres. See fig. 11.
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.
6.8.3 When lowering the pump into the borehole
It is recommended to secure the pump by an
unloaded straining wire. See fig. 11, pos. 2.
Slacken the straining wire so that it becomes
unloaded and lock it to the borehole seal by means
of wire locks.
7. 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.
8. Operation
8.1 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.
8.2 Selection of diaphragm tank and
setting of precharge pressure and
pressure switch
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. 12.
Fig. 12
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.
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.
The pump dry-running protection is
effective only within the recommended
duty range of the pump.
WARNING
Pressurised system
Death or serious personal injury
- The installation must be designed for
the maximum pump pressure.
TM00 6445 3795
Make sure that the selected pump can
deliver 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.
C
B
A
Q
Ppre
Pmin
Pcut-in
Pcut-out
Qmax
Diaphragm tank
Pressure
switch

English (GB)
15
8.3 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.
1 m head = 0.098 bar.
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 181818182433335050508080808080 31.5 36 50
40 8 1818181824335050508080808080 36 41 55
45 8 18181824333350505080808080 40.5 46 60
50 8 181818243350505080808080 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

English (GB)
16
8.4 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
9. 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.
9.1 Contaminated pumps
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.
Via the CU 300 or CU 301, the dry-running
stop limit of the MSE 3 motors can be
adjusted to match the actual application.
If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified as contaminated.

English (GB)
17
10. 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.
Fault Cause Remedy
1. The pump does
not run.
a) 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.
b) The ELCB or the voltage-operated
ELCB has tripped out.
Cut in the circuit breaker.
c) No power supply. Contact the power supply authorities.
d) The motor protection has cut off
the power supply due to overload.
Check whether the motor/pump is blocked.
e) The pump/submersible drop cable
is defective.
Repair/replace the pump/cable.
f) Overvoltage or undervoltage has
occurred.
Check the power supply.
2. The pump runs
but gives no
water.
a) The discharge valve is closed. Open the valve.
b) No water or too low water level in
borehole.
See item 3 a).
c) The non-return valve is stuck in its
closed position.
Pull out the pump and clean or replace the
valve.
d) The suction strainer is choked up. Pull out the pump and clean the strainer.
e) The pump is defective. Repair/replace the pump.
3. The pump runs at
reduced capacity.
a) 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.
b) The valves in the discharge pipe
are partly closed/blocked.
Check and clean/replace the valves,
if necessary.
c) The discharge pipe is partly
choked by impurities (ochre).
Clean/replace the discharge pipe.
d) The non-return valve of the pump
is partly blocked.
Pull out the pump and check/replace the
valve.
e) 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.
f) The pump is defective. Repair/replace the pump.
g) Leakage in the pipework. Check and repair the pipework.
h) The riser pipe is defective. Replace the riser pipe.
i) Undervoltage has occurred. Check the power supply.

English (GB)
18
10.1 Megging
Fig. 13
4. Frequent starts
and stops.
a) The differential of the pressure
switch between the start and stop
pressures is too small.
Increase the differential. However, the stop
pressure must not exceed the operating
pressure of the pressure tank, and the start
pressure should be high enough to ensure
sufficient water supply.
b) The water level electrodes or level
switches in the reservoir have not
been installed correctly.
Adjust the intervals of the electrodes/level
switches to ensure suitable time between
the cutting-in and cutting-out of the pump.
See installation and operating instructions
for the automatic devices used. If the
intervals between stop/start cannot be
changed via the automatics, the pump
capacity may be reduced by throttling the
discharge valve.
c) The non-return valve is leaking or
stuck half-open.
Pull out the pump and clean/replace the
non-return valve.
d) The supply voltage is unstable. Check the power supply.
e) The motor temperature gets too
high.
Check the water temperature.
Fault Cause Remedy
Megging of an installation incorporating
SQ/SQE pumps is not allowed, as the
built-in electronics may be damaged. See
fig. 13.
TM02 0689 5000
CC
U
U
U
PE
N
LC
C

English (GB)
19
11. Checking the power supply
12. Environment
During handling, operation, storage and transport,
all environment regulations dealing with the handling
of hazardous materials must be observed.
In case of doubt, please contact Grundfos or the
local authorities.
13. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
Subject to alterations.
WARNING
Electric shock
Death or serious 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.
1. Supply voltage
TM00 1371 4904
Measure the voltage (RMS)
between phase and neutral.
Connect the voltmeter to the
terminals at the connection.
The voltage should, when the motor is
loaded, be within the range specified in
section 5. Electrical connection.
Large variations in supply voltage indicate
poor power supply, and the pump should be
stopped until the defect has been remedied.
2. Current consumption
TM00 1372 5082
Measure the current (RMS)
while the pump is operating
at a constant discharge head
(if possible, at the capacity
where the motor is most
heavily loaded).
For maximum current, see
nameplate.
If the current exceeds the full load current,
there are the following possible faults:
• Poor connection in leads, possibly in the
cable joint.
• Too low supply voltage, see item 1.
L
N
PE
WARNING
Corrosive substance
Death or serious personal injury
- When the pump is taken out of
operation, it must be ensured that no
hazardous material is left in the pump/
motor and the riser pipe, which can be
injurious to persons and the
environment.

 (BG)
20
 (BG)    
    

.
1.   
1.    20
2.  21
2.1  21
3.   22
3.1  22
3.2     22
4.  22
4.1     22
4.2    23
4.3   / 23
5.   24
5.1   24
5.2    24
5.3    24
6.  25
6.1  25
6.2     25
6.3     25
6.4     
 26
6.5     26
6.6      27
6.7     28
6.8   28
7.  29
8.  29
8.1   29
8.2     
  
   29
8.3    
   30
8.4   31
9.    31
9.1   31
9.2  / 31
10.      32
10.1    33
11.   
 34
12.   34
13.    34
   
.  
    
  
   .
       
 8    
,   
     
,       
  
    
   
.
       
.   
     
     .

  , 
      
.

  , 
      
.

  , 
      
.