Grundfos SP Series Operating instructions

SP
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Other languages
http://net.grundfos.com/qr/i/98074911

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
Page
1. Symbols used in this document
2. Introduction
These instructions apply to Grundfos submersible pumps,
type SP, with submersible motors, types Grundfos MS/MMS or
Franklin 4"-8".
If the pump is fitted with a motor of another motor make than
Grundfos MS or MMS, note that the motor data may differ from
the data stated in these instructions.
3. Delivery and storage
3.1 Delivery
When the pump part and motor are supplied as separate units
(long pumps), fit the motor to the pump as described in section
7.1 Fitting the motor to the pump.
Do not expose the pump to unnecessary impact and shocks.
3.2 Storage
Storage temperature
Pump: -20 °C to +60 °C.
Motor: -20 °C to +70 °C.
The motors must be stored in a closed, dry and well ventilated
room.
The pump should not be exposed to direct sunlight.
If the pump has been unpacked, it should be stored horizontally,
adequately supported, or vertically to prevent misalignment of the
pump. Make sure that the pump cannot roll or fall over.
During storage, the pump can be supported as shown in fig. 1.
Fig. 1 Pump position during storage
3.2.1 Frost protection
If the pump has to be stored after use, it must be stored on a
frost-free location, or the motor liquid must be frost-proof.
1. Symbols used in this document 2
2. Introduction 2
3. Delivery and storage 2
3.1 Delivery 2
3.2 Storage 2
4. Applications 3
4.1 Pumped liquids 3
4.2 Sound pressure level 3
5. Preparations before installation 3
5.1 Checking the motor liquid 3
5.2 Positional requirements 5
5.3 Pump/motor diameter 5
5.4 Liquid temperatures/cooling 5
5.5 Pipe connection 6
6. Electrical connection 6
6.1 Frequency converter operation 7
6.2 Motor protection 7
6.3 Lightning protection 8
6.4 Cable sizing 8
6.5 Control of single-phase MS 402 motors 9
6.6 Connection of single-phase motors 9
6.7 Connection of three-phase motors 10
7. Installation 11
7.1 Fitting the motor to the pump 11
7.2 Removing and fitting the cable guard 12
7.3 Connecting the submersible drop cable 12
7.4 Riser pipe 12
7.5 Maximum installation depth below water level [m] 12
7.6 Cable clips 13
7.7 Lowering the pump 13
7.8 Installation depth 13
8. Startup and operation 13
8.1 Startup 13
8.2 Operation 14
9. Maintenance and service 14
10. Fault finding 15
11. Checking motor and cable 16
12. Disposal 16
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
If these safety instructions are not observed, it may
result in personal injury.
Warning
If these instructions are not observed, it may lead to
electric shock with consequent risk of serious
personal injury or death.
Caution
If these safety instructions are not observed, it may
result in malfunction or damage to the equipment.
Note
Notes or instructions that make the job easier and
ensure safe operation.
Note
The USB stick supplied with the product contains
installation and operating instructions in various
languages.
Caution
The pump should remain in the packing until it is
placed in vertical position during installation.
Handle the pump with care.
Note
The extra nameplate supplied with the pump should
be fixed at the installation site.
Caution
If MMS motors are stored, the shaft must be turned
by hand at least once a month. If a motor has been
stored for more than one year before installation, the
rotating parts of the motor must be dismantled and
checked before use.
TM00 1349 2495

English (GB)
3
4. Applications
Grundfos SP submersible pumps are designed for a wide range
of water supply and liquid transfer applications, such as the
supply of fresh water to private homes or waterworks, water
supply in horticulture and agriculture, drawdown of groundwater
and pressure boosting, and various industrial jobs.
The pump must be installed so that the suction interconnector is
completely submerged in the liquid. The pump can be installed
horizontally or vertically. See section 5.2 Positional requirements.
4.1 Pumped liquids
Clean, thin, non-explosive liquids without solid particles or fibres.
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 blockage.
If liquids with a viscosity higher than that of water are to be
pumped, contact Grundfos.
The pump versions SP A N, SP A R, SP N, SP R and SPE are
designed for liquids with higher aggressiveness than drinking
water.
The maximum liquid temperature appears from section 5.4 Liquid
temperatures/cooling.
4.2 Sound pressure level
The sound pressure level has been measured in accordance with
the rules laid down in the EC machinery directive 2006/42/EC.
Sound pressure level of pumps
The values apply to pumps submerged in water, without external
regulating valve.
Sound pressure level of motors
The sound pressure level of Grundfos MS and MMS motors is
lower than 70 dB(A).
Other motor makes: See installation and operating instructions
for these motors.
5. Preparations before installation
5.1 Checking the motor liquid
The motors are factory-filled with a special non-poisonous liquid
which is frost-proof down to -20 °C.
Refill liquid as described below.
5.1.1 Grundfos MS 4000 and MS 402 motors
The filling hole for motor liquid is placed in the following positions:
• MS 4000: in the top of the motor.
• MS 402: in the bottom of the motor.
1. Position the submersible pump as shown in fig. 2.
The filling screw must be at the highest point of the motor.
2. Remove the screw from the filling hole.
3. Inject liquid into the motor with the filling syringe until the
liquid runs back out of the filling hole. See fig. 2.
4. Replace the screw in the filling hole and tighten securely
before changing the position of the pump.
Torques
• MS 4000: 3.0 Nm.
• MS 402: 2.0 Nm.
The submersible pump is now ready for installation.
Fig. 2 Motor position during filling - MS 4000 and MS 402
Caution
When pumping liquids with a density higher than that
of water, motors with correspondingly higher outputs
must be used.
Pump type LpA [dB(A)]
SP 1A < 70
SP 2A < 70
SP 3A < 70
SP 5A < 70
SP 7 < 70
SP 9 < 70
SP 11 < 70
SP 14 < 70
SP 17 < 70
SP 30 < 70
SP 46 < 70
SP 60 < 70
SP 77 < 70
SP 95 < 70
SP 125 79
SP 160 79
SP 215 82
Warning
Before starting work on the product, switch off the
power supply. Make sure that the power supply
cannot be accidentally switched on.
Note
Check the level of motor liquid and refill if required.
Use clean water.
Caution
If frost protection is required, special Grundfos liquid
must be used to refill the motor. Otherwise clean
water may be used for refilling (however, never use
distilled water).
TM00 6423 0606
MS 4000 MS 402

English (GB)
4
5.1.2 Grundfos MS 6000 motors
• If the motor is delivered from stock, check the level of motor
liquid before fitting the motor to the pump. See fig. 3.
• When pumps are delivered direct from Grundfos, the level has
already been checked.
• Check the level in connection with service. See fig. 3.
The filling hole for motor liquid is placed at the top of the motor.
1. Position the submersible pump as shown in fig. 3. The filling
screw must be at the highest point of the motor.
2. Remove the screw from the filling hole.
3. Inject liquid into the motor with the filling syringe until the
liquid runs back out of the filling hole. See fig. 3.
4. Replace the screw in the filling hole and tighten securely
before changing the position of the pump.
Torque: 3.0 Nm.
The submersible pump is now ready for installation.
Fig. 3 Motor position during filling - MS 6000
5.1.3 Grundfos MMS 6, MMS 8000, MMS 10000 and
MMS 12000 motors
1. Place the motor at a 45 ° angle with the top of the motor
upwards. See fig. 4.
2. Unscrew the plug A and place a funnel in the hole.
3. Pour tap water into the motor until the motor liquid inside the
motor starts running out of A.
4. Remove the funnel and refit the plug A.
The submersible pump is now ready for installation.
Fig. 4 Motor position during filling - MMS
5.1.4 Franklin motors from 3 kW and up
Check the level of motor liquid in Franklin 4" and 6" motors by
measuring the distance from the bottom plate to the built-in
rubber diaphragm. The distance can be measured by inserting a
rule or a small rod through the hole until it touches the diaphragm.
See fig. 5.
Fig. 5 Measuring the distance from bottom plate to
diaphragm
The table below shows the correct distance from the outside of
the bottom plate to the diaphragm:
Fig. 6 Franklin motors
If the distance is not correct, carry out an adjustment as
described in section 5.1.5 Franklin motors.
TM03 8129 0507
Caution
Do not use motor liquid as it contains oil.
Caution
Before fitting the motor to a pump after a long period
of storage, lubricate the shaft seal by adding a few
drops of water and turning the shaft.
TM03 0265 3605
45°
45°
A
Caution
Take care not to damage the diaphragm.
TM00 1353 5092
Motor Dimension Distance
[mm]
Franklin 4", 0.25 - 3 kW
(fig. 6a) A8
Franklin 4", 3 - 7.5 kW
(fig. 6b) B16
Franklin 6", 4-45 kW
(fig. 6c) C1 35
Franklin 6", 4-22 kW
(fig. 6d) C2 59
TM00 6422 3695
6a 6b
6c 6d

English (GB)
5
5.1.5 Franklin motors
Check the level of motor liquid in Franklin 8" motors as follows:
1. Press out the filter in front of the valve at the top of the motor
using a screwdriver. If the filter is slotted, unscrew. Figure 7
shows the position of the filling valve.
2. Press the filling syringe against the valve and inject the liquid.
See fig. 7. If the valve cone is depressed too far, it may be
damaged thus causing the valve to leak.
3. Remove any air in the motor by pressing the point of the filling
syringe lightly against the valve.
4. Repeat the process of injecting liquid and releasing air until
the liquid starts running out or the diaphragm is in its correct
position (Franklin 4" and 6").
5. Refit the filter.
The submersible pump is now ready for installation.
Fig. 7 Position of filling valve
5.2 Positional requirements
Depending on motor type, the pump can be installed either
vertically or horizontally. A complete list of motor types suitable
for horizontal installation is shown in section 5.2.1 Motors suitable
for horizontal installation.
If the pump is installed horizontally, the discharge port should
never fall below the horizontal plane. See fig. 8.
Fig. 8 Positional requirements
If the pump is installed horizontally, e.g. in a tank, we recommend
that you fit it in a flow sleeve.
5.2.1 Motors suitable for horizontal installation
When Franklin 4" motors up to and including 2.2 kW are started
more than 10 times a day, we recommend that you incline the
motor at least 15 ° above the horizontal plane in order to minimise
wearing of the upthrust disc.
5.3 Pump/motor diameter
We recommend that you check the borehole with an inside
calliper to ensure unobstructed passage.
5.4 Liquid temperatures/cooling
The maximum liquid temperature and the minimum flow velocity
past the motor appear from the table below.
We recommend that you install the motor above the well screen
in order to achieve proper motor cooling.
If there is a risk of sediment build-up, such as sand, around the
motor, use a flow sleeve in order to ensure proper cooling of the
motor.
TM00 1354 5092
Warning
If the pump is to be installed in a position where it is
accessible, the coupling must be suitably isolated
from human touch. The pump can for instance be
built into a flow sleeve.
TM00 1355 5092
Allowed
Not allowed
Motor
Output power
50 Hz Output power 60 Hz
[kW] [kW]
MS All All
MMS 6 5.5 - 37 5.5 - 37
MMS 8000 22-110 22-110
MMS 10000 75-190 75-190
MMS 12000 147-250 147-250
Caution
During operation, the suction interconnector of the
pump must always be completely submerged in the
liquid. Make sure that the NPSH values are fulfilled.
Warning
If the pump is used for pumping hot liquids (40 to 60
°C), make sure that persons cannot come into
contact with the pump and the installation, e.g. by
installing a guard.
Caution
In cases where the stated flow velocity cannot be
achieved, a flow sleeve must be installed.

English (GB)
6
5.4.1 Maximum liquid temperature
Out of consideration for the rubber parts in pump and motor, the
liquid temperature must not exceed 40 °C (~ 105 °F). See also
the table below.
The pump can operate at liquid temperatures between 40 °C and
60 °C (~ 105 °F and 140 °F) provided that all rubber parts are
replaced every third year.
5.5 Pipe connection
If noise may be transmitted to the building through the pipework,
we recommend that you use plastic pipes.
When using plastic pipes, secure the pump by an unloaded
straining wire.
When connecting plastic pipes, use a compression coupling
between the pump and the first pipe section.
6. Electrical connection
The supply voltage, rated maximum current and cos φappear
from the loose data plate which must be fitted close to the
installation site.
The required voltage quality for MS and MMS 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).
Check also that there is voltage symmetry in the power supply
lines, i.e. same difference of voltage between the individual
phases. See section 11. Checking motor and cable, item 2.
If MS motors with a built-in temperature transmitter (Tempcon)
are not installed together with a MP 204 or similar Grundfos
motor protection, they must be connected to a 0.47 μF capacitor
approved for phase-phase operation (IEC 384-14) to meet the EC
EMC directive (2004/108/EC). The capacitor must be connected
to the two phases to which the temperature transmitter is
connected. See fig. 9.
Fig. 9 Connection of capacitor
The motors are wound for direct-on-line starting or star-delta
starting, and the starting current is between four and six times the
rated current of the motor.
The run-up time of the pump is only about 0.1 second.
Direct-on-line starting is therefore normally approved by the
power supply company.
Motor
Installation
Flow past
the motor Vertical Horizontal
Grundfos
MS 402
MS 4000
MS 6000
0.15 m/s 40 °C
(~ 105 °F)
40 °C
(~ 105 °F)
Grundfos
MS 4000I* 0,15 m/s 60 °C
(~ 140 °F)
Flow sleeve
recommended
60 °C
(~ 140 °F)
Flow sleeve
recommended
Grundfos
MS 6000I* 1.00 m/s
Grundfos
MMS
0.15 m/s 25 °C
(~ 77 °F)
25 °C
(~ 77 °F)
0.50 m/s 30 °C
(~ 86 °F)
30 °C
(~ 86 °F)
Franklin
4" 0.08 m/s 30 °C
(~ 85 °F)
30 °C
(~ 85 °F)
Franklin
6" and 8" 0.16 m/s 30 °C
(~ 85 °F)
30 °C
(~ 85 °F)
* At an ambient pressure of minimum 1 bar (1 MPa).
Note
37 kW MMS 6, 110 kW MMS 8000 and 170 kW
MMS 10000: The maximum operational liquid
temperature is 5 °C lower than the values stated in
the above table.
190 kW MMS 10000: The temperature is 10 °C lower.
Note
We recommend plastic pipes for 4" pumps only.
Warning
Make sure that the plastic pipes are suitable for the
actual liquid temperature and the pump pressure.
Warning
During electrical installation, make sure that the
power supply cannot be accidentally switched on.
Warning
The electrical installation should be carried out by an
authorised person in accordance with local
regulations.
Warning
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.
TM00 7100 0696
Colours of the leads
Lead Flat cable Single leads
1 = L1 Brown Black
2 = L2 Black Yellow
3 = L3 Grey Red
4 = PE Yellow/green Green

English (GB)
7
6.1 Frequency converter operation
6.1.1 Grundfos motors
Three-phase Grundfos motors can be connected to a frequency
converter.
If a temperature transmitter is required, Grundfos offers a Pt100
or Pt1000 sensor for the submersible motor.
To avoid damage to the pump part, the motor must stop when the
pump flow falls below 0.1 x nominal flow.
Depending on the frequency converter type, it may expose the
motor to detrimental voltage peaks.
We recommend that you protect other motors against voltage
peaks higher than 850 V.
The above disturbance can be abated by installing an RC filter
between the frequency converter and the motor.
Possible increased acoustic noise from the motor can be abated
by installing an LC filter which will also eliminate voltage peaks
from the frequency converter.
We recommend that you install an LC filter when using a
frequency converter. See section 6.7.6 Frequency converter
operation.
For further details, contact your frequency converter supplier or
Grundfos.
6.1.2 Other motor makes than Grundfos
Contact Grundfos or the motor manufacturer.
6.2 Motor protection
6.2.1 Single-phase motors
Single-phase MS 402 motors incorporate a thermal switch and
require no additional motor protection.
Single-phase MS 4000 motors must be protected. A protective
device can either be incorporated in a control box or be separate.
Franklin 4" PSC motors must be connected to a motor-protective
circuit breaker.
6.2.2 Three-phase motors
MS motors are available with or without a built-in temperature
transmitter.
The following motors must be protected by a motor-protective
circuit breaker with thermal relay, or a MP 204 and contactor(s):
• motors with a built-in and intact temperature transmitter
• motors with or without a defective temperature transmitter
• motors with or without a Pt100 sensor.
MMS motors have no built-in temperature transmitter.
The Pt100 and the Pt1000 sensor are available as an accessory.
6.2.3 Required settings of motor-protective circuit breaker
For cold motors, the tripping time of the motor-protective circuit
breaker must be less than 10 seconds at 5 times the rated
maximum current of the motor. During normal operating
conditions the motor must be running at full speed in less than
3 seconds.
In order to ensure optimum motor protection, the motor-protective
circuit breaker should be set as follows:
1. Set the motor-protective circuit breaker to the rated maximum
current of the motor.
2. Start the pump and let it run for half an hour at normal
performance.
3. Slowly grade down the scale indicator until the motor trip point
is reached.
4. Increase the setting by 5 %.
The highest permissible setting is the rated maximum current of
the motor.
For motors wound for star-delta starting, the motor-protective
circuit breaker should be set as above, but the maximum setting
should be rated maximum current x 0.58.
The highest permissible startup time for star-delta starting or
autotransformer starting is 2 seconds.
Caution
If an MS motor with temperature transmitter is
connected to a frequency converter, a fuse
incorporated in the transmitter will melt and the
transmitter will be inactive. The transmitter cannot be
reactivated. This means that the motor will operate
like a motor without a temperature transmitter.
Caution
The motor should not run at a frequency higher than
the rated frequency (50 or 60 Hz) during frequency
converter operation. In connection with pump
operation, never reduce the frequency (and
consequently the speed) to such a level that the
necessary flow of cooling liquid past the motor is no
longer ensured.
Warning
MS 402 motors for supply voltages up to and
including 440 V (see motor nameplate) must be
protected against voltage peaks higher than
650 V (peak value) between the supply terminals.
Warning
When the motor has been thermally switched off, the
motor terminals are still live. When the motor has
cooled sufficiently, it will restart automatically.
Caution
If this requirement is not met, the motor warranty will
be invalidated.

English (GB)
8
6.3 Lightning protection
The installation can be fitted with a special overvoltage protective
device to protect the motor from voltage surges in the power
supply lines when lightning strikes somewhere in the area.
See fig. 10.
Fig. 10 Fitting an overvoltage protective device
The overvoltage protective device will not, however, protect the
motor against a direct stroke of lightning.
The overvoltage protective device should be connected to the
installation as close as possible to the motor and always in
accordance with local regulations. Ask Grundfos for lightning
protective devices.
MS 402 motors, however, require no further lightning protection
as they are highly insulated.
A special cable termination kit with a built-in overvoltage
protective device is available for Grundfos 4" motors
(product No 799911 or 799912).
6.4 Cable sizing
Make sure that the submersible drop cable can withstand
permanent submersion in the actual liquid and at the actual
temperature.
The cross-section (q) of the cable must meet the following
requirements:
The submersible drop cable must be sized to the rated maximum
current (In) of the motor.
The cross-section must be sufficient to make a voltage drop over
the cable acceptable.
Grundfos supplies submersible drop cables for a wide range of
installations. For correct cable sizing, Grundfos offers a cable
sizing tool on the USB stick supplied with the motor.
Fig. 11 Cable sizing tool
The sizing tool provides an accurate calculation of the voltage
drop at a given cross-section on the basis of the following
parameters:
• cable length
• operating voltage
• full-load current
• power factor
• ambient temperature.
You can calculate the voltage drop both for direct-on-line and
star-delta starting.
In order to minimise operating losses, the cable cross-section
may be increased. This is only cost-efficient if the borehole
provides the necessary space, and if the operating time of the
pump is long. The cable sizing tool also provides a power loss
calculator that shows the potential savings of an increased
cross-section.
As an alternative to the cable sizing tool, select the cross-section
on the basis of the current values of the given cables.
The cross-section of the submersible drop cable must be large
enough to meet the voltage quality requirements specified in
section 6. Electrical connection.
Determine the voltage drop for the cross-section of the
submersible drop cable by means of the diagrams on pages 17 to
20.
Use the following formula:
I = Rated maximum current of the motor.
For star-delta starting, I = rated maximum current of the motor x
0.58.
Lx = Length of cable converted to a voltage drop of 1 % of the
nominal voltage.
q = Cross-section of submersible drop cable.
Draw a straight line between the actual I-value and the Lx-value.
Where the line intersects the q-axis, select the cross-section that
lies right above the intersection.
The diagrams are made on the basis of the formulas:
Single-phase submersible motor
Three-phase submersible motor
TM00 1357 3605
Caution
Submersible motor cables are dimensioned for
submersion in liquid, and will not necessarily have
sufficient cross-section to be in free air.
TM05 8770 2613
825045 825017
L1
L2
PE
L3 L
PE
N
Three-phase Single-phase
Lx = length of drop cable
permissible voltage drop in %
L = U ×ΔU
I ×2 ×100 ×
L = U ×ΔU
I ×1.73 ×100 ×
L = Length of submersible drop cable [m]
U = Rated voltage [V]
ΔU = Voltage drop [%]
I = Rated maximum current of the motor [A]
cos φ=0.9
ρ= Specific resistance: 0.02 [Ωmm2/m]
q = Cross-section of submersible drop cable [mm2]
sin φ= 0.436
Xl = Inductive resistance: 0.078 x 10-3 [Ω/m].
cos 
q
---
sin XI+


cos 
q
---
sin XI+



English (GB)
9
6.5 Control of single-phase MS 402 motors
If a compressor is included in a control system together with an
ochre filter, the compressor will run continuously once the motor
protection has cut out the motor, unless other special precautions
have been taken.
6.6 Connection of single-phase motors
6.6.1 2-wire motors
MS 402 2-wire motors incorporate motor protection and a starter
device and can therefore be connected direct to the mains.
See fig. 12.
Fig. 12 2-wire motors
6.6.2 PSC motors
The PSC motors are connected to the mains via a run capacitor
which should be sized for continuous operation.
Select the correct capacitor size from the table below:
MS 402 PSC motors incorporate motor protection and should be
connected to the mains as shown in fig. 13.
Fig. 13 PSC motors
See www.franklin-electric.com and fig. 14.
Fig. 14 Franklin motors
6.6.3 3-wire motors
MS 4000 3-wire motors must be connected to the mains via a
Grundfos SA-SPM 5 (60 Hz), 7 or 8 (50 Hz) control box
incorporating motor protection.
MS 402 3-wire motors incorporate motor protection and should be
connected to the mains via a Grundfos control box SA-SPM 2, 3
or 5 (60 Hz), 7 or 8 (50 Hz) without motor protection.
Warning
The single-phase MS 402 motor incorporates motor
protection which cuts out the motor in case of
excessive winding temperatures while the motor is
still supplied with voltage. Allow for this, when the
motor forms part of a control system.
TM00 1358 5092
Motor
[kW] Capacitor [μF] 400 V, 50 Hz
0.25 12.5
0.37 16
0.55 20
0.75 30
1.10 40
1.50 50
2.20 75
Yellow/green Black Black
TM00 1359 5092TM00 1361 1200
Yellow/green Grey Black Brown
C
LN
M
1
Yellow/green Black Grey Brown

English (GB)
10
6.7 Connection of three-phase motors
Three-phase motors must be protected.
See section 6.2.2 Three-phase motors.
For electrical connection via the MP 204, see the separate
installation and operating instructions for this unit.
When a conventional motor-protective circuit breaker is being
used, the electrical connection should be carried out as described
below.
6.7.1 Checking the direction of rotation
When the pump has been connected to the power supply, check
the direction of rotation:
1. Start the pump and measure quantity of water and head.
2. Stop the pump and interchange two phases.
3. Start the pump and measure quantity of water and head.
4. Stop the pump.
5. Compare the two results. The connection giving the larger
quantity of water and the higher head is the correct one.
6.7.2 Grundfos motors - direct-on-line starting
The connection of Grundfos motors wound for direct-on-line
starting appears from the table below and fig. 15.
Check the direction of rotation as described in section
6.7.1 Checking the direction of rotation.
Fig. 15 Grundfos motors - direct-on-line starting
6.7.3 Grundfos motors - star-delta starting
The connection of Grundfos motors wound for star-delta starting
appears from the table below and fig. 16.
Check the direction of rotation as described in section
6.7.1 Checking the direction of rotation.
Fig. 16 Grundfos motors wound for star-delta starting
If direct-on-line starting is required, the motors should be
connected as shown in fig. 17.
Fig. 17 Grundfos motors wound for star-delta starting -
direct-on-line starting
Caution
The pump must not be started until the suction
interconnector has been completely submerged in
the liquid.
Mains Cable/connection
Grundfos 4" and 6" motors
PE PE (yellow/green)
L1 U (brown)
L2 V (black)
L3 W (grey)
TM03 2099 3705
L1
PE WVU
PE
M
L3L2
3
Connection Grundfos 6" motors
PE Yellow/green
U1 Brown
V1 Black
W1 Grey
W2 Brown
U2 Black
V2 Grey
TM03 2100 3705TM03 2101 3705
L2L1
M
L3PE
W2 U2 V2
PE U1 W1V1
3
L2L1
M
L3PE
W2 U2 V2
PE U1 W1V1
3

English (GB)
11
6.7.4 Connection in the case of unidentified cable
marking/connection (Franklin motors)
If you do not know where the individual leads are to be connected
to the mains in order to ensure the correct direction of rotation,
proceed as follows:
Motors wound for direct-on-line starting
Connect the pump to the mains as is expected to be right.
Then check the direction of rotation as described in section
6.7.1 Checking the direction of rotation.
Motors wound for star-delta starting
Determine the windings of the motor by means of an ohmmeter
and name the lead sets for the individual windings accordingly:
U1-U2, V1-V2, W1-W2. See fig. 18.
Fig. 18 Unidentified cable marking/connection - motors wound
for star-delta starting
If star-delta starting is required, connect the leads as shown in
fig. 16.
If direct-on-line starting is required, connect the leads as shown
in fig. 17.
Then check the direction of rotation as described in section
6.7.1 Checking the direction of rotation.
6.7.5 Soft starter
We only recommend the use of soft starters which control the
voltage on all three phases and which are provided with a bypass
switch.
Ramp times: Maximum 3 seconds.
For further details, contact your soft starter supplier or Grundfos.
6.7.6 Frequency converter operation
Three-phase MS motors can be connected to a frequency
converter.
Permissible frequency ranges: 30-50 Hz and 30-60 Hz.
Ramp times: Maximum 3 seconds for start and stop.
Depending on the type, the frequency converter may cause
increased acoustic noise from the motor. Furthermore, it may
expose the motor to detrimental voltage peaks. This can be
abated by installing an LC filter between the frequency converter
and the motor.
For further details, contact your frequency converter supplier or
Grundfos.
7. Installation
We recommend that you first fit a 50 cm long pipe to the pump to
facilitate handling of the pump during installation.
Fig. 19 Lifting the pump into vertical position
7.1 Fitting the motor to the pump
When the pump part and the motor are supplied as separate units
(long pumps), fit the motor to the pump as follows:
1. Use pipe clamps when handling the motor.
2. Place the motor in vertical position at the borehole seal.
See fig. 20.
Fig. 20 Motor in vertical position
TM00 1367 5092
Note
To enable the monitoring of the motor temperature,
we recommend that you install a Pt100/Pt1000
sensor together with a PR5714 or CU 220 (50 Hz).
Caution
Lift the pump to vertical position before removing it
from the wooden box.
TM05 1617 3311TM00 5259 2402

English (GB)
12
3. Lift the pump part by means of pipe clamps fitted to the
extension pipe. See fig. 21.
Fig. 21 Lifting the pump into position
4. Place the pump part on top of the motor.
5. Fit and tighten the nuts. See table below.
The bolts and nuts securing the straps to the pump must be
cross-tightened to the following torques:
When fitting the motor to the pump part, cross-tighten the nuts to
the following torques:
7.2 Removing and fitting the cable guard
If the cable guard is screwed on to the pump, it should be
removed and fitted by means of screws.
7.3 Connecting the submersible drop cable
7.3.1 Grundfos motors
Before connecting the submersible drop cable to the motor, make
sure that the cable socket is clean and dry.
To facilitate the connection of the cable, lubricate the rubber parts
of the cable plug with non-conducting silicone paste.
Tighten the screws holding the cable to these torques [Nm]:
MS 402: 2.0
MS 4000: 3.0
MS 6000: 4.5
MMS 6: 20
MMS 8000: 18
MMS 10000: 18
MMS 12000: 15
7.4 Riser pipe
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.
The threaded joints on the riser pipe must all be well cut and fit
together to ensure that they do not work loose when subjected to
torque reaction caused by the starting and stopping of the pump.
The thread on the first section of the riser pipe which is to be
screwed into the pump should not be longer than the threads in
the pump.
If noise may be transmitted to the building through the pipework,
we recommend that you use plastic pipes.
When plastic pipes are used, secure the pump by an unloaded
straining wire to be fastened to the discharge chamber of the
pump. See fig. 22.
Fig. 22 Fixing the straining wire
When connecting plastic pipes, use a compression coupling
between the pump and the first pipe section.
Where flanged pipes are used, the flanges should be slotted to
take the submersible drop cable and a water indicator hose, if
fitted.
7.5 Maximum installation depth below water level [m]
Grundfos MS 402: 150
Grundfos MS 4000: 600
Grundfos MS 6000: 600
Grundfos MMS: 600
Franklin motors: 350
TM02 5263 2502
Caution
Make sure that the coupling between the pump and
motor engages properly.
Bolt/nut Torque
[Nm]
M8 18
M10 35
M12 45
M16 120
SP 215, 50 Hz, with more than 8 stages
SP 215, 60 Hz, with more than 5 stages 150
Staybolt diameter Torque
[Nm]
5/16 UNF 18
1/2 UNF 50
M8 18
M12 70
M16 150
M20 280
Caution
Make sure that the pump chambers are aligned when
assembly has been completed.
Caution
Make sure that the pump chambers are aligned when
the cable guard has been fitted.
Note
We recommend plastic pipes for 4" pumps only.
TM00 1368 2298

English (GB)
13
7.6 Cable clips
Fit cable clips every 3 metres to fix the submersible drop cable
and the straining wire, if fitted, to the riser pipe of the pump.
Grundfos supplies cable clip sets on request.
1. Cut off the rubber band so that the piece with no slit becomes
as long as possible.
2. Insert a button in the first slit.
3. Position the wire alongside the submersible drop cable as
shown in fig. 23.
Fig. 23 Fitting the cable clips
4. Wind the band once around the wire and the cable. Then wind
it tightly at least twice around the pipe, wire and the cable.
5. Push the slit over the button and cut off the band.
Where large cable cross-sections are used, it will be necessary to
wind the band several times.
Where plastic pipes are used, some slackness must be left
between each cable clip as plastic pipes expand when loaded.
When flanged pipes are used, the cable clips should be fitted
above and below each joint.
7.7 Lowering the pump
We recommend that you check the borehole by means of an
inside calliper before lowering the pump to ensure unobstructed
passage.
Lower the pump carefully into the borehole, taking care not to
damage the motor cable and the submersible drop cable.
7.8 Installation depth
The dynamic water level should always be above the suction
interconnector of the pump. See section 5.2 Positional
requirements and fig. 24.
Minimum inlet pressure is indicated in the NPSH curve for the
pump. The minimum safety margin should be 1 metre head.
We recommend that you install the pump so that the motor part is
above the well screen in order to ensure optimum cooling.
See section 5.4 Liquid temperatures/cooling.
When the pump has been installed to the required depth, the
installation should be finished by means of a borehole seal.
Slacken the straining wire so that it becomes unloaded and lock it
to the borehole seal by means of wire locks.
8. Startup and operation
8.1 Startup
When the pump has been connected correctly and it is
submerged in the liquid to be pumped, it should be started with
the discharge valve closed off to approximately 1/3 of its
maximum volume of water.
Check the direction of rotation as described in section
6.7.1 Checking the direction of rotation.
If there are impurities in the water, open the valve gradually as
the water becomes clearer. Do not stop the pump until the water
is completely clean, as otherwise the pump parts and the
non-return valve may become blocked.
As the valve is being opened, check the drawdown of the water
level to ensure that the pump always remains submerged.
The dynamic water level should always be above the suction
interconnector of the pump. See section 5.2 Positional
requirements and fig. 24.
Fig. 24 Comparison of various water levels
L1: Minimum installation depth below dynamic water level.
We recommend minimum 1 metre.
L2: Depth to dynamic water level.
L3: Depth to static water level.
L4: Drawdown. This is the difference between the dynamic and
the static water levels.
L5: Installation depth.
If the pump can pump more than yielded by the well, we
recommend that you install the Grundfos MP 204 motor protector
or some other type of dry-running protection.
If no water level electrodes or level switches are installed, the
water level may be drawn down to the suction interconnector of
the pump and the pump will then draw in air.
TM00 1369 5092
Caution
Do not lower or lift the pump by means of the motor
cable.
Note
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.
TM00 1041 3695
Caution
Long time of operation with water containing air may
damage the pump and cause insufficient cooling of
the motor.
L2 L3
L1
L5
L4

English (GB)
14
8.2 Operation
8.2.1 Minimum flow rate
To ensure the necessary cooling of the motor, the pump flow rate
should never be set so low that the cooling requirements in
section 5.4 Liquid temperatures/cooling cannot be met.
8.2.2 Frequency of starts and stops
9. Maintenance and service
All pumps are easy to service.
Service kits and service tools are available from Grundfos.
The pumps can be serviced at a Grundfos service centre.
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.
Possible costs of returning the pump are paid by the customer.
Motor type Number of starts
MS 402
• Minimum 1 per year is
recommended.
• Maximum 100 per hour.
• Maximum 300 per day.
MS 4000
• Minimum 1 per year is
recommended.
• Maximum 100 per hour.
• Maximum 300 per day.
MS 6000
• Minimum 1 per year is
recommended.
• Maximum 30 per hour.
• Maximum 300 per day.
MMS6
PVC windings
• Minimum 1 per year is
recommended.
• Maximum 3 per hour.
• Maximum 40 per day.
PE/PA windings
• Minimum 1 per year is
recommended.
• Maximum 10 per hour.
• Maximum 70 per day.
MMS 8000
PVC windings
• Minimum 1 per year is
recommended.
• Maximum 3 per hour.
• Maximum 30 per day.
PE/PA windings
• Minimum 1 per year is
recommended.
• Maximum 8 per hour.
• Maximum 60 per day.
MMS 10000
PVC windings
• Minimum 1 per year is
recommended.
• Maximum 2 per hour.
• Maximum 20 per day.
PE/PA windings
• Minimum 1 per year is
recommended.
• Maximum 6 per hour.
• Maximum 50 per day.
MMS 12000
PVC windings
• Minimum 1 per year is
recommended.
• Maximum 2 per hour.
• Maximum 15 per day.
PE/PA windings
• Minimum 1 per year is
recommended.
• Maximum 5 per hour.
• Maximum 40 per day.
Warning
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)
15
10. Fault finding
Fault Cause Remedy
1. The pump does not run. a) The fuses are blown. Replace the blown fuses. If the new ones blow too,
check the electric installation and the submersible drop
cable.
b) The ELCB or the voltage-operated ELCB
has tripped. Cut in the circuit breaker.
c) No power supply. Contact the power supply company.
d) The motor-protective circuit breaker has
tripped.
Reset the motor-protective circuit breaker
(automatically or possibly manually).
Check the voltage if it trips again. If the voltage is okay,
see items 1e to 1h.
e) The motor-protective circuit
breaker/contactor is defective. Replace the motor-protective circuit breaker/contactor.
f) Starter device is defective. Repair or replace the starter device.
g) The control circuit has been interrupted or is
defective. Check the electric installation.
h) The dry-running protection has cut off the
power supply to the pump due to low water
level.
Check the water level. If it is okay, check the water
level electrodes/level switch.
i) The pump/submersible drop cable is
defective. Repair or replace the pump/cable.
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 3a.
c) The non-return valve is stuck in closed
position. Pull out the pump and clean or replace the valve.
d) The suction strainer is blocked. Pull out the pump and clean the strainer.
e) The pump is defective. Repair or replace the pump.
3. The pump runs at
reduced performance.
a) The drawdown is larger than anticipated. Increase the installation depth of the pump, throttle the
pump or install a pump with a smaller performance.
b) Wrong direction of rotation. See section 6.7.1 Checking the direction of rotation.
c) The valves in the discharge pipe are partly
closed/blocked. Clean or replace the valves.
d) The discharge pipe is partly blocked by
impurities (ochre). Clean or replace the pipe.
e) The non-return valve of the pump is partly
blocked. Pull out the pump and clean or replace the valve.
f) The pump and the riser pipe are partly
blocked by impurities (ochre).
Pull out the pump and clean or replace it.
Clean the pipes.
g) The pump is defective. Repair or replace the pump.
h) Leakage in the pipework. Check and repair the pipework.
i) The riser pipe is defective. Replace the pipe.
4. Frequent starts and
stops.
a) The differential of the pressure switch
between the start and stop pressures is too
small.
Increase the differential. 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 electrodes/level switches. If the
intervals between stop/start cannot be changed via the
automatics, the pump performance 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 or replace the valve.
d) The tank precharge pressure is too small. Adjust the tank precharge pressure in accordance with
its installation and operating instructions.
e) The tank is too small. Increase the capacity of the tank by replacing or
supplementing with another tank.
f) The diaphragm of the tank is defective. Check the diaphragm tank.

English (GB)
16
11. Checking motor and cable
12. 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.
1. Supply voltage
TM00 1371 5092
Measure the voltage between the phases
by means of a voltmeter.
On single-phase motors, measure
between phase and neutral or between
two phases, depending on the type of
supply. Connect the voltmeter to the
terminals in the motor-protective circuit
breaker.
The voltage should, when the motor is loaded, be within the
range specified in section 6. Electrical connection.
The motor may burn if there are larger variations in voltage.
Large variations in voltage indicate poor power supply, and
the pump should be stopped until the defect has been
remedied.
2. Current consumption
TM00 1372 5092
Measure the amps of each phase while
the pump is operating at a constant
discharge head (if possible, at the
performance where the motor is most
heavily loaded). For maximum operating
current, see nameplate.
On three-phase motors, the difference between the current in
the phase with the highest consumption and the current in the
phase with the lowest consumption should not exceed 5 %.
If so, or if the current exceeds the rated current, there are the
following possible faults:
• The contacts of the motor-protective circuit breaker are
burnt.
Replace the contacts or the control box for single-phase
operation.
• Poor connection in leads, possibly in the cable joint.
See item 3.
• Too high or too low supply voltage. See item 1.
• The motor windings are short-circuited or partly disjointed.
See item 3.
• Damaged pump is causing the motor to be overloaded.
Pull out the pump for overhaul.
• The resistance value of the motor windings deviates too
much (three-phase). Move the phases in phase order to a
more uniform load. If this does not help, see item 3.
Items 3 and 4: Measurement is not necessary when the supply voltage and the current consumption are normal.
3. Winding resistance
TM00 1373 5092
Disconnect the submersible drop cable
from the motor-protective circuit breaker.
Measure the winding resistance between
the leads of the drop cable.
For three-phase motors, the deviation between the highest
and the lowest value should not exceed 10 %. If the deviation
is higher, pull out the pump. Measure motor, motor cable and
drop cable separately, and repair or replace defective parts.
Note: The operating winding of single-phase 3-wire motors
will assume the lowest resistance value.
4. Insulation resistance
TM00 1374 5092
Disconnect the submersible drop cable
from the motor-protective circuit breaker.
Measure the insulation resistance from
each phase to earth (frame). Make sure
that the earth connection was made
carefully.
If the insulation resistance is less than 0.5 MΩ, the pump
should be pulled out for motor or cable repair.
Local regulations may specify other values for the insulation
resistance.

Appendix
17
Appendix 1
TM00 1346 5092
Example:
U = 3 x 400 V
I=40 A
L = 140 m
U=2%
Lx L
U
-------- 140
2 %
----------70 m q25 mm2 == = =
I = 40 A
U = 2
%
U = 3 x 400 V
L = 140 m

Appendix
18
TM00 1345 5092
Example:
U = 3 x 380 V
I=10 A
L = 120 m
U=2%
Lx L
U
-------- 120
2 %
----------60 m q6mm
2
== = =
I = 10 A
U = 2
%
U = 3 x 380 V
L = 120 m

Appendix
19
TM00 1348 5092
Example:
U = 3 x 220 V
I=5 A
L = 105 m
U=3%
Lx L
U
--------105
3 %
----------35 m q2,5 mm2
== = =
I = 5 A
U = 3
%
U = 3 x 220 V
L = 105 m

Appendix
20
TM00 1347 5092
Example:
U = 3 x 415 V
I=100 A
L = 150 m
U=3%
Lx L
U
--------150
3 %
----------50 m q50 mm2 == = =
I = 100 A
U = 3
%
U = 3 x 415 V
L = 150 m