Grundfos SRG 60 Hz User manual

SRG
50 Hz
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

2

3
Table of contents
SRG
English (GB)
Installation and operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Čeština (CZ)
Montážní a provozní návod. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Deutsch (DE)
Montage- und Betriebsanleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Dansk (DK)
Monterings- og driftsinstruktion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Eesti (EE)
Paigaldus- ja kasutusjuhend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Español (ES)
Instrucciones de instalación y funcionamiento . . . . . . . . . . . . . . . . . . . . . . . . . 95
Français (FR)
Notice d'installation et de fonctionnement. . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Ελληνικά (GR)
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Hrvatski (HR)
Montažne i pogonske upute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Magyar (HU)
Telepítési és üzemeltetési utasítás. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Italiano (IT)
Istruzioni di installazione e funzionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Lietuviškai (LT)
rengimo ir naudojimo instrukcija . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Nederlands (NL)
Installatie- en bedieningsinstructies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Polski (PL)
Instrukcja montau i eksploatacji . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Português (PT)
Instruções de instalação e funcionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Română(RO)
Instruciuni de instalare i utilizare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Srpski (RS)
Uputstvo za instalaciju i rad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
Русский (RU)
    . . . . . . . . . . . . . . . . . . . . . . . . . . 311

Table of contents
4
SRG
Svenska (SE)
Monterings- och driftsinstruktion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
Slovensko (SI)
Navodila za montažo in obratovanje. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Slovenčina (SK)
Návod na montáž a prevádzku . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
Türkçe (TR)
Montaj ve kullanım kılavuzu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385
中文 (CN)
安装和使用说明书 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404
Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Operating manual EAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424

English (GB)
5
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe Grundfos SRG 50 Hz recirculation pumps.
Sections 1-5 give the information necessary to be
able to unpack, install and start up the product in a
safe way.
Sections 6-10 give important information about the
product, as well as information on service, fault
finding, and disposal of the product.
CONTENTS
Page
1. General information
This booklet includes instructions for installing,
starting-up and servicing Grundfos 50 Hz
recirculation pumps, type SRG, designed for transfer
of liquids of low to medium viscosity ( ≤500 mPas)
from one tank to another.
1.1 Symbols used in this document
1. General information 5
1.1 Symbols used in this document 5
2. Safety instructions 6
3. Receiving the product 7
3.1 Transporting the product 7
3.2 Inspecting the product 7
3.3 Storing the product 7
4. Installing the product 7
4.1 Positioning 7
4.2 Torques 8
4.3 Mechanical installation 8
4.4 Electrical connection 10
4.5 Electrical protection 13
4.6 Protection against electro-chemical
corrosion 14
5. Starting-up the product 15
6. Product introduction 15
6.1 Applications 15
6.2 Identification 16
7. Servicing the product 17
7.1 Contaminated pump 17
7.2 Service chart 18
7.3 Oil 19
7.4 Changing the oil 19
8. Fault finding the product 20
9. Technical data 22
9.1 General technical data 22
9.2 Motor 22
9.3 Gearbox 22
9.4 Shaft seals 22
9.5 Impeller 22
9.6 Sound pressure level 22
10. Disposing of the product 22
Warning
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local
regulations and accepted codes of good
practice.
Warning
The use of this product requires
experience with and knowledge of the
product.
Persons with reduced physical, sensory or
mental capabilities must not use this
product, unless they are under supervision
or have been instructed in the use of the
product by a person responsible for their
safety.
Children must not use or play with this
product.
Warning
If these safety instructions are not
observed, it may result in personal injury.
Warning
If these instructions are not observed, it
may lead to electric shock with consequent
risk of serious personal injury or death.
Caution
If these safety instructions are not
observed, it may result in malfunction or
damage to the equipment.
Note
Notes or instructions that make the job
easier and ensure safe operation.

English (GB)
6
2. Safety instructions
Receiving the product
Installing the product
Starting-up the product
Servicing the product
Fault finding the product
Warning
Before starting work on the product, make
sure that the fuses have been removed or
the mains switch has been switched off.
Make sure that the power supply cannot
be accidentally switched on.
Warning
These safety instructions as well as the
instructions in each individual section must
be followed when transporting, storing,
handling and operating the pump.
The pump must be installed, connected,
started up and serviced by qualified
persons.
Beware of rotating parts.
Make sure that persons cannot
accidentally fall into the tank, e.g. by
installing a cover or railing.
Warning
Make sure that the pump cannot roll or fall
over.
Warning
Before attempting to lift or otherwise
handle the individual components of the
pump, observe any local regulations that
set limits for the weight of the components
to be lifted manually by individuals, i.e.
handled without the use of lifting
equipment.
Warning
Make sure the power supply to the control
cabinet has been switched off.
Warning
Before making any electrical connections,
make sure that the fuses have been
removed or the mains switch has been
switched to off. Make sure that the power
supply cannot be accidentally switched on.
Warning
When adjusting the relay, beware of
electric voltage.
Warning
When loosening the oil level screw, note
that pressure may have built up in the
chamber.
Do not remove the screw until the pressure
has been fully relieved.
Warning
Make sure that no persons can fall into the
tank.
Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched to off.
Make sure that the power supply cannot
be accidentally switched on.
All rotating parts must have stopped
moving.
Warning
If a pump has been used for a liquid which
is injurious to health or toxic, it will be
classified as contaminated.
Warning
When loosening the oil level screw, note
that pressure may have built up in the
chamber.
Do not remove the screw until the pressure
has been fully relieved.
Warning
Before starting any work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched to off. Make sure that the power
supply cannot be accidentally switched on.
All rotating parts must have stopped
moving.

English (GB)
7
3. Receiving the product
3.1 Transporting the product
The individual components of the pump must be
packed carefully to prevent any damage to the
surface protection during transportation.
All lifting equipment must be rated for the purpose
and checked for damage before any attempts to lift
the components are made. The lifting equipment
rating must under no circumstances be exceeded.
3.2 Inspecting the product
On delivery, the pump and any accessories supplied
with it must be checked for transport damage. This
also applies when the equipment is delivered to the
installation site.
If the pump or any accessories have been damaged
during transportation, contact your local Grundfos
company before continuing to install the equipment.
Do not dismantle a damaged new component for
further inspection, unless instructed by your local
Grundfos company.
The packaging material must be disposed of
according to local regulations.
3.3 Storing the product
The pump must be stored in a dry location in which
the temperature is not subject to major fluctuations.
If the pump has been stored for more than one year,
the gearbox oil must be changed. The oil must be
changed even if the pump has never been in use.
This is necessary because of natural aging of
mineral oil lubricants.
4. Installing the product
During installation, the pump must only be lifted
when using the suspension point.
The lifting equipment supplied with the pump as well
as the wire used for lifting and lowering the pump
into the tank must not be used as universal lifting
equipment.
4.1 Positioning
Correct positioning of the pump is essential to
ensure trouble-free operation and long life. The
following guidelines must be observed:
• If more pumps are installed in the same tank,
they must not generate opposite flows.
• The distance from the centre of the pump to the
tank bottom (Hmin) must be equal to the impeller
diameter. See fig. 1.
• The distance from the top of the pump rack to the
liquid surface (HABOVE) must fulfil one of the
following two requirements:
– For pumps with vortex shield, the distance
must at least be equal to the impeller diameter.
– For pumps without vortex shield, the distance
must at least be equal to 1.5 times the impeller
diameter. See fig. 1.
Fig. 1 Distance to liquid surface and tank
bottom
Warning
Make sure that the pump cannot roll or fall
over.
Warning
Before attempting to lift or otherwise
handle the individual components of the
pump, observe any local regulations that
set limits for the weight of the components
to be lifted manually by individuals, i.e.
handled without the use of lifting
equipment.
Caution
Never hang the pump by the supply cable.
Never let the pump run while hanging in
the lifting equipment.
TM02 9478 0215
Hmin HAbove

English (GB)
8
Fig. 2 Open installation
* Guide claws are only available for SRG.xx.80.
4.2 Torques
All nuts and screws used for the installation must be
made of stainless steel.
Use grease (Alu-paste) together with a spring
washer or lock nut; otherwise, use Loctite or a
similar product for lubrication and locking.
All stainless-steel nuts and screws must be tightened
to the following torques:
4.3 Mechanical installation
See section 4.2 Torques and fig. 2.
1. Weld the connection flange to the cast-in pipe
end in the tank.
2. Weld the profile section to the connection flange
and pipe end. Place it in position 12 o'clock.
Fig. 3 Profile section on connection flange
3. SRG.xx.80.xx: Weld the guide claws to the
connection flange. See fig. 4.
Fig. 4 Position of guide claws
TM04 3962 0215
Pos. Designation
1Bottom fixation bracket and guide
claws on connection flange*
2 Column profile
5 Top fixation bracket
12 Crane foot
13 Crane with winch and lifting wire
15 Lifting wire incl. wire clamp
17 Cable clamp
18 Cable sock, incl. shackle ∅10
19 Intermediate fixation bracket
23 Connection flange
13
5
17
15
23
1
1
2
19
12
18
Screws F-Class 70
[Nm]
Screws F-Class 80
[Nm]
M6 8.8 11.8
M8 21.4 28.7
M10 44 58
M12 74 100
M16 183 245
M20 370 494
TM03 0572 0205TM03 3028 0106

English (GB)
9
4. Drill the holes for the mounting screws for the top
fixation bracket in the concrete.
5. Mount the screws and fit the top fixation bracket.
6. Depending on the length of the column profile,
weld the turnable part of an intermediate fixation
bracket to the column profile.
Fig. 5 Top fixation
7. Position and align the column profile with the
profile section on the connection flange. Shorten
the column profile (pos. 2) to the correct length to
match the position of epoxy insulator (pos. C) at
the top fixation bracket. A gap of 5 to 10 mm
between collar of epoxy and column profile is
optimal. See fig. 5.
8. Remove the epoxy insulator and the turnable
metal part by removing the centre screw (pos. A)
and the two fixation screws (pos. B).
9. Adapt the outside of the square epoxy insulator
to the inside of the column profile. The epoxy
insulator must fit tightly inside the column profile.
10. Place the column profile on the profile section on
the connection flange and mount the top end with
the epoxy insulator and the turnable metal part
on the already installed top fixation bracket.
Tighten the three screws (pos. A) and (pos. B) in
the desired position. It is possible to adjust the
angle in steps of 7.5 °.
11. Fit an intermediate fixation bracket to the
turnable part welded on to the profile tube in step
6. Drill holes in the tank wall, fit screws in the
bracket and tightening the screws.
12. Drill the holes for the mounting screws for the
crane foot in the concrete.
13. Mount the crane foot and fit and tighten the
screws.
14. Mount the lifting wire on the pump rack using the
shackle. See fig. 6.
Fig. 6 Mounting of lifting wire on the pump rack
15. Mount the top end of the safety wire to the hole
(pos. 31, fig. 5) of the top fixation bracket by
means of a shackle. The other end of the safety
wire ends in a shackle through which the lifting
wire must run.
Fig. 7 Safety wire
16. Fix the power supply cable to the lifting wire by
means of a cable clamp approx. 0.8 m above the
pump. This will prevent the cable from falling
down and becoming entangled in the impeller
during operation. Connect the cable clamp to the
lifting wire above the wire clamp by means of a
snap hook. See fig. 8. Attach the power supply
cable to the lifting wire by means of cable clamps
placed at 1 m intervals.
TM04 2719 2908
A
C
B
31
TM04 4006 0215TM04 3932 4914
15

English (GB)
10
Fig. 8 Attaching the power supply cable to the
lifting wire
17. Position the crane in the foot and mount the
lifting wire in the drum of the winch.
18. Lift the complete pump (pump rack with motor)
using the crane and slide it over the column
profile.
19. Slowly lower the pump into the tank and down to
position on the connection flange.
20. Mount the cable sock (pos. 18) to the top fixation
bracket using the shackle, and pull the motor
cable through it to the desired position. See fig.
9. The power supply cable should be slightly
tightened.
Fig. 9 Top fixation bracket with lifting and
safety wires and cable sock
21. Remove the lifting wire from the winch and fit it to
the wire clamping (pos. 20) on the top fixation
bracket.
Use the lifting wire as a relief for the power supply
cable. For this reason, the lifting wire must always be
tightened.
22. Connect the power supply cable to the terminals
in the control cabinet.
4.4 Electrical connection
The electrical connections must be carried out by a
qualified electrician in accordance with local
regulations.
All national and local regulations relating to safety
and accident prevention must be observed.
The supply voltage and frequency are marked on the
pump nameplate. Make sure that the pump is
suitable for the power supply available at the
installation site.
The pump is supplied complete with a power supply
cable of 10 m (standard length, suitable for up to 7 m
deep tanks). Standard cable lengths are 10 and 15
m, longer cables are available on request. See
section 6.2 Identification.
The motor is marked either with a Y (star) or Δ
(delta). Make this connection in an external control
panel using conductors 1 to 6 of the power supply
cable.
Figure 10 shows a schematic drawing of these star
and delta connections. See also section 4.4.2 Wiring
diagrams.
If the pump is connected in delta during operation,
the pump can be started in a star-delta connection.
Fig. 10 Schematic drawing of delta and star
connection
TM02 4938 1802
Caution
Always leave at least three turns of wire on
the drum. Otherwise the wire may break
loose from the drum fixation.
Note
Follow the separate installation and
operating instructions for cranes.
TM04 3929 2813
Caution
Remove the lifting wire from the crane
before starting the pump.
Power
supply
cable
Wire clamp
Lifting wire (15)
Snap hook
Cable
clamp (17)
20
18
31
B
Warning
Make sure the power supply to the control
cabinet has been switched off.
Warning
Before making any electrical connections,
make sure that the fuses have been
removed or the mains switch has been
switched to off. Make sure that the power
supply cannot be accidentally switched on.
TM02 4953 2002
W2
U1
U2
V1
V2
W1
L1 L2 L3
W2
U1
U2
V1
V2
W1
L1 L2 L3
Star
Delta

English (GB)
11
4.4.1 Starting method
Continuous operation
We recommend star-delta starting, soft starter or
frequency converter throughout the entire power
range.
Intermittent operation
Start via softstarter or frequency converter is
mandatory throughout the entire power range.
4.4.2 Wiring diagrams
Fig. 11 Three thermal switches (PTO)
Fig. 12 Three PTC sensors
4.4.3 Direction of rotation
When the electrical connections have been carried
out, check that the impeller is rotating in the correct
direction. When viewed from the motor, the impeller
must rotate clockwise. An arrow on the motor
housing shows the correct direction of rotation.
If the impeller rotates in the wrong direction,
interchange two phases of the mains supply (L1, L2,
L3).
TM02 4940 1802
Terminals Description
1, 2, 3, 4, 5, 6 Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
11, 12 Thermal switches (F6)
21, 22 Leak sensor in gearbox (B)
B
LSV2U2W2W1V1U1 PEPTO
TM02 4932 1802
Terminals Description
1, 2, 3, 4, 5, 6 Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
31, 32 PTC sensors (according to DIN 44
081) (1, 2, 3)
21, 22 Leak sensor in gearbox (B)
LSV2U2V1U1 W2W1 PTC PE

English (GB)
12
4.4.4 Frequency converter operation
All SRG pumps are designed for frequency converter
operation for energy saving and for soft start. For
frequency converter operation, please observe the
following information:
• Requirements must be fulfilled.
• Recommendations ought to be fulfilled.
• Consequences must be considered.
4.4.5 Requirements
• Peak voltage and dU/dt must be in accordance
with the table below. The values stated are
maximum values supplied to the motor terminals.
The cable influence has not been taken into
account. See the frequency converter data sheet
regarding the actual values and the cable
influence on the peak voltage and dU/dt.
3x400V 50 Hz:
• In case the above values are too high, a dU/dt
filter could prevent the voltage peaks.
• The thermal protection of the motor must be
connected.
• Do not exceed the frequency indicated on the
nameplate. Otherwise, there is a risk of motor
overload.
• Local regulations or standards must be fulfilled.
4.4.6 Recommendations
• Do not reduce the motor speed to less than 30 %
of the rated speed.
• Do not set any slip compensation, as it may lead
to an over speed and therefore to motor
overload.
• Set the frequency converter U/f ratio to a linear
relation, and use the data from the motor
nameplate for settings about rated current,
power, voltage and frequency.
• Use input and output filters on the frequency
converter. See data sheet for the frequency
converter used.
• Keep the power cable as short as possible. The
peak voltage will increase with the length of the
power cable. See data sheet for the frequency
converter used.
• Use a screened power cable if there is a risk that
electrical noise can disturb other electrical
equipment. See data sheet for the frequency
converter used.
• Ramp-up and ramp-down time must be at least 5-
10 seconds.
4.4.7 Consequences
When operating the product via a frequency
converter, please be aware of these possible
consequences:
• The locked-rotor torque will be lower. How much
lower will depend on the frequency converter
type. See the installation and operating
instructions for the frequency converter used for
information on the locked-rotor torque available.
• The working condition of bearings and shaft seal
may be affected. The possible effect will depend
on the application. The actual effect cannot be
predicted.
• The acoustic noise level may increase. See the
installation and operating instructions for the
frequency converter for advice as to how to
reduce the acoustic noise.
Product type
Maximum
repetitive
peak voltage
[V]
Maximum
dU/dt [V/μs]
SRG.xx.30
SRG.35.50 1500 15000
SRG.xx.xx 1000 3000

English (GB)
13
4.5 Electrical protection
4.5.1 Motor protection
The pumps are provided with the following type of
motor protection:
Standard SRG pumps incorporate three bimetallic
PTO thermal switches (PTO = Protection Thermique
á Ouverture). See fig. 11.
Function of thermal switches
The motor is protected against overheating by three
thermal switches connected in series, one switch in
each winding.
When the maximum winding temperature is reached,
the switch will open the circuit and stop the motor.
When the windings have cooled to normal
temperature, the switch will close the circuit and the
motor can be restarted. Manual restarting is
necessary.
See wiring diagram in fig. 11.
Thermal switches (F6)
• Two conductors (terminals 11 and 12).
• Maximum operating voltage of switch: 250 V.
• Maximum switching current: 2.5 A at cos φ= 1.
• Cutting-out temperature: 150 °C.
Function of PTC sensors (optional)
The motor is protected against overheating by three
thermal sensors connected in series, one in each
winding. When overheated, the motor will stop.
Automatic restarting is not permitted in such cases.
This requires a thermistor trigger unit with a
reconnection suppressor in the control circuit of the
motor contactor.
See wiring diagram in fig. 12.
1, 2, 3: PTC sensors:
• Two conductors (terminals 31 and 32).
• Maximum voltage at the terminals: Umax. = 2.5 V
(AC/DC).
• Resistance between terminals 31 and 32:
– at room temperature R = 150 to 750 Ω.
– at cutting-out temperature (130 °C) R 4000
Ω.
4.5.2 Gearbox protection
The gearbox is monitored for the ingress of water by
a leak sensor incorporated in the gearbox.
If the monitoring function is required, the leak sensor
must be connected to a Grundfos relay, type ALR-20/
A.
The ALR-20/A relay must be ordered separately.
Product number: 96489569.
For a longer distance, use an additional, screened
cable. An external alarm indicator, if any, must be
connected to the potential-free outputs, terminals 1
and 3 or 4, respectively. Maximum load: 250 V, 5 A.
When the ALR-20/A-Ex relay is connected, a current
of up to 10 mA will flow through the leak sensor
(terminals 5 and 7 in fig. 13 connected to wires 21
and 22). If water penetrates into the oil chamber, the
relay will trigger an alarm signal and/or switch off the
motor.
See wiring diagram in fig. 11 or 12.
Leak sensor
• Two conductors (terminals 21 and 22).
• Maximum operating voltage: Approx. 12 V.
• Maximum current: 1 to 10 mA.
To adjust the sensitivity of the ALR-20/A relay,
proceed as follows:
1. Turn adjusting screw (pos. a) on the relay until
indicator light (pos. b) illuminates.
2. Turn the adjusting screw in the opposite direction
until the indicator light goes out.
3. Continue to turn the adjusting screw 60 ° (same
direction as instep 2).
Note
For transmission tests at terminals 31 and
32, the test voltage must not exceed 2.5 V
(AC/DC).
Use an ohmmeter for the test.
Note
The cable between the relay and the pump
must not be longer than 50 m.
Warning
When adjusting the relay, beware of
electric voltage.

English (GB)
14
Fig. 13 Adjusting the relay
Fig. 14 ALR-20/A relay connections
4.5.3 Overload relays
The motor must be protected against overload via a
thermal delay relay according to local regulations.
The relay must be adjusted to the rated current
stated on the nameplate.
In the case of star-delta starting, the adjustable value
is to be IN x 0.58.
Incorporate electro-thermal all-pole triggers in all six
mains conductors (U1, V1, W1 and U2, V2, W2).
4.6 Protection against electro-chemical
corrosion
Two different metals or alloys cause electro-chemical
corrosion if they are connected by an electrolyte.
This applies if more than one pump is installed in the
same tank. We recommend the following additional
protection:
• galvanic separation of the earth conductor from
the neutral conductor
• galvanic separation of the mains supply by
means of an isolation transformer
• anode kit.
The earth conductor must be separated in such a
way as to ensure that no direct current can flow
through it. It must still function as a protective
conductor. This can be achieved with a limiting unit
(polarization cell or anti-parallel diode) or an isolation
transformer.
Fig. 15 Protection from electro-chemical
corrosion
TM02 8866 0904TM03 2060 3505
Note
Do not check the leak sensor with an
ohmmeter or other measuring instruments.
The leak sensor is an electronic
component.
ALR 20/A
57
Netz 230V 40-60Hz P3VA
Rel. Ue 400V le 2.5A AC15
2104 1 3
A1 A2
Netz Rel.
a
b
2104 1 3
A1 A2
arnold ag
Lecksonden Relais
Netz 230V 50-60Hz P3VA
II (2)G [EEx ib] IIC
nur für den Anschluss von Arnold AG
Lecksonden Typ AL05 Ex
Schaltpunkt Storung
ALR 20/A Ex
SEV 05 ATEX 0131
1258
57
Sonde
Rel.
Netz
CH - 6105 Schachen
A Grundfos Company
Sensor
L N
5 A 250 V
TM02 9480 2704
Pos. Designation
1 Limiting unit
2 Earth conductor
3 Isolation transformer
Caution
When using an isolation transformer, the
ratio between starting current and rated
current (IA/IN) must not be altered.
L1
L2
L3
N
PE
1
3
2
2

English (GB)
15
5. Starting-up the product
Check the oil level in the gearbox before starting up
the pump. The oil must fill up between 50 and 75 %
of the gearbox.
If required, fill oil into the gearbox through the oil
filling hole (pos. 2 in fig. 16). For oil quality and
quantity, see section 7.3 Oil.
If the pump has been in stock for a period before
startup, see section 7.2 Service chart.
Fig. 16 Oil check and oil filling
Checks before startup
1. Check that the impeller is rotating in the correct
direction. See section 4.4.3 Direction of rotation.
2. Make sure that the pump is completely
submerged in the liquid.
3. Make sure that there are no solid objects in the
tank.
6. Product introduction
Grundfos recirculation pumps, type SRG, are
designed for transfer of liquids of low to medium
viscosity from one tank to another.
Fig. 17 SRG pump
6.1 Applications
Grundfos SRG recirculation pumps are used for the
pumping of return sludge in sewage treatment plants
and for other pump applications involving a high flow
rate and low head. The pumps are designed for
continuous operation (S1).
In order not to overload the pumps and expose them
to corrosion, the following limitations must be
observed.
Warning
When loosening the oil level screw, note
that pressure may have built up in the
chamber.
Do not remove the screw until the pressure
has been fully relieved.
TM02 9479 2704
Caution
The pump must always be submerged
during operation.
Warning
Make sure that no persons can fall into the
tank.
13
2
TM03 0374 3308
Pos. Description
4Pumprack
7 Motor
8 Gearbox
10 Impeller
22 Hydraulic inlet
Liquid temperature 5-40 °C
pH value 4-10
Maximum dry solids content 1.5 %
Maximum dynamic viscosity 500 mPas
Maximum density 1060 kg/m3
Chloride content
≤200 mg/l
(stainless steel
1.4301)
22 4710
8

English (GB)
16
6.2 Identification
6.2.1 Type key
Example SRG 70. 30. 814. 25. 5. 1D. A
Type range
SRG: Submersible recirculation pump with gearbox
Motor output power, P2
Code from type designation/10 [kW]
70: 7 kW
Impeller diameter [cm]
30: 30 cm
Impeller speed [min-1]
814: 814 min-1
Impeller blade pitch [°]
25: 25 °
Explosion protection
[ ]: Non-explosion-proof
Frequency
5: 50 Hz
6: 60 Hz
Voltage and starting method
0A: 400 V, DOL
1A: 400 V, Y/D
0B: 400-415 V, DOL
1B: 400-415 V, Y/D
0V: 415 V, DOL
1V: 415 V, Y/D
0Z: Special, DOL
1Z: Special, Y/D
Generation
[ ]: First generation
A: Second generation
B: Third generation

English (GB)
17
6.2.2 Nameplate
Fig. 18 Nameplate
The nameplate is located on the motor housing. The
details on the nameplate are required for ordering of
spare parts.
Fix the additional nameplate supplied with the pump
in a visible position at the installation site.
7. Servicing the product
Before starting any work on a pump used in liquids
which could constitute a hazard to health, thorough
cleaning and venting of the pump, tank, etc. must be
carried out according to local regulations.
Damaged parts must always be replaced by new
approved parts. Do not recondition motor parts by
machining, retapping, welding, etc.
7.1 Contaminated pump
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.
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.
TM07 1505 1019
Pos. Description
1 Type designation
2 Product number
3 Liquid temperature range
4 Production site
5 Enclosure class according to IEC
6 Impeller diameter
7 Insulation class
8 Rated voltage
9 Rated speed (impeller)
10 Weight
11 Starting current
12 Frequency
13 Safety factor
14 Number of poles
15 Rated current
16 Power factor
17 Motor power P1/P2
18 Production code
19 Maximum installation depth
15 111214 13
123 45 6
18
17
16
19
8
9
10
7
Warning
Before starting work on the pump, make
sure that the fuses have been removed or
the mains switch has been switched to off.
Make sure that the power supply cannot
be accidentally switched on.
All rotating parts must have stopped
moving.
Warning
If a pump has been used for a liquid which
is injurious to health or toxic, it will be
classified as contaminated.

English (GB)
18
7.2 Service chart
Type Service instructions Lubrication Inspection
Electric
motor All
Keep the motor housing
clean (otherwise cooling is
affected).
The motor housing may
only be dismantled by
Grundfos.
The roller bearings are
maintenance-free. They
must be replaced if they get
noisy.
Power
supply
cable
All
Check the power supply
cable twice a year for
surface damage, strain,
kinks, etc.
If damaged, the cable must
be replaced by Grundfos.
Gearbox All
In case of wear, replace lip
seal and wear ring.
If the oil contains water,
replace the shaft seal.
Change the oil whenever it
contains water or is
contaminated. Change the
oil at least every two years.
If refilling is required, see
section 7.3 Oil.
If the shaft seal housing is
not monitored for the
ingress of water, we
recommend that you make
inspections every 6
months.
Impeller All
Check the impeller
regularly for wear and tear.
Remove any material
wound round the impeller,
such as ropes, threads, etc.
which may cause uneven
running and oscillation of
the installation. In case of
strong turbulence, cleaning
is absolutely necessary.
Winch All
Spray the winch with a
protective coating of oil at
regular intervals to prevent
corrosion.
The gear teeth and the
bearing bushes must be
lubricated twice a year with
an all-purpose grease.
Lifting
wire All
Regular oiling or greasing
increases the life of the
wire.
Check the wire regularly
and always before using
the winch. Replace the
wire, if required.
Screws All
Always check that all
screws in the pump rack
are properly tightened.
When tightening the
screws, renew the
threadlocker if necessary.

English (GB)
19
7.3 Oil
7.3.1 Oil quality
Gear oil designation according to DIN 51502: ISO
VG 68.
7.3.2 Oil quantity
7.4 Changing the oil
Place the pump in a horizontal position on supports
and place a pan underneath to collect the oil.
1. Remove the screw (pos. 2). See fig. 19.
2. Loosen and remove the oil drain screw (pos. 1),
and allow the oil to drain from the chamber into a
glass. Leave the oil in the glass for approx. 10
minutes and check if it contains water. If the oil
contains water, the shaft seal must be replaced.
3. Clean and refit the oil drain screw (pos. 1).
4. Fill oil into the oil chamber through the filling hole
(pos. 2). Quantity according to section 7.3.2 Oil
quantity.
5. Refit the screw (pos. 2).
Fig. 19 Position of oil drain and oil filling screws
Type Gearbox
[l]
SRG.08.30.526.
1.2
SRG.10.30.606.
SRG.13.30.678.
SRG.16.30.745
SRG.18.30.806.
SRG.30.30.517.
SRG.40.30.593.
SRG.50.30.684.
SRG.60.30.752.
SRG.70.30.814.
SRG.35.50.257.
SRG.50.50.291.
2.5
SRG.65.50.343.
SRG.80.50.378.
SRG.100.50.412.
SRG.70.80.263.
SRG.100.80.303.
SRG.120.80.323. 4.0
SRG.130.80.340. 2.5
SRG.130.80.375.
SRG.160.80.355.
4.0SRG.200.80.388.
SRG.240.80.417.
Warning
When loosening the oil level screw, note
that pressure may have built up in the
chamber. Do not remove the screw until
the pressure has been fully relieved.
Note
Used oil must be disposed of in
accordance with local regulations.
TM02 9479 2704
13
2

English (GB)
20
8. Fault finding the product
Warning
Before starting any work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched to off. Make sure that the power
supply cannot be accidentally switched on.
All rotating parts must have stopped
moving.
Fault Cause Remedy
1. The pump does
not start.
a) No power supply or supply failure. Call an electrician.
b) Power supply cable is faulty. Call an electrician.
c) Control system is faulty. Call an electrician.
d) Impeller cannot rotate freely. Clean the impeller and check manually
that it can rotate freely.
e) Stator windings are faulty. Contact Grundfos.
f) Motor has cut out because of
overheating.
Wait until the motor has cooled and
attempt to restart the pump.
g) Different phase voltages. Call an electrician.
h) Overload relay is set too low or is
faulty.
Check the overload relay. Set the relay to
the rated current. See section
4.5.3 Overload relays.
i) Leak sensor has cut out the pump. Contact Grundfos.
j) Humidity in motor. Contact Grundfos.
2. Pump starts, but
stops immediately.
a) Stator windings are faulty. Contact Grundfos.
b) Different phase voltages. Call an electrician.
c) Overload relay is set too low or is
faulty.
Check the overload relay. Set the relay to
the rated current. See section
4.5.3 Overload relays.
d) Leak sensor has cut out the pump. Contact Grundfos.
e) Humidity in motor. Contact Grundfos.
3. No liquid or
inadequate
quantity is pumped
even if the motor is
running.
a) Impeller rotates in the wrong
direction.
Interchange two phases of the mains
supply.
b) Pump runs on two phases. 1. Check the electrical connections.
2. Replace faulty fuses.
3. Call an electrician.
c) Internal parts are worn. Contact Grundfos.
d) Impeller dirty or damaged. Clean the impeller and inspect for any
wear.
4. Pump runs
unevenly and
makes noise.
a) Internal parts are worn. Contact Grundfos.
b) Impeller dirty or damaged. Clean the impeller and inspect for any
wear.
c) Faulty motor or gearbox roller
bearings.
Contact Grundfos.
d) Oscillations caused by the
installation (resonance).
Check installation design.