Grundfos DPK Series User manual

DPK, DPK.V
Installation and operating instructions
QR97515234
Installation and operating instructions
(all available languages)
http://net.grundfos.com/qr/i/97515234
GRUNDFOS INSTRUCTIONS

DPK, DPK.V
English (GB)
Installation and operating instructions ..................................5
Čeština (CZ)
Montážní a provozní návod ........................................24
Deutsch (DE)
Montage- und Betriebsanleitung .....................................44
Dansk (DK)
Monterings- og driftsinstruktion ......................................66
Español (ES)
Instrucciones de instalación y funcionamiento............................85
Français (FR)
Notice d'installation et de fonctionnement..............................105
Hrvatski (HR)
Montažne i pogonske upute .......................................125
Magyar (HU)
Telepítési és üzemeltetési utasítás ..................................144
Italiano (IT)
Istruzioni di installazione e funzionamento .............................164
Lietuviškai (LT)
Įrengimo ir naudojimo instrukcija ....................................184
Polski (PL)
Instrukcja montażu i eksploatacji....................................203
Português (PT)
Instruções de instalação e funcionamento .............................223
Română (RO)
Instrucţiuni de instalare şi utilizare...................................243
Srpski (RS)
Uputstvo za instalaciju i rad .......................................263
Slovensko (SI)
Navodila za montažo in obratovanje .................................282
Slovenčina (SK)
Návod na montáž a prevádzku .....................................301
Türkçe (TR)
Montaj ve kullanım kılavuzu .......................................320
3
Table of contents

中文 (CN)
安装和使用说明书 ..............................................339
한국어 (KO)
설치 및 작동 지침 ..............................................357
Bahasa Indonesia (ID)
Petunjuk pengoperasian dan pemasangan.............................376
(AR) ةيبرعلا
    .............................................395
Appendix A..................................................413
4DPK, DPK.V
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 6
1.1 Hazard statements .............. 6
1.2 Notes ..................... 6
1.3 Target group.................. 6
2. Product introduction ............ 7
2.1 Product description .............. 7
2.2 Intended use ................. 7
2.3 Pumped liquids ................ 7
2.4 Identification.................. 7
3. Receiving the product............ 9
3.1 Transporting the product ........... 9
3.2 Handling and lifting the product ....... 9
4. Mechanical installation ...........10
4.1 Installation requirements ...........10
4.2 Installation on auto coupling .........11
4.3 Installation on ring stand ...........11
5. Electrical connection ............12
5.1 Wiring diagram ................13
5.2 Frequency converter operation ........14
5.3 Thermal protection ..............14
5.4 Pump controllers ...............15
6. Preparations before startup ........16
6.1 Startup.....................17
6.2 Operating modes ...............17
6.3 Checking the direction of rotation ......18
7. Maintenance and service ..........19
7.1 Maintenance schedule ............19
7.2 Oil check and change.............20
7.3 Contaminated pumps .............20
8. Storing the product .............21
9. Fault finding .................21
9.1 The motor does not start, the fuses blow
or the motor protector trips out
immediately ..................21
9.2 The pump operates but the motor
protector trips after a short while .......22
9.3 The thermal switch of the pump trips after
a short while..................22
9.4 The pump operates at below-standard
performance and power consumption ....22
9.5 The pump operates, but gives no liquid . ..22
9.6 The pump is clogged .............22
10. Technical data ................22
10.1 Operating conditions .............22
11. Disposing of the product ..........23
12. Document quality feedback ........23
5
English (GB)

1. General information
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
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.
The hazard statements are structured in the following
way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
Observe these instructions for explosion-
proof products.
A blue or grey circle with a white graphical
symbol indicates that an action must be
taken.
A red or grey circle with a diagonal bar,
possibly with a black graphical symbol,
indicates that an action must not be taken
or must be stopped.
If these instructions are not observed, it
may result in malfunction or damage to the
equipment.
Tips and advice that make the work easier.
1.3 Target group
These installation and operating instructions are
intended for professional installers.
6
English (GB)

2. Product introduction
2.1 Product description
DPK pumps are designed with semi-open or
SuperVortex, free-flow impeller for use in a wide
range of applications in industrial and construction
sites.
All pumps are supplied with a 10 m cable and a free
cable end.
1
2
3
4
6
5
7
9
8
TM076891
DPK pump
1
5
2
3
4
6
7
9
TM076892
DPK.V pump
Pos. Description
1 Lifting bracket
2 Nameplate
3 Motor
4 Outlet flange
Pos. Description
5 Cable inlet
6 Cable
7 Top cover
8 Ring stand
9 Pump housing
2.2 Intended use
Pumps are designed for pumping surface-, drainage-
and underground water in a wide range of
commercial and industrial applications.
2.3 Pumped liquids
DPK pumps are ideal for transferring the following
liquids:
• drainage water
• surface water
• underground water.
DPK.V pumps are ideal for transferring the following
liquids:
• effluent
• screened sewage.
2.4 Identification
2.4.1 Nameplate
Fix the extra nameplate supplied with the product at
the installation site or production location, so the data
can be checked when necessary. Make sure that the
nameplate is visible.
The nameplate is fitted to the top cover of the pump.
IP68
Type:
Model:
Hmax:
Motor:
n:
Weight:
Qmax:
Insul.class:
P1/P2:
Y
Tmax.:
CosΦ :
P.c.:
2
3
6
10
13
1
5
9
12
15
18
32
16 11 14 17
7 4 8
99657184
U.K Importer:
Grundfos Pumps ltd.
Grovebury Road
Leighton Buzzard
Bedfordshire LU74TL
TM044365
Nameplate on product
7
English (GB)

1
2
32
3
10
22
13
14
17
11
16
8
7
6
4
5
12
9
15
18
20
21
TM1040583
Nameplate in packaging
1
2
32
3
10
22
13
14
17
11
24 25
7
6
4
5
12
9
15
18
20
21
23
16
TM1040582
Nameplate for products in China
Pos. Description
1 Type designation
2 Material No. + Serial No.
3 Maximum head [m]
4 Maximum flow [l/s]
5 Maximum liquid temperature [°C]
6 Maximum installation depth [m]
7 Enclosure class
8 Insulation class/temperature class
9 Power factor
10 Number of phases
11 Frequency [Hz]
12 Motor input and output power P1/P2 [kW]
13 Speed [rpm]
14 Rated voltage [V] (delta connection)
Pos. Description
15 Rated current [A] (delta connection)
16 Weight [kg]
17 Rated voltage [V] (star connection)
18 Rated current [A] (star connection)
20 Duty point Q [m3/h]
21 Duty point H [m]
22 Size of flange
23 Temperature rise [K]
24 Product type
25 Company standard
32 Production code (year and week)
2.4.2 Type key
The pump can be identified by the type designation
stated on the nameplate.
Example: DPK.15.80.22.5.0D
Code Description Designation
DPK Drainage pump Pump type
[ ] Single-channel, semi-open
impeller Impeller type
V SuperVortex impeller
15 Maximum solids size [mm] Free passage
80 Nominal outlet diameter Pump outlet
22 Output power P2 22 = 2.2
kW 1) Power [kW]
[ ] Standard Equipment
2 2-pole Number of poles
4 4-pole
5 50 Hz Frequency [Hz]
6 60 Hz
0D 380-415 V, DOL
Voltage and
starting method
1D 380-415 V, Y/D
0E 220-240 V, DOL
1E 220-240 V, Y/D
Z Custom-built variant Customisation
1) Exception: Code 075 = 0.75 kW.
8
English (GB)

3. Receiving the product
The product is supplied in proper packing in which it
must remain until it is to be installed.
Make sure that the product cannot roll or
fall over.
If the product is not installed immediately, the free end
of the power cable or the sensor cables must be
protected from moisture, which could otherwise
penetrate into the motor windings. This must be done
as soon as the product is received.
Protect the cables by fitting a cable cap or by
wrapping the free end of the cable in plastic and
securing the plastic with strong waterproof tape.
3.1 Transporting the product
While in factory packaging, transport the pumps in
vertical position only. Pumps without factory
packaging can be transported either horizontally or
vertically
Make sure that the product cannot roll or
fall over.
Make sure that the received product corresponds to
the order. In case of damage or missing parts,
inform the transport company or the
manufacturer immediately.
3.2 Handling and lifting the product
Use approved lifting equipment only.
The weight of the specific product is stated on the
nameplate.
WARNING
Crushing hazard
Death or serious personal injury
‐Do not work near or under suspended
loads.
‐The area below the lifted pump must
be clear of people and marked off.
WARNING
Crushing hazard
Death or serious personal injury
‐All lifting equipment must be rated for
the purpose and checked for damage
before lifting the product. The lifting
equipment rating must not be
exceeded.
CAUTION
Crushing hazard
Minor or moderate personal injury
‐Make sure that the pump cannot swing
during lifting.
‐Place the pump on a solid foundation.
‐Make sure that the pump cannot roll or
fall over.
WARNING
Crushing hazard
Minor or moderate personal injury
‐Before lifting the package, check the
centre of gravity marked on the box.
‐Always check the lifting bracket and
chain for corrosion or wear before
lifting.
‐Always lift the pump by its lifting
bracket or by a forklift truck.
‐Never lift the pump by the power cable,
hose or pipe.
‐Do not stack pump packages.
CAUTION
Crushing hazard
Minor or moderate personal injury
‐Make sure that the lifting bracket is
tightened before lifting the pump.
9
English (GB)

4. Mechanical installation
Before installation, check the oil level in the oil
chamber.
The pumps are suitable for auto-coupling and free-
standing installations. All pump housings can be
connected to a JIS flange, hose coupling or auto
coupling.
DANGER
Electric shock
Death or serious personal injury
‐Before installation, switch off the power
supply and lock the main switch in
position 0.
‐Before working on the pump, switch off
any external voltage connection.
DANGER
Electric shock
Death or serious personal injury
‐Before installation and the first startup
of the pump, check the power cable for
visible defects and measure the cable
resistance to avoid short circuits.
DANGER
Electric shock
Death or serious personal injury
‐Make sure that the earthing is
connected first.
The pumps are designed for operation in
vertical position only.
4.1 Installation requirements
Before installation, check that the pump is suitable for
the supply voltage and frequency available at the
installation site.
Pump installation in pits must be carried
out by trained persons.
Make sure that there is enough fresh air in
the pit.
All work in pits must be supervised by a
person outside the pump pit.
CAUTION
Biological hazard
Minor or moderate personal injury
‐Pits for sewage and wastewater may
contain toxic or contagious
substances. Always wear appropriate
personal protective equipment and
clothing before entering the pit.
DANGER
Electric shock
Death or serious personal injury
‐Before installation, switch off the power
supply and lock the mains switch in
position 0.
DANGER
Electric shock
Death or serious personal injury
‐It must be possible to lock the main
switch in position 0. Type and
requirements are specified in EN
60204-1.
WARNING
Hot surface
Minor or moderate personal injury
‐Do not touch the pump or cables
during operation as the surface
temperature may exceed 70 °C.
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear protective gloves when working
on the pump.
Maintenance and service work must be
carried out when the pump is outside the
pit. For safety reasons, all work inside pits
must be supervised by a person outside
the pit.
Observe all safety regulations at the
installation site.
These installation and operating
instructions cover the standard installation
types. For customised installation, contact
Grundfos.
WARNING
Crushing hazard
Death or serious personal injury
‐Make sure that the lifting bracket is
tightened before lifting the pump.
10
English (GB)

4.2 Installation on auto coupling
Pumps for permanent vertical installation in a pit can
be mounted on a stationary auto-coupling unit. The
auto-coupling system facilitates maintenance and
service as the pump can easily be lifted out of the
tank.
TM076887
Installation on auto coupling
Proceed as follows:
1. Fit the guide-rail bracket on the inside of the pit
and fasten it with anchor bolts.
2. Place the auto-coupling base unit on the bottom
of the pit.
3. Fasten it with heavy-duty expansion bolts.
Support the auto-coupling base unit to be leveled.
4. Connect the outlet line without exposing it to
distortion or tension.
5. Insert the guide rails in the auto-coupling base
unit and adjust the length of the rails accurately.
6. Unscrew the provisionally fastened guide-rail
bracket and fit it on the top of the guide rails.
Fasten the bracket to the pit wall.
7. Clean out debris from the pit before lowering the
pump into it.
8. Fit the guide claw to the outlet port of the pump.
Slide it down the guide rails and lower the pump
into the pit by a chain fastened to the lifting
bracket. When the pump reaches the auto-
coupling base unit, it automatically connects.
9. Hang up the end of the chain on a suitable hook
at the top of the pit, so the chain cannot come into
contact with the pump housing.
10. Adjust the length of the power cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief fitting
to a suitable hook at the top of the pit.
11. Connect the power cable.
The guide rails must not have any axial
play as this may cause noise during pump
operation.
Make sure that the cable is not sharply
bent or pinched.
4.3 Installation on ring stand
Pumps for free-standing submerged installation can
stand freely on the bottom of the pit. The pump must
be installed on a ring stand.
TM076888
Fit a flexible union or coupling to the outlet for service
and easy separation of the pump.
If a hose is used, make sure that it does not buckle
and the inside diameter of the hose matches the
pump outlet.
If a rigid pipe is used, fit the union or coupling, non-
return- and isolating valves in this order starting from
the pump.
If the pump is installed in muddy conditions or on
uneven ground, place it on a solid support.
Proceed as follows:
1. Fit a 90° elbow to the pump outlet port and
connect the outlet pipe or hose.
2. Lower the pump into the liquid by a chain secured
to the lifting bracket. Place the pump on a plain,
solid foundation to make sure that it stands
securely.
11
English (GB)

3. Hang up the end of the chain on a suitable hook
at the top of the pit, so the chain cannot come into
contact with the pump housing.
4. Adjust the length of the power cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation.
5. Fasten the relief fitting to a suitable hook.
6. Connect the motor power cable.
Make sure that the cable is not sharply
bent or pinched.
5. Electrical connection
WARNING
Electric shock
Death or serious personal injury
‐Before working on the pump, make
sure that the main switch is switched
off and locked in position 0. Make sure
that the power supply cannot be
switched on unintentionally.
WARNING
Electric shock
Death or serious personal injury
‐During frequency converter operation,
residual voltage may be present in the
motor terminal. Wait for the residual
voltage to discharge or add a
maintenance switch suitable for
isolation between frequency converter
and motor.
WARNING
Electric shock
Death or serious personal injury
‐Install a motor protector. Set it to the
rated current +10 %.
‐Make sure that all protective
equipment is connected correctly.
WARNING
Electric shock
Death or serious personal injury
‐Cable extension is not permitted.
Contact Grundfos for the right cable
length.
WARNING
Electric shock
Death or serious personal injury
‐The motor-protective circuit breaker of
the pump controller must include a
circuit which automatically disconnects
the power supply in case the protective
circuit of the pump is opened.
Make sure that the electrical connection
complies with local regulations.
Do not install Grundfos control boxes and
pump controllers in potentially explosive
environments.
Connect the pump to a control box with a
motor-protective relay with IEC trip class
10 or 15.
The pump must be connected to a main
switch with a minimum 3 mm contact gap
in all poles.
Check the signal wires (marked with "TP"
for thermal protection) of the power cable
with a multimeter. The circuit must be
closed and resistence must be below 1
Ohm.
Related information
5.1 Wiring diagram
12
English (GB)

5.1 Wiring diagram
IP
CP
CP
P
N1
AM
O
O
I
SR/S OL RU S F
Y R G
RES
N2
L1 L2 L3
MCCB
V
A
MCCB
OP . TR
MC
THR
U1 V1 W1
E
1 .M
3 ~
T / P T / P S / S S / S
GU 01 / GU 02
S / S
F / L
MC
MC
AUX
THR
OL RL GL AUX
THR
MC
6
5
GU01/GU02
6
8
AUX
F / L
E1
E2
E3
GU01/ GU02
1
11
2
3
9
10
T / P
T / P
S / S
S / S
TM081069
Direct-on-line starting
L1 L2 L3
MCCB
V
AMCCB
MC Md My
THR GU 01 / GU 02
E
U1 V1 W1 W2 U2 V2
1.M
3 ~
T/ P T/ P S/ S S/ S
S/ S
F/ L
MC
T
T My Md MC
AUX
THR THR
MC
OL RL GL AUX
6
5
GU01/GU02
6
8
AUX
F/ L
E1
E2
E3
GU01/
GU02
10
9
3
2
1T/ P
S/ S
T/ P
S/ S
11
IP
CP
CP
P
N1
AM
O
O
I
SR/S OL RU S F
N2
RES
OP . TR
YRG
TM081070
Star-delta starting
13
English (GB)

Pos. Description
IP Input power
CP Control panel
P Pump
N1 1. T/P: thermal switch
2. S/S: seal sensor
A Auto
M Manual
O Off
I On
SR/S Start-stop
OL Overload
RU Run
S Stop
F Fault
Y Yellow
R Red
G Green
RES Reset
N2 F/L: level controller
5.2 Frequency converter operation
Frequency converter is available only for
DPK 19kW and 22kW versions. Other
DPK pumps cannot be operated with
frequency converter.
In principle, all three-phase motors can be connected
to a frequency converter. However, frequency
converter operation often exposes the motor
insulation system to a heavier load and causes the
motor to be more noisy. In addition, large motors
driven with a frequency converter are loaded by
bearing currents.
For frequency converter operation, observe the
following:
• The thermal protection of the motor must be
connected.
• Peak voltage and dU/dt must be according to the
table below. The values stated are maximum
values supplied to the motor terminals. The cable
influence is not taken into account. See the
frequency converter data sheet regarding the
actual values and the cable influence on the peak
voltage and dU/dt.
• Use a screened power cable if there is a risk that
electrical noise may disturb other electrical
equipment.
• Set the frequency converter U/f ratio according to
the motor data.
• The locked-rotor torque can be lower depending
on the type of the frequency converter.
• The noise level may increase. See the installation
and operating instructions of the chosen
frequency converter.
• Minimum switching frequency is 2 kHz. Variable
switching frequency is accepted.
• Do not exceed the frequency indicated on the
nameplate as this may cause motor overload.
• Keep the power cable as short as possible. The
peak voltage increases with the length of the
power cable.
• Use input and output filters on the frequency
converter.
• Do not reduce the motor speed to less than 30%
of the rated speed.
• Keep the flow velocity above 1m/sec.
• Let the pump run at rated speed at least once a
day to prevent sedimentation in the pipe system.
Maximum repetitive peak
voltage
[V]
Maximum dU/dt UN 400 V
[V/μ sec.]
850 2000
Frequency converter use may reduce life
span of the bearings and the shaft seal,
depending on the operating mode and
other circumstances.
5.3 Thermal protection
One thermal switch is built into the motor winding and
breaks the circuit in case of overheating.
In case of intermittent operation with the water level
up to half of the motor, the thermal switch inside the
motor winding might be activated and cause the
pump to stop.
DPK 19 and 22 kW
• Thermal switch: as standard, a Klixon thermal
switch is installed, opening at a temperature of
130 °C.
Connect the thermal switch according to the wiring
diagram. Make sure that the alarm output causes a
motor stop in case of high temperature in the motor.
The thermal switch must be connected to the control
wire of the power cable inside the pump and to the
safety circuit of the separate pump controller.
5.3.1 Inspections after electrical connection
Use a multimeter to check the two signal wires of the
power cable. The circuit must be closed and the
resistance must be less than 1 Ohm.
14
English (GB)

5.4 Pump controllers
5.4.1 Level controllers
The liquid level can be controlled by the Grundfos LC
level controllers.
Suitable level controllers, depending on the size of
pumps:
• LC 231: a compact solution with certified motor
protection for a nominal current of up to 12A (9.6A
in the US) when running a single pump, or up to
9A (7.6A in the US) when running two pumps
simultaneously. Supports the DOL starting
method.
LC 231 supports analog level transmitters, digital
float switches and combinations of both. Air bells
are available as an accessory.
• LC 241: a cabinet solution offering modularity and
customisation for single- and dual-pump
versions. Supports DOL, star-delta and soft starter
starting methods. Standard variant ranges are
available for up to 23A in DOL, 43A in star-delta,
and up to 72A with soft starter. Customable
variants are available on request.
LC 241 supports analog level transmitters, digital
float switches and combinations of both.
Electrodes are available as an option and air bells
as an accessory.
"Level switches" can be air bells, float switches or
electrodes depending on the selected pump
controller.
Depending on the security levels and the number of
pumps, level switches can be used in the following
setups:
• dry run (optional)
• stop
• start pump 1 (single-pump version)
• start pump 2 (dual-pump version)
• high level (optional).
Analogue level transmitters can be used, and all
levels can be customised. Level switches can be
used with level transmitters, for dry-run protection and
high level alarm.
The pump must not run dry. Install an
additional level switch to ensure that the
pump is stopped in case the stop level
switch is not operating.
Both controllers can be fitted with a single level
transmitter, and can be supported with one or two
digital float switches for high level and dry-run setup
for security. The controllers can also be equipped
with up to 5 pieces of digital float switches only in a
two-pump installation.
If a simple installation is required, a one-pump
installation can be controlled by just one digital float
switch acting as "start pump 1 / stop” where the one
float switch starts and stops the pump. A stop delay
can be added to avoid too many starts and stops.
Similarly a two-pump installation can be created with
two digital float switches.
S1
S3
S1
S3
SR
S
FS
LT
TM081329
Pump operating levels, analog level transmitter and high-level float switch or digital float switches
15
English (GB)

Pos. Description
S1 S1 operation
S3 S3 operation
FS High-level float switch
LT Level transmitter
SR Start
S Stop
For more information about level controllers, see the
installation and operating instructions of the selected
level controller.
5.4.2 GU01 and GU02
GU01 is a device that monitors the stator temperature
and water penetration into the motor. It receives a
digital signal.
GU02 is a device that monitors the stator and bearing
temperature as well as water penetration into the
motor. It receives an analog signal.
Both monitoring devices must be connected to the
control panel through a relay.
GU01 and GU02 are manufactured for Grundfos. For
further information, contact Grundfos.
LC 231 and LC 241 controllers can handle the same
sensors as GU01 and GU02 but cannot give an
alarm.
For further information, see the data sheets for GU01
and GU02 at www.grundfos.com.
WARNING
Electric shock
Death or serious personal injury
‐Both monitoring devices must be
connected to the control panel through
a relay.
6. Preparations before startup
Before starting the product:
• Make sure that the product is not connected to the
power supply.
• Make sure that the impeller can rotate freely by
turning it by hand.
Wear protective gloves when touching
the impeller.
• Check the condition of the oil.
• Check the direction of rotation.
• Make sure that the monitoring units, if used, are
operating.
• Check the setting of the level- and float switches
or electrodes.
WARNING
Electric shock
Death or serious personal injury
‐Before working on the pump, make
sure that the main switch is switched
off and locked in position 0. Make sure
that the power supply cannot be
switched on unintentionally.
Related information
6.3 Checking the direction of rotation
7.2 Oil check and change
16
English (GB)

6.1 Startup
The pump must not run dry.
In case of abnormal noise or vibration,
stop the pump immediately. Do not restart
the pump until the cause of the fault is
identified and eliminated.
If star-delta starting is used, keep the
switching transient time to a minimum to
avoid high transient torques.
DANGER
Rotating elements
Death or serious personal injury
‐Before manual startup or changeover
to automatic control, make sure that no
persons are working on or near the
pump.
To start the pump, proceed as follows:
1. Switch on the power supply.
2. Open the isolating valves, if fitted.
3. Make sure that the pump is at least 2/3rd
submerged into the pumped liquid.
4. Tilt the pump by the lifting chain to vent it and
relieve any trapped air.
5. Run the pump briefly and check the liquid level. A
correctly vented pump lowers the liquid level
quickly.
6. Start the pump.
Use hearing protection when working nearby an
installation in operation with a sound pressure level
above 70 dB(A).
6.2 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
CAUTION
Hot surface
Minor or moderate personal injury
‐The pump must be at least 2/3rd
submerged into the pumped liquid at
all times.
S1
S3
S1
S3
SR
S
FS
LT
TM081329
Pump operating levels, analog level transmitter and high-level float switch or digital float switches
Pos. Description
S1 S1 operation
S3 S3 operation
FS High-level float switch
LT Level transmitter
SR Start
S Stop
S3, intermittent operation
S3 operation is a series of 10-minute duty cycles
(TC): the pump must run for maximum 4 minutes and
stop for minimum 6 minutes. Thermal equilibrium is
not reached during the cycle. In this operating mode,
the pump is partly submerged in the surrounding
liquid. The pump must be at least 2/3rd submerged
into the pumped liquid.
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English (GB)

P
t
1
23
TM076800
S3 operation
Pos. Description
1 Operation
2 Stop
3 Duty cycle
S1, continuous operation
In this operating mode, the pump can operate
continuously without being stopped for cooling. When
the pump is completely submerged, it is sufficiently
cooled by the surrounding liquid.
P
1
t
2
TM076798
S1 operation
Pos. Description
1 Operation
2 Stop
Related information
10.1 Operating conditions
6.3 Checking the direction of rotation
Check the direction of rotation every time the pump is
connected to a new installation.
1. Remove the pump from the system.
2. Let the pump hang from a lifting device such as
the chain used for lowering the pump into the pit.
3. Start and stop the pump while observing the
movement (jerk) of the pump.
4. If connected correctly, the pump jerks
counterclockwise.
5. If the direction of rotation is wrong, interchange
two phases in the power cable.
TM076890
DANGER
Crushing of hands
Death or serious personal injury
‐Do not touch the pump when starting it
up.
Without being submerged in the pumped
liquid, start the pump and let it run for
maximum 5 seconds to check the direction
of rotation.
Before startup, make sure that the bottom
of the pit is clean to avoid material or
objects being sucked into the impeller.
Related information
6. Preparations before startup
9. Fault finding
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English (GB)

7. Maintenance and service
7.1 Maintenance schedule
Under normal operating conditions, remove the pump
from the pit and inspect it once a year.
Under severe operating conditions including when the
liquid contains sand, fibrous matter and solids,
inspect the pump once a month.
DANGER
Electric shock
Death or serious personal injury
‐Before working on the pump, make
sure the main switch is switched off
and locked in position 0. Make sure
that the power supply is switched off
and it cannot be switched on
unintentionally.
Measure insulation resistance once a
month.
Measure outlet pressure and flow rate
once a month if a flowmeter is available.
Ball bearings require no maintenance and
are lubricated for life.
Check the current and voltage
Check the pump current and voltage. If the value
measured by the ammeter exceeds or is lower than
the rated value, it indicates a problem. The voltage
must be stable (within ± 5 %) throughout the
operational period.
Check the insulation resistance
If the insulation resistance has significantly declined
since the previous reading, it may indicate an
impending insulation failure. The pump must be
scheduled for service even if the insulation resistance
is still over 10 MΩ.
Check the outlet pressure and flow rate
Declining performance may indicate the need for an
overhaul. Regardless of performance, the pressure
and flow rate must be stable. Rapidly changing
pressure or flow rate indicate system problems on the
inlet or outlet side.
Check impeller clearence
For DPK pumps, check the clearance between the
impeller and the wear plate. The recommended
clearance is 0.3 - 0.5 mm. Replace or repair it as
necessary.
For DPK.V pumps, impeller clearance check is not
needed.
Inspect the seal sensor
Check the resistance of the seal sensor with a
multimeter.
20 KΩ
TPTP
SS SS
TM044119
Resistance check
Do not use a megger as it damages the
control circuit of the seal sensor.
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English (GB)

7.2 Oil check and change
1
TM076894
Pos. Description
1 Oil filling hole
When the pump is new or the shaft seal is replaced,
check the oil level and water content after one week
of operation. If there is more than 20 % extra liquid
(water) in the oil chamber, the shaft seal is defective.
Use original parts only.
Use ISO VG 32 Mobil DTE 24 turbine oil
90 or an equivalent type.
Dispose of used according to local
regulations.
CAUTION
Pressurised system
Minor or moderate personal injury
‐The oil chamber may be under
pressure. Loosen the screws carefully
and do not remove them until the
pressure is completely relieved.
After 3000 operating hours or at least once
a year, change the oil in the oil chamber as
described below. If the shaft seal is
replaced, the oil must be changed.
Related information
6. Preparations before startup
7.2.1 Oil draining
1. Loosen the oil plug.
2. Remove the oil plug and check the oil level.
3. Place a clean container under the pump to collect
the drained oil.
4. Tilt the pump with the oil-filling hole pointing
downwards to drain the oil.
5. Inspect the oil.
If the colour is greyish white, the oil may contain
water. If the oil contains water, the shaft seal is
defective and must be replaced. If the oil quantity
is less than the specified, the shaft seal is
defective and must be replaced. If the shaft seal is
not replaced, it can cause motor damage.
7.2.2 Oil filling
Fill the oil chamber with new oil through the oil filling
hole.
7.3 Contaminated pumps
The product is classified as contaminated, if it is used
for contagious or toxic liquid.
WARNING
Biological hazard
Death or serious personal injury
‐Flush the pump thoroughly with clean
water, and rinse the pump parts after
dismantling.
Before returning the product for service, contact
Grundfos with details about the pumped liquid.
Otherwise, Grundfos can deny to service the product.
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English (GB)