Grundfos DPK Series User manual

DPK, DPK.V
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Installation and operating instructions
DPK
http://net.grundfos.com/qr/i/97515234

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe Grundfos DPK pumps, 0.75 - 22 kW.
Sections 1-5 give the information necessary to be
able to unpack, install and start up the product in a
safe way.
Sections 6-11 give important information about the
product, as well as information on service, fault
finding and disposal of the product.
CONTENTS
Page
1. General information
1.1 Target group
These installation and operating instructions are
intended for professional installers.
1.2 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
The hazard statements are structured in the
following way:
1. General information 2
1.1 Target group 2
1.2 Hazard statements 2
1.3 Notes 3
2. Receiving the product 3
2.1 Inspecting the product 3
3. Installing the product 3
3.1 Mechanical installation 4
3.2 Electrical connection 6
3.3 Thermal protection 6
3.4 Frequency converter operation 8
4. Starting up the product 8
4.1 Operating modes 8
4.2 Checking the direction of rotation 9
4.3 Preparing for startup 10
4.4 Startup 10
5. Handling and storing the product 10
5.1 Handling the product 10
5.2 Storing the product 10
6. Product introduction 11
6.1 Product description 11
6.2 Applications and intended use 11
6.3 Improper operating methods 11
6.4 Approvals 11
6.5 Identification 12
7. Protection and control functions 13
7.1 Pump controllers 13
7.2 Level controllers 13
7.3 GU01 and GU02 13
8. Servicing the product 14
8.1 Safety instructions and requirements 14
8.2 Service documentation 14
8.3 Contaminated products 14
8.4 Maintenance 14
9. Fault finding the product 16
10. Technical data 17
10.1 Operating conditions 17
10.2 Dimensions and weights 17
11. Disposing of the product 17
Read this document before installing the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
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.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.

English (GB)
3
1.3 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
2. Receiving the product
The product is supplied from the factory in a 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 going to be installed immediately,
the free end of the power cable or the sensor cables
must be protected from moisture which could
otherwise penetrate the motor windings. This must
be done as soon as the product is received.
Protection can be carried out by fitting a cable cap or
by wrapping the free end of the cable in plastic and
taping over the plastic with strong waterproof tape.
2.1 Inspecting the product
After receiving and before installing the product,
check the following points:
• Check that the pump corresponds to the order.
• Check that accessories and other equipment are
not damaged during transport.
3. Installing the product
Before beginning the installation, check that the
pump is suitable for the supply voltage and
frequency available at the installation site.
For safety reasons, all work in pits must be
supervised by a person outside the pump pit.
Pits for submersible sewage and wastewater
products contain sewage and wastewater with toxic
and/or disease-causing substances. Therefore, all
persons involved must wear appropriate personal
protective equipment and clothing and all work on
and near the product must be carried out under strict
observance of the hygiene regulation in force.
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.
DANGER
Electric shock
Death or serious personal injury
- Before beginning the 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 to the
pump.
CAUTION
Sharp element
Minor or moderate personal injury
- Wear protective clothing (gloves) when
working on the pump.
Observe all safety regulations at the
installation site, for instance the use of
blowers for fresh-air supply to the pit.
Product installation in pits must be carried
out by specially trained persons.
Work in or near pits must be carried out
according to local regulations.

English (GB)
4
3.1 Mechanical installation
Before installation, check the oil level in the oil
chamber. See section 8.4.5 Oil check and oil
change.
The pumps are suitable for auto-coupling and free-
standing installation. All pump housings can be
connected to a JIS flange, hose coupling and auto-
coupling.
3.1.1 Lifting the product
It is very important to use the approved lifting
equipment.
The weight of the specific product is stated on the
nameplate.
3.1.2 Submerged installation on auto-coupling
Pumps for permanent installation can be mounted on
a stationary auto-coupling guide rail system. The
auto-coupling system facilitates maintenance and
service as the pump can easily be lifted out of the
tank. See fig. 1.
Fig. 1 Submerged pump on auto-coupling
DANGER
Electric shock
Death or serious personal injury
- Before installation and the first startup
of the product, check the power cable
for visible defects and measure the
cable resistance to avoid short circuits.
The pumps are designed for operation in
vertical position only.
WARNING
Crushing hazard
Death or serious personal injury
- All lifting equipment must be rated for
the purpose and checked for damage
before any attempts are made to lift the
product. The lifting equipment rating
must under no circumstances be
exceeded.
CAUTION
Crushing hazard
Minor or moderate personal injury
- The area below the lifted pump must be
clear of people and marked off.
- Lift the pump in a way that the pump will
not start swing.
- Place the pump on a solid foundation
which is suitable to hold the weight.
- Make sure that the pump cannot roll or
fall over.
CAUTION
Crushing hazard
Minor or moderate personal injury
- Always check the lifting bracket and
chain for corrosion or wear before
lifting.
- Always lift the product by its lifting
bracket or by means of a fork-lift truck.
- Never lift the product by the power
cable or the hose or the pipe.
CAUTION
Crushing hazard
Minor or moderate personal injury
- Make sure the lifting bracket is
tightened before attempting to lift the
product. Tighten if necessary.
TM04 4094 0709

English (GB)
5
Proceed as follows:
1. Fit the guide rail bracket on the inside of the pit
and fasten it provisionally with anchor bolts.
2. Place the auto-coupling base unit on the bottom
of the pit.
Use a plumb line to establish the correct
positioning.
3. Fasten with heavy-duty expansion bolts.
Support the auto-coupling base unit so that it is
level when being fastened.
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
to the guide rail bracket.
6. Unscrew the provisionally fastened guide rail
bracket and fit it on top of the guide rails. Fasten
the bracket firmly to the pit wall.
7. Clean out debris from the pit before lowering the
pump into the pit.
8. Fit the guide claw to the outlet port of the pump.
Then slide the guide claw down the guide rails
and lower the pump into the pit by means of a
chain fastened to the lifting bracket. When the
pump reaches the auto-coupling base unit, the
pump will automatically connect tightly.
9. Hang up the end of the chain on a suitable hook
at the top of the pit and in such a way that 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.
3.1.3 Free-standing submerged installation
Pumps for free-standing submerged installation can
stand freely on the bottom of the pit or the like. The
pump must be installed on a ring stand. See fig. 2.
Fig. 2 Free-standing pump on ring stand
Fit a flexible union or coupling to the outlet in order
to facilitate service on the pump and easy separation
of pump and outlet line.
If a hose is used, make sure that the hose does not
buckle and that the inside diameter of the hose
matches that of the pump outlet.
If a rigid pipe is used, fit the union or coupling, non-
return valve and isolating valve in the order
mentioned when viewed from the pump.
If the pump is installed in muddy conditions or on
uneven ground, support the pump on bricks or a
similar 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 means of a
chain secured to the lifting bracket of the pump.
Place the pump on a plane, solid foundation to
make sure that the pump stands securely.
3. Hang up the end of the chain on a suitable hook
at the top of the pit and in such a way that 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.
The guide rails must not have any axial
play as this will cause noise during pump
operation.
Make sure that the cable is not sharply
bent or pinched.
TM04 4095 0709
Make sure that the cable is not sharply
bent or pinched.

English (GB)
6
3.2 Electrical connection
The supply voltage and frequency are marked on the
pump nameplate. The voltage tolerance must be
within - 5 %/+ 5 % of the rated voltage. Make sure
that the motor is suitable for the power supply
available at the installation site.
All pumps are supplied with 10 m cable and a free
cable end.
Pumps with sensors must be connected to a GU01
or GU02 pump controller. See fig. 3 for DOL-
connected pumps or fig. 4 for star-delta-connected
pumps. For further information, see the installation
and operating instructions for the selected control
box or pump controller at www.grundfos.com.
3.3 Thermal protection
One thermal switch is built into the motor winding
and will break the circuit in case of over temperature.
In case of intermittent operation, with 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.
• Thermal sensor: A PT100 thermal sensors (PCA)
is installed.
The thermal switch must be connected according to
the wiring diagram fig. 3 or fig. 4. Make sure that the
alarm output will cause 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.
3.3.1 Checkings 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.
DANGER
Electric shock
Death or serious personal injury
- A motor protector, set to rated current
+10 %, must be installed by the
customer.
- Make sure that all protective equipment
has been connected correctly.
DANGER
Electric shock
Death or serious personal injury
- It is not permitted to extend the pump
cable. Contact Grundfos to get the right
cable length.
DANGER
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 for the pump is opened.
Carry out the electrical connection in
accordance 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 contact gap of 3
mm in all poles.
The classification of the installation site
must be approved by the local fire-fighting
authorities in each individual case.

English (GB)
7
3.3.2 Wiring diagrams
Fig. 3 Direct-on-line starting
Fig. 4 Star-delta starting
TM04 4096 0709TM04 4097 3316
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
TMyMdMC
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
21 T/P
S/S
T/P
S/S
11
OP.TR

English (GB)
8
3.4 Frequency converter operation
Before installing a frequency converter, calculate the
lowest allowable frequency in the installation in order
to avoid zero flow.
3.4.1 Requirements
• The thermal protection of the motor must be
connected.
• Do not reduce the motor speed to less than 30 %
of rated speed.
• Keep the flow velocity above 1 m/sec.
• Let the pump run at rated speed at least once a
day in order to prevent sedimentation in the pipe
system.
• Do not exceed the frequency indicated on the
nameplate. In this case there is a risk of motor
overload.
• 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 input and output filters on the frequency
converter. See data sheet for the frequency
converter used.
3.4.2 Possible consequences
When operating the pump 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 used for advice as to how to
reduce the acoustic noise.
4. Starting up the product
You can start up the product using either direct-on-
line (DOL) starting or star-delta (Y/D) starting. The
selection of the starting method depends on several
considerations regarding usage and mains supply
conditions.
4.1 Operating modes
DANGER
Electric shock
Death or serious personal injury
- Before installation and the first startup
of the product, 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 power supply cannot
be accidentally switched on.
CAUTION
Sharp element
Minor or moderate personal injury
- Wear protective clothing (gloves) when
working on the pump or touching the
impeller.
Before starting the product:
- Make sure that the fuses have been
removed.
- Make sure that all protective equipment
has been connected correctly.
WARNING
Electric shock
Death or serious personal injury
- The pump must be stopped by signal
from the level sensors depending on the
S1 or S3 operation modes.
- The pump must be stopped when the
liquid level falls below the top cover
(S1) when operated continuously in S1
mode.
- The pump must be stopped when the
liquid level falls below the mid stator
housing (S3) when operated
intermittently in S3 mode.

English (GB)
9
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 5 Operating levels of DPK
S3, intermittent operation
S3 operation is a series of identical duty cycles (TC)
each with a constant load for a period, followed by a
rest period. Thermal equilibrium is not reached
during the cycle. See fig. 6.
Fig. 6 S3 operation
S1, continuous operation
In this operating mode, the pump can operate
continuously without being stopped for cooling.
Being completely submerged, the pump is
sufficiently cooled by the surrounding liquid. See fig.
7.
Fig. 7 S1 operation
4.2 Checking the direction of rotation
Check the direction of rotation in the following way
every time the pump is connected to a new
installation.
Proceed as follows:
1. Remove the pump from the system. Let the pump
hang from a lifting device, for example the hoist
used for lowering the pump into the pit.
2. Start and run the pump for a few seconds.
3. Observe the jerk of the pump. If the pump jerks
counterclockwise, the direction of rotation is
correct. See fig. 8.
4. Reinstall the pump in the system.
In case the direction of rotation is wrong, interchange
any two phases in the power cable.
Fig. 8 Jerk direction
TM04 4124 0809TM04 9231 3710TM02 7776 4003
S1
S3
P
Stop TC
Operation
P
t
Only start and run an unsubmerged pump
for a few seconds to check the direction of
rotation.
TM04 4118 0809

English (GB)
10
4.3 Preparing for startup
Before starting the product, follow the steps below:
• Check that the fuses have been removed.
• Check that the impeller can rotate freely by
turning the impeller by hand.
– Wear protective clothing (gloves) when
touching the impeller.
• Check the condition of the oil.
See section 8.4.5 Oil check and oil change.
• Check the direction of the rotation.
See section 4.2 Checking 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.
4.4 Startup
Proceed as follows:
1. Switch on the power supply.
2. Open the isolating valves, if fitted.
3. Check that the motor is 2/3 covered with liquid.
If the liquid level is below that, add liquid to the
pit until the minimum level is reached.
4. Vent the pump by tilting it by means of the lifting
chain and let trapped air escape.
5. Run the pump briefly, and check if the liquid level
is falling. A correctly vented pump will quickly
lower the liquid level.
6. Start the pump.
5. Handling and storing the product
5.1 Handling the product
When handling the product, observe the following
points:
• Check the lifting equipment and lifting
instructions.
See section 3.1.1 Lifting the product.
• Move the pump only with a fork-lift or a lifting
crane.
5.2 Storing the product
5.2.1 Warehouse storage
• The warehouse must be dry and free from
corrosive gases, vapours or vibrations which
might damage the pump.
• Store the pump in a vertical position on a pallet or
a stand to keep the pump off the floor and
facilitate easy removal.
• Coil up the cable, and seal the open end tightly
with waterproof plastic and tape or a cable cap.
Do this to prevent moisture from penetrating into
the motor which will cause severe damage to the
windings.
• Give all unpainted surfaces a light coat of oil or
grease to prevent corrosion.
• If new pumps are stored for more than two
months, turn the impeller by hand every two
months to prevent the mechanical seal faces
from seizing up. Failure to do this may result in
seal damage when the pump is started up again.
5.2.2 Storage in the pit (dry or wet)
• If an installed pump is not in operation for a long
time, check the insulation resistance and run the
pump for 30 minutes every month.
If the pump cannot be run due to lack of water in
the pit, inspect the pump and turn the impeller by
hand each month and before putting the pump
back into service. If the insulation resistance
drops below 10 megohms, contact Grundfos.
• When the pump is not in service, disconnect the
power supply from the control panel.
• If the pump is disconnected from the control
cabinet when not in service, protect the cable
end as described in section 5.2.1 Warehouse
storage.
The pump must not run dry.
In case of abnormal noise or vibrations
from the pump or other pump or power
supply failure, stop the pump immediately.
Do not attempt to restart the pump until the
cause of the fault has been found and
corrected.
CAUTION
Sharp element
Minor or moderate personal injury
- Wear protective clothing (gloves) when
working on the pump.

English (GB)
11
6. Product introduction
6.1 Product description
Fig. 9 DPK pump
Fig. 10 DPK.V pump
6.2 Applications and intended use
DPK pumps are used for removal of surface,
drainage and underground water in permanent or
temporary installations. DPK.V pumps can
additionally be used for effluent and screened
wastewater.
6.3 Improper operating methods
The operational safety of the pump is only
guaranteed if it is used in accordance with section
6.2 Applications and intended use.
6.4 Approvals
The standard version of the DPK pumps has been
tested by TÜV according to EC Council Machinery
Directive 2006/42/EC, registration no. AM 50143414
and report no. 13009107 002.
TM04 4092 0709TM06 5236 4115
1
6
7
9
8
2
3
5
4
1
2
6
7
3
5
9
8
Pos. Description
1 Lifting bracket
2 Nameplate
3Motor
4 Flush-valve connection
5 Outlet flange
6 Cable inlet
7 Top cover
8 Ring stand
9 Pump housing
Other applications or the operation of
pumps in ambient and operating
conditions, which are not approved, are
considered improper and are not
permitted.
The pump is not allowed to be used for
drinking water.

English (GB)
12
6.5 Identification
6.5.1 Type key
The pump can be identified by the type designation
stated on the pump nameplate.
Example: DPK.15.80.22.5.0D
1Exception: Code 075 = 0.75 kW
6.5.2 Nameplate
Fix the extra nameplate supplied with the pump at
the installation site or keep it in the cover of this
booklet.
Fig. 11 Nameplate
Code Description Explanation
DPK Drainage pump Pump type
[ ] Semi-open impeller Impeller type
V Vortex impeller
15 Maximum solids
size [mm] Free passage
80 Nominal diameter of
pump outlet [mm] Pump outlet
22 Output power P2
22 = 2.2 kW1Power [kW]
[ ] Standard Equipment
S Sensor(s)
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
TM04 4093 1518
Pos. Description
1 Notified body
2 Type designation
3 Product number and serial number
4 Maximum head [m]
5Enclosure class
6 Maximum installation depth [m]
7 Number of phases
8 Frequency [Hz]
9 Speed [min-1]
10 Weight [kg]
11 Rated voltage [V] Star
12 Rated voltage [V] Delta
13 Insulation class
14 Rated current [A] Star
15 Rated current [A] Delta
16 Motor input power P1 [kW]
17 Motor output power P2 [kW]
18 Power factor
19 Maximum liquid temperature [°C]
20 Maximum flow [m3/h]
21 Production code, year and week
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
16
17
18
19
20
21
DK-8850 Bjerringbro Denmark
Type
Model
Hmax Qmax Tmax. :
P.c.
m l/s c
P,3,QVXOFODVV&RVĭ
96883812 Made in China
Motor ~ Hz P1/P2 kW
n min
-1
Weight kg A
A
V
V

English (GB)
13
7. Protection and control functions
7.1 Pump controllers
The pumps can be controlled via the Grundfos
controllers: LC, LCD 107, LC, LCD 108 and LC, LCD
110.
Fig. 12 Pump controllers
7.2 Level controllers
LC controllers are for single-pump installations. LCD
controllers are for two-pump installations.
The following LC and LCD pump controllers are
available for level control:
• LC 107, LCD 107 with air bells
• LC 108, LCD 108 with float switches
• LC 110, LCD 110 with water level electrodes.
In the following description, "level switch" can be air
bells, float switches or water level electrodes,
depending on the pump controller selected.
7.2.1 LC, LCD
The LC controller is fitted with two or three level
switches: one for start and one for stop of the pump.
The third level switch, which is optional, is for high-
level alarm.
The LCD controller is fitted with three or four level
switches: one for common stop and two for start of
the pumps. The fourth level switch, which is optional,
is for high-level alarm.
For further information, see the installation and
operating instructions for the pump controller
selected.
7.3 GU01 and GU02
GU01 is a monitoring device for monitoring the stator
temperature and water penetration into the motor. It
receives a digital signal.
GU02 is a monitoring device for monitoring 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 via a relay.
GU01 and GU02 are manufactured for Grundfos. For
further information, please contact your local
Grundfos company.
For further information, see the data sheets for GU01
and GU02 at www.grundfos.com.
TM04 4098 0709
S1
S3
E1 E2 E3
Min.
Max.
Max.
Min.

English (GB)
14
8. Servicing the product
The life of the product depends largely on the
operating conditions, so we strongly recommend
daily inspection and periodic servicing in order to
guarantee maximum product lifetime.
8.1 Safety instructions and requirements
8.2 Service documentation
Service documentation is available on
www.grundfos.com > International website >
Grundfos Product Center > Service & support.
If you have any questions, please contact the
nearest Grundfos company or service centre.
8.3 Contaminated products
The product will be classified as contaminated if it
has been used for a liquid which is injurious to health
or toxic.
If you request Grundfos to service the product,
contact Grundfos with details about the pumped
liquid before returning the product for service.
Otherwise, Grundfos can refuse to accept the
product for service.
Any application for service must include details
about the pumped liquid.
Clean the product in the best possible way before
you return it.
Costs of returning the product are to be paid by the
customer.
8.4 Maintenance
Under normal operating conditions, remove the
pump from the pit and inspect it once every year.
Under severe operating conditions where sand,
fibrous material and solids are involved, do this once
a month.
Check the following points:
• Electrical test of the motor
See sections 8.4.1 Checking the current and
voltage and 8.4.2 Checking the insulation
resistance.
• Outlet pressure and flow rate
See section 8.4.3 Checking the outlet pressure
and flow rate.
• Seal-sensor resistance
See section 8.4.4 Inspecting the seal sensor.
• Oil level and oil condition
See section 8.4.5 Oil check and oil change.
• Impeller clearance
See section 8.4.6 Inspection and adjustment of
impeller clearance.
8.4.1 Checking the current and voltage
Check the pump current and voltage. If the ammeter
reading exceeds the rated value or is far lower than
the rated value, there is a problem. The voltage must
be stable within - 5 %/+ 5 % of the rated value
throughout the operational period.
8.4.2 Checking the insulation resistance
If the insulation resistance has declined sharply
since the previous reading, this is an indication of
impending insulation failure, and the pump must be
scheduled for service even though the insulation
resistance may still be over 10 mega ohms.
8.4.3 Checking the outlet pressure and flow rate
Declining performance can indicate the need for an
overhaul. Regardless of performance, the pressure
and flow rate must be stable, and rapidly changing
pressure or flow rate indicate system problems on
the inlet or outlet side.
WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the fuses have been
removed or the main switch has been
switched off and locked in position 0.
Make sure the power supply cannot be
accidentally switched on.
WARNING
Crushing of hands
Death or serious personal injury
- Make sure that all rotating parts have
stopped moving.
Maintenance and service must be carried
out by specially trained persons.
WARNING
Biological hazard
Death or serious personal injury
- Flush the product thoroughly with clean
water and rinse the product parts in
water after dismantling.
The insulation resistance of the motor
must be measured at least once a month.
The outlet pressure and flow rate must be
measured at least once a month if a
flowmeter is available.

English (GB)
15
8.4.4 Inspecting the seal sensor
Check the resistance of the seal sensor with a
multimeter as shown in fig. 13.
Fig. 13 Resistance check
8.4.5 Oil check and oil change
Fig. 14 Position of oil plug
1. Loosen the oil plug. See fig. 14.
2. Remove the oil plug and check the oil level.
3. Take a sample to inspect the condition of the oil.
4. If the oil needs to be changed, place a clean
container under the pump to collect all the
drained-off oil.
5. Tilt the pump with the oil-filling hole pointing
downwards in order to drain the pump of oil.
If the drained oil is contaminated or opaque, this
is an indication of an impending mechanical shaft
seal failure. Replace the mechanical seal.
6. Fill fresh oil into the oil chamber through the oil
filling hole. Use lubrication oil ISO VG 32 Mobil
DTE 24 turbine oil 90 or equivalent.
8.4.6 Inspection and adjustment of impeller
clearance
Check the clearance between the impeller and the
wear plate. Recommended clearance is 0.3 - 0.5
mm. Replace or repair as necessary.
Do not use a megger as it will damage the
control circuit of the seal sensor.
TM04 4119 0809TM07 1898 2218
20 KΩ
TPTP
SS SS
Oil plug
CAUTION
Pressurised system
Minor or moderate personal injury
- When loosening the oil plug of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the oil plug until the pressure has been
fully relieved.
Used oil must be disposed of in
accordance with local regulations.

English (GB)
16
9. Fault finding the product
Before attempting to diagnose any fault, read and
observe the safety instructions in section 8.1 Safety
instructions and requirements.
For pumps with a sensor, start fault finding
by checking the status on the GU01 or
GU02 front panel. See installation and
operating instructions for GU01 or GU02.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
Fault Cause Remedy
The motor does not start,
the fuses blow or the
motor protector trips out
immediately.
Caution: Do not try to
start again.
1. Power supply failure, short circuit
or earth leakage in the cable or the
motor winding.
Have the cable and motor checked and
repaired by a qualified electrician.
2. The fuses blow due to use of wrong
type of fuse. Fit fuses of the correct type.
3. The impeller is blocked by
impurities. Clean the impeller.
4. Level pickup, float switch or
electrode is out of adjustment or
defective.
Check the level pickups, float switches or
electrodes.
5. Motor phase malfunction. Inspect the motor and the connections.
The pump operates, but
the motor protector trips
after a short while.
1. Low setting of the thermal relay in
the motor protector.
Set the relay in accordance with the
specifications on the pump nameplate.
2. Increased current consumption due
to large voltage drop.
Measure the voltage between two motor
phases. Tolerance: - 5 %/+ 5 %.
3. The impeller is blocked by
impurities. Clean the impeller.
4. The direction of rotation is wrong. Check the direction of rotation and possibly
interchange any two phases in the power
supply. See section 4.2 Checking the
direction of rotation.
The thermal switch of the
pump trips after a short
while.
1. The liquid temperature is too high.
Inadequate cooling.
Improve cooling or lower the liquid
temperature.
2. The viscosity of the pumped liquid
is too high. Dilute the pumped liquid.
3. Fault in the electrical connection.
(Y-connection of pump to D-
connection results in considerable
undervoltage)
Check and correct the electrical
connection.
The pump operates at
below-standard
performance and power
consumption.
1. The impeller is blocked by
impurities. Clean the impeller.
2. The direction of rotation is wrong. Check the direction of rotation and possibly
interchange any two phases in the power
supply. See section 4.2 Checking the
direction of rotation.
The pump operates, but
gives no liquid.
1. There is air in the pump. Vent the pump twice.
2. The outlet valve is closed or
blocked.
Check the outlet valve and open and/or
clean it if necessary.
3. The non-return valve is blocked. Clean the non-return valve.
The pump is clogged.
1. The liquid contains large particles. Select a pump with a larger size of
passage.
2. A float layer has formed on the
surface. Install a mixer in the pit.

English (GB)
17
10. Technical data
10.1 Operating conditions
10.1.1 Operating mode
The pumps are designed for continuous operation,
S1, or intermittent operation, S3.
Operating mode S3 means that within 10 minutes the
pump must be in operation for 4 minutes and
stopped for 6 minutes.
10.1.2 Maximum starts per hour
DPK: Maximum 30 starts per hour
10.1.3 pH value
Pumps in permanent installations can cope with pH
values ranging from 4 to 10.
10.1.4 Liquid temperature
0 to 40 °C
10.1.5 Ambient temperature (if the pump is not
fully submerged)
0 to 40 °C
10.1.6 Density of pumped liquid
Maximum 1000 kg/m3
In the case of higher densities, contact Grundfos.
10.1.7 Maximum operating pressure
5.7 bar
10.1.8 Installation depth
DPK: Maximum 20 m below liquid level
10.1.9 Max. altitude above sea level
2000 m
10.2 Dimensions and weights
10.2.1 Dimensions
See Dimensions and weights in the appendix.
11. Disposing of the product
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.
The crossed-out wheelie bin symbol on
a product means that it must be
disposed of separately from household
waste. When a product marked with this
symbol reaches its end of life, take it to a
collection point designated by the local
waste disposal authorities. The separate collection
and recycling of such products will help protect the
environment and human health.
See also end-of-life information at
www.grundfos.com/product-recycling.

Appendix
18
Appendix 1
Dimensions and weights
DPK
Fig. 1 Dimensions of pump without accessories
TM04 4099 0709
Pump type ACDEFHDN1DN2 Weight
[kg]
DPK.10.50.075 398 226 88 127 196 40 48
See
section
Outlet
flange
31
DPK.10.50.15 428 226 88 127 196 40 48 35
DPK.10.80.22, 50 Hz 456 246 102 145 212 46 48 40
DPK.10.80.22, 60 Hz 448 246 88 147 215 36 48 60
DPK.15.80.37 625 279 119 160 246 39 75 113
DPK.15.80.55 792 380 142 222 317 66 75 118
DPK.15.100.75 792 375 138 220 312 59 72 166
DPK.20.100.110 840 375 151 220 325 59 90 177
DPK.20.100.150 840 375 151 220 325 59 90 300
DPK.20.150.190 1023 483 181 432 416 113 110 300
DPK.20.150.220 1023 483 181 432 416 113 110 300

Appendix
19
Fig. 2 Dimensions of pump on ring stand
TM04 4100 0709
Pump type V1 V2 V2F V3 V4 V6 V6F V7 V7F V8 Weight
[kg]
DPK.10.50.075 425 232 202 70 223 354 384 50 50 223 31
DPK.10.50.15 452 232 202 70 223 354 384 50 50 223 35
DPK.10.80.22, 50 Hz 483 306 230 70 235 415 477 80 80 235 40
DPK.10.80.22, 60 Hz 475 296 220 70 223 411 473 80 80 223 60
DPK.15.80.37 597 309 233 80 280 452 514 80 80 280 113
DPK.15.80.55 734 356 280 100 350 549 611 80 80 350 118
DPK.15.100.75 734 384 309 100 350 572 630 100 100 350 166
DPK.20.100.110 780 384 309 100 350 572 630 100 100 350 177
DPK.20.100.150 780 384 309 100 350 572 630 100 100 350 300
DPK.20.150.190 1163 513 362 90 380 708 778 150 150 407 300
DPK.20.150.220 1163 513 362 90 380 708 778 150 150 407 300

Appendix
20
Fig. 3 Dimensions of pump on auto coupling
TM04 4101 0709
Pump type C F Z1Z2Z3Z4Z6Z7Z8Z9
DPK.10.50.075 226 196 355 120 70 120 569 396 284 50
DPK.10.50.15 226 196 382 120 70 120 569 396 284 50
DPK.10.80.22, 50 Hz 246 212 413 130 90 200 685 460 342 75
DPK.10.80.22, 60 Hz 246 215 405 130 90 200 679 454 344 75
DPK.15.80.37 279 246 517 130 90 200 701 476 357 75
DPK.15.80.55 380 317 634 130 90 200 802 577 419 75
DPK.15.100.75 375 312 634 150 90 200 870 585 430 75
DPK.20.100.110 375 325 680 150 90 200 884 599 430 75
DPK.20.100.150 375 325 680 150 90 200 884 599 430 75
DPK.20.150.190 483 416 1078 250 150 300 1083 743 540 90
DPK.20.150.220 483 416 1078 250 150 300 1083 743 540 90
Pump type Z10 Z11 Z12 Z13 Z14 Z15 Z16 ZDN1 ZM Weight
[kg]
DPK.10.50.075 1" 558 160 50 28 140 250 50 4 x M16 x 200 31
DPK.10.50.15 1" 588 160 50 28 140 250 50 4 x M16 x 200 35
DPK.10.80.22, 50 Hz 1" 610 154 50 46 200 250 80 4 x M16 x 200 40
DPK.10.80.22, 60 Hz 1" 612 164 50 46 200 250 80 4 x M16 x 200 60
DPK.15.80.37 1" 786 161 50 46 200 250 80 4 x M16 x 200 113
DPK.15.80.55 1" 926 134 50 46 200 250 80 4 x M16 x 200 118
DPK.15.100.75 1 1/4" 983 191 50 51 250 350 100 4 x M16 x 200 166
DPK.20.100.110 1 1/4" 1031 191 50 51 250 350 100 4 x M16 x 200 177
DPK.20.100.150 1 1/4" 1031 191 50 51 250 350 100 4 x M16 x 200 300
DPK.20.150.190 1 1/2" 1199 164 80 65 290 450 150 M20 * 200L 300
DPK.20.150.220 1 1/2" 1199 164 80 65 290 450 150 M20 * 200L 300