Grundfos DP 10.50 User manual

8
Original installation and operating instructions.
CONTENTS Page
1. Symbols used in this document 8
2. General description 9
2.1 Product drawings 9
2.2 Applications 9
2.3 Operating conditions 10
3. Delivery and handling 10
3.1 Transportation 10
3.2 Storage 10
4. Identification 11
4.1 Nameplate 11
4.2 Type Key 12
5. Approvals 13
5.1 Approval standards 13
5.2 Explanation to the Ex approval 13
6. Safety 14
6.1 Potentially explosive environments 14
7. Installation 15
7.1 Submerged installation on auto-coupling 15
7.2 Free-standing submerged installation 16
8. Electrical connection 17
8.1 Wiring diagrams 18
8.2 CU 100 control box 18
8.3 Pump controllers 19
8.4 Thermal switches 19
8.5 Frequency converter operation 20
9. Start-up 21
9.1 General start-up procedure 21
9.2 Operating modes 21
9.3 Direction of rotation 22
10. Maintenance and service 22
10.1 Inspection 23
10.2 Adjusting the impeller clearance 23
10.3 Cleaning the pump housing 24
10.4 Replacing the shaft seal 24
10.5 Oil change 25
10.6 Service kits 26
10.7 Contaminated pumps 26
11. Fault finding 27
12. Technical data 28
13. Disposal 28
1. Symbols used in this document
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.
Warning
These instructions must be observed
for explosion-proof pumps. It is
advisable also to follow these
instructions for standard pumps.
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.

9
2. General description
This booklet includes instructions for installation,
operation and maintenance of Grundfos DP and EF
submersible drainage and effluent pumps with
motors of 0.6 to 2.6 kW. Grundfos DP and EF
drainage and effluent pumps are portable and
designed for pumping domestic and industrial
drainage and effluent.
Two types of pumps are available:
• DP 10.50 and DP 10.65 drainage pumps with
semi-open type of impeller
• EF 30.50 effluent pump with semi-open type of
impeller.
The pumps are designed for free-standing
installation. DP 10.65.26 pumps can be installed on
an auto-coupling system.
The pumps can be controlled via the Grundfos
LC, LCD 107, LC, LCD 108, LC, LCD 110 pump
controllers or the Grundfos CU 100 control box.
See installation and operating instructions for the
selected controller.
2.1 Product drawings
Fig. 1 DP 10.50 pump
Fig. 2 DP 10.65 pump
Fig. 3 EF 30.50 pump
Explanation to figures 1, 2 and 3:
2.2 Applications
DP 10 pumps are designed for pumping these
liquids:
• drainage and surface water
• groundwater
• industrial process water without solids or fibres.
EF 30 pumps are designed for pumping these
liquids:
• drainage and surface water with small impurities
• effluent with fibres, e.g. from laundries
• effluent without discharge from toilets
• effluent from commercial buildings without
discharge from toilets.
The compact design makes the pumps suitable for
both temporary and permanent installation.
TM02 7339 3009TM02 7340 3203
4
9
10
1
2
5
6
7
8
TM02 7341 3009
Pos. Description
1 Cable plug
2 Nameplate
3 Discharge port Rp 2
4 Discharge flange DN 65, PN 10
5 Lifting bracket
6 Stator housing
7 Oil screw
8Clamp
9 Pump housing
10 Suction strainer (DP pumps only)

10
2.3 Operating conditions
The DP and EF pumps are designed for intermittent
operation (S3). When completely submerged, the
pumps can also operate continuously (S1).
See 9.2 Operating modes.
The Grundfos EF pumps are suitable for pumping
effluent and other liquids with solids up to 30 mm.
Installation depth
Maximum 10 metres below liquid level.
Operating pressure
Maximum: 6 bar.
Intermittent operation
Maximum 20 starts per hour.
pH value
DP and EF pumps in permanent installations can be
used for pumping liquids with a pH value between 4
and 10.
Liquid temperature
0 °C to + 40 °C.
For short periods (maximum 15 minutes) a
temperature of up to +60 °C is permissible (non-Ex
versions only).
Density and viscosity of pumped liquid
When pumping liquids with a density and/or a
kinematic viscosity higher than that of water,
use motors with correspondingly higher outputs.
3. Delivery and handling
The pump may be transported and stored in a
vertical or horizontal position. Make sure that it
cannot roll or fall over.
3.1 Transportation
All lifting equipment must be rated for the purpose
and checked for damage before any attempts to lift
the pump. The lifting equipment rating must under no
circumstances be exceeded. The pump weight is
stated on the pump nameplate.
The polyurethane-embedded plug prevents water
from penetrating into the motor via the motor cable.
3.2 Storage
During long periods of storage, the pump must be
protected against moisture and heat.
After a long period of storage, the pump should be
inspected before it is put into operation. Make sure
that the impeller can rotate freely. Pay special
attention to the the condition of the shaft seals and
the cable entry.
Warning
Explosion-proof pumps must never
pump liquids with a temperature higher
than +40 °C.
Warning
Always lift the pump by its lifting
bracket or by means of a fork-lift truck
if the pump is fixed on a pallet.
Never lift the pump by means of the
motor cable or the hose/pipe.

11
4. Identification
4.1 Nameplate
The nameplate states the operating data and
approvals applying to the pump. The nameplate is
fixed with rivets to the side of the motor housing
close to the cable entry.
Fix the additional nameplate supplied with the pump
close to the tank.
Fig. 4 Nameplate
TM03 8017 0207
Pos. Description Pos. Description
1 Ex mark 15 EN approval
2 Type designation 16 Maximum liquid temperature
3 Product number 17 Maximum flow rate
4 Production code (year/week) 18 Explosion protection
5 Maximum head 19 Enclosure class to IEC
6 Maximum installation depth 20 Rated speed
7 Number of phases 21 Frequency
8 Rated voltage, Δ22 Rated current, Δ
9 Rated voltage, Y 23 Rated current, Y
10 Rated power input 24 Shaft power
11 Power factor 25 Insulation class
12 Starting capacitor 26 Run capacitor
13 Country of production 27 Weight without cable
14 CE mark

12
4.2 Type Key
Please note that not all combination options are
available.
Code Example DP 10 .50 .15 .EX .2 .1 .5 02
DP
EF
Type range
Grundfos drainage pump
Grundfos effluent pump
10 Pump passage Maximum solids size [mm]
50 Pump discharge Nominal diameter of pump discharge port [mm]
15 Output power, P2 P2 = Code number from type designation/10 [kW]
[ ]
A
Equipment
Standard (without equipment)
Pump equipped with a control box CU 100
[ ]
Ex
Ex version
Standard version of submersible drainage pumps
Pump designed to the ATEX standard indicated or Australian standard, AS 2430.1
2Number of poles 2-pole, 3000 min-1, 50 Hz
1
[ ]
Number of phases
Single-phase motor
Three-phase motor
5Mains frequency 50 Hz
02
0B
0C
Voltage and starting method
230 V, DOL
400-415 V, DOL
230-240 V, DOL
[ ]
A
B
Generation
1st generation
2nd generation
3rd generation, etc
The pumps belonging to the individual generations differ in design but are similar in terms of power
rating.
[ ] Material in pump Standard material in pump

13
5. Approvals
The standard version of DP and EF pumps has been
tested by VDE, and the explosion-proof version
approved by KEMA according to the ATEX directive.
5.1 Approval standards
The standard variants are approved by LGA (notified
body under the Construction Products Directive)
according to EN 12050-1 or EN 12050-2 as specified
on the pump nameplate.
5.2 Explanation to the Ex approval
The explosion protection classification of the pump is
CE 0344 II 2 G Ex d IIB T4 X.
5.2.1 Australia
Ex variants for Australia are approved as Ex nC II T3 X according to IEC 79-15 (corresponding to AS 2380.9).
Directive/
standard Code Description
ATEX
CE
0344 =CE marking of conformity according to the ATEX directive 94/9/EC, Annex X.
0344 is the number of the notified body which has certified the quality system
for ATEX.
= Marking of explosion protection
II = Equipment group according to the ATEX directive, Annex II, point 2.2, defining
the requirements applicable to the equipment in this group
2=
Equipment category according to the ATEX directive, Annex II, point 2.2,
defining the requirements applicable to the equipment in this category
G = Explosive atmospheres caused by gases, vapours or mists
Harmonized
European
standard
EN 60079-0
Ex = The equipment conforms to harmonized European standard
d = Flame-proof enclosure according to EN 60079-1: 2007
II = Suitable for use in explosive atmospheres (not mines)
B=
Classification of gases, see EN 60079-0: 2006, Annex A.
Gas group B includes gas group A.
T4 = Maximum surface temperature is 135 °C
X=
The letter X in the certificate number indicates that the equipment is subject to
special conditions for safe use. The conditions are mentioned in the certificate
and the installation and operating instructions.
Standard Code Description
IEC 79-15: 1987
Ex = Area classification according to AS 2430.1
n = Non-sparking according to AS 2380.9: 1991, section 3 (IEC 79-15: 1987)
C = The environment is adequately protected against sparking components
II = Suitable for use in explosive atmospheres (not mines)
T3 = Maximum surface temperature is 200 °C
X=
The letter X in the certificate number indicates that the equipment is subject to
special conditions for safe use. The conditions are mentioned in the certificate
and the installation and operating instructions.

14
6. Safety
For safety reasons, all work in tanks must be
supervised by a person outside the pump tank.
Tanks for submersible drainage and effluent pumps
may contain drainage or effluent 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
pump must be carried out under strict observance of
the hygiene regulations in force.
6.1 Potentially explosive environments
Use explosion-proof pumps for applications in
potentially explosive environments.
Warning
Pump installation in tanks must be
carried out by specially trained
persons.
Work in or near tanks must be carried
out according to local regulations.
Warning
Persons must not enter the installation
area when the atmosphere is explosive.
Warning
It must be possible to lock the mains
switch in position 0. Type and
requirements as specified in
EN 60204-1, 5.3.2.
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.
Note
It is advisable to make all maintenance
and service work when the pump is
placed outside the tank.
Warning
Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary.
Carelessness during lifting or
transportation may cause injury to
personnel or damage to the pump.
Warning
DP and EF pumps must under no
circumstance pump combustible
liquids.
Warning
The classification of the installation
site must be approved by the local fire-
fighting authorities in each individual
case.
Warning
The explosion protection classification
of the pump is CE II 2 G,
Ex d IIB T4 X. The classification of the
installation site must be approved by
the local fire-fighting authorities in
each individual case.
Warning
Special conditions for safe use of DP
and EF explosion-proof pumps:
1. Bolts used for replacement must be
class A2-70 or better according to
EN/ISO 3506-1.
2. The level of pumped liquid must be
controlled by two stop level switches
connected to the motor control circuit.
The minimum level depends on the
installation type and is specified in
these installation and operating
instructions.
3. Make sure the permanently attached
cable is suitably mechanically
protected and terminated in a suitable
terminal board placed outside the
potentially explosive area.
4. The thermal protection in the stator
windings has a nominal cut-out
temperature of 150 °C guaranteeing
the disconnection of the power supply;
the resetting of the supply is manual.

15
7. Installation
Fit the extra nameplate supplied with the pump at the
installation site or keep it in the cover of this booklet.
All safety regulations must be observed at the
installation site, e.g. the use of blowers for fresh-air
supply to the tank.
Prior to installation, check the oil level in the oil
chamber. See section 10. Maintenance and service.
The pumps are suitable for different installation types
which are described in sections 7.1 Submerged
installation on auto-coupling and 7.2 Free-standing
submerged installation.
The pump housings have an Rp 2 discharge port or a
DN 65, PN 10 flange.
7.1 Submerged installation on auto-
coupling
DP 10.65.26 pumps for permanent installation can
be installed on a stationary auto-coupling guide rail
system or a “hookup” auto-coupling system.
Both auto-coupling systems facilitate maintenance
and service as the pump can easily be lifted out of
the tank.
DP 10.65.26 pumps have a cast DN 65, PN 10
discharge flange.
Auto-coupling guide rail system
See fig. B, page 505.
Proceed as follows:
1. Drill mounting holes for the guide rail bracket on
the inside of the tank and fasten the guide rail
bracket provisionally with two screws.
2. Place the auto-coupling base unit on the bottom
of the tank. Use a plumb line to establish the
correct positioning. Fasten the auto coupling with
expansion bolts. If the bottom of the tank is
uneven, the auto-coupling base unit must be
supported so that it is level when being fastened.
3. Assemble the discharge line in accordance with
the generally accepted procedures and without
exposing the line to distortion or tension.
4. Place the guide rails on the auto-coupling base
unit and adjust the length of the rails accurately to
the guide rail bracket at the top of the tank.
5. Unscrew the provisionally fastened guide rail
bracket, fit it on top of the guide rails and finally
fasten it firmly to the tank wall.
6. Clean out debris from the tank before lowering
the pump into the tank.
7. Fit the guide claw to the discharge port of the
pump.
Caution
Prior to installation, make sure the tank
bottom is even.
Warning
Before beginning the installation,
switch off the power supply and lock
the mains switch in position 0.
Any external voltage connected to the
pump must be switched off before
working on the pump.
Note
The pumps are designed for
intermittent operation. When
completely submerged in the pumped
liquid, the pumps can also operate
continuously. See section 12. Technical
data.
Warning
Do not put your hands or any tool into
the pump suction or discharge port
after the pump has been connected to
the power supply, unless the pump has
been switched off by removing the
fuses or switching off the mains switch.
It must be ensured that the power
supply cannot be accidentally switched
on.
Caution
We recommend to always use Grundfos
accessories to avoid malfuncions due
to incorrect installation.
Warning
Only use the lifting bracket for lifting
the pump. Do not use it to hold the
pump when in operation.
Warning
Before beginning installation
procedures, make sure that the
atmosphere in the tank is not
potentially explosive.
Note
Make sure that the pipework is installed
without the use of undue force.
No loads from the pipework weight
must be carried by the pump.
We recommend the use of loose
flanges to ease the installation and to
avoid pipe tension at flanges and bolts.
Note
Do not use elastic elements or bellows
in the pipework; these elements should
never be used as a means to align the
pipework.
Note
The guide rails must not have any axial
play as this would cause noise during
pump operation.

16
8. Slide the guide claw between the guide rails and
lower the pump into the tank by means of a chain
secured to the lifting bracket of the pump.
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 tank and in such a way that the
chain cannot come into contact with the pump
housing.
10. Adjust the length of the motor 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 tank.
Make sure that the cables are not sharply bent or
pinched.
11. Connect the motor cable and the monitoring
cable, if any.
Hookup auto-coupling system
See fig. C, page 506.
Proceed as follows:
1. Fit the crossbar in the tank.
2. Fit the stationary part of the auto coupling on top
of the crossbar.
3. Fit the adapted piece of pipe for the movable part
of the hookup auto coupling to the pump
discharge port.
4. Fasten a shackle and a chain to the movable part
of the hookup auto coupling.
5. Clean out debris from the tank before lowering
the pump.
6. Lower the pump into the tank by means of the
chain secured to the lifting bracket. When the
movable part of the auto coupling reaches the
stationary part, the two will automatically connect
tightly.
7. Hang up the end of the chain on a suitable hook
at the top of the tank and in such a way that the
chain cannot come into contact with the pump
housing.
8. Adjust the length of the motor 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 tank.
Make sure that the cables are not sharply bent or
pinched.
9. Connect the motor cable and the monitoring
cable, if any.
7.2 Free-standing submerged installation
Pumps for free-standing submerged installation can
stand freely on the bottom of the tank or the like.
See fig. D, page 507, and fig. E, page 508.
In order to facilitate service on the pump, fit a flexible
union or coupling to the elbow on the discharge line
for easy separation.
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 discharge port.
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, we recommend to support the pump
on bricks or a similar support.
Proceed as follows:
1. Fit a 90 ° elbow to the pump discharge port and
connect the discharge pipe/hose.
2. Lower the pump into the liquid by means of a
chain secured to the lifting bracket of the pump.
We recommend to place the pump on a plane,
solid foundation. Make sure that the pump is
hanging from the chain and not the cable.
3. Hang up the end of the chain on a suitable hook
at the top of the tank and in such a way that the
chain cannot come into contact with the pump
housing.
4. Adjust the length of the motor 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. Make sure that the cables are
not sharply bent or pinched.
5. Connect the motor cable and the monitoring
cable, if any.
Note
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.
Note
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.
Note
The free end of the cable must not be
submerged as water may penetrate
through the cable into the motor.

17
8. Electrical connection
The supply voltage and frequency are marked on the
pump nameplate. The voltage tolerance must be
within –10 %/+6 % 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.
The pump must be connected to one of these two
controller types:
• a control box with motor-protective circuit
breaker, such as Grundfos CU 100 control box
• a Grundfos LC, LCD 107, LC, LCD 108 or
LC, LCD 110 pump controller.
See fig. 5 or 6 and the installation and operating
instructions for the selected control box or pump
controller.
In potentially explosive environments you have two
options:
• Use float switches made for Ex environment and
a safety barrier in combination with either DC,
DCD or LC, LCD 108.
• Use air bells in combination with LC, LCD 107.
For more information about the function of the
thermal switches, see 8.4 Thermal switches.
Warning
Connect the pump to an external mains
switch which ensures all-pole
disconnection with a contact
separation according to EN 60204-1,
5.3.2.
It must be possible to lock the mains
switch in position 0. Type and
requirements as specified in
EN 60204-1, 5.3.2.
The electrical connection must be
carried out in accordance with local
regulations.
Warning
The pumps must be connected to a
control box with a motor protection
relay with IEC trip class 10 or 15.
Warning
Pumps for hazardous locations must be
connected to a control box with a motor
protection relay with IEC trip class 10.
Warning
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the
free end of the power cable in
potentially explosive environments.
The explosion protection classification
of the pump is CE II 2 G,
Ex d IIB T4 X. The classification of the
installation site must be approved by
the local fire-fighting authorities in
each individual case.
On explosion-proof pumps, make sure
that an external earth conductor is
connected to the external earth
terminal on the pump using a
conductor with a secure cable clamp.
Clean the surface of the external earth
connection and mount the cable clamp.
The cross section of the earth
conductor must be at least 4 mm2, e.g.
type H07 V2-K (PVT 90 °) yellow/green.
Make sure that the earth connection is
protected against corrosion.
Make sure that all protective equipment
has been connected correctly.
Float switches used in potentially
explosive environments must be
approved for this application. They
must be connected to the Grundfos
LC, LCD 108 pump controller via the
intrinsically safe LC-Ex4 barrier to
ensure a safe circuit.
Warning
If the supply cable is damaged, it must
be replaced by the manufacturer, its
service agent or a similarly qualified
person.
Caution
Set the motor-protective circuit breaker
to the rated current of the pump.
The rated current is stated on the pump
nameplate.
Warning
If the pump has an Ex mark on the
nameplate, make sure that the pump is
connected in accordance with the
instructions given in this booklet.
Warning
Before installation and the first start-up
of the pump, check the condition of the
cable visually to avoid short circuits.

18
8.1 Wiring diagrams
Fig. 5 Wiring diagram for single-phase pumps
Fig. 6 Wiring diagram for three-phase pumps
8.2 CU 100 control box
The CU 100 control box incorporates a motor-
protective circuit breaker and is available with level
switch and cable.
Single-phase pumps: A run capacitor must be
connected to the control box.
For capacitor size, see the table:
Start and stop levels: The difference in level
between start and stop can be adjusted by changing
the free cable length.
Long free cable = large difference in level
Short free cable = small difference in level.
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the upper edge of the clamp on the pump.
• Install the start level switch in such a way that
the pump is started at the required level; however,
the pump must always be started before the liquid
level reaches the bottom inlet pipe to the tank.
Fig. 7 Start and stop levels
TM02 5587 4302TM02 5588 3602
Pump type Run capacitor
[μF] [V]
DP and EF 30 450
Note
Both the two following points must be
observed.
150˚C160˚C
PE
123 645
1
T3T2 T1
LN
PE
150˚C170˚C
PE
123 645
3
T3T2 T1
L1
PE
L2 L3
Warning
The CU 100 control box must not be
used for Ex applications.
See section 8.3 Pump controllers.
Warning
The pump must not run dry.
An additional level switch must be
installed to ensure that the pump is
stopped in case the stop level switch is
not operating. See fig. 7.
The pump must be stopped when the
liquid level reaches the upper edge of
the clamp on the pump.
Float switches used in potentially
explosive environments must be
approved for this application.
They must be connected to the
Grundfos DC, DCD or LC, LCD 108
pump controller via an intrinsically safe
barrier to ensure a safe circuit.
TM02 7429 2709
Alarm
Stop
Start
Additional
stop

19
8.3 Pump controllers
The following LC and LCD pump controllers are
available:
LC controllers are for one-pump-installations and
LCD controllers are for two-pump-installations.
• LC 107 and LCD 107 with air bells
• LC 108 and LCD 108 with float switches
• LC 110 and LCD 110 with electrodes.
In the following description, "level switches" can be
air bells, float switches or electrodes, depending on
the pump controller selected.
Controllers for single-phase pumps incorporate
capacitors.
The LC controller is fitted with two or three level
switches: One for start and the other for stop of
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.
When installing the level switches, observe the
following points:
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the middle of the motor housing.
• Install the start level switch in such a way that
the pump is started at the required level; however,
the pump must always be started before the liquid
level reaches the bottom inlet pipe to the tank.
• If installed, always install the high-level alarm
switch about 10 cm above the start level switch;
however, the alarm must always be given before
the liquid level reaches the inlet pipe to the tank.
For further information, see the installation and
operating instructions for the pump controller
selected.
8.4 Thermal switches
All pumps have two sets of thermal switches
incorporated in the stator windings.
Thermal switch, circuit 1 (T1-T3), breaks the circuit
at a winding temperature of approx. 150 °C.
Thermal switch, circuit 2 (T1-T2), breaks the circuit
at a winding temperature of approx. 170 °C
(three-phase pumps) or 160 °C (single-phase
pumps).
Maximum operating current of the thermal switches
is 0.5 A at 500 VAC and cos ϕ 0.6. The switches
must be able to break a coil in the supply circuit.
In the case of standard pumps, both thermal
switches can (when closing the circuit after cooling)
generate automatic restarting of the pump via the
controller.
Warning
The pump must not run dry.
An additional level switch must be
installed to ensure that the pump is
stopped in case the stop level switch is
not operating.
The pump must be stopped when the
liquid level reaches the upper edge of
the clamp on the pump.
Float switches used in potentially
explosive environments must be
approved for this application.
They must be connected to the
Grundfos DC, DCD or LC, LCD 108
pump controller via an intrinsically safe
barrier to ensure a safe circuit.
Note
This thermal switch must be connected
for all pumps.
Warning
After thermal cutout, explosion-proof
pumps must be restarted manually.
The thermal switch (circuit 2) must be
connected for manual restarting of
these pumps.
Warning
The separate motor-protective circuit
breaker/control box must not be
installed in potentially explosive
environments.

20
8.5 Frequency converter operation
For frequency converter operation please observe
the following information.
Requirements must be fulfilled.
Recommendations ought to be fulfilled.
Consequences should be considered.
8.5.1 Requirements
• The thermal protection of the motor must be
connected.
• Peak voltage and dU/dt must be in accordance
with the table below. The values stated are
maximum values supplied to motor terminals.
The cable influence has not been taken into
account. See data sheet for the frequency
converter used regarding the actual values and
cable influence on the peak voltage and dU/dt.
• If the pump is an Ex-approved pump, check if the
Ex certificate of the specific pump allows the use
of frequency converter.
• Set the frequency converter U/f ratio according to
the motor data.
• Local regulations/standards must be fulfilled.
8.5.2 Recommendations
Before installing a frequency converter, calculate the
lowest allowable frequency in the installation in order
to avoid zero flow.
• 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
piping system.
• Do not exceed the frequency indicated on the
nameplate. In this case there is risk of motor
overload.
• Keep the motor cable as short as possible.
The peak voltage will increase with the length of
the motor 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.
• Use screened motor cable if there is a risk that
electrical noise can disturb other electrical
equipment. See data sheet for the frequency
converter used.
8.5.3 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.
Max. repetitive peak
voltage
(V)
Max. dU/dt
UN400 V
(V/μsec.)
650 2000

21
9. Start-up
9.1 General start-up procedure
Proceed as follows:
1. Remove the fuses and check that the impeller can
rotate freely. Turn the impeller by hand.
2. Check the condition of the oil in the oil chamber.
See also section 10.5 Oil change.
3. Check whether the monitoring units, if used, are
operating satisfactorily.
4. Check the setting of the air bells, float switches or
electrodes.
5. Open the isolating valves, if fitted.
6. Lower the pump into the liquid and insert the
fuses.
7. Check that the system has been filled with liquid
and vented. The pump is self-venting.
8. Start the pump.
After one week of operation or after replacement of
the shaft seal, check the condition of the oil in the
chamber. See section 10. Maintenance and service
for procedure.
9.2 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 8 Operating levels
•S3, intermittent operation
Operating mode S3 means that within 10 minutes
the pump must be in operation for 4 minutes and
stopped for 6 minutes. See fig. 9. In this operating
mode, the pump is partly submerged in the
pumped liquid, i.e. the liquid level reaches at
minimum the middle of the motor. See fig. 8.
Fig. 9 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. 8.
Fig. 10 S1 operation
Warning
Before starting work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched off. It must be ensured that
the power supply cannot be
accidentally switched on.
Make sure that all protective equipment
has been connected correctly.
The pump must not run dry.
Warning
The pump must not be started if the
atmosphere in the tank is potentially
explosive.
Warning
It may lead to personal injuries or death
to open the clamp while the pump is
operating.
Caution
In case of abnormal noise or vibrations
from the pump, other pump failure 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 the fault corrected.
TM04 5175 2709TM04 4527 1509TM04 4528 1509
S1
S3
Operation
Stop
6 min.4 min.
10 min.
P
t
P
t
Operation
Stop

22
9.3 Direction of rotation
All single-phase pumps are factory-wired for the
correct direction of rotation.
Before starting up three-phase pumps, check the
direction of rotation.
An arrow on the motor housing indicates the correct
direction of rotation.
Correct direction of rotation is clockwise when
viewed from above. When started, the pump will jerk
in the opposite direction of the direction of rotation.
If the direction of rotation is wrong, interchange any
two of the phases in the power supply cable.
See fig. 5 or 6.
Checking the direction of rotation
The direction of rotation should be checked in one of
the following ways every time the pump is connected
to a new installation.
Procedure 1:
1. Start the pump and check the flow of liquid or the
discharge pressure.
2. Stop the pump and interchange any two of the
phases in the power supply cable.
3. Restart the pump and check the quantity of liquid
or the discharge pressure.
4. Stop the pump.
5. Compare the results taken under points 1 and 3.
The connection which gives the larger quantity of
liquid or the higher pressure is the correct
direction of rotation.
Procedure 2:
1. Let the pump hang from a lifting device, e.g. the
hoist used for lowering the pump into the tank.
2. Start and stop the pump while observing the
movement (jerk) of the pump.
3. If connected correctly, the pump will jerk in the
opposite direction of the direction of rotation.
See fig. 11.
4. If the direction of rotation is wrong, interchange
any two of the phases in the power supply cable.
See fig. 5 or 6.
Fig. 11 Jerk direction
10. Maintenance and service
Before carrying out maintenance and service, make
sure that the pump has been thoroughly flushed with
clean water. Rinse the pump parts in water after
dismantling.
Note
The pump may be started for a very
short period without being submerged
to check the direction of rotation.
TM02 7434 3403
Warning
Before starting work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched off. It must be ensured that
the power supply cannot be
accidentally switched on.
All rotating parts must have stopped
moving.
Warning
Except for service on the pump parts,
all other service work must be carried
out by Grundfos or a service workshop
authorized by Grundfos.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.

23
10.1 Inspection
Pumps running normal operation should be checked
every 3000 operating hours or at least once a year.
If the dry solids content of the pumped liquid is very
high or sandy, check the pump at shorter intervals.
Check the following points:
•Power consumption
See pump nameplate.
•Oil level and oil condition
When the pump is new or after replacement of the
shaft seal, check the oil level after one week of
operation.
If the pump has been in operation for a long
period of time, if the oil is drained off shortly after
the pump has been stopped, and if the oil is
greyish white like milk, it contains water.
If there is more than 20 % extra liquid (water) in
the oil chamber, the shaft seal is defective.
See section 10.4 Replacing the shaft seal. In any
case the oil should be changed after 3000
operating hours or once a year.
Use Shell Ondina 917 oil or similar type.
See sections 10.5 Oil change and 10.6 Service
kits.
The table states the quantity of oil in the oil
chamber:
•Cable entry
Make sure that the cable entry is watertight and
that the cables are not sharply bent and/or
pinched.
See section 10.6 Service kits.
•Pump parts
Check impeller, pump housing, etc. for possible
wear. Replace defective parts.
See section 10.6 Service kits.
•Ball bearings
Check the shaft for noisy or heavy operation (turn
the shaft by hand). Replace defective ball
bearings.
A general overhaul of the pump is usually
required in case of defective ball bearings or poor
motor function. This work must be carried out by
Grundfos or a service workshop authorized by
Grundfos.
10.2 Adjusting the impeller clearance
For position numbers, see page 516, 517 or 518.
Proceed as follows:
1. DP pumps only:
Loosen and remove the screws (pos. 188c)
holding the suction strainer (pos. 84). Remove the
strainer.
2. All pumps:
Loosen the locking screws (pos. 188b).
3. Loosen the adjusting screws (pos. 189) and push
the wear plate (pos. 162) until it touches the
impeller.
4. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then loosen all the
adjusting screws about half a turn.
5. Tighten the locking screws.
6. Rotate the impeller by hand to check that it is not
touching the wear plate.
7. DP pumps only:
Fit the suction strainer and tighten the screws
(pos. 188c).
See also section 10.3 Cleaning the pump housing.
Fig. 12 Pump viewed from suction port
Pump type Quantity of oil
in oil chamber[l]
DP and EF pumps
up to 1.5 kW 0.17
DP pumps, 2.6 kW 0.42
Note
Used oil must be disposed of in
accordance with local regulations.
Note
The impeller must be able to rotate
freely without touching the wear plate.
TM02 7431 2209

24
10.3 Cleaning the pump housing
For position numbers, see page 516, 517 or 518.
Proceed as follows:
Dismantling
1. Stand the pump upright.
2. Loosen and remove the clamp (pos. 92) joining
pump housing and motor.
3. Lift the motor part out of the pump housing
(pos. 50). As the impeller is fastened to the shaft
end, the impeller is removed together with the
motor part.
4. Clean the pump housing and the impeller.
Assembly
1. Place the motor part with impeller in the pump
housing.
2. Fit and tighten the clamp.
See also section 10.4 Replacing the shaft seal.
10.4 Replacing the shaft seal
As described in section 10.1 Inspection, the oil check
will reveal whether the shaft seal is intact.
If the oil contains more than 20 % water, it is an
indication that the shaft seal is defective and must be
replaced. If the shaft seal is not replaced, the motor
will be damaged .
For position numbers, see page 516, 517 or 518.
Proceed as follows:
1. Loosen and remove the clamp (pos. 92) joining
pump housing and motor.
2. Lift the motor part out of the pump housing
(pos. 50). As the impeller is fastened to the shaft
end, the impeller is removed together with the
motor part.
3. Remove the screw (pos. 188a) from the shaft
end.
4. Remove the impeller (pos. 49) from the shaft.
5. If it was not already done, drain the oil from the oil
chamber.
See section 10.5 Oil change.
The shaft seal is a complete unit for all pumps.
6. Remove the screws (pos. 188a) securing the
shaft seal (pos. 105).
7. Lift the shaft seal (pos. 105) out of the oil
chamber using the lever principle, the two
dismounting holes in the shaft seal carrier
(pos. 58) and two screwdrivers.
8. Check the bush (pos. 103).
If the bush is worn and must be replaced, the
pump must be checked by Grundfos or a service
workshop authorized by Grundfos.
If the bush is intact, proceed as follows:
1. Check and clean the oil chamber.
2. Lubricate the faces in contact with the shaft seal
with oil.
3. Insert the new shaft seal (pos. 105) using the
plastic bush included in the kit.
4. Tighten the screws (pos. 188a) securing the shaft
seal to 16 Nm.
5. Fit the impeller. Make sure that the key (pos. 9a)
is fitted correctly.
6. Fit and tighten the screw (pos. 188a) securing the
impeller to 22 Nm.
7. Place the motor part with impeller in the pump
housing (pos. 50).
8. Fit and tighten the clamp (pos. 92).
9. Fill the oil chamber with oil. See section 10.5 Oil
change.
For adjustment of impeller clearance, see section
10.2 Adjusting the impeller clearance.

25
10.5 Oil change
After 3000 operating hours or once a year, change
the oil in the oil chamber as described below.
If the shaft seal has been changed, the oil must be
changed as well. See section 10.4 Replacing the
shaft seal.
Draining of oil
1. Loosen and remove both oil screws to allow all
the oil to drain from the chamber.
2. Check the oil for water and impurities. If the shaft
seal has been removed, the oil will give a good
indication of the condition of the shaft seal.
Oil filling, pump lying down
See fig. 13.
1. Place the pump in such a position that it is lying
on the motor housing and the discharge flange
with the oil screws pointing upwards.
2. Fill oil into the oil chamber through the upper hole
until it starts running out of the lower hole. The oil
level is now correct.
For oil quantity, see section 10.1 Inspection.
3. Fit both oil screws using the packing material
included in the kit.
See section 10.6 Service kits.
Fig. 13 Oil filling holes
Oil filling, pump in upright position
1. Place the pump on a plane, horizontal surface.
2. Fill oil into the oil chamber through one of the
holes until it starts running out of the other hole.
For oil quantity, see section 10.1 Inspection.
3. Fit both oil screws using the packing material
included in the kit.
See section 10.6 Service kits.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.
Note
Used oil must be disposed of in
accordance with local regulations.
TM02 7433 3403
Oil filling
Oil level

26
10.6 Service kits
The following service kits are available for all pumps.
10.7 Contaminated pumps
If Grundfos is requested to service the pump,
Grundfos must be contacted with details about the
pumped liquid, etc. before the pump is returned for
service. Otherwise Grundfos can refuse to accept
the pump for service.
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.
The pump must be cleaned in the best possible way
before it is returned.
Warning
Before starting work on the pump, make sure that the fuses have been removed or the mains
switch has been switched off. It must be ensured that the power supply cannot be
accidentally switched on.
All rotating parts must have stopped moving.
Service kit Contents Pump type Material Order
number
Shaft seal Shaft seal complete
0.6 kW - 1.5 kW BQQP 96106536
BQQV 96645161
2.6 kW BQQP 96076123
BQQV 96645275
O-ring O-rings and gaskets for oil screws
0.6 kW - 1.5 kW NBR 96115107
FKM 96646049
2.6 kW NBR 96115108
FKM 96646060
Impeller Impeller complete with adjusting
screw, shaft screw and key
EF 30.50.06 96115101
EF 30.50.09 96115109
EF 30.50.11 96115102
EF 30.50.15 96115103
DP 10.50.09 96115104
DP 10.50.15 96115105
DP 10.65.26 96115106
Oil
1 litre of oil, type Shell Ondina 917.
See section 10. Maintenance and
service for required quantity in oil
chamber.
All types 96076171
Note
A possible replacement of the cable
must be carried out by Grundfos or a
service workshop authorized by
Grundfos.
Warning
If a pump has been used for a liquid
which is injurious to health or toxic,
the pump will be classified as
contaminated.

27
11. Fault finding
Warning
Before attempting to diagnose any fault, make sure that the fuses have been removed or the
mains switch has been switched off. It must be ensured that the power supply cannot be
accidentally switched on.
All rotating parts must have stopped moving.
Warning
All regulations applying to pumps installed in potentially explosive environments must be
observed.
It must be ensured that no work is carried out in potentially explosive atmosphere.
Fault Cause Remedy
1. Motor does not start. Fuses
blow or motor-protective
circuit breaker trips out
immediately.
Caution: Do not start again!
a) Supply failure; short-circuit;
earth-leakage fault in cable or
motor winding.
Have the cable and motor checked
and repaired by a qualified
electrician.
b) Fuses blow due to use of wrong
type of fuse. Install fuses of the correct type.
c) Impeller blocked by impurities. Clean the impeller.
d) Air bell, float switch or electrode
out of adjustment or defective. Readjust or replace the air bells, float switches or electrodes.
2. Pump operates, but motor-
protective circuit breaker
trips out after a short while.
a) Low setting of thermal relay in
motor-protective circuit breaker. Set the relay in accordance with the specifications on the nameplate.
b) Increased current consumption
due to large voltage drop. Measure the voltage between two motor phases.
Tolerance: – 10 %/+ 6 %.
Reestablish correct voltage supply.
c) Impeller blocked by impurities.
Increased current consumption
in all three phases.
Clean the impeller.
d) Adjustment of impeller
clearance incorrect. Readjust the impeller.
See section 10.2 Adjusting the
impeller clearance, fig. 10.
3. The pump’s thermal switch
trips out after the pump has
been operating for some
time.
a) Too high liquid temperature. Reduce the liquid temperature.
b) Too high liquid viscosity. Dilute the liquid.
c) Wrong electrical connection
(If the pump is star-connected to
a delta connection, the result
will be very low undervoltage).
Check and correct the electrical
installation.
4. Pump operates at below-
standard performance and
power consumption.
a) Impeller blocked by impurities. Clean the impeller.
Check the direction of rotation and
possibly interchange any two
phases of the incoming supply
cable. See section 9.3 Direction of
rotation.
b) Wrong direction of rotation.
5. Pump operates, but gives no
liquid. a) Discharge valve closed or blocked. Check the discharge valve and possibly open and/or clean.
b) Non-return valve blocked. Clean the non-return valve.
Vent the pump.c) Air in pump.