Grundfos DP 10.50, DP 10.65, EF 30.50 User Manual

CONTENTS

Page

1. General description 16

1.1 Applications 17

2. Safety 17

3. Transportation and storage 17

4. Installation 17

4.1 Installation on auto-coupling 17

4.2 Free-standing submerged installation 18

5. Electrical connection 18

5.1 CU 100 control box 19

5.2 Pump controllers 19

5.3 Thermal switches 20

6. Start-up 20

6.1 Operating modes 20

6.2 Direction of rotation 21

7. Maintenance and service 21

7.1 Inspection intervals 22

7.2 Adjustment of impeller clearance 22

7.3 Cleaning the pump housing 22

7.4 Checking/replacing the shaft seal 22

7.5 Oil change 23

7.6 Service kits 24

7.7 Contaminated pumps 24

8. Fault finding chart 25

9. Disposal 25

10. Technical data and operating conditions 26

Before beginning installation procedures,
these installation and operating instruc­tions should be studied carefully. The in­stallation and operation should also be in
accordance with local regulations and ac­cepted codes of good practice.

1. General description

Grundfos DP and EF wastewater pumps are portable
and designed for pumping domestic and industrial
wastewater.

Two types of pumps are available:

• DP 10.50 and DP 10.65 drainage pumps

• EF 30.50 effluent pump.
The pumps are designed for free-standing installa-

tion.
DP 10.65.26 pumps can be installed on an auto-cou-

pling system.
The pumps can be controlled via the Grundfos

LC/D 107, LC/D 108, LC/D 110 pump controllers or
the Grundfos CU 100 control box, see installation
and operating instructions for the selected unit.

1
2

3

Fig. 1 DP 10.50 pump

1
2

4

Fig. 2 DP 10.65 pump

1
2

3

Fig. 3 EF 30.50 pump

Explanation to figures 1, 2 and 3:

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
8 Clamp
9 Pump housing

10 Suction strainer (DP pumps only)

5
6

7

8

9

10

5
6

7

8

9

10

5
6

7

8

9

TM02 7339 3203TM02 7340 3203TM02 7341 3203

16

1.1 Applications

DP 10 pumps are designed for pumping

• drainage and surface water

• groundwater

• industrial process water without solids or fibres.
EF 30 pumps are designed for pumping

• drainage and surface water with small impurities

• wastewater with fibres, e.g. from laundries

• wastewater without discharge from toilets

• wastewater from commercial buildings without
discharge from toilets.

The compact design makes the pumps suitable for
both temporary and permanent installation.

The pumps are designed for free-standing installa­tion.

DP 10.65.26 pumps can be installed on an auto-cou­pling system.

1.1.1 Potentially explosive environments

Use explosion-proof pumps for applications in poten­tially explosive environments.

The explosion protection classification of
the pump is CE II 2 G, EEx d IIB T4.
The classification of the installation site
must in each individual case be approved
by the local fire-fighting authorities.

2. Safety

Pump installation in pits must be carried
out by specially trained persons.

For safety reasons, all work in pits must be super­vised by a person outside the pump pit.

Pits for submersible wastewater pumps contain
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 pump must be car­ried out under strict observance of the hygiene
regulations in force.

3. Transportation and storage

The pump may be transported and stored in a verti­cal or horizontal position. Make sure that it cannot
roll or fall over.

Always lift the pump by its lifting bracket, never by
the motor cable or the hose/pipe.

The polyurethane-embedded plug prevents water
from penetrating into the motor via the motor cable.

For 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 shaft seals and the cable entry.

4. Installation

The loose nameplate supplied with the pump should
be fixed at the installation site or kept 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 pit.

Prior to installation, check the oil level in the oil
chamber, see section 7. Maintenance and service.

The pumps are suitable for different installation
types which are described in sections 4.1 and 4.2.

The pump housings have an Rp 2 discharge port or a
DN 65, PN 10 flange.

Note: The pumps are designed for intermittent oper­ation. When completely submerged in the pumped
liquid, the pumps can also operate continuously.
See section 10. Technical data and operating condi-
tions.

4.1 Installation on auto-coupling

DP 10.65.26 pumps for permanent installation can
be mounted 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 pit.

DP 10.65.26 pumps have a cast DN 65, PN 10 dis­charge flange.

Before beginning installation procedures,
make sure that the atmosphere in the pit is
not potentially explosive.

Auto-coupling guide rail system, see fig. A,
page 289.

Proceed as follows:

1. Drill mounting holes for the guide rail bracket on
the inside of the pit and fasten the guide rail
bracket provisionally with two screws.

2. Place the auto-coupling base unit on the bottom
of the pit. Use a plumb line to establish the cor­rect positioning. Fasten with heavy-duty expan­sion bolts. If the bottom of the pit 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. Insert the guide rails in the auto-coupling base
unit and adjust the length of the rails accurately
to the guide rail bracket.

5. Unscrew the provisionally fastened guide rail
bracket, fit it on top of the guide rails and finally
fasten it firmly to the pit wall.

Note: The guide rails must not have any axial
play as this would cause noise during pump op­eration.

6. Clean out debris from the pit before lowering the
pump into the pit.

17

7. Fit the guide claw to the discharge 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.

8. 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.

9. 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 pit.
Make sure that the cables are not sharply bent
or pinched.

10. Connect the motor cable and the monitoring ca­ble, if any.

Hookup auto-coupling system, see fig. B,
page 290.

Proceed as follows:

1. Fit the crossbar in the pit.

2. Fit the adapted piece of pipe for the movable part

of the hookup auto-coupling to the pump dis­charge port.

3. Fasten a shackle and a chain to the movable part

of the hookup auto-coupling.

4. Clean out debris from the pit before lowering the

pump.

5. Lower the pump into the pit by means of the

chain fastened to the lifting bracket.

6. 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.

7. 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 pit. Make
sure that the cables are not sharply bent or
pinched.

8. Connect the motor cable and the monitoring ca-

ble, if any.

4.2 Free-standing submerged installation

Pumps for free-standing submerged installation can
stand freely on the bottom of the pit or the like, see
fig. C, page 291, and fig. D, page 292.

In order to facilitate service on the pump, fit a flexible
union or coupling to 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, the union or coupling, non­return valve and isolating valve should be fitted in
the order mentioned, when viewed from the pump.

If the pump is installed in muddy conditions or on un­even ground, it is recommended 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.
It is recommended 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 pit 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.

5. Electrical connection

The electrical connection should be carried out in ac­cordance with local regulations.

The pump must be connected to an exter­nal mains switch with a minimum contact
gap of 3 mm in all poles.

If the pump is protected by means of a mo­tor starter, this starter must be set to the
current consumption of the pump. The cur­rent consumption is stated on the pump
nameplate.

The explosion protection classification of
the pump is CE II 2 G, EEx d IIB T4.
The classification of the installation site
must in each individual case be approved
by the local fire-fighting authorities.

Control boxes and pump controllers must
not be installed in potentially explosive en­vironments.

Make sure that all protective equipment
has been connected correctly.

Float switches used in explosive environ­ments must be approved for this applica­tion. They must be connected to the
Grundfos LC/D 108 pump controller via the
intrinsically safe LC-Ex4 barrier to ensure
a safe circuit.

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 electricity supply
available at the installation site.

All pumps are supplied with 10 metres of cable and a
free cable end.

The pump must be connected to

• a control box with motor starter, e.g. Grundfos

CU 100 control box, or

• a Grundfos LC/D 107, LC/D 108 or LC/D 110

pump controller.

18

See fig. 4 or 5 and the installation and operating in­structions for the selected control box or pump con­troller.

LN

PE

PE

123 645

T3T2 T1

150˚C160˚C

1

Fig. 4 Wiring diagram for single-phase pumps

L1PEL2 L3

PE

123 645

T3T2 T1

150˚C170˚C

3

Fig. 5 Wiring diagram for three-phase pumps

5.1 CU 100 control box

The CU 100 control box incorporates a motor starter
and is available with level switch and cable.

Single-phase pumps: An operating capacitor must
be connected to the control box.

For capacitor size, see the table:

Pump type

DP and EF 30 450

The difference in level between start and stop can be
adjusted by changing the free cable length.

Large difference in level: Long free cable.
Small difference in level: Short free cable.

• To prevent air intake and vibrations, the stop
level switch must be fitted 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.

The CU 100 control box must not be used
for Ex applications.
See section 5.2 Pump controllers.

Cd, operating capacitor

[µF] [V]

•The start level switch should be installed 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 pit.

Note: Both points must be observed.

TM02 5587 4302TM02 5588 3602

Fig. 6 Start and stop levels

5.2 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 level pickups.

• LC 108 and LCD 108 with float switches.

• LC 110 and LCD 110 with electrodes.
In the following description, “level switches” can be

level pickups, 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, the following
points should be observed:

• To prevent air intake and vibrations, the stop
level switch must be fitted 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.

•The start level switch should be installed 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 pit.

Max.

Min.

TM02 7429 3403

19

• The high-level alarm switch, if installed, should

always be installed 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 pit.

For further settings, see the installation and operat­ing instructions for the pump controller selected.

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.

Stop the pump when the liquid level
reaches the upper edge of the clamp on
the pump.

Float switches used in explosive environ­ments must be approved for this applica­tion. They must be connected to the
Grundfos LC/D 108 pump controller via the
intrinsically safe LC-Ex4 barrier to ensure
a safe circuit.

5.3 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.

Note: This thermal switch must be used for all
pumps.

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).

After thermal cutout, explosion-proof
pumps must be restarted manually.
The thermal switch (circuit 2) must be
used for manual restarting of these
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.

The pump must not be started if a poten­tially explosive atmosphere is present in
the pit.

Proceed as follows:

1. Remove the fuses and check whether the impel-

ler can rotate freely. Turn the impeller by hand.

2. Check the condition of the oil in the oil chamber.

See also section 7.5 Oil change.

3. Check whether the monitoring units, if used, are

operating satisfactorily.

4. Check the setting of the level pickups, float

switches or electrodes.

5. Open the isolating valves, if fitted.

6. Lower the pump into the liquid and insert the

fuses.

7. Check whether the system has been filled with

liquid and vented. The pump is self-venting.

8. Start the pump.
Note: In case of abnormal noise or vibrations from

the pump or other pump or supply failures, stop the
pump immediately. Do not attempt to restart the
pump before the cause of the fault has been found
and the fault corrected.

After one week of operation after replacement of the
the shaft seal, the condition of the oil in the chamber
should be checked. See section 7. Maintenance and
service for procedure.

6.1 Operating modes

The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).

• S3, intermittent operation:

The operating mode is S3 - 40% - 10 minutes
(S3 - 40% = Operating for 4 minutes, stopped for
6 minutes).
In this operating mode, the pump is partly sub­merged in the pumped liquid, i.e. the liquid level
reaches the middle of the motor.
The pump is allowed to operate 40% of the duty
cycle (ts) and it must be stopped for the remaining
60% to cool, see fig. 7.

P

The separate motor starter/control box
must not be installed in potentially explo­sive environments.

6. Start-up

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 electricity supply
cannot be accidentally switched on.

Make sure that all protective equipment
has been connected correctly.

The pump must not run dry.

20

40% 60%

Fig. 7 S3 operation

ts

TM02 7776 4003

t

• S1, continuous operation:

In this operating mode, the pump can operate
continuously without having to be stopped for
cooling. Being completely submerged, the pump
is sufficiently cooled by the surrounding liquid, see
fig. 8.

P

t

Fig. 8 S1 operation

TM02 7775 4003

6.2 Direction of rotation

Note: The pump may be started for a very short pe-

riod without being submerged for checking of the di­rection of rotation.

All single-phase pumps are factory-wired for the
correct direction of rotation.

Before starting up three-phase pumps, the direction
of rotation must be checked.

An arrow on the side of the stator housing indicates
the correct direction of rotation.

The pump should rotate 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 incoming supply wires, see fig. 4 or 5.

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 measure the flow or the dis­charge pressure.

2. Stop the pump and interchange any two of the in­coming supply wires.

3. Restart the pump and measure 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 pit.

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. 9. If not, interchange any two of the incoming
supply wires.

Fig. 9 Jerk direction

7. Maintenance and service

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 electricity supply
cannot be accidentally switched on.

All rotating parts must have stopped
moving.

Except for service on the hydraulic part, all
other service work must be carried out by

Grundfos or an authorized service
workshop.

Before carrying out maintenance and service, it must
be ensured that the pump has been thoroughly
flushed with clean water. Rinse the pump parts in
water after dismantling.

When slackening 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.

TM02 7434 3403

21

7.1 Inspection intervals

Pumps running normal operation should be checked
at least once a year, but at least after 3000 operating
hours. If the pumped liquid is very muddy or sandy,
check the pump at shorter intervals.

The following points should be checked:

• 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.
The oil becomes greyish white like milk if it con­tains water. This may be the result of a defective
shaft seal. The oil should be changed after
3000 operating hours or once a year.
Use Shell Ondina 917 oil or similar type.
See sections 7.5 Oil change and 7.6 Service kits.

Note: Used oil must be disposed of in accordance
with local regulations.
The table states how much oil the pumps must
have in the oil chamber:

Pump type

DP and EF pumps

up to 1.5 kW

DP pumps, 2.6 kW 0.42

• Cable entry

Make sure that the cable entry is watertight and
that the cables are not sharply bent and/or
pinched.
See section 7.6 Service kits.

• Pump parts

Check the impeller, pump housing, etc. for possi­ble wear. Replace defective parts.
See section 7.6 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 an authorized service workshop.

Quantity of oil

in oil chamber[l]

0.17

7.2 Adjustment of impeller clearance

For position numbers, see page 300, 301 or 302.
Procedure:

1. DP pumps only: Slacken and remove the screws

(pos. 188c) holding the suction strainer (pos. 84).
Remove the strainer.

2. Slacken the locking screws (pos. 188b).

3. Slacken the adjusting screws (pos. 189) and
push the wear plate until it touches the impeller.

4. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then slacken all
the adjusting screws about half a turn.

Note: The impeller must be able to rotate freely
without touching the wear plate.

5. Tighten the locking screws.

22

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 7.3 Cleaning the pump housing.

Fig. 10 Pump viewed from suction port

7.3 Cleaning the pump housing

For position numbers, see page 300, 301 or 302.
To clean the pump housing, proceed as follows:

Dismantling:

1. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.

2. Lift the motor part out of the pump housing
(pos. 50). The impeller is removed together with
the motor part.

3. 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 7.4 Checking/replacing the shaft
seal.

7.4 Checking/replacing the shaft seal

To make sure that the shaft seal is intact, the oil
should be checked.

If the oil is greyish white like milk or contains a large
quantity of water, the shaft seal should be replaced
as the primary part of the seal is worn. If the seal is
still used, the motor will be damaged within a short
time.

If the oil is clean, it can be reused. See also section

7. Maintenance and service.

For position numbers, see page 300, 301 or 302.
To check the shaft seal, proceed as follows:

1. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.

2. Lift the motor part out of the pump housing
(pos. 50). The impeller is removed together with
the motor part.

TM02 7431 3403

3. Remove the screw (pos. 188a) from the shaft
end.

4. Remove the impeller (pos. 49) from the shaft.

5. Drain the oil from the oil chamber.
See section 7.5 Oil change.
Note: Used oil must be disposed of in accord­ance with local regulations.

When slackening 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.

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 according to the lever principle using the two
dismounting holes in the shaft seal carrier
(pos. 58) and two screwdrivers.

8. Check the condition of the shaft where the sec­ondary seal of the shaft seal touches the shaft.
The bush (pos. 103) fitted to the shaft must be in­tact. If it is worn and must be replaced, the pump
must be checked by Grundfos or an authorized
service workshop.

If the shaft is intact, proceed as follows:

1. Check/clean the oil chamber.

2. Lubricate the faces in contact with the shaft seal
with oil (pos. 105a) (O-rings and shaft).

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. Fit the pump housing (pos. 50).

8. Fit and tighten the clamp (pos. 92).

9. Fill the oil chamber with oil, see section

7.5 Oil change.

For adjustment of impeller clearance, see section

7.2.

7.5 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 7.4 Checking/replacing
the shaft seal.

Draining of oil:

When slackening 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.

1. Slacken 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.
Note: Used oil must be disposed of in accord­ance with local regulations.

Oil filling, pump lying down, see fig. 11:

1. Place the pump in such a position that it is lying
on the stator housing and the discharge flange
and that the oil screws are 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 7.1 Inspection inter-
vals.

3. Fit both oil screws using the packing material in­cluded in the kit.
See section 7.6 Service kits.

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 7.1 Inspection inter-
vals.

3. Fit both oil screws using the packing material in­cluded in the kit.
See section 7.6 Service kits.

Oil filling

Oil level

Fig. 11 Oil filling holes

TM02 7433 3403

23

7.6 Service kits

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 electricity supply cannot be accidentally switched
on.

All rotating parts must have stopped moving.

The following service kits are available for all pumps.
The kits can be ordered as required:

Service kit Contents Pump type Order number

Shaft seal kit Shaft seal complete

O-ring kit O-rings and gaskets for oil screws

Impeller

Oil

Note: A possible replacement of the cable must be
carried out by Grundfos or an authorized service
workshop.

Impeller complete with adjusting screw, shaft
screw and key

1 litre of oil, type Shell Ondina 917.
See section 7. Maintenance and service for
required quantity in oil chamber.

7.7 Contaminated pumps

Note: If a pump has been used for a liquid which is

injurious to health or toxic, the pump will be classi­fied as contaminated.

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.

Before a pump is returned, it must be cleaned in the
best possible way.

0.6 kW - 1.5 kW 96106536

2.6 kW 96076123

0.6 kW - 1.5 kW 96115107

2.6 kW 96115108

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

All types 96076171

24

8. Fault finding chart

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 electricity supply cannot be accidentally
switched on.

All rotating parts must have stopped moving.

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 starter trips out
immediately.
Caution: Do not start again!

2. Pump operates, but motor
starter trips out after a short
while.

3. Pump operates at below­standard performance and
power consumption.

4. Pump operates, but gives no
liquid.

a) Supply failure; short-circuit;

earth-leakage fault in cable or
motor winding.

b) Fuses blow due to use of wrong

type of fuse.
c) Impeller blocked by impurities. Clean the impeller.
d) Level pickup, float switch or

electrode out of adjustment or

defective.
a) Low setting of thermal relay in

motor starter.
b) Increased current consumption

due to large voltage drop.

c) Impeller blocked by impurities.

Increased current consumption

in all three phases.
d) Adjustment of impeller clearance

incorrect.
a) Impeller blocked by impurities. Clean the impeller.
b) Wrong direction of rotation.

a) Discharge valve closed or

blocked.
b) Non-return valve blocked. Clean the non-return valve.

Have the cable and motor checked
and repaired by a qualified electri­cian.

Install fuses of the correct type.

Check the level pickups, float
switches or electrodes.

Set the relay in accordance with the
specifications on the nameplate.

Measure the voltage between two
motor phases.
Tolerance: –10%/+6%.

Clean the impeller.

Readjust the impeller, see section

7.2, fig. 10.

Check the direction of rotation and
possibly interchange any two of the
incoming supply wires, see section

6.2 Direction of rotation.
Check the discharge valve and pos-

sibly open and/or clean.

Vent the pump.c) Air in pump.

9. Disposal

Disposal of this product or parts of it must be carried
out according to the following guidelines:

1. Use the local public or private waste collection
service.

2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz­ardous materials from it to your nearest Grundfos
company or service workshop.

25

10. Technical data and
operating conditions

Supply voltage

• 1 x 230 V –10%/+6%, 50 Hz.

• 3 x 230 V –10%/+6%, 50 Hz.

• 3 x 400 V –10%/+6%, 50 Hz.

Winding resistances

Motor size Winding resistance *

Single-phase

Starting winding Main winding

0.6 kW

4.5 Ω 2.75 Ω0.9 kW

1.1 kW

Three-phase

3 x 230 V 3 x 400 V

0.6 kW

0.9 kW

1.1 kW

1.5 kW

2.6 kW 3.4 Ω 4.56 Ω

* The table values do not include the cable.

Resistance in cables: 2 x 10 m, approx. 0.28 Ω.

Enclosure class

IP 68. According to IEC 60 529.

Ex protection

CE II 2 G, EEx d IIB T4. According to EN 50 018.

Insulation class

F (155°C).

pH value

Pumps in permanent installations can cope with
pH values ranging from 4 to 10.

Liquid temperature

0°C to +40°C.
For short periods up to +60°C.

Explosion-proof pumps must never pump
liquids with a temperature higher than
40°C.

Density of pumped liquid

Maximum 1100 kg/m³.
In the case of higher values, contact Grundfos.

Installation depth

Maximum 10 metres below liquid level.

6.8 Ω 9.1 Ω

Operation

Maximum 30 starts per hour.
The pumps are designed for intermittent operation.

When completely submerged in the pumped liquid,
the pumps can also operate continuously.

Partly submerged: Intermittent operation (S3 - 40% ­10 minutes).
(S3 - 40% = Operating for 4 minutes, stopped for
6 minutes).

Completely submerged: Continuous operation (S1).

Pump curves

Pump curves are available via internet
www.grundfos.com.

The curves are to be considered as a guide. They
must not be used as guarantee curves.

Test curves for the supplied pump are available on
request.

Sound pressure level

The sound pressure level of the pumps is lower than
the limiting values stated in the EC Council Directive
98/37/EC relating to machinery.

26

Subject to alterations.