Grundfos S Series, S1 Series, S2 Series, S3 Series, ST Series Installation And Operating Instructions Manual

S pumps, ranges 50-70

S1, S2, S3, ST, SV

7.5 - 155 kW

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

English (GB) Installation and operating instructions

Caution

Note

Note

English (GB)

Original installation and operating instructions.

CONTENTS

1. Symbols used in this document

2. General description

2.1 Applications

2.2 Operating conditions

2.3 Sound pressure level

2.4 Type key

2.5 Nameplate

3. Safety

3.1 Lifting points for submerged and dry vertical
installation (S/C/D)

4. Transportation and storage

5. Installation

5.1 Installation type

5.2 Submerged installation on auto coupling

5.3 Dry installation

5.4 Submerged installation, portable

5.5 Vertical installation in column pipe

5.6 Pump controller

5.7 Galvanic separation

5.8 IO 113

5.9 Thermal switches

5.10 Moisture switches

5.11 Thermistors

5.12 Pt100 temperature sensor

6. Water-in-oil (WIO) sensor

6.1 WIO as accessory

6.2 Fitting the WIO sensor

6.3 Electrical data, WIO sensor

6.4 Sensor signals

7. Electrical connection

7.1 Frequency converter operation

7.2 Cable data

8. Startup

8.1 Checking the direction of rotation

9. Maintenance and service

9.1 Oil check and oil change

9.2 Inspection and adjustment of impeller clearance

9.3 Explosion-proof S pumps, range 50-70

9.4 Contaminated pumps

10. Fault finding

11. Di spo sal

Warning
Prior to installation, read these installation and

operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.

1. Symbols used in this document

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
The surface of the product may be so hot that

it may cause burns or personal injury.

Page

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16
17
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18

Warnin g
These instructions must be observed for

explosion-proof pumps. We recommend that you
also follow these instructions for standard

2

2

2
3
3
4
5

6

6

6

7

7

2. General description

8

This booklet includes instructions for installation, operation and

8

maintenance of Grundfos submersible sewage and wastewater

9

S pumps, range 50-70, fitted with motors of 7.5 to 160 kW.

9

The booklet also includes specific instructions for the explosion-

9

proof pumps.

9
9

pumps.

Warnin g
The sound pressure level is so high that hearing

protection must be used.

If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.

Notes or instructions that make the job easier
and ensure safe operation.

Special conditions for safe use of S pumps,
range 50-70 Ex:

1. Make sure the moisture switches and thermal
switches are connected in two separate circuits
and have separate alarm outputs (motor stop) in
case of high humidity or high temperature in the
motor.

2. Bolts used for replacement must be class A4-80
or A2-80 according to EN/ISO 3506-1.

3. The flame path gaps of the motor are specified by
the manufacturer and are narrower than
standard.
Note: In case of repairs always use original
service parts from the manufacturer as this
ensures correct dimensions of flame path gaps.

4. During operation the cooling jacket, when fitted,
must be filled with pumped liquid. The level of
pumped liquid must be controlled by level
switches connected to the motor control circuit.

5. The minimum level depends on the installation
type and is specified in these installation and
operating instructions.

6. Make sure the permanently attached cable is
suitably mechanically protected and terminated in
a suitable terminal board.

2.1 Applications

S pumps, range 50-70 are designed for the pumping of sewage
and wastewater in a wide range of municipal, private and
industrial applications.

Depending on the installation type, the pumps can be used for
submerged or dry, horizontal or vertical installation.

Maximum solids size: 80-145 mm depending on range.

2.1.1 Potentially explosive environments

Use the explosion-proof S pumps, range 50-70, in potentially
explosive environments. See section 2.5.1 Ex certification and

classification.

The explosion classification of the pump is Ex bc
d IIB T3. The installation must be approved by the
local authorities in each individual case.

2

2.2 Operating conditions

Installation type S and C

S1 operation and Ex
pumps, installation
type S

Installation type C

2.2.1 pH value

All pumps can be used for pumping liquids with a pH value
between 4 and 10.

2.2.2 Liquid temperature

0 °C to +40 °C.

2.2.3 Ambient temperature

-20 °C to +40 °C.

2.2.4 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.

2.2.5 Flow velocity

It is advisable to keep a minimum flow velocity to avoid
sedimentations in the piping system.

Recommended velocities

In vertical pipes: 0.7 m/s
In horizontal pipes: 1.0 m/s

2.2.6 Level of pumped liquid

For a submerged pump, installation type C, the lowest stop level
must always be above the pump housing.

Warnin g
Dry-running is not allowed.
The level of pumped liquid must be controlled by

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.

To ensure adequate cooling of the motor during operation, the
following minimum requirements must be met:

• Installation type S
For S1 operation (continuous operation), the pump must
always be covered by the pumped liquid to the top of the
motor.
For S3 operation (intermittent operation), the pump must
always be covered by the pumped liquid to the middle of the
motor.

Warnin g
Installation type S pumps must always be fully

submerged in the pumped liquid to be Ex
protected.

• Installation type C
The pump housing must always be covered by the pumped
liquid.

English (GB)

Installation

type

S

C

D

ST

H

Description Accessories

Sewage pump without
cooling jacket for
submerged installation on
auto coupling.

Sewage pump with cooling
jacket for submerged
installation on auto
coupling.

Sewage pump with cooling
jacket for dry vertical
installation.

Sewage pump with or
without cooling jacket for
vertical installation in
column pipe.

Sewage pump with cooling
jacket for dry horizontal
installation.

Auto coupling

Auto coupling

Range 50, 54, 58
and 62: Base stand
for vertical
installation.

Range 66 and 70:
Base plate for
vertical installation.

Seat ring for vertical
installation in
column pipe.

Base stand for
horizontal
installation.

Fig. 1 Liquid level

• Installation type D and H
No special requirements.

• Pump type ST
The liquid level must be at least 350 mm above the pump inlet.
See fig. 9.

2.2.7 Operating mode

The pumps are designed for continuous operation or for
intermittent operation with the maximum number of starts per
hour stated in the table below:

S pump, range Starts per hour

50
54
58

62
66
70

2.2.8 Enclosure class

IEC IP68.

20

15

2.3 Sound pressure level

Warning
Depending on the installation type the sound

pressure level of the pump can be higher than
70 dB(A).

When working nearby such an installation in
operation, hearing protection must be used.

TM02 4000 0309

3

2.4 Type key

English (GB)

All S pumps, range 50-70, described in this booklet are identified by the type code stated in the confirmation of order and other
documentation supplied with the pump.

Please note that the pump type described in this booklet is not necessarily available in all variants.

Code Example S 1 .100 .100 .55 4 .50 M .S .205 .G .N .D .5 11 .Z

Pump type

S

Grundfos sewage and wastewater pump

ST

Multi-channel impeller pump installed in column pipe

Impeller type

1

Single-channel

2

Two-channel

3

Three-channel

V

SuperVortex

Pump passage

Maximum solids size [mm]

Pump discharge

Nominal diameter of pump discharge port [mm]

Output power P2

Code number from type designation / 10 [kW]

Number of poles

2

2-pole motor

4

4-pole motor

6

6-pole motor

8

8-pole motor

10

10-pole motor

12

12-pole motor

Pump range

50

Range 50

54

Range 54

58

Range 58

62

Range 62

66

Range 66

70

Range 70

Pressure version

S

Super high

H

High

M

Middle

L

Low

E

Extra low

F

Super low

Installation type

S

Submersible installation without cooling jacket

C

Submersible installation with cooling jacket

D

Dry, vertical installation

H

Dry, horizontal installation

Actual impeller diameter [mm]

Material code for impeller, pump- and motor housing

G

Cast iron impeller, pump housing and motor housing

Q

Stainless steel impeller, DIN W.-Nr. 1.4408

S

Stainless steel impeller and pump housing, DIN W.-Nr. 1.4408

R

Stainless steel impeller, pump housing and motor housing, DIN W.-Nr. 1.4408

Pump version

N

Non-ex pump

Ex

Pump with explosion-proof motor

Sensor version

B

S pump with built-in SM 113 module. PTC sensors are connected directly to IO 113 or other PTC relay.

C

Not in use

D

S pump without built-in SM 113 module

Frequency:

5

50 Hz

6

60 Hz

Voltage code and connection:

50 Hz:

11

3 x 400 / 690 V Y/D

13

3 x 415 / (719) V Y/D

60 Hz:

11

3 x 460 / (797) V Y/D

15

3 x 380 / 660 V Y/D

Z Custom-built products

4

2.5 Nameplate

1

2

3

4

5

6

7

8

9

10

11

12

23

13

14

15

16

17
18

19

20

21
22

12

22

23

All pumps can be identified by means of the nameplate on the
motor top cover. See fig. 2. If the nameplate is missing or
damaged, the pump can be identified by the serial number
stamped under the nameplate.

2.5.1 Ex certification and classification

Direct drive, 50 or 60 Hz: CE 1180 II2 G Ex bc d IIB T4.
Frequency converter drive: CE 1180 II2 G Ex bc d IIB T3.
Explosion-proof pumps have been approved by Baseefa (2001)

Ltd. in conformity with the essential health and safety
requirements relating to the design and construction of equipment
intended for use in potentially explosive atmospheres given in
Annex II to the Council Directive 94/9/EC (ATEX).

The certified pumps (Ex pumps) are supplied with an approval
plate fixed in the visible place close to the nameplate.

Fig. 3 shows the approval plates for the pumps equipped
optionally with the motors classified to T3 or T4 temperature
class.

English (GB)

TM06 1781 2514 - TM06 0370 5313

Fig. 2 Pump nameplate

Pos. Description

1 Type designation
2 SAP code
3 Serial number
4 Maximum head (m)
5 Maximum installation depth (m)
6 Number of phases
7 Voltage, delta connection
8 Voltage, star connection

9 Rated power input
10 Cos φ, 1/1 load
11 Production code (YY/WW)
12 Production number
13 Maximum liquid temperature (°C)
14 Maximum flow rate (l/s)
15 Enclosure class
16 Frequency (Hz)
17 Rated speed
18 Current, delta connection
19 Current, star connection
20 Rated power output
21 Insulation class
22 Net weight (kg)
23 Production site

Fig. 3 Approval plates of explosion-proof pumps, T3 and T4

classification

The approval plate gives the following details:

EU ex-symbol

II Equipment group (II = non-mining)
2 Equipment category (high protection)
G Type of explosive atmosphere
CE CE mark
1180 Number of quality assurance notified body
Ex Motor explosion-proof according to European

standard
b Control of ignition sources
c Constructional safety
d Motor withstands explosion pressure
IIB Gas group (ethylene)
T3 Maximum surface temperature of the motor is 200 °C
T4 Maximum surface temperature of the motor is 135 °C
Gb Equipment protection level, zone 1
Baseefa Certificate number
IECEx Certificate number

TM06 1779 2814 - TM06 1780 2814 - TM05 8222 2113 - TM05 8224 2113

5

3. Safety

Range 50 and 54

Range 58, 62, 66 and 70

Front

Middle

Nose

Front

Middle

Caution

English (GB)

Warnin g
Pump installation in tanks must be carried out by

specially trained persons.

Warnin g
Persons must not enter the installation area when

the atmosphere is explosive.

Warnin g
It must be possible to lock the mains switch in

position 0. Type and requirements as specified in
EN 60204-1, 5.3.2.

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

Tanks for submersible sewage and wastewater pumps 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 pump must be carried out under strict
observance of the hygiene regulations in force.

Warnin g
For some installation types, the surface

temperature may be up to 90 °C.

Warnin g
Make sure that the lifting eye bolts are 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
Make sure the rated lifting capacity of the lifting

equipment (lifting chain etc.) is adequate before
attempting to lift the pump.

The rated lifting capacity of the lifting equipment
is marked in the identification label. The weight
of the pump is marked in the pump nameplate.

3.1 Lifting points for submerged and dry vertical installation (S/C/D)

When lifting the pump, it is important to use the right lifting point
to keep the pump balanced. S pumps model S/C/D are equipped
with a bracket with lifting points ensuring that the pump can be
lifted in a safe manner. See fig. 4 and table below to find the
correct lifting point.

Discharge
flange size

DN80 MiddleMiddle---­DN100 MiddleMiddle---­DN125 Middle Middle Middle Middle - ­DN200 Front Front Front Middle Middle Middle
DN250 - Front - - Middle Middle
DN300 - - Front Middle Middle Middle
DN500 - - - - Nose Front
DN600 - - - - Nose Front

50 54 58 62 66 70

Pump range

4. Transportation and storage

The pump is supplied from the factory in proper packing in which
it should remain until it is to be installed.

Make sure that the pump cannot roll or fall over.
All lifting equipment must be rated for the purpose and checked

for damage before any attempt to lift the pump. The lifting
equipment rating must under no circumstances be exceeded.
The pump weight is stated on the pump nameplate.

Warning
Always lift the pump by its lifting bracket or by

means of a fork-lift truck, never by means of the
motor cable or the hose/pipe.

Do not remove the insulation from the free end of
the supply cable until the electrical connection is
to be made. Whether insulated or not, the free
cable end must never be exposed to moisture or
water. Non-compliance with this may cause
damage to the motor.

For long periods of storage, the pump must be protected against
moisture and heat.

Storage temperature: -30 °C to +60 °C.

Warning
If the pump is stored for more than one year or it

will be a long time before it is put into operation
after the installation, the impeller must be turned
at least once a month.

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 condition of the shaft
seals and the cable entry.

Fig. 4 Lifting points

6

TM04 7173 1710

5. Installation

Caution

Caution

Warnin g
During installation, always support the pump by

means of lifting chains or place it in horizontal
position to secure stability.

Warnin g
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.

The extra nameplate supplied with the pump should be fixed at
the installation site.

All safety regulations must be observed at the installation site, for
instance the use of blowers for fresh-air supply to the tank.

Warnin g
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.
Make sure that the power supply cannot be
accidentally switched on.

Prior to installation, check the oil level in the oil chamber.
See section 9.1 Oil check and oil change.

5.1 Installation type

S pumps, range 50-70 are designed for various installation types.
Figures 5 to 9 show the possible installation types.

Permanent installation in tank

The pump can easily be pulled out and lowered into the tank by
means of the guide rails. The liquid level can be set lower for type
C than for type S. See fig. 1.

Installation type D

English (GB)

TM02 4001 4601 - TM02 4023 4701

Fig. 6 Dry, vertical installation with base stand (left) and base

plate on two concrete pedestals (right)

Permanent installation in a pump room

The pump is bolted to the suction and discharge pipes by means
of flange connections. Pumps with DN 500 or DN 600 flange are
to be installed on a concrete foundation (see the above figure to
the right).

Installation type S and C

Installation type S and C

Fig. 5 Submerged installation on auto coupling

Avoid pipe tension at flanges and bolts.

The free end of the cable must not be submerged
as water may penetrate through the cable into the
motor.

TM02 4002 4601

Fig. 7 Submerged, temporary installation

Temporary installation in a tank

The liquid level can be set lower for type C than for type S.
See fig. 1.

Installation type H

TM02 4000 0309

TM02 4003 4601

Fig. 8 Dry horizontal installation with base stand and bracket

7

Permanent installation in a pump room

Note

Note

Note

Note

Caution

Reducer of the eccentric type

 0.2 m

English (GB)

The pump is bolted to the suction and discharge pipes by means
of flange connections.

Pump type ST

Fig. 9 Vertical column pipe installation

Vertical column pipe installation in steel pipe or concrete shaft.

5.2 Submerged installation on auto coupling

Pumps for permanent installation can be installed on a stationary
auto coupling and operated completely or partially submerged in
the pumped liquid.

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.

Do not use elastic elements or bellows in the
pipework; these elements should never be used
as a means to align the pipework.

In some installations, a plinth is required beneath
the auto coupling to ensure correct installation of
the pump. This should be considered during the
design of the installation.

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 pipe in accordance with the generally

accepted procedures and without exposing the pipe 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.

Insert the expansion dowels into the guide rails. Fasten the
guide rail bracket on the inside of the tank. Tighten the bolts in
the expansion dowels.

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

the tank.

7. Fit the guide claw to the pump.

8. Slide the guide claw of the pump 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 control cable, if any.

The free end of the cable must not be submerged,
as water may penetrate through the cable into the
motor.

5.3 Dry installation

Pumps in dry installation are installed permanently in a pump
room.

The pump motor is enclosed and watertight and will not be
damaged if the installation site is flooded with water.

TM02 2494 4401

1. Mark and drill mounting holes in the concrete floor/concrete
foundation.

2. Fit the bracket or base stand to the pump.

3. Fasten the pump with expansion bolts.

4. Check that the pump is vertical/horizontal.

In order to facilitate service on the pump, we recommend to use
isolating valves on either side of the pump.

5. Fit the suction and discharge pipes and isolating valves, if
used, and ensure that the pump is not stressed by the
pipework.

6. 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.

7. Connect the motor cable and the control cable, if any.

We recommend to use a reducer between the
suction pipe and the pump in horizontal
installations. The reducer must be of the
eccentric type and must be installed so that the
straight edge is pointing upwards. In this way,
the accumulation of air in the suction pipe is
avoided and the risk of disturbance of operation
is eliminated. See fig. 10.

Fig. 10 Eccentric reducer

TM02 2396 4201

8

5.4 Submerged installation, portable

1. Fit the ring stand to the pump suction flange.

2. Fit a 90 ° elbow to the pump discharge port and connect the
discharge pipe/hose.
If a hose is used, make sure that the hose does not buckle
and that the inside diameter matches that of the discharge
port.

3. 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.

4. 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.

5. 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.

6. Connect the motor cable and the control cable, if any.

5.5 Vertical installation in column pipe

1. Weld the ring supplied with the pump onto the lower opening
of the steel column pipe or concrete it into place at the lower
opening of the concrete column pipe.

2. Fasten a chain to the lifting bracket and uncoil the supply
cable.

3. Lower the pump into place in the column pipe. Make sure that
the O-ring seal is positioned correctly in the groove on the
outside of the pump housing. Three guide pins on the ring will
guide the pump into the right position and prevent it from
turning in the seat when running.

4. 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.

5. 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.

6. Connect the motor cable and the control cable, if any.

5.6 Pump controller

S pumps, range 50-70 can be connected to a separate Grundfos
pump controller for level control, which is available as an
accessory:

• type LC for one-pump installations

• type LCD for two-pump installations.

Depending on application, different types of level control
equipment can be used.

The LC controller is fitted with two or three level switches:
Two for start and 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:

1. To prevent air intake and vibrations in submerged pumps, the
stop level switch must be fitted in such a way that the pump is
stopped before the liquid level is lowered below the top of the
pump housing.
As a principal rule for pumps in dry installation, the lowest
stop level must be at least 20 cm above the opening of the
suction pipe. See fig. 10.

2. 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 tank.

3. The high-level alarm switch, if installed, should always be
installed about 10 cm above the start level switch; however,
alarm must always be given before the liquid level reaches the
inlet pipe to the tank.

Warnin g
The pump controller must not be installed in

potentially explosive atmospheres.

Warning
Pumps installed in potentially explosive

atmosphere must always be filled with the
pumped liquid.

An additional level switch must be installed to
ensure that the pump is stopped in case the stop
level switch is not operating.

5.7 Galvanic separation

Double-insulated sensors for all measurements of high voltages
ensure the electrical safety. Furthermore, there is a galvanic
separation inside the IO 113.

5.8 IO 113

The IO 113 forms interface between a Grundfos sewage and
wastewater pump with analogue and digital sensors and the
pump controller. The most important sensor data are indicated on
the front panel.

One pump can be connected to an IO 113 module.
Together with the sensors, the IO 113 forms a galvanic separation

between the motor voltage in the pump and the controller
connected.

5.8.1 Measurement of insulation resistance

The IO 113 measures the insulation resistance between a stator
winding and earth:

• Resistance above 10 MΩ = ok.

• Resistance between 10 MΩ and 1 MΩ = warning.

• Resistance below 1 MΩ = alarm.

English (GB)

9

5.9 Thermal switches

Caution

Caution

Caution



Note



English (GB)

Three bimetallic thermal switches are built into the stator
windings, and a contact will open in case of overtemperature, i.e.
150 °C.

The supply voltage to the thermal switches must be 12-230 VAC.
The thermal switches are connected to the control cable, and

must be connected to the safety circuit of the separate pump
controller. See section 7. Electrical connection.

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.

Warnin g
The installer/user must install an automatic

circuit breaker which disconnects the power
supply in case the thermal switches or the
moisture switches are not operating.

5.10 Moisture switches

Non-explosion-proof pumps have one moisture switch, which is
fitted in the chamber below the motor top cover.

Explosion-proof pumps have two moisture switches connected in
series.

Ranges 50-58 and 66-70 explosion-proof pumps have two
moisture switches, one below the motor top cover and one in the
stator housing in the bottom of the motor.

Range 62 has both moisture switches placed below the motor top
cover.

Moisture switches and thermal switches are motor protection
devices which protect the motor from damage due to moisture or
overheating. The moisture switches are non-reversing and must
be replaced after use.

The moisture switches and thermal switches are connected in two
separate circuits and to the control cable. See 7. Electrical

connection. They are also to be connected to the safety circuit of

the separate pump controller.

The safety circuit for the moisture switch must
ensure that the pump cannot start if the moisture
switch becomes wet due to water ingress.

5.12 Pt100 temperature sensor

The Pt100 temperature sensor is available as an accessory or as
an FPV (Factory Product Variant) option.

The Pt100 sensor is primarily used for the monitoring of bearing
temperature, but it can also be used in the stator.

The bearing temperature monitoring is only
available as an option. For range 50 and 54 it is
only available for monitoring the lower bearing
temperature in explosion-proof pumps.

The sensor resistance is

• 100 Ω at 0 °C

• 138.5 Ω at 100 °C

• approx. 108 Ω at room temperature.

The following temperature limits are used:

• 90 °C: alarm for bearing temperature

• 130 °C: pump stop caused by high bearing temperature

• 150 °C: pump stop caused by high stator temperature.

At room temperature, the thermistor resistance is approx. 100 Ω.

Warning
In case of overheating caused by wear, lack of

lubricant etc., the Pt100 sensor trips an alarm and
disconnects the power supply at a preset
temperature. Max. acceptable alarm temperature
in bearing sensors is 100 °C for the lower bearing
(shaft end) and 120 °C for the upper bearing
(range 58, 62, 66 and 70 only).

5.12.1 Checking after installation of pump

1. Using a multimeter, check whether the resistance at room
temperature is approx. 108 Ω.

2. Using a multimeter, check whether the insulation between
circuit and stator housing is outside the scale
(not measurable ).

3. Carry out similar measurements at the end of the supply
cable.

4. During pump check, the Pt100 sensor must be connected to a
recording device.

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.

5.11 Thermistors

Thermistors are available as an option.
The thermistors can be used as motor protection devices to

monitor stator temperature instead of thermal switches and must
be connected to the thermistor relay in the control cabinet.

5.11.1 Checking after installation of pump

1. Using a multimeter, check whether the circuit resistance is
< 150 Ω/thermistor.

2. Using a multimeter, check whether the insulation between
circuit and stator housing is outside the scale
(not measurable ).

3. Carry out similar measurements at the end of the supply
cable.

10

6. Water-in-oil (WIO) sensor

Note

Caution

Note

6.3 Electrical data, WIO sensor

6.1 WIO as accessory

Warnin g
Lack of oil may cause overheating and damage of

the mechanical seals. The WIO sensor in the oil
chamber will trip the alarm if the oil quality is
poor or there is not enough oil in the oil chamber.

The WIO sensor is available as an accessory for pumps with
motor sizes of 5.5 to 160 kW.

The sensor measures the water content in the oil chamber.
The sensor consists of a plate capacitor which is immersed in the

oil and measures the electronic circuit, emitting a 4-20 mA
proportional current signal.

6.2 Fitting the WIO sensor

The WIO sensor is to be fitted in the filling hole of the oil chamber
instead of the oil screw.

1. Remove the oil screw.

2. Push the sensor into the oil filling hole.

3. Push the sensor to a suitable depth in the oil chamber without
letting it touch the rotating parts, but so deep that the sensor
is completely covered by the oil. Recommended insertion
depths for different pump types appear from the table below.

4. Screw the sensor bush into the thread for the oil screw.

Vertical installation: Always use the lowest oil
screw hole.

Horizontal installation: Always use the inspection
screw hole.

Input voltage: 12-24 VDC
Output current: 3.4 - 22 mA
Power consumption: 0.6 W
Ambient temperature: 0 to 70 °C

6.4 Sensor signals

4-20 mA =

22 mA =

3.5 mA =

0-20 % water in the oil:
Accuracy better than 2 %.

Warning:
Water content far outside measuring range.

Alarm:
Air in the oil chamber.

The sensor signal is only valid when oil and
water is mixed (when the pump is running).

English (GB)

Before refitting the WIO sensor after oil change,
clean it with white spirit.

L

Fig. 11 Dimensions of WIO sensor

S pumps, range

50 80
54 90
58 100
62 100
66 100
70 100

For more detailed information, see installation instruction for the
WIO sensor (96591899).

Insertion depths

L [mm]

TM03 5531 3806

11

7. Electrical connection

Note

V1 W1U1 PE

V2U2W2

PEL1

M

L3L2

3

Control

Cable

V1 W1U1 PE

V2U2W2

PEL1

M

L3L2

3

Control

Cable

English (GB)

Warnin g
The pump must be connected to an external

mains switch with a contact separation according
to EN 60204-1, 5.3.2.

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

The supply voltage and frequency are marked on the pump
nameplate.

The voltage tolerance at the motor terminals must be within

- 10 %/+ 10 % of the rated voltage.

Make sure that the motor is suitable for the power supply
available at the installation site.

The motor is effectively earthed via the power cable and
pipework. The motor top cover is equipped with connections for
external earthing or an equipotential bonding conductor.

Warnin g
For Ex models in dry installation (version D), we

recommend also to connect an external earthing.

Warnin g
Before installation and the first start-up of the

pump, check the condition of the cable visually to
avoid short circuits.

The pump must be connected to a motor protective circuit
breaker.

The most commonly used start-up methods are direct-on-line
starting (DOL), star-delta starting (Y/D) and soft start. The pump
can even be started via a frequency converter according to the
frequency converter manufacturer’s specifications. The selection
of suitable starting method depends on several considerations on
usage and mains supply conditions.

When using star-delta starting, it is important to
keep switching transient time to a minimum to
avoid high transient torques. We recommend to
use a time relay with a switching time of
maximum 50 ms or according to the starter
manufacturer’s specification s.

The wiring diagrams for direct-on-line starting and star-delta
starting are shown in fig. 12 and fig. 13, respectively.

L1 and L2 are connected in series with the thermal switches and
the moisture switches.

TM05 1638 3311TM05 1639 3311

Fig. 12 Direct-on-line starting

Fig. 13 Star-delta starting

7.1 Frequency converter operation

In principle, all three-phase motors can be connected to a
frequency converter.

However, frequency converter operation will often expose the
motor insulation system to a heavier load and cause the motor to
be more noisy than usual due to eddy currents caused by voltage
peaks.

In addition, large motors driven via a frequency converter will be
loaded by bearing currents.

For frequency converter operation, please observe the following
information:

Requirements must be fulfilled.
Recommendations ought to be fulfilled.
Consequences should be considered.

7.1.1 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 the
motor terminals. The cable influence has not been taken into
account. See the frequency converter data sheet regarding the
actual values and the cable influence on the peak voltage and
dU/dt.

12

Maximum repetitive peak

voltage

[V]

Maximum dU/dt U

[V/μ sec.]

400 V

N

850 2000

• If the pump is an Ex-approved pump, check if the Ex certificate
of the specific pump allows the use of a frequency converter.

• Set the frequency converter U/f ratio according to the motor
data.

• Local regulations/standards must be fulfilled.

7.1.2 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.

7.1.3 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.

7.2 Cable data

Standard H07RN-F

S

pump,

range

50

54

58

62

66

70

Cable type

[mm

7 x 1.5 14.4 16.4 10
4 x 2.5 16.7 18.7 12

4 x 6 15.7 17.2 11
4 x 6 15.7 17.2 11

4 x 10 20.9 23.4 14

4 x 6 15.7 17.2 11

4 x 10 20.9 23.4 14

4 x 6 15.7 17.2 11
4 x 10 20.9 23.4 14
4 x 16 23.8 26.3 16
4 x 10 20.9 23.4 14
4 x 16 23.8 26.3 16
4 x 25 28.9 31.4 19
4 x 25 28.9 31.4 19
4 x 35 32.5 34.7 22
4 x 50 37.7 40.4 25
4 x 70 42.7 45.4 28

Outer cable diameter

2

]

min. max. [cm]

[mm]

Bending radius

EMC

S

pump,

range

Cable type

[mm

Outer cable diameter

2

]

min. max. [cm]

[mm]

Bending radius

50 3 x 6 13.6 15.2 7.6

54

58

3 x 6 13.6 15.2 7.6

3 x 10 17.8 19.8 9.9

3 x 6 13.6 15.2 7.6

3 x 10 17.8 19.8 9.9

3 x 6 13.6 15.2 7.6

62

3 x 10 17.8 19.8 9.9
3 x 16 20.9 22.9 11.5
3 x 10 17.8 19.8 9.9

66

3 x 16 20.9 22.9 11.5
3 x 35 28.3 31.3 15.7

70

3 x 35 28.3 31.3 15.7
3 x 70 38.7 41.7 20.9

Control cables

Cable type

2

[mm

]

Outer cable diameter

[mm]

Bending radius

min. max. [cm]

7 x 1.5 14.4 16.0 - 16.4 10

10 x 1.5 0.71 (18) 0.79 (20) 4.7 (12)

Warnin g
The top cover of explosion-proof pumps is

provided with an external earth terminal to
ensure the connection to earth. The electrical
installation must include an external connection
from this terminal to earth. The earth conductor
must fulfil all electrical safety regulations in
force.

Cross section of phase

conductor (S) of the

installation

2

[mm

]

Minimum cross section

of earth conductor

[mm

S ≤ 16 S

16 < S ≤ 35 16

S > 35 0.5 *S, max. 70

Warning
Before installation and the first start-up of the

pump, check the condition of the cable visually to
avoid short circuits.

English (GB)

2

]

13

8. Startup

Caution

Note

Caution

English (GB)

Warnin g

Before manual starting or changeover to

automatic control, make sure that no persons are

working on or near the pump.

Warnin g

Before the first start-up and after a long standstill

period, make sure that the pump has been filled

with pumped liquid.

In dry installed versions the cooling jacket must

always be filled with pumped liquid when

operating. Ensure this by venting before the first

start-up.

Proceed as follows:

1. Remove the fuses or switch off the mains switch.

2. Check the oil level in the oil chamber.

See section 9.1 Oil check and oil change.

3. Check whether the impeller can rotate freely.

4. Check whether the monitoring units, if used, are operating
satisfactorily.

5. For pumps in submerged installation, make sure that the
pump is submerged in the liquid.

6. For pumps in dry installation, make sure that there is liquid in
the tank from which the supply of liquid comes.

Warnin g
Make sure that the pump has been filled with

pumped liquid.
Pumps in dry installation must be vented via the

vent hole in the pump housing.

7. Open the isolating valves, if fitted.

8. Check whether the system has been filled with liquid and
vented.

9. Check the setting of the level switches.

10. Start the pump and check the pump operation for abnormal
noise or vibrations.

In case of abnormal noise or vibrations from the
pump or other pump or liquid supply failures,
stop the pump immediately. Do not attempt to
restart the pump until the cause of the fault has
been found and the fault corrected.

11. After start-up, the actual pump duty point must be established
as accurately as possible so that it can be checked whether
the operating conditions are as desired.

The pump may only be started for a very short
period without being submerged for checking of
direction of rotation.

The operation of the pump should always take place in
accordance with established routines with scheduled checks of
pump monitoring equipment and accessories (valves, etc.).
Make sure that the pump and equipment settings cannot be
changed by unauthorised persons.

8.1 Checking the direction of rotation

An arrow cast in the pump housing indicates the correct direction
of rotation. The pump must rotate clockwise when seen from the
drive end. Observe the movement of the pump (jerk) when
started. If the pump jerks counter-clockwise, the direction of
rotation is correct.

As an alternative, the direction of rotation can be checked as
follows:

1. Start the pump and check the quantity of liquid or the
discharge pressure.

2. Stop the pump and interchange two of the phases to the
motor.

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.

The pump must only run for a short period when
suspended from a chain.

14

9. Maintenance and service

Note

Caution

Caution

Warnin g
During maintenance and service, including

transportation to service workshop, always
support the pump by means of lifting chains or
place it in horizontal position to secure stability.

Warnin g
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.

Maintenance and service must be carried out by specially trained
persons.

Warnin g
The maintenance and service work on explosion-

proof pumps must be carried out by Grundfos or
a service workshop authorised by Grundfos.

Warnin g
Do not open the pump if the ambient atmosphere

is explosive or dusty.

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.

Pumps running normal operation should be inspected every 2000
operating hours or at least once a year. If the pumped liquid is
very muddy or sandy, the pump should be inspected every 1000
operating hours or every six months.

The following points should be checked:

• Power consumption

• Oil level and oil condition
When the pump is new or after replacement of the shaft seals,
check the oil level and water content after one week of
operation. If there is more than 20 % of water in the oil, the
shaft seal may be defective. See section 9.1 Oil check and oil

change.

Dispose of the oil in accordance with local
regulations.

The oil chamber contains 1.9 to 12.5 litres of oil depending on
pump size. See table below.

Quantity of oil

• Cable entry
Make sure that the cable entry is waterproof and that the
cables are not sharply bent or pinched.

• Impeller clearance
Check the impeller clearance. See section 9.2 Inspection and

adjustment of impeller clearance.

• Pump parts
Check the pump housing, etc. for possible wear.
Replace defective parts.

• 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 an authorised service workshop.

Warning
The ball bearings must be replaced at least every

25,000 operating hours.

Clean the outside of the pump at regular intervals
in order to retain the heat conductivity.

9.1 Oil check and oil change

Change the oil every four years to prevent
oxidation.

Warning
Lack of the lubricant may cause overheating and

damage of the mechanical seals. The WIO sensor
in the oil chamber trips the alarm if the oil quality
is poor or there is no oil in the oil chamber.

The oil chamber has two screws, A and B, for oil drainage, oil
filling and level control.

In pumps with 8- or 10-pole motors of 22-50 kW and pumps with
motors larger than 50 kW, the oil can be changed while the pump
is standing upright. The screw B is used for the indication of the
oil level in the oil chamber. See fig. 14.

English (GB)

S pump,

range

50

54

58

62

66

70

Installation

type

SAll2.6

C-D-H All 1.9

SAll3.5

C-D-H All 2.5

SAll4.6

C-D-H All 3.8

SAll9.0

C-D-H All 7.1

S All 12.5

C-D-H All 9.2

S All 12.4

C-D-H All 9.0

No of poles

Quantity of oil

[l]

TM02 4005 4601TM02 4004 4601

Fig. 14 Oil level, vertical installation

Horizontally installed pumps (installation type H) have a third
screw, C, for oil drainage.

On horizontally installed pumps (installation type H), the oil
screws are always positioned as shown in fig. 15.

Fig. 15 Oil level, horizontal installation

15

Proceed as follows:

Note

Note

0.7

Set screw

Fastening screw Fastening screw

English (GB)

1. Place the pump in such a position that the screw A is pointing
upwards.

Warnin g
When slackening the screw A of the oil chamber,

note that pressure may have built up in the
chamber. Do not remove the screw until the
pressure has been fully relieved.

2. Place a clean container under the pump to collect all the
drained-off oil. Slacken the screw B pointing to the side and
observe the oil level. The drained-off quantity of oil indicates
whether the lower mechanical shaft seal is leaking, which may
be normal.

3. Turn the pump or remove the screw C and allow all the oil to
drain from the chamber into the container. Pour an oil sample
into a glass container and observe the condition of the oil.
Clear oil can be reused. Emulsified oil must be changed and
disposed of.

Used oil must be disposed of in accordance with
local regulations.

Low oil level may indicate that the upper mechanical shaft seal is
defective. Contact an authorised service workshop for further
overhaul of the pump and repair, if required.

4. Fill the oil chamber with oil through the top hole A until the oil
level reaches the hole B. Replace the O-rings with new rings,
insert the screws and tighten securely.

9.2.1 Installation types S and C, all ranges

1. Slacken the set screws by two full turns each.

2. Close the impeller clearance by lightly tightening the fastening
screws diagonally until the impeller touches the pump
housing.

Warning
Do not use too much force when tightening the

fastening screws as this may damage the
bearings. The movement is usual 1 to 3 mm.

3. Slacken the fastening screws to make an 0.7 mm gap under
the heads of the fastening screws. See fig. 16.

4. Tighten the set screws tightly.

5. Tighten the fastening screws diagonally.

Warnin g
Use viscosity grade SAE 10 W 30 or ONDINA

X420.

9.2 Inspection and adjustment of impeller clearance

Warnin g
Check impeller clearance every time service is

carried out to prevent hot surfaces in the
hydraulic parts.

All S1, S2 and S3 pumps have an axial impeller clearance of 0.7
± 0.2 mm.

If the clearance is 1.2 mm or more, adjust it to 0.7 ± 0.2 mm.

It is not possible to adjust the impeller clearance
of SV pumps.

The impeller clearance of installation types S and C can be
inspected directly through the pump inlet.

Warning
Before inspection, make sure that the motor is

switched off and that the mains switch is locked
in position 0.

Installation versions D and H can be inspected and adjusted with
the pump installed on the base stand and connected to the
pipework. Inspect and adjust the impeller clearance as described
in sections 9.2.2 Installation types D and H, range 50-54 and

9.2.3 Installation types D and H, range 58-70.

TM05 1916 3911

Fig. 16 Impeller clearance adjustment

9.2.2 Installation types D and H, range 50-54

1. Slacken the set screws by two full turns each.

2. Close the impeller clearance by lightly tightening the fastening
screws diagonally until the impeller touches the pump
housing.

Warning
Do not use too much force when tightening the

fastening screws as this may damage the
bearings. The movement is usual 1 to 3 mm.

3. Slacken the fastening screws to make an 0.7 mm gap under
the heads of the fastening screws. See fig. 16.

4. Tighten the set screws tightly.

5. Tighten the fastening screws diagonally.

16

9.2.3 Installation types D and H, range 58-70

0.5 - 0.9

L

Set screw

Fastening screw Fastening screw

Adjust the clearance between the impeller and the pump housing
by following these steps:

1. Slacken the six fastening screws and close the impeller
clearance by tightening the three set screws. Tighten the
screws diagonally to move the suction cover evenly.

Warning
Do not use too much force when tightening the

fastening screws as this may damage the
bearings. The movement is usual 1 to 3 mm.

2. Measure the distance "L" between suction cover and pump
housing at three points next to the set screws, using feeler
gauges or callipers, and make a note of the distance.

3. Slacken the set screws and draw back the suction cover by
between 0.5 and 0.9 mm using the six fastening screws
(approx. one 270 ° turn of an M12 fastening screw) and the
distance "L" as reference. See fig. 17.

4. Tighten all set screws and check that the distance "L" at the
three reference points is stable at the new value.

Fig. 17 Impeller clearance adjustment

9.3 Explosion-proof S pumps, range 50-70

Overhauled and repaired explosion-proof motors are marked with
a repair plate giving the following information:

• the repair symbol R

• name or registered trade mark of the repairing workshop

• workshop reference number relating to the repair

• date of overhaul or repair.
In the event of subsequent repairs, the existing plate should be

replaced by a new updated plate and earlier markings are
recorded.

The repairing workshop must keep records of performed
overhauls and repairs together with records of all previous
overhauls, repairs and possible modifications. Copies of the
repairing workshop’s detailed records should be filed by the
owner or operator together with the original type certificate of the
explosion-proof motor in question.

9.3.1 Motor cable

Use only cables which are approved by the manufacturer and
suitable for the cable entry as to diameter, number of leads,
conductor cross section and sheath material.

9.3.2 Cable entry

Use only EExd cable entry parts corresponding to the cable
diameter. The corresponding cable dimension marking is
stamped on the inlet or the cable entry.

Secure the cable entry to the motor top cover by tightening the
screws evenly one by one until the cable entry is lying flat against
the top cover.

9.3.3 Spare parts

Damaged motor parts, such as top cover and cable entry, should
always be replaced by new and approved parts. Motor parts must
not be reconditioned by machining, re-tapping, welding, etc.

TM05 1916 3911

9.4 Contaminated pumps

Warnin g
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 to be 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.

English (GB)

17

10. Fault finding

English (GB)

Fault Cause Remedy

1. Pump does not start or
stops without visible cause.

2. Pump does not start or
stops. The control panel of
the controller indicates that
the motor protective circuit
breaker or protection
equipment has tripped out.

3. Pump runs but does not
deliver the rated flow.

4. Pump starts, but stops
immediately.

5. Pump vibrating or emitting
excessive noise.

6. Oil watery or emulsified. a) Lower mechanical seal leaking. Contact an authorised service workshop.

7. Low oil level. a) Upper mechanical seal leaking. Contact an authorised service workshop.

Warning
Before attempting to diagnose any fault, make sure that the fuses have been removed or the mains switch has been

switched off. Make sure that the power supply cannot be accidentally switched on. All rotating parts must have
stopped moving.

Read and observe the safety instructions in section 3. Safety.

a) No power supply. Reestablish power supply. Start the pump

manually and check contactor operation.
a) Missing phase. Reestablish all phases.
b) Pump momentarily overloaded. If the fault does not disappear automatically, find

c) Impeller clogged by impurities. Clean impeller as required.
d) Motor protective circuit breaker not set

correctly.

e) Thermal switches tripped out.

Insufficient motor cooling.
f) Moisture switch in motor tripped out. Contact an authorised service workshop.
g) Motor cable defective. Contact an authorised service workshop.
h) Fluctuating voltage. Reestablish correct voltage supply.

a) Wrong direction of rotation. Interchange two phases to the motor.
b) Impeller loose or worn. Tighten or replace the impeller.
c) Pump or pipework blocked by impurities. Clean as required.
d) Pump head too high. Measure the differential pressure and compare the

e) Valves closed or blocked.

Non-return valve not operating.
f) Air in pump or suction pipe. Vent the pump and suction pipe. Increase the stop

g) Pumped liquid too dense. Dilute the liquid.
h) Pump not properly connected to auto

coupling.
i) Leakage in pipework. Repair the pipework.
j) Pump tank flushing system inadvertently

activated.
a) Clogged pump causes motor-protective circuit

breaker to trip out.
b) Overheated motor causes thermal switches to

trip out.
c) Level switch out of adjustment or defective. Clean or set level switch or replace as required.
a) Pump partly choked by impurities. Clean the pump.
b) Wrong direction of rotation. Interchange two phases to the motor.
c) Pump operates outside specified operating

range.
d) Pump defective. Repair the pump or contact an authorised

e) Pump not properly connected to auto

coupling.
f) Pump cavitates. Clean the suction pipe.
g) Base stand, auto coupling, ring stand or guide

rails not installed correctly.

the cause and remedy the fault.

Set the motor protective circuit breaker as
required according to rated current.

Reestablish motor cooling.

Permissible deviation is - 10 %/+ 10 %.

value with the pump curve. Remove the blockage
in the discharge pipe.

Clean or replace valves as required.

level in the tank.

Pump down the liquid level in tank. Lift out the
pump and relocate the pump on the auto coupling.

Check function and repair as required.

Clean the pump.

Allow pump to cool. Clean the pump.

Reestablish proper operating conditions.

workshop, if necessary.
Pump down the liquid level in tank. Lift out the

pump and relocate the pump on the auto coupling.

Install the components correctly.

11. Disposal

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.

Subject to alterations.

18

Appendix 1

Switch board connection

Internal connection for sensors

Switch board connection

Internal connection for sensors

1. Wiring diagrams

Fig. 1 Wiring diagram for sensor cable 7-lead wires

Appendix

TM05 1641 3311

Fig. 2 Wiring diagram for sensor cable 10-lead wires

TM05 1624 3311

19

Declaration of conformity

Declaration of conformity 2

GB: EC declaration of Conformity

We Grundfos declare under our sole responsibility that the products
S pumps, ranges 50-70, 7.5-155 kW, to which this declaration relates, are
in conformity with these Council directives on the approximation of the laws
of the EC member states:

BG: EC декларация за съответствие

Ние, фирма Grundfos, заявяваме с пълна отговорност, че продуктите
Помпите модел S, типорамери 50-70, 7,5-155 kW, за които се отнася
настоящата декларация, отговарят на следните указания на Съвета за
уеднаквяване на правните разпоредби на държавите членки на ЕС:

CZ: ES prohlášení o konformitě

My firma Grundfos prohlašujeme na svou plnou odpovědnost, že výrobky
Čerpadla S, řady 50-70, 7,5-155 kW, na něž se toto prohlášení vztahuje,

jsou v souladu s ustanoveními směrnice Rady pro sblížení právních
předpisů členských států Evropského společenství v oblastech:

DE: EG-Konformitätserklärung

Wir, Grundfos, erklären in alleiniger Verantwortung, dass die Produkte
S-Pumpen der Baugrößen 50-70, 7,5-155 kW, auf die sich diese Erklärung
bezieht, mit den folgenden Richtlinien des Rates zur Angleichung der
Rechtsvorschriften der EU-Mitgliedsstaaten übereinstimmen:

GR: ∆ήλωση συμμόρφωσης EC

Εμείς, η Grundfos, δηλώνουμε με αποκλειστικά δική μας ευθύνη ότι τα
προϊόντα Αντλίες S, σειρές 50-70, 7,5-155 kW στα οποία αναφέρεται η
παρούσα δήλωση, συμμορφώνονται με τις εξής Οδηγίες του Συμβουλίου
περί προσέγγισης των νομοθεσιών των κρατών μελών της ΕΕ:

FR: Déclaration de conformité CE

Nous, Grundfos, déclarons sous notre seule responsabilité, que les
produits Pompes S, tailles 50-70, 7,5-155 kW, auxquels se réfère cette
déclaration, sont conformes aux Directives du Conseil concernant le
rapprochement des législations des Etats membres CE relatives aux
normes énoncées ci-dessous :

IT: Dichiarazione di conformità CE

Grundfos dichiara sotto la sua esclusiva responsabilità che i prodotti
Pompe S, della gamma 50-70, da 7,5-155 kW, ai quali si riferisce questa
dichiarazione, sono conformi alle seguenti direttive del Consiglio
riguardanti il riavvicinamento delle legislazioni degli Stati membri CE:

LV: EK atbilstības deklarācija

Sabiedrība GRUNDFOS ar pilnu atbildību dara zināmu, ka produkti
Ssērijas sūkņi, ar jaudu 50-70, 7,5-155 kW, uz kuriem attiecas šis
paziņojums, atbilst šādām Padomes direktīvām par tuvināšanos EK
dalībvalstu likumdošanas normām:

DK: EF-overensstemmelseserklæring

Vi Grundfos erklærer under ansvar at produkterne S pumper, serie 50-70,
7,5-155 kW, som denne erklæring omhandler, er i overensstemmelse med
disse af Rådets direktiver om indbyrdes tilnærmelse til EF­medlemsstaternes lovgivning om:

EE: EL vastavusdeklaratsioon

Meie, Grundfos, deklareerime enda ainuvastutusel, et tooted S pumbed,
suurusklass 50-70, 7,5-155 kW, mille kohta käesolev juhend käib, on
vastavuses EÜ Nõukogu direktiividega EMÜ liikmesriikide seaduste
ühitamise kohta, mis käsitlevad:X tunnustuse andmesildiga ja EC-tüüpi
kontrollsertifikaadiga.

ES: Declaración CE de conformidad

Nosotros Grundfos declaramos bajo nuestra entera responsabilidad que
los productos Bombas S, gamas 50-70, 7,5-155 kW, a los cuales se refiere
esta declaración, están conformes con las Directivas del Consejo en la
aproximación de las leyes de las Estados Miembros del EM:

HR: EZ izjava o usklađenosti

Mi, Grundfos, izjavljujemo pod vlastitom odgovornošću da je proizvod
Scrpke, veličine 50-70, 7,5-155 kW, na koji se ova izjava odnosi, u skladu
s direktivama ovog Vijeća o usklađivanju zakona država članica EU:

KZ: EO cəйкестік туралы мəлімдеме

Біз, Grundfos компаниясы, барлық жауапкершілікпен, осы мəлімдемеге
қатысты болатын S қатарындағы, түр өлшемдері 50-70, 7,5 тен 155 кВт
бұйымдары ЕО мүше елдерінің заң шығарушы жарлықтарын үндестіру
туралы мына Еуроодақ Кеңесінің жарлықтарына сəйкес келетіндігін
мəлімдейміз:

LT: EB atitikties deklaracija

Mes, Grundfos, su visa atsakomybe pareiškiame, kad gaminiai S siurbliai,
dydžiai 50-70, 7,5-155 kW, kuriems skirta ši deklaracija, atitinka šias
Tarybos Direktyvas dėl Europos Ekonominės Bendrijos šalių narių įstatymų
suderinimo:

HU: EK megfelelőségi nyilatkozat

Mi, a Grundfos, egyedüli felelősséggel kijelentjük, hogy a S-sorozatú
szivattyúk 50-70-es vázméret, 7,5-155 kW termékek, amelyekre jelen
nyilatkozik vonatkozik, megfelelnek az Európai Unió tagállamainak jogi
irányelveit összehangoló tanács alábbi előírásainak:

UA: Декларація відповідності ЄС

Компанія Grundfos заявляє про свою виключну відповідальність за те,
що продукти Насоси серії S, типорозмірів 50-70, 7,5-155 кВт, на які
поширюється дана декларація, відповідають таким рекомендаціям
Ради з уніфікації правових норм країн - членів ЕС:

PT: Declaração de conformidade CE

A Grundfos declara sob sua única responsabilidade que os produtos
Bombas S, gamas 50-70, 7,5-155 kW, aos quais diz respeito esta
declaração, estão em conformidade com as seguintes Directivas do
Conselho sobre a aproximação das legislações dos Estados Membros
da CE:

RO: Declaraţie de conformitate CE

Noi, Grundfos, declarăm pe propria răspundere că produsele din gama
pompelor S 50-70, 7,5-155 kW, la care se referă această declaraţie, sunt în
conformitate cu aceste Directive de Consiliu asupra armonizării legilor
Statelor Membre CE:

SI: ES izjava o skladnosti

V Grundfosu s polno odgovornostjo izjavljamo, da so naši izdelki S črpalke
velikosti 50-70, 7,5-155 kW, na katere se ta izjava nanaša, v skladu z
naslednjimi direktivami Sveta o približevanju zakonodaje za izenačevanje
pravnih predpisov držav članic ES:

FI: EY-vaatimustenmukaisuusvakuutus

Me Grundfos vakuutamme omalla vastuullamme, että tuotteet S-pumput,
sarjat 50-70, 7,5-155 kW, joita tämä vakuutus koskee, ovat EY:n
jäsenvaltioiden lainsäädännön yhdenmukaistamiseen tähtäävien Euroopan
neuvoston direktiivien vaatimusten mukaisia seuraavasti:

NL: EC overeenkomstigheidsverklaring

Wij Grundfos verklaren geheel onder eigen verantwoordelijkheid dat de
producten S Pompen serie 50-70 van 7,5-155 kW waarop deze verklaring
betrekking heeft, in overeenstemming zijn met de Richtlijnen van de Raad
in zake de onderlinge aanpassing van de wetgeving van de EG Lidstaten
betreffende:

PL: Deklaracja zgodności WE

My, Grundfos, oświadczamy z pełną odpowiedzialnością, że nasze wyroby
Pompy z typoszeregu S, korpus 50-70, o mocy 7,5-155 kW, których
deklaracja niniejsza dotyczy, są zgodne z następującymi wytycznymi Rady
d/s ujednolicenia przepisów prawnych krajów członkowskich WE:

RU: Декларация о соответствии ЕС

Мы, компания Grundfos, со всей ответственностью заявляем, что
изделия Насосы S, типоразмеров 50-70, 7,5-155 кВт, к которым
относится настоящая декларация, соответствуют следующим
Директивам Совета Евросоюза об унификации законодательных
предписаний стран-членов ЕС:

SK: Prehlásenie o konformite ES

My firma Grundfos prehlasujeme na svoju plnú zodpovednost’, že výrobky
Čerpadlá S, rady 50-70, 7,5-155 kW, na ktoré sa toto prehlásenie vzt’ahuje,
sú v súlade s ustanovením smernice Rady pre zblíženie právnych
predpisov členských štátov Európskeho spoločenstva v oblastiach:

RS: EC deklaracija o usaglašenosti

Mi, Grundfos, izjavljujemo pod vlastitom odgovornošću da je proizvod
S pumpe, veličine 50-70, 7,5-155 kW, na koji se ova izjava odnosi, u
skladu sa direktivama Saveta za usklađivanje zakona država članica EU:

SE: EG-försäkran om överensstämmelse

Vi, Grundfos, försäkrar under ansvar att produkterna Serie S,
typstorlek 50-70, 7,5-155 kW, som omfattas av denna försäkran,
är i överensstämmelse med rådets direktiv om inbördes närmande till
EU-medlemsstaternas lagstiftning, avseende:

20

TR: EC uygunluk bildirgesi

Grundfos olarak bu beyannameye konu olan S pompaların, 50-70 ürün
aralığını n, 7,5-155 kW ürünlerinin, AB Üyesi Ülkelerin kanunlarını birbirine
yaklaştırma üzerine Konsey Direktifleriyle uyumlu olduğunun yalnızca
bizim sorumluluğumuz altında olduğunu beyan ederiz:

— Machinery Directive (2006/42/EC)

Standard used: SFS-EN 809 + A1/AC:2010.
— EMC Directive (2004/108/EC)
— ATEX Directive (94/9/EC)

Applies only to products intended for use in potentially explosive

environments, Group II Category 2G, Ex bcd IIB T3 Gb, and equipped

with the separate ATEX approval plate and EC-type examination

certificate.

Székesfehérvár, 8th April 2014

Jannek Uldal Christensen

D&E Central Europe, site manager

Holland fasor 15, Sóstó Ipari Park

8000 Székesfehérvár Hungary

Person authorised to compile technical file and

empowered to sign the EC declaration of conformity.

Notified body for EC-Type examination: SGS Baseefa Ltd. No 1180. Buxton, UK.

Notified body for production at GMH2: Dekra Certification B.V. No 0344, 6802 ED Arnhem, The Neatherlands.
Notified body for production at GMH4: SGS Baseefa Ltd. No 1180. Buxton, UK.

Manufacturer, Ranges 50 to 58: Grundfos GMH2 HU-2800 Tatabánya, Hungary
Manufacturer, Ranges 62 to 70: Grundfos GMH4 HU-8000 Székesfehérvár, Hungary

Range Certificate No Standards used

50, 54, 58, 62, 66, 70 Baseefa 09ATEX0020X EN 60079-0: 2009, EN 60079-1: 2007,

EN 13463-1: 2009, EN 13463-5: 2011, EN 13463-6: 2005

Declaration of conformity

21

Declaration of conformity RU

Declaration of conformity RU 2

Декларация о соответствии на территории РФ

Насосы серии S исполнения: S1, S2, S3, S4, SV, S1A, SVA, ST, SVX
сертифицированы на соответствие требованиям Технического
регламента о безопасности машин и оборудования (Постановление
правительства РФ от 15.09.2009 №753).
Сертификат соответствия:
№ C-DK.АИ30.B.02496, срок действия до 22.12.2016 г.

Истра, , 1 августа 2013 г.

Касаткина В. В.

Руководитель отдела качества,

экологии и охраны труда

ООО Грундфос Истра, Россия

143581, Московская область,

Истринский район,

дер. Лешково, д.188

22

Argentina

Bombas GRUNDFOS de Argentina S.A.
Ruta Panamericana km. 37.500 Centro
Industrial Garin
1619 Garín Pcia. de B.A.
Phone: [phone]
Telefax: [phone]

Australia

GRUNDFOS Pumps Pty. Ltd.
P.O. Box 2040
Regency Park
South Australia 5942
Phone: [phone]
Telefax: [phone]

Austria

GRUNDFOS Pumpen Vertrieb Ges.m.b.H.
Grundfosstraße 2
A-5082 Grödig/Salzburg
Tel.: [phone]
Telefax: [phone]

Belgium

N.V. GRUNDFOS Bellux S.A.
Boomsesteenweg 81-83
B-2630 Aartselaar
Tél.: [phone]
Télécopie: [phone]

Belarus

Представительство ГРУНДФОС в
Минске
220125, Минск
ул. Шафарнянская, 11, оф. 56, БЦ
«Порт»
Тел.: [phone]
Факс: [phone]

E-mail: [e-mail]

Bosna and Herzegovina

GRUNDFOS Sarajevo
Zmaja od Bosne 7-7A,
BH-71000 Sarajevo
Phone: [phone]
Telefax: [phone]
www.ba.grundfos.com
e-mail: [e-mail]

Brazil

BOMBAS GRUNDFOS DO BRASIL
Av. Humberto de Alencar Castelo Branco,
630
CEP 09850 - 300
São Bernardo do Campo - SP
Phone: [phone]
Telefax: [phone]

Bulgaria

Grundfos Bulgaria EOOD
Slatina District
Iztochna Tangenta street no. 100
BG - 1592 Sofia
Tel. [phone]
Fax. [phone]
email: [e-mail]

Canada

GRUNDFOS Canada Inc.
2941 Brighton Road
Oakville, Ontario
L6H 6C9
Phone: [phone]
Telefax: [phone]

China

GRUNDFOS Pumps (Shanghai) Co. Ltd.
50/F Maxdo Center No. 8 XingYi Rd.
Hongqiao development Zone
Shanghai 200336
PRC
Phone: [phone]
Telefax: [phone]

Croatia

GRUNDFOS CROATIA d.o.o.
Buzinski prilaz 38, Buzin
HR-10010 Zagreb
Phone: [phone]
Telefax: [phone]
www.hr.grundfos.com

Czech Republic

GRUNDFOS s.r.o.
Čajkovského 21
779 00 Olomouc
Phone: [phone]
Telefax: [phone]

Denmark

GRUNDFOS DK A/S
Martin Bachs Vej 3
DK-8850 Bjerringbro
Tlf.: [phone]
Telefax: [phone]
E-mail: [e-mail]
www.grundfos.com/DK

Estonia

GRUNDFOS Pumps Eesti OÜ
Peterburi tee 92G
11415 Tallinn
Tel: + 372 606 1690
Fax: + 372 606 1691

Finland

OY GRUNDFOS Pumput AB
Mestarintie 11
FIN-01730 Vantaa
Phone: [phone]
Telefax: [phone]

France

Pompes GRUNDFOS Distribution S.A.
Parc d’Activités de Chesnes
57, rue de Malacombe
F-38290 St. Quentin Fallavier (Lyon)
Tél.: [phone]
Télécopie: [phone]

Germany

GRUNDFOS GMBH
Schlüterstr. 33
40699 Erkrath
Tel.: [phone]
Telefax: [phone]
e-mail: [e-mail]
Service in Deutschland:
e-mail: [e-mail]

HILGE GmbH & Co. KG
Hilgestrasse 37-47
55292 Bodenheim/Rhein
Germany
Tel.: [phone]
Telefax: [phone]
e-mail: [e-mail]

Greece

GRUNDFOS Hellas A.E.B.E.
20th km. Athinon-Markopoulou Av.
P.O . B o x 7 1
GR-19002 Peania
Phone: [phone]
Telefax: +0030-210-66 46 273

Hong Kong

GRUNDFOS Pumps (Hong Kong) Ltd.
Unit 1, Ground floor
Siu Wai Industrial Centre
29-33 Wing Hong Street &
68 King Lam Street, Cheung Sha Wan
Kowloon
Phone: [phone]
Telefax: [phone]

Hungary

GRUNDFOS Hungária Kft.
Park u. 8
H-2045 Törökbálint,
Phone: [phone]
Telefax: [phone]

India

GRUNDFOS Pumps India Private Limited
118 Old Mahabalipuram Road
Thoraipakkam
Chennai 600 096
Phone: [phone]

Indonesia

PT GRUNDFOS Pompa
Jl. Rawa Sumur III, Blok III / CC-1
Kawasan Industri, Pulogadung
Jakarta 13930
Phone: [phone]
Telefax: [phone] / 460 6901

Ireland

GRUNDFOS (Ireland) Ltd.
Unit A, Merrywell Business Park
Ballymount Road Lower
Dublin 12
Phone: [phone]
Telefax: [phone]

Italy

GRUNDFOS Pompe Italia S.r.l.
Via Gran Sasso 4
I-20060 Truccazzano (Milano)
Tel.: [phone]
Telefax: [phone] / 95838461

Japan

GRUNDFOS Pumps K.K.
Gotanda Metalion Bldg., 5F,
5-21-15, Higashi-gotanda
Shiagawa-ku, Tokyo
141-0022 Japan
Phone: [phone]
Telefax: [phone]

Korea

GRUNDFOS Pumps Korea Ltd.
6th Floor, Aju Building 679-5
Yeoksam-dong, Kangnam-ku, 135-916
Seoul, Korea
Phone: [phone]
Telefax: [phone]

Latvia

SIA GRUNDFOS Pumps Latvia
Deglava biznesa centrs
Augusta Deglava ielā 60, LV-1035, Rīga,
Tālr.: + 371 714 9640, 7 149 641
Fakss: + 371 914 9646

Lithuania

GRUNDFOS Pumps UAB
Smolensko g. 6
LT-03201 Vilnius
Tel: + 370 52 395 430
Fax: + 370 52 395 431

Malaysia

GRUNDFOS Pumps Sdn. Bhd.
7 Jalan Peguam U1/25
Glenmarie Industrial Park
40150 Shah Alam
Selangor
Phone: [phone]
Telefax: [phone]

Mexico

Bombas GRUNDFOS de México S.A. de
C.V.
Boulevard TLC No. 15
Parque Industrial Stiva Aeropuerto
Apodaca, N.L. 66600
Phone: [phone]
Telefax: [phone]

Netherlands

GRUNDFOS Netherlands
Velu we zo om 35
1326 AE Almere
Postbus 22015
1302 CA ALMERE
Tel.: [phone]
Telefax: [phone]
E-mail: [e-mail]

New Zealand

GRUNDFOS Pumps NZ Ltd.
17 Beatrice Tinsley Crescent
North Harbour Industrial Estate
Albany, Auckland
Phone: [phone]
Telefax: [phone]

Norway

GRUNDFOS Pumper A/S
Strømsveien 344
Postboks 235, Leirdal
N-1011 Oslo
Tlf.: [phone]
Telefax: [phone]

Poland

GRUNDFOS Pompy Sp. z o.o.
ul. Klonowa 23
Baranowo k. Poznania
PL-62-081 Przeźmierowo
Tel: [phone]
Fax: [phone]

Portugal

Bombas GRUNDFOS Portugal, S.A.
Rua Calvet de Magalhães, 241
Apartado 1079
P-2770-153 Paço de Arcos
Tel.: [phone]
Telefax: [phone]

Romania

GRUNDFOS Pompe România SRL
Bd. Biruintei, nr 103
Pantelimon county Ilfov
Phone: [phone]
Telefax: [phone]
E-mail: [e-mail]

Russia

ООО Грундф ос Россия
109544, г. Москва, ул. Школьная, 39-41,

стр. 1
Тел. [phone] [phone]
Факс [phone]

E-mail [e-mail]

Serbia

Grundfos Srbija d.o.o.
Omladinskih brigada 90b
11070 Novi Beograd
Phone: [phone]
Telefax: [phone]
www.rs.grundfos.com

Singapore

GRUNDFOS (Singapore) Pte. Ltd.
25 Jalan Tukang
Singapore 619264
Phone: [phone]
Telefax: [phone]

Slovakia

GRUNDFOS s.r.o.
Prievozská 4D
821 09 BRATISLAVA
Phona: [phone]
sk.grundfos.com

Slovenia

GRUNDFOS d.o.o.
Šlandrova 8b, SI-1231 Ljubljana-Črnuče
Phone: [phone]
Telefax: [phone]
E-mail: [e-mail]

South Africa

GRUNDFOS (PTY) LTD
Corner Mountjoy and George Allen Roads
Wilbart Ext. 2
Bedfordview 2008
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

Spain

Bombas GRUNDFOS España S.A.
Camino de la Fuentecilla, s/n
E-28110 Algete (Madrid)
Tel.: [phone]
Telefax: [phone]

Sweden

GRUNDFOS AB
Box 333 (Lunnagårdsgatan 6)
431 24 Mölndal
Tel.: [phone]
Telefax: [phone]

Switzerland

GRUNDFOS Pumpen AG
Bruggacherstrasse 10
CH-8117 Fällanden/ZH
Tel.: [phone]
Telefax: [phone]

Taiwan

GRUNDFOS Pumps (Taiwan) Ltd.
7 Floor, 219 Min-Chuan Road
Taichung, Taiwan, R.O.C.
Phone: [phone]
Telefax: [phone]

Thailand

GRUNDFOS (Thailand) Ltd.
92 Chaloem Phrakiat Rama 9 Road,
Dokmai, Pravej, Bangkok 10250
Phone: [phone]
Telefax: [phone]

Turkey

GRUNDFOS POMPA San. ve Tic. Ltd. Sti.
Gebze Organize Sanayi Bölgesi
Ihsan dede Caddesi,

2. yol 200. Sokak No. 204
41490 Gebze/ Kocaeli
Phone: +90 - 262-679 7979
Telefax: +90 - 262-679 7905
E-mail: [e-mail]

Ukraine

Бізнес Центр Європа
Столичне шосе, 103
м. Київ, 03131, Україна
Телефон : [phone]
Факс.: [phone]

E-mail: [e-mail]

United Arab Emirates

GRUNDFOS Gulf Distribution
P.O. Box 16768
Jebel Ali Free Zone
Dubai
Phone: [phone]
Telefax: [phone]

United Kingdom

GRUNDFOS Pumps Ltd.
Grovebury Road
Leighton Buzzard/Beds. LU7 4TL
Phone: [phone]
Telefax: [phone]

U.S.A.

GRUNDFOS Pumps Corporation
17100 West 118th Terrace
Olathe, Kansas 66061
Phone: [phone]
Telefax: [phone]

Uzbekistan

Grundfos Tashkent, Uzbekistan The
Representative Office of Grundfos
Kazakhstan in Uzbekistan
38a, Oybek street, Tashkent
Телефон: [phone] / 71 150
3291
Факс: [phone]

Addresses Revised 21.05.2014

Grundfos companies

96838602 0714

ECM: 1132414

www.grundfos.com

The name Grundfos, the Grundfos logo, and be think innovate are registered trademarks owned by Grundfos Holding A/S or Grundfos A/S, Denmark. All rights reserved worldwide. © Copyright Grundfos Holding A/S