Grundfos SQE-NE Series Bedienungsanleitung

English (GB)

English (GB) Installation and operating instructions

Original installation and operating instructions.

CONTENTS Page

1. Symbols used in this document

2. General

On page 341 of these installation and operating

instructions, you will find copies of the pump and

motor nameplates.

Before the SQ/SQE pump is lowered into the

borehole, this page should be filled in with the

relevant nameplate data.

These installation and operating instructions must be

kept in a dry place near the installation site for

reference purposes.

2.1 Applications

The SQ and SQE pumps are designed for pumping

thin, clean, non-aggressive, non-explosive liquids,

not containing solid particles or fibres.

Typical applications:

• Groundwater supply for

– private housing

– small waterworks

– irrigation systems in for instance green houses.

• Liquid transfer in tanks.

• Pressure boosting.

1. Symbols used in this document 8

2. General 8

2.1 Applications 8

3. Technical data 9

3.1 Storage 9

3.2 Sound pressure level 9

4. Preparation 10

4.1 Refilling of motor liquid 10

4.2 Positional requirements 10

4.3 Liquid temperatures/cooling 10

5. Electrical connection 11

5.1 General 11

5.2 Motor protection 12

5.3 Connection of motor 12

6. Installation 12

6.1 General 12

6.2 Assembly of pump part and motor 12

6.3 Removal of non-return valve 12

6.4 Fitting the cable plug to the motor 13

6.5 Fitting the cable guard 13

6.6 Cable sizing 14

6.7 Fitting the submersible drop cable 14

6.8 Pipework connection 15

7. Start-up 16

8. Operation 16

8.1 Minimum flow rate 16

8.2 Selection of diaphragm tank and setting

of precharge pressure and pressure

switch 16

8.3 Built-in protection 17

9. Maintenance and service 17

9.1 Contaminated pumps 17

10. Fault finding chart 18

10.1 Megging 19

11. Checking the power supply 20

12. Environment 20

13. Disposal 20

Warning

Prior to installation, read these

installation and operating instructions.

Installation and operation must comply

with local regulations and accepted

codes of good practice.

Warning

The use of this product requires

experience with and knowledge of the

product.

Persons with reduced physical,

sensory or mental capabilities must not

use this product, unless they are under

supervision or have been instructed in

the use of the product by a person

responsible for their safety.

Children must not use or play with this

product.

Warning

If these safety instructions are not

observed, it may result in personal

injury!

Caution

If these safety instructions are not

observed, it may result in malfunction

or damage to the equipment!

Note

Notes or instructions that make the job

easier and ensure safe operation.

English (GB)

The SQE-NE pumps are designed for pumping thin,

clean, non-explosive liquids, not containing solid

particles or fibres.

These pumps are suitable for pumping contaminated

or hydrogen-carbonate containing groundwater, e.g.

from

• dumps

• chemical depots

• industrial areas

• oil and petrol filling stations

• environmental applications.

The SQE-NE pumps can also be used for sampling

and monitoring and to some extent for incorporation

in water treatment systems.

Information applying to all pump types

The maximum sand content of the water must not

exceed 50 g/m3. A larger sand content will reduce

the life of the pump and increase the risk of blocking.

pH values

SQ and SQE: 5 to 9.

SQE-NE: Please contact Grundfos.

Liquid temperature

The temperature of the pumped liquid must not

exceed 35 °C.

3. Technical data

Supply voltage

1 x 200-240 V - 10 %/+ 6 %, 50/60 Hz, PE.

Operation via generator: As a minimum, the

generator output must be equal to the motor P1[kW]

+ 10 %.

Starting current

The motor starting current is equal to the highest

value stated on the motor nameplate.

Power factor

PF = 1.

Motor liquid

Type SML 2.

Motor cable

1.5 m, 3 x 1.5 mm2, PE.

Liquid temperature

Maximum 35 °C.

Pump outlet size

SQ 1, SQ 2, SQ 3: Rp 1 1/4.

SQ 5, SQ 7: Rp 1 1/2.

Pump diameter

74 mm.

Borehole diameter

Minimum 76 mm.

Installation depth

Maximum 150 m below static water level.

See also section 6.8.2 Installation depths.

Net weight

Maximum 6.5 kg.

3.1 Storage

Storage temperature: -20 °C to +60 °C.

3.1.1 Frost protection

If the pump has to be stored after use, it must be

stored on a frost-free location or it must be ensured

that the motor liquid is frost-proof.

The motor must not be stored without being filled

with motor liquid.

3.2 Sound pressure level

The sound pressure level of the pump is lower than

the limiting values stated in the EC Council Directive

2006/42/EC relating to machinery.

Note

If liquids with a viscosity higher than

that of water are to be pumped, please

contact Grundfos.

English (GB)

4. Preparation

Grundfos MS 3 and MSE 3 submersible motors have

water-lubricated slide bearings. No additional

lubrication is required.

The submersible motors are factory-filled with a

special Grundfos motor liquid (type SML 2), which is

frost-proof down to - 20 °C and preserved to prevent

the growth of bacteria.

The level of motor liquid is decisive for the operating

life of the bearings and consequently the life of the

motor.

4.1 Refilling of motor liquid

If for any reason the motor liquid has been drained or

lost, the motor must be refilled with Grundfos motor

liquid SML 2.

To refill the motor, proceed as follows:

1. Remove the cable guard and separate the pump

part from the motor.

Fig. 1

2. Place the motor in vertical position with an

inclination of approx. 10 °.

3. Remove the filling plug using a screwdriver or

a similar tool.

4. Inject motor liquid into the motor with a filling

syringe or the like.

5. To allow possible air to escape, move the motor

from side to side.

6. Refit the filling plug and make sure it is tight.

7. Assemble pump part and motor.

8. Refit the cable guard.

The pump is now ready for installation.

4.2 Positional requirements

The pump is suitable for vertical as well as horizontal

installation, however, the pump shaft must never fall

below the horizontal plane. See fig. 2.

Fig. 2

If the pump is to be installed horizontally, e.g. in a

tank, and there is a risk that the pump might be

covered by mud, it must be fitted in a flow sleeve.

For installation depths, see section 6.8.2.

4.3 Liquid temperatures/cooling

Figure 3 shows an SQ/SQE pump installed in a

borehole. The pump is operating.

Figure 3 illustrates the following:

• borehole diameter

• pump diameter

• temperature of pumped liquid

• flow past the motor to the pump suction strainer.

TM02 9606 3504

TM01 1375 4397

Allowed

Not allowed

English (GB)

Fig. 3

To ensure sufficient cooling of the motor, it is

important to observe the maximum liquid

temperature of 35 °C under all conditions.

The motor should always be installed above the well

screen. If a flow sleeve is used, the pump may be

installed freely in the borehole.

If the actual temperature of the pumped liquid

exceeds the specified value or the operating

conditions otherwise fall outside the specified

conditions, the pump may stop. Please contact

Grundfos.

5. Electrical connection

5.1 General

The electrical connection should be carried out by an

authorised electrician in accordance with local

regulations.

The supply voltage, rated maximum current and

power factor (PF) appear from the motor nameplate.

The required voltage for Grundfos submersible

motors, measured at the motor terminals, is - 10 %/

+ 6 % of the nominal voltage during continuous

operation (including variation in the supply voltage

and losses in cables).

If the pump is connected to an electric installation

where an earth-leakage circuit breaker (ELCB) is

used as an additional protection, this circuit breaker

must trip out when earth fault currents with DC

content (pulsating DC) occur.

The earth leakage circuit breaker must be marked

with the following symbol: .

Supply voltage

1 x 200-240 V - 10 %/+ 6 %, 50/60 Hz, PE.

The current consumption can only be measured by

means of a true RMS instrument. If other instruments

are used, the value measured will differ from the

actual value.

On SQ/SQE pumps, a leakage current of 2.5 mA at

230 V, 50 Hz, can typically be measured. The

leakage current is proportional to the supply voltage.

The SQE and SQE-NE pumps can be connected to a

control box, type CU 300 or CU 301.

TM01 0518 1297

Caution

The borehole diameter must be at least

76 mm (approx. 3").

Caution

Do not let the pump run against a

closed discharge pipe for more than

5 minutes. When the discharge pipe is

closed, there is no cooling flow and

there is a risk of overtemperature in

motor and pump.

Liquid

temperature

Borehole

diameter

Pump

diameter

Warning

Before starting work on the pump,

make sure that the power supply has

been switched off and that it cannot be

accidentally switched on.

The pump must be earthed.

The pump must be connected to an

external mains switch with a minimum

contact gap of 3 mm in all poles.

If the motor cable is damaged, it must

be replaced by Grundfos, an authorised

Grundfos service workshop or similarly

qualified persons to avoid a hazard.

Caution

The pump must never be connected to

a capacitor or to another type of control

box than CU 300 or CU 301.

The pump must never be connected to

an external frequency converter.

English (GB)

5.2 Motor protection

The motor incorporates thermal overload protection

and requires no additional motor protection.

5.3 Connection of motor

The motor incorporates a starter device and can

therefore be connected directly to the mains.

Start/stop of the pump will typically be done via a

pressure switch. See fig. 4.

Fig. 4

6. Installation

6.1 General

The loose data plate supplied with the pump should

be fixed close to the installation site.

6.2 Assembly of pump part and motor

To assemble pump part and motor, proceed as

follows:

1. Place the motor horizontally in a vice and tighten

it. See fig. 6.

2. Pull the pump shaft out to the position shown in

fig. 5.

Fig. 5

3. Grease the motor shaft end with the grease

supplied with the motor.

4. Screw the pump part on the motor (55 Nm).

Caution: The pump shaft must engage with the

motor shaft.

A spanner may be used on the clamping faces of

the pump part. See fig. 6.

Fig. 6

When pump part and motor have been assembled

correctly, there must not be a clearance between

pump part and motor.

6.3 Removal of non-return valve

If a pump without non-return valve is required, the

valve can be removed as follows:

1. Cut off the legs of the valve guide using side-

cutting pliers or a similar tool. See fig. 7.

2. Turn the pump upside down.

3. Check that all loose parts fall out of the pump.

Fig. 7

The non-return valve can be fitted in a Grundfos

service workshop.

Caution

The pressure switch must be rated for

the maximum amps of the specific

pump size.

TM01 1480 4697

Warning

Before starting any work on the pump/

motor, make sure that the power supply

has been switched off and that it cannot

be accidentally switched on.

Caution

Do not lower or lift the pump by means

of the motor cable.

Pressure switch

TM02 8425 5203TM01 2854 3804

Motor (P2)

[kW] L

[mm]

0.70 120

1.15 102

1.68 66

1.85 66

TM01 4337 0199

TM01 4338 0199

Note

SQE-NE is supplied without non-return

valve.

156 mm

English (GB)

6.4 Fitting the cable plug to the motor

The cable plug supplied with the motor is factory-

greased. Check that the plug is greased correctly.

To fit the cable plug, proceed as follows:

1. Check that the cable is of the correct type, cross-

section and length.

2. Check that the mains on the location has correct

connection to earth.

3. Check that the motor socket is clean and dry.

Make sure that the loose gasket has been fitted.

4. Press the cable plug onto the motor socket.

The plug cannot be fitted wrongly. See fig. 8.

Fig. 8

5. Fit and tighten the four screws (1 - 1.5 Nm).

See fig. 8.

When the plug has been fitted, there must not be a

clearance between the motor and the cable plug.

6.5 Fitting the cable guard

To fit the cable guard, proceed as follows:

1. Make sure that the submersible drop cable lies

flat in the cable guard.

2. Place the cable guard in the groove in the cable

plug. The two flaps of the cable guard must

engage with the upper edge of the pump sleeve.

See fig. 9.

Fig. 9

3. Fasten the cable guard to the pump suction

strainer with the two self-tapping screws

supplied. See fig. 10.

Fig. 10

Warning

The motor plug must under no

circumstances be removed by the user.

The following description is exclusively

intended for service personnel.

If the motor cable is to be replaced, see

section 5.1 General.

The cable with plug must be fitted or

removed by an authorised Grundfos

service workshop or a similarly qualified

person.

TM02 9605 3504

TM02 9613 3504TM01 4427 0299

English (GB)

6.6 Cable sizing

Grundfos can supply submersible drop cables for

any type of installation.

The table values below are calculated from the

following formula:

where

q = Cross-section of submersible drop cable

[mm2].

I = Rated maximum current of the motor [A].

PF = 1.0.

L = Length of submersible drop cable [m].

ρ= Specific resistance: 0.02 [Ωmm2/m].

U = Nominal voltage [V].

ΔU = Voltage drop [%] = 4 %.

The 4 % voltage drop is according to IEC 3-64,

HD-384 Series.

The calculation gives the following maximum cable

lengths at a supply voltage of 240 V:

6.7 Fitting the submersible drop cable

It is recommended to join the submersible drop cable

and the motor cable by means of a Grundfos cable

termination kit, type KM.

For larger cross-sections, please contact Grundfos.

Caution

The cross-section of the submersible

drop cable must be large enough to

meet the voltage requirements

specified in section 5.1 General.

q=I x 2 x 100 x PF x L x ρ

U x ΔU

Max. cable length [m]

Motor

(P2) INCable size

1.5 mm22.1 mm2/

14 AWG 2.5 mm23.3 mm2/

12 AWG 4 mm26 mm2

[kW] [A]

0.7 5.2 80 112 133 176 213 320

1.15 8.4 50 69 83 109 132 198

1.68 11.2 37 52 62 82 99 149

1.85 12 35 49 58 76 92 139

Cable termination kit, type KM

Cross-sectional area Product number

1.5 to 2.5 mm296021462

4.0 to 6.0 mm296021473

English (GB)

6.8 Pipework connection

If a tool, e.g. a chain pipe wrench, is used when the

riser pipe is fitted to the pump, the pump must only

be gripped by the pump discharge chamber.

When connecting plastic pipes, a compression

coupling should be used between the pump and the

first pipe section.

Where flanged pipes are used, the flanges should

be slotted to take the submersible drop cable.

Figure 11 shows a pump installation with indication of:

• position of cable clips, pos. 1, and distance

between the clips.

• fitting of straining wire, pos. 2.

• maximum installation depth below the static

water level.

Fig. 11

6.8.1 Cable clips

Cable clips must be fitted every 3 metres.

See fig. 11.

When connecting plastic pipes, some slackness

must be left between each cable clip as plastic pipes

expand when loaded.

Where flanged pipes are used, the cable clips

should be fitted above and below each joint.

6.8.2 Installation depths

Maximum installation depth below the static water

level: 150 metres. See fig. 11.

Minimum installation depths below the dynamic

water level:

•Vertical installation:

During start-up and operation, the pump must

always be completely submerged in water.

•Horizontal installation:

The pump must be installed and run at least

0.5 metres below the dynamic water level.

If there is a risk that the pump might be covered

by mud, the pump must always be fitted in a flow

sleeve.

6.8.3 When lowering the pump into the borehole

It is recommended to secure the pump by an

unloaded straining wire. See fig. 11, pos. 2.

Slacken the straining wire so that it becomes

unloaded and lock it to the borehole seal by means

of wire locks.

Note

For pumps fitted with plastic pipes, the

expansion of the pipes when loaded

should be taken into consideration,

when deciding on the installation depth

of the pump.

TM01 0480 4397

3 metres

Max.

150

metres

Caution

The straining wire must not be used for

pulling the pump with riser pipe out of

the borehole.

Caution

Do not lower or lift the pump by means

of the motor cable.

English (GB)

7. Start-up

Make sure that the well is capable of yielding a

minimum quantity of water corresponding to the

pump capacity.

Do not start the pump until it is completely

submerged in the liquid.

Start the pump and do not stop it until the pumped

liquid is completely clean, as otherwise the pump

parts and the non-return valve may choke up.

8. Operation

8.1 Minimum flow rate

To ensure the necessary cooling of the motor, the

pump flow rate should never be set to a value lower

than 50 l/h.

If the flow rate suddenly falls, the reason might be

that the pump is pumping more water than the

borehole can yield. The pump must be stopped and

the fault corrected.

8.2 Selection of diaphragm tank and

setting of precharge pressure and

pressure switch

As the pump has a built-in soft starter giving a run-up

time of 2 seconds, the pressure at the pressure

switch and diaphragm tank during starting will be

lower than the pump cut-in pressure set on the

pressure switch (pcut-in). This lower pressure is

called minimum pressure (pmin).

pmin is equal to the desired minimum pressure at the

highest tap + head and head loss in the pipe from the

pressure switch and diaphragm tank to the highest

tap (pmin = B + C). See fig. 12.

Fig. 12

A: Head + head loss from dynamic water level

to diaphragm tank.

B: Head + head loss from diaphragm tank to

highest tap.

C: Minimum pressure at highest tap.

ppre: Precharge pressure of diaphragm tank.

pmin: Desired minimum pressure.

pcut-in: Cut-in pressure set on pressure switch.

pcut-out: Cut-out pressure set on pressure switch.

Qmax: Maximum flow at pmin.

Caution

The pump dry-running protection is

effective only within the recommended

duty range of the pump.

Warning

The installation must be designed for

the maximum pump pressure.

TM00 6445 3795

Caution

Make sure that the selected pump can

deliver a pressure higher than pcut-out

+A.

ppre

pmin

pcut-in

pcut-out

Qmax

Diaphragm tank

Pressure

switch

English (GB)

Using pmin and Qmax, the minimum diaphragm tank size, precharge pressure and pressure switch settings

can be found in the guideline table below:

Example

pmin = 35 m head, Qmax = 2.5 m3/h.

On the basis of this information, the following values can be found in the table:

Minimum diaphragm tank size = 33 litres.

ppre = 31.5 m head.

pcut-in = 36 m head.

pcut-out = 50 m head.

1 m head = 0.098 bar.

8.3 Built-in protection

The motor incorporates an electronic unit which

protects the motor in various situations.

In case of overload, the built-in overload protection

will stop the pump for 5 minutes. After that period,

the pump will attempt to restart.

If the pump has been stopped as a result of dry

running, it will start automatically after 5 minutes.

If the pump is restarted and the borehole is empty,

the pump will stop after 30 seconds.

Resetting of the pump: Switch off the power supply

for 1 minute.

The motor is protected in case of:

• dry running

• voltage surges (up to 6000 V)

In areas with high lightning intensity, external

lightning protection is required.

• overvoltage

• undervoltage

• overload

• overtemperature.

SQE pumps/MSE 3 motors

9. Maintenance and service

The pumps are normally maintenance-free.

Deposits and wear may occur. For that purpose,

service kits and service tools are available from

Grundfos. The Grundfos Service Manual is available

on request.

The pumps can be serviced at a Grundfos service

centre.

9.1 Contaminated pumps

If Grundfos is requested to service the pump,

Grundfos must be contacted with details about the

pumped liquid, etc. before the pump is returned for

service. Otherwise Grundfos can refuse to accept

the pump for service.

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.

pmin

[m]

Qmax [m3/h]

ppre

[m] pcut-in

[m] pcut-out

[m]

0.6 0.8 1 1.2 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8

Diaphragm tank size [litres]

25 8 8 18 18 18 18 24 33 33 50 50 50 50 80 80 80 80 80 22.5 26 40

30 8 8 18 18 18 24 33 33 50 50 50 50 80 80 80 80 80 27 31 45

35 8 181818182433335050508080808080 31.5 36 50

40 8 1818181824335050508080808080 36 41 55

45 8 18181824333350505080808080 40.5 46 60

50 8 181818243350505080808080 45 51 65

55 18 18 18 18 24 33 50 50 50 80 80 80 49.5 56 70

60 18 18 18 18 24 33 50 50 80 80 80 80 54 61 75

65 18 18 18 24 24 33 50 50 80 80 80 80 58.5 66 80

Note

Via the CU 300 or CU 301, the dry-

running stop limit of the MSE 3 motors

can be adjusted to match the actual

application.

Note

If a pump has been used for a liquid

which is injurious to health or toxic,

the pump will be classified as

contaminated.

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