Grundfos MTH Series Bedienungsanleitung

MTH

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

English (GB)

English (GB) Installation and operating instructions

Original installation and operating instructions

These installation and operating instructions

describe Grundfos MTH.

Sections 1-3 give the information necessary to be

able to unpack, install and start up the product in a

safe way.

Sections 4-8 give important information about the

product, as well as information on service, fault

finding and disposal of the product.

CONTENTS

Page

1. General information

1.1 Hazard statements

The symbols and hazard statements below may

appear in Grundfos installation and operating

instructions, safety instructions and service

instructions.

The hazard statements are structured in the

following way:

1. General information 2

1.1 Hazard statements 2

1.2 Notes 3

2. Installing the product 3

2.1 Mechanical installation 3

2.2 Tank mounting 3

2.3 Inlet conditions 5

2.4 Electrical connection 5

3. Starting up the product 7

3.1 Operating the product 7

4. Product introduction 7

4.1 Applications 7

4.2 Identification 7

5. Servicing the product 8

5.1 Contaminated products 9

5.2 Maintaining the product 9

5.3 Filters 9

5.4 Periodic checks 9

6. Fault finding the product 10

7. Technical data 11

7.1 Operating conditions 11

7.2 Sound pressure level 11

8. Disposing of the product 11

Read this document before installing the

product. Installation and operation must

comply with local regulations and accepted

codes of good practice.

DANGER

Indicates a hazardous situation which, if

not avoided, will result in death or serious

personal injury.

WARNING

Indicates a hazardous situation which, if

not avoided, could result in death or

serious personal injury.

CAUTION

Indicates a hazardous situation which, if

not avoided, could result in minor or

moderate personal injury.

SIGNAL WORD

Description of hazard

Consequence of ignoring the warning.

- Action to avoid the hazard.

English (GB)

1.2 Notes

The symbols and notes below may appear in

Grundfos installation and operating instructions,

safety instructions and service instructions.

2. Installing the product

2.1 Mechanical installation

2.2 Tank mounting

The pump is designed for tank mounting in vertical

position. The pump is positioned in a hole cut into

the cover of the tank (upper side) and is secured to

the tank by four hexagon head screws through the

holes in the mounting flange. We recommend that

you fit a sealing gasket between the pump flange

and tank.

Fig. 1 Pump mounting position

2.2.1 Filtration requirements

A filtration system must be installed in the tank

system to avoid that impurities in the liquid block the

pump.

Fig. 2 Example of a filtration system

Observe these instructions for explosion-

proof products.

A blue or grey circle with a white graphical

symbol indicates that an action must be

taken.

A red or grey circle with a diagonal bar,

possibly with a black graphical symbol,

indicates that an action must not be taken

or must be stopped.

If these instructions are not observed, it

may result in malfunction or damage to the

equipment.

Tips and advice that make the work easier.

CAUTION

Hot or cold surface

Minor or moderate personal injury

- Make sure that no one can accidentally

come into contact with hot or cold

surfaces.

MTH pumps must only be mounted

vertically.

TM07 0452 5117

TM07 0521 0118

English (GB)

2.2.2 Bypass pipe

Fig. 3 Example of a bypass pipe (A)

2.2.3 Installation dimensions

Fig. 4 Installation dimensions

Pump mounting flange dimensions

Fig. 5 Dimensional sketch

To reduce the risk of water hammer

damaging the pump, we recommend that

you install a bypass line.

TM07 0453 5117TM07 0454 5117

Measurement Dimension

B Depending on pump type.

C Depending on motor type.

X1 200 mm

X2 150 mm

This measurement must be at

least 30 mm longer than

measurement B to allow sufficient

space for removing the pump in

case of service and maintenance.

BY1C

TM00 4375 5298

Pump

type D1 D2 D3 L C X

MTH 2,

4 and 8 140 160 180 121 Rp 3/4 ∅7.5

MTH 10

and 15 180 210 250 132 Rp/G 1 1/4 ∅9

4 x X

English (GB)

2.3 Inlet conditions

The bottom of the pump strainer must be at least 25

mm above the bottom of the tank. See fig. 6 or 7.

MTH pumps must be installed vertically, and the

drain hole in the motor stool must have access to the

tank.

The pumps are designed to provide full performance

down to a level of A mm above the bottom of the

strainer.

At a liquid level between A and B mm above the

bottom of the strainer, the built-in priming screw will

protect the pump against dry running.

Fig. 6 MTH 2, 4 and 8

Fig. 7 MTH 10 and 15

2.4 Electrical connection

Operating voltage and operating frequency are

stated on the motor nameplate. Check that the motor

is suitable for the power supply available at the

installation site.

The voltage quality for MG motors, measured at the

motor terminals, must be ± 10 % of the rated voltage

during continuous operation (including variation in

the supply voltage and losses in cables).

The electrical installation must be carried out by

authorised persons in accordance with local

regulations.

The wiring diagram is located in the terminal box

cover.

The terminal box of single-speed motors normally

contains six winding terminals and at least one earth

terminal.

Single-phase motor

Connect single-phase motors to the mains in

accordance with the instructions located in the

terminal box cover.

Three-phase motor

Three-phase motors can be connected in star (Y) or

delta (D) according to IEC 60034-8. See the wiring

diagram in the terminal box cover.

Voltage and connection are stated on the nameplate.

Example: 220-240 V D / 380-415 V Y

• If the voltage supply is 220-240 V, the motor must

be connected in delta.

• If the voltage supply is 380-415 V, the motor must

be connected in star.

Pump type A [mm] B [mm]

MTH 2, 4 and 8 37 25

MTH 10 and 15 40 28

TM07 0291 4717TM07 0290 4717

25mm

WARNING

Electric shock

Death or serious personal injury

- Before starting any work on the product,

make sure that the power supply has

been switched off and that it cannot be

accidentally switched on. Connect the

pump to an external main switch close

to the pump and to a motor-protective

circuit breaker or a CUE frequency

converter.

- Make sure you can lock the main switch

in OFF position (isolated). Type and

requirements as specified in EN 60204-

1, 5.3.2.

English (GB)

2.4.1 Torque for terminal box cover screws

Torque: 1.6 - 2 Nm.

2.4.2 Motor protection

Single-phase motors

Single-phase motors are supplied with built-in

thermal protection, according to IEC 60034-11,

against thermal overload with both rapid and slow

variation.

Three-phase motors

Three-phase motors must be protected by a motor-

protective circuit breaker according to local

regulations.

MG motors of 3.0 kW or up are supplied with thermal

switches (PTC) as standard and are protected

against thermal overload with both rapid and slow

variation. The motor protection is stated on the

nameplate.

2.4.3 Terminal box positions

The terminal box can be turned to three positions, in

90° steps, see fig. 8.

Proceed as follows:

1. Remove the four bolts securing the motor to the

motor stool.

2. Turn the motor to the required position.

3. Replace and tighten the four bolts.

The electric motor must be connected to the supply

as shown in the diagram inside the terminal box

cover.

Fig. 8 Terminal box positions, top view

2.4.4 Plug connections

The pumps can be fitted with a 10-pin multiplug

connection, type Han® 10 ES.

The purpose of a multiplug connection is to make the

electrical installation and the service of the pump

easier.

Fig. 9 Multiplug connection on a Grundfos

motor

Fig. 10 Connections between motor terminals

and plug terminals

Fig. 11 Plug connections for star connection

Fig. 12 Plug connections for delta connection,

fishplates for connections are located in

the plug

TM02 7777 2513

Position 6

o'clock

Position 9

o'clock

Position 12

o'clock

Position 3

o'clock

TM05 8900 2813TM01 8702 0700TM01 8703 0700TM01 8704 0700

678910

12345

W2 U2 V2

U1 V1 W1

12345

678910

L1 L2 L3

123

678910

L1 L2 L3

English (GB)

2.4.5 Frequency converter operation

Motors supplied by Grundfos

All three-phase motors supplied by Grundfos can be

connected to a frequency converter.

Depending on the frequency converter type, this may

cause increased acoustic noise from the motor.

Furthermore, it may cause the motor to be exposed

to detrimental voltage peaks.

We recommend to protect all other motors against

voltage peaks higher than 850 V.

The above disturbances, that is both increased

acoustic noise and detrimental voltage peaks, can be

eliminated by fitting an LC filter between the

frequency converter and the motor.

For further information, please contact the frequency

converter supplier or Grundfos.

3. Starting up the product

Before starting the pump, make sure:

• that all pipe connections are tight

• that the pump body is partly filled with liquid

(partly submerged)

• that the strainer is not blocked by impurities.

Start the pump as follows:

1. Close the isolating valve on the outlet side of the

pump.

2. See the correct direction of rotation of the pump

on the motor fan cover. When seen from the top,

the pump must rotate counterclockwise.

3. Start the pump and check the direction of

rotation.

4. Slowly open the outlet valve until it is completely

open.

The pump has now been vented and is ready for

operation.

3.1 Operating the product

4. Product introduction

4.1 Applications

Grundfos pumps, type MTH, are multistage

centrifugal pumps designed for pumping liquids for

machine tools, condensate transfer, liquid transfer in

industrial washing machines and similar

applications.

The pumps are designed for pumping liquids with a

density and viscosity corresponding to those of

water. The pumped liquid must not contain abrasive

particles or fibres.

When pumping liquids with a density or viscosity

higher than that of water, the motor size must be

taken into consideration.

4.2 Identification

4.2.1 Type designation

The standard range consists of pumps with several

impeller and chamber combinations. On request,

other pump lengths can be supplied by fitting empty

intermediate chambers in combination with standard

impellers and chambers.

The type key on the pump nameplate indicates the

number of chambers and impellers fitted to the

pump.

Grundfos motors, types MG 71 and MG 80

as well as MG 90 (1.5 kW, 2-pole), for

supply voltages up to and including 440 V

(see motor nameplate), must be protected

against voltage peaks higher than 650 V

(peak value) between the supply terminals.

CAUTION

Fire and explosion

Minor or moderate personal injury

- Do not use the pump for flammable,

combustible or explosive liquids.

CAUTION

Hot liquid

Minor or moderate personal injury

- Do not run the pump against a closed

valve for more than approximately 5

minutes.

The pump is not allowed to run against a

closed outlet valve for more than

approximately 5 minutes as this will cause

an increase in temperature and formation

of steam in the pump which may cause

damage to the pump.

English (GB)

4.2.2 Type key 5. Servicing the product

Example MTH 2 -6 /3 -A -W -A -A QQ V

Pump type

Rated flow rate [m3/h]

Number of chambers

Number of impellers

Pump version

A Basic version

C Inlet pipe

X Special version

Pipe connection

W Internal thread

WB NPT internal thread

Materials

A Basic version

I Stainless steel pump head

Shaft seal

A O-ring seal with fixed seal driver

B Bellows seal, rubber

C O-ring seal with spring as seal driver

R O-ring seal, type A, with reduced

seal faces

A Carbon, metal-impregnated

B Carbon, resin-impregnated

Q Silicon carbide

U Tungsten carbide

V Metal oxides, ceramic

E EPDM

VFKM

WARNING

Electric shock

Death or serious personal injury

- Before starting any work on the product,

make sure that the power supply has

been switched off and that it cannot be

accidentally switched on.

- Connect the pump to an external main

switch close to the pump and to a

motor-protective circuit breaker or a

CUE frequency converter.

- Make sure you can lock the main switch

in OFF position (isolated). Type and

requirements as specified in EN 60204-

1, 5.3.2.

CAUTION

Toxic liquids

Death or serious personal injury

- Wear personal protective equipment.

CAUTION

Hot or cold liquid

Minor or moderate personal injury

- Wear personal protective equipment.

CAUTION

Hot or cold surface

Minor or moderate personal injury

- Make sure that no one can accidentally

come into contact with hot or cold

surfaces.

English (GB)

5.1 Contaminated products

The product will be classified as contaminated if it

has been used for a liquid which is injurious to health

or toxic.

If you request Grundfos to service the product,

contact Grundfos with details about the liquid before

returning the product for service. Otherwise,

Grundfos can refuse to accept the product for

service.

Any application for service must include details

about the liquid.

Clean the product in the best possible way before

you return it.

5.2 Maintaining the product

Pumps installed in accordance with these

instructions require very little maintenance.

Shaft seal

The mechanical shaft seal is self-adjusting and has

wear-resistant seal rings which are lubricated and

cooled by the pumped liquid.

Pump bearings

The pump bearings are also lubricated by the

pumped liquid.

Motor bearings

The motor ball bearings are grease packed and

sealed for life. No further lubrication is necessary.

Pumps from 4 kW and up have angular contact

bearings.

5.3 Filters

Chip trays, filters, etc. must be cleaned at regular

intervals to ensure a correct flow of liquid.

5.4 Periodic checks

At regular intervals, depending on the conditions and

time of operation, the following checks must be

made:

• Check the quantity of liquid and operating

pressure.

• Check that there are no leaks.

• Check that the motor is not overheating.

• Check the tripping of the motor-protective circuit

breaker.

• Check that all controls are operating

satisfactorily.

If the above checks do not reveal any abnormal

operating details, no further checks are necessary.

Should any faults be found, check the symptoms in

section 6. Fault finding the product.

English (GB)

6. Fault finding the product

WARNING

Electric shock

Death or serious personal injury

- Before starting any work on the product,

make sure that the power supply has

been switched off and that it cannot be

accidentally switched on.

- Connect the pump to an external main

switch close to the pump and to a

motor-protective circuit breaker or a

CUE frequency converter.

- Make sure you can lock the main switch

in OFF position (isolated). Type and

requirements as specified in EN 60204-

1, 5.3.2.

CAUTION

Toxic liquids

Death or serious personal injury

- Wear personal protective equipment.

CAUTION

Hot or cold liquid

Minor or moderate personal injury

- Wear personal protective equipment.

CAUTION

Hot or cold surface

Minor or moderate personal injury

- Make sure that no one can accidentally

come into contact with hot or cold

surfaces.

Fault Cause Remedy

1. The motor does

not run when

started.

a) Supply failure. Connect the electricity supply.

b) The fuses are blown. Replace fuses.

c) The motor-protective circuit breaker

overload has tripped.

Reactivate the motor-protective circuit

breaker.

d) The main contacts in the motor-

protective circuit breaker are not

making contact or the coil is faulty.

Replace contacts or magnetic coil.

e) The control circuit is defective. Repair the control circuit.

f) The motor is defective. Replace the pump.

2. The motor-

protective circuit

breaker overload

trips immediately

when the supply

is switched on.

a) One fuse is blown or the motor-

protective circuit breaker has tripped.

Replace the fuse or reactivate the

motor-protective circuit breaker.

b) The contacts in the motor-protective

circuit breaker overload are faulty.

Replace the motor-protective circuit

breaker contacts.

c) The cable connection is loose or

faulty.

Fasten or replace the cable

connection.

d) The motor winding is defective. Replace the pump.

e) The pump is mechanically blocked. Remove the mechanical blocking of

the pump.

f) The overload setting of the motor-

protective circuit breaker is too low.

Set the motor-protective circuit breaker

correctly.

3. The motor-

protective circuit

breaker overload

trips occasionally.

a) The overload setting of the motor-

protective circuit breaker is too low.

Set the motor-protective circuit breaker

correctly.

b) The voltage is low at peak times. Check the electricity supply.

4. The motor-

protective circuit

breaker has not

tripped but the

pump does not

run.

a) Check 1 a), b), d) and e).

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