Grundfos CU 301 Bedienungsanleitung

CU 301

Installation and operating instructions

CU 301

Installation and operating instructions

(all available languages)

http://net.grundfos.com/qr/i/99406808

GRUNDFOS INSTRUCTIONS

CU 301

English (GB)

Installation and operating instructions ..................................4

Español (ES)

Instrucciones de instalación y funcionamiento............................30

Français (FR)

Notice d'installation et de fonctionnement...............................58

Table of contents

English (GB) Installation and operating instructions

Original installation and operating instructions

Table of contents

1. General information ............. 4

1.1 Hazard statements .............. 4

1.2 Notes ..................... 4

2. Installing the product ............ 5

2.1 Mechanical installation ............ 5

2.2 Electrical connection ............. 6

2.3 Positioning the pressure sensor ....... 7

2.4 Precharge pressure setting .......... 8

2.5 Pressure relief valve ............. 8

3. Product introduction ............ 8

3.1 Product description .............. 8

3.2 System sizing .................11

3.3 Intended use .................12

4. Control functions ..............13

4.1 On/off button .................13

4.2 Indication of pump operation .........13

4.3 Pressure setting................14

4.4 Button locking .................14

4.5 Alarm functions ................14

4.6 Service alarm .................15

4.7 Dry-running protection ............15

4.8 Position of LEDs ...............16

4.9 Grundfos GO Remote menu overview ....17

5. Setting the product .............18

5.1 CU 301 with Grundfos GO Remote .....18

5.2 Status .....................18

5.3 Settings ....................19

6. Servicing the product ............22

7. Fault finding the product ..........23

7.1 Fault finding with Grundfos GO Remote . ..23

8. Technical data ................27

9. Disposing of the product ..........29

10. Document quality feedback ........29

1. General information

Read this document before you install the

product. Installation and operation must

comply with local regulations and accepted

codes of good practice.

1.1 Hazard statements

The symbols and hazard statements below may

appear in Grundfos installation and operating

instructions, safety instructions and service

instructions.

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.

The hazard statements are structured in the following

way:

SIGNAL WORD

Description of the hazard

Consequence of ignoring the warning

• Action to avoid the hazard.

1.2 Notes

The symbols and notes below may appear in

Grundfos installation and operating instructions,

safety instructions and service instructions.

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.

English (GB)

2. Installing the product

DANGER

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.

‐Use the recommended fuse size.

‐Check that the supply voltage

corresponds to the values stated on

the nameplate.

‐The user or the installer is responsible

for correct earthing and protection

according to local regulations.

2.1 Mechanical installation

You can install CU 301 both indoors and outdoors.

The control unit must not be exposed to direct

sunlight.

2.1.1 Mounting CU 301

CU 301 is designed for wall mounting.

The box has six mounting holes (∅4). See fig.

Dimensions. The dimensions are in mm.

CU 301 must be mounted as follows:

• Horizontally to allow condensed water, if any, to

escape. See fig. Dimensions.

On a plane surface to avoid deformation of the box.

104.5

100

140.5

TM017864

Dimensions

CU 301 is supplied with special gaskets for the Pg

cable entries. The special gaskets are suitable for flat

cables and single-core cables.

English (GB)

2.2 Electrical connection

For recommended fuse sizes. See section

8. Technical data.

CU 301 has two terminal blocks:

• Screw terminals 1 to 4.

• Spring terminals 5 to 7.

Furthermore, CU 301 is equipped with two screw

terminals for the protective-earth conductors (PE).

The on/off button on CU 301 must not be used as a

safety switch when installing and servicing the pump.

POWER

PUMP

SENSOR

567

+24V IN GND

TM017720

Electrical connection of CU 301

Legend

Pos. Description

1Standard pressure sensor. + 24 VDC,

brown conductor, terminal 5.

2Standard pressure sensor. Input signal,

black conductor, terminal 6.

3Standard pressure sensor. Screen,

terminal 7.

4 Standard pressure sensor.

Related information

8. Technical data

2.2.1 Mains supply

POWER, terminals 1, 2 and PE

Connect terminals 1 and 2 to the phase and neutral

conductors of the mains supply. Each terminal can be

connected to any of the two conductors.

Connect the PE terminal to the green and yellow

earth conductor. Each PE terminal must be

connected to an earth conductor of its own.

Maximum cross-section of the conductors to be

connected is 6 mm2.

Back-up fuse: Maximum 16 A.

The conductors of the mains supply must

not be connected to terminals 3 and 4

(PUMP).

2.2.2 Pump supply

PUMP, terminals 3, 4 and PE

Connect terminals 3 and 4 to the phase and neutral

conductor of the pump. Each terminal can be

connected to any of the two conductors.

Connect the PE terminal to the green and yellow

earth conductor. Each PE terminal must be

connected to an earth conductor of its own.

Maximum cross-section of the conductors to be

connected is 6 mm2.

Pressure sensor

DANGER

Electric shock

Death or serious personal injury

‐The total load of terminal 5, +24 VDC,

must not exceed 100 mA.

SENSOR, terminals 5, 6 and 7:

Terminals 5, 6 and 7 (SENSOR) are used for the

pressure sensor.

Sensor signals:

The sensor to be connected must give signals within

one of the following ranges:

• 0-10 V.

• 2-10 V.

• 0-20 mA.

• 4-20 mA.

Changeover between current and voltage signals is

carried out by means of Grundfos GO Remote.

English (GB)

Operating relay

RELAY, terminals 8 and 9:

Terminals 8 and 9 (RELAY) are used for the

connection of an external signal transmitter (sound or

light).

The operating relay is a normally open (NO) contact

when the pump is not running, and closes while the

pump is running.

• Maximum current: 0.5 A.

• Maximum voltage: 230 VAC.

POWER PUMP

8 5

7 4

relpol

RM85-3021-25-1024

MADE IN POLAND

4080

AC 250 V 16 A

DC 24 V

5 6 7

+24V IN GND

8 5

7 4

relpol

RM85-3021-25-1024

MADE IN POLAND

4080

AC 250 V 16 A

DC 24 V

9 8

RELAY

Max. 0.5 A

8 5

7 4

relpol

RM85-3021-25-1024

MADE IN POLAND

4080

AC 250 V 16 A

DC 24 V

9 8

RELAY

Max. 0.5 A

SENSOR

TM070764

Electrical connection of the operating relay

2.3 Positioning the pressure sensor

Pressure losses often cause inconvenience to the

user. CU 301 keeps the pressure constant in the

place where the pressure sensor is positioned.

CU 301

TM017862

Pressure sensor position

Pos. Description

1 Tap 1

2 Tap 2

3 Pressure sensor

In fig. Pressure sensor position, tap 1 is placed close

to the pressure sensor. Therefore, the pressure is

kept nearly constant at tap 1, as the friction loss is

small. At the shower and tap 2, the friction loss is

bigger. This, of course, depends on the pipes.

However, old and furred-up pipes may cause

inconvenience due to friction loss.

Example: A person is in the shower. Tap 2 is opened.

The increased flow causes pressure loss in the pipe,

and even though CU 301 is keeping the pressure

constant at the pressure sensor, the person in the

shower feels the pressure loss.

If the pressure sensor is placed closer to the shower

tap, CU 301 increases the pressure when the flow

rate is increased. Then the pressure at the shower

and tap 2 is kept constant, but the pressure at tap 1 is

increased.

We recommend that the pressure sensor is

positioned as close to the places of consumption as

possible.

Related information

7.1 Fault finding with Grundfos GO Remote

English (GB)

2.4 Precharge pressure setting

The precharge pressure of the diaphragm tank must

be set to 70 % of the pressure setting in order to use

the tank to the limit of its capacity. This is of course

especially important when the tank volume is limited

to 8 litres.

Use the values in the following table:

Setting

[bar]

Precharge pressure

[bar]

2 1.4

2.5 1.8

3 2.1

3.5 2.5

4 2.8

4.5 3.2

5 3.5

If the precharge pressure is higher than the pressure

setting, the system is not able to control the pressure.

If the user wants to adjust the pressure without

changing the precharge pressure of the diaphragm

tank, the precharge pressure must be equal to the

lowest pressure setting used. This means that the

control works but that the pressure fluctuations might

increase. In such cases, we recommend that you use

a larger diaphragm tank, for example a tank of double

size.

2.5 Pressure relief valve

In order to provide protection against the possibility of

an overpressurization, a pressure relieve valve must

be installed down stream of the well head. The

setpoint of the pressure relief valve must be at least

30 psi above the pressure setting. See section

5. Setting the product.

If a relief valve is installed, we recommend that its

outlet is plumbed into an appropriate drainage point.

3. Product introduction

3.1 Product description

The system maintains a constant pressure within the

maximum pump performance in spite of a varying

water consumption.

Figure Example installation shows an example of an

installation with constant-pressure control.

TM080250

Example installation

Pos. Description

1 CU 301

2 Diaphragm tank

3 Pressure sensor

4 SQE pump

The pressure is registered by means of the pressure

sensor, which transmits a signal to CU 301. CU 301

adjusts the pump performance accordingly by

changing the pump speed.

Mains borne signalling

The communication between CU 301 and the pump is

effected via the power cable.

This communication principle is called mains borne

signalling, or power line communication. Using this

principle means that no additional cables to the pump

are required.

The communication of data is effected by means of a

high-frequency signal transmitted to the power cable

and led into the electronics unit by means of signal

coils incorporated in the motor and CU 301

respectively.

In situations where multiple CU 301 pump power

cables are run parallel in wiring trays or conduit and

less than 25-30 cm apart, the possibility for undesired

communication between units exists. When this

occurs, intermittent or continuous "No contact" is

typically seen. Other unexpected errors may also be

seen.

English (GB)

Figure Principle of mains borne signalling (power line

communication) shows the principle of mains borne

signalling between CU 301 and the pump.

CU 301

TM070560

Principle of mains borne signalling (power line

communication)

Pos. Description

1 Supply to the electronics

2 Signal coils

3 Capacitor

4Electronics for the control of the

communication

5 On/off button

6 Sensor signal

7 Power supply

8 Communication signals

9 Grundfos GO Remote

When does the pump start

The pump starts as a consequence of the following:

• a high flow

• a low pressure

• a combination of both.

To ensure that the pump starts when water is

consumed, a flow detection is required. The flow is

detected via pressure changes in the system. When

water is consumed, the pressure drops accordingly

depending on the size of the diaphragm tank and the

water flow:

• at a low flow, the pressure drops slowly.

• at a high flow, the pressure drops quickly.

TM018545

Pos. Description

1 Pressure

2 Low flow

3 Time

4 High flow

When the pressure drops 0.1 bar/s or faster, the

pump starts immediately.

If a diaphragm tank of 8 litres is used, the pump starts

at a flow rate of approximately 0.18 m3/h. If a larger

tank is used, the flow must be higher before the pump

starts.

Consumption up to 0.18 m3/h

The pump starts when the pressure drops to 0.5 bar

below the pressure setting.

The pump runs until the pressure is 0.5 bar above the

pressure set.

Flow detection

During pump operation, meaning when water is

consumed, CU 301 adjusts the pump speed to

maintain a constant pressure. In order to stop the

pump when no water is consumed, CU 301 performs

flow detection every 10 seconds.

English (GB)

The pump speed is reduced until a small pressure

drop is registered. This pressure drop indicates that

water is consumed and the pump speed is resumed.

See fig. Flow detection every 10 seconds during

operation.

If the pump speed reduces without any pressure drop

being registered, this indicates that no water is

consumed. The diaphragm tank is filled with water

and the pump stops.

10 s 10 s

TM018546

Flow detection every 10 seconds during operation

Pos. Description

1 Flow detection

2 Pressure

3 Time

System limits

Even though, CU 301 controls the pressure within ±

0.2 bar, bigger pressure variations may occur in the

system. If the consumption is suddenly changed, for

example if a tap is opened, the water must start

flowing before the pressure can be made constant

again. Such dynamic variations depend on the pipes,

but, typically, they will lie between 0.5 and 1 bar.

If the desired consumption is higher than the quantity

the pump is able to deliver at the desired pressure,

the pressure follows the pump curve as illustrated in

fig. Possible pressure variations during constant-

pressure operation.

345

TM018634

Possible pressure variations during constant-

pressure operation

Pos. Description

1Stop

+ 0.5 bar

2 Pressure

3Start

- 0.5 bar

4 Controlling ± 0.2 bar

5 Dynamic variations ± 0.5 bar

6 Flow

7 0.18

8m3/h

A Pressure set

English (GB)

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