Grundfos CU 300 Bedienungsanleitung

CU 300

Installation and operating instructions

No contact

Overvoltage

Undervoltage

Dry running

Speed reduction

Overtemperature

Overload

Sensor alarm

CU 300

Installation and operating instructions

http://net.grundfos.com/qr/i/96427972

GRUNDFOS INSTRUCTIONS

English (GB) Installation and operating instructions

Original installation and operating instructions

Table of contents

1. General information ............. 5

1.1 Hazard statements .............. 5

1.2 Notes ..................... 5

2. General .................... 6

2.1 Expansion possibilities ............ 6

2.2 On/Off button ................. 6

3. Mechanical installation ........... 7

3.1 Location .................... 7

3.2 Mounting CU 300 ............... 7

4. CU 300 as an alarm unit........... 7

4.1 Description .................. 7

4.2 Electrical installation ............. 8

4.3 Description of dry-running protection..... 9

4.4 Settings ....................10

4.5 Description of the dewatering function ....10

5. CU 300 with constant-pressure control

- 0 to 6 bar ..................12

5.1 Description ..................12

5.2 Function ....................12

5.3 Positioning the pressure sensor .......14

5.4 System sizing .................14

5.5 Electrical installation .............15

5.6 Startup.....................16

6. CU 300 with constant-pressure control

- 0 to 10 bar..................17

6.1 Description ..................17

6.2 Function ....................17

6.3 Positioning the pressure sensor .......18

6.4 System sizing .................18

6.5 Electrical installation .............19

6.6 Startup.....................20

7. CU 300 with constant-pressure control

- two-pump operation ............21

7.1 Description ..................21

7.2 Function ....................21

7.3 Positioning the pressure sensor .......22

7.4 System sizing .................22

7.5 Electrical installation .............23

7.6 Startup.....................24

8. CU 300 with sensors ............25

8.1 General ....................25

8.2 Sensor functioning ..............26

8.3 Electrical installation .............27

9. CU 300 connected to potentiometer ....29

9.1 Description ..................29

9.2 Electrical installation .............30

10. CU 300 connected to water meter .....31

10.1 Description ..................31

10.2 Electrical installation .............32

11. Constant water level ............33

11.1 Description ..................33

11.2 Function ....................33

11.3 Electrical installation .............34

12. CU 300 connected to RS-485 ........36

12.1 Description ..................36

12.2 CU 300 connected to a PC directly......36

12.3 Electrical installation .............37

13. Alarm functions ...............39

13.1 No contact...................39

13.2 Overvoltage ..................39

13.3 Undervoltage .................40

13.4 Dry running ..................40

13.5 Speed reduction................41

13.6 Overtemperature ...............41

13.7 Overload ...................42

13.8 Sensor alarm .................42

14. CU 300 with Grundfos GO .........43

14.1 Menu overview ................44

15. Description of functions ..........46

15.1 Status .....................46

15.2 Settings ....................47

15.3 Alarms and warnings .............52

16. Technical data ................53

17. Disposing of the product ..........55

18. Document quality feedback ........55

English (GB)

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.

This appliance can be used by children

aged from 8 years and above and persons

with reduced physical, sensory or mental

capabilities or lack of experience and

knowledge if they have been given

supervision or instruction concerning use

of the appliance in a safe way and

understand the hazards involved.

Children shall not play with the appliance.

Cleaning and user maintenance shall not

be made by children without supervision.

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. General

The control unit CU 300 is developed for the SQE

submersible pumps.

CU 300 covers the voltage range 1 x 100-240 V - 10

%/+ 6 %, 50/60 Hz, PE.

CU 300 has the following functions:

• control of the pump on the basis of sensor signals

• setting of operating parameters

• monitoring of operation and alarm indication, if

any.

CU 300 indicates the following alarms:

• no contact

• overvoltage

• undervoltage

• dry running

• speed reduction

• overtemperature

• overload

• sensor alarm.

The individual alarms are described in details in

section 13. Alarm functions.

CU 300 receives alarm signals from the motor for the

following parameters:

• dry running

• incipient pump or motor defect

• too high temperature in motor electronics

• supply failure.

As standard, CU 300 incorporates an alarm signal

relay.

2.1 Expansion possibilities

CU 300 enables the use of the following devices:

•Grundfos GO:

Wireless infra-red remote control that enables

change of factory settings and monitoring of the

installation by calling up actual operating data,

e.g. speed, operating hours and power

consumption.

•External sensors:

Reception of data from external sensors and

control according to the data received, e.g. flow

rate, pressure, water level and conductivity.

•External potentiometer SPP 1:

Manual speed control.

Related information

15.2.8 External setpoint

2.2 On/Off button

By means of the On/Off button on CU 300, you can

do the following:

• Start or stop the pump.

• Reset alarms.

TM012829

Pos. Description

1 Green

2 Red

The green and red indicator lights in the On/Off button

indicate pump operating condition as follows:

Indication Description

Green indicator light

permanently on Pump is operating

Green indicator light

flashing

Pump has been stopped by

one of the following:

• a sensor

• an external on/off switch

• a stop command from the

Grundfos GO

Red indicator light

permanently on

Pump has been stopped by

means of the On/Off button *

Red indicator light

flashing

CU 300 is communicating

with the Grundfos GO

*If you use the On/Off button to stop the pump, you must also

use this button for restarting the pump.

If you press the On/Off button for minimum 5 seconds, you

start the pump, irrespective of any active fault or alarm

indications. When you release the On/Off button, the pump

will stop.

English (GB)

3. Mechanical installation

WARNING

Electric shock

Death or serious personal injury

‐Before starting any work on CU 300,

make sure that the power supply has

been switched off and that it cannot be

accidentally switched on.

3.1 Location

You can place CU 300 both indoors and outdoors.

The control unit must not be exposed to direct

sunlight.

3.2 Mounting CU 300

CU 300 is designed for wall mounting.

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

Dimensions. The dimensions are in mm.

CU 300 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

TM012824

Dimensions

CU 300 is supplied with a set of gaskets for the Pg

screwed connections.

The gaskets are to be used for the connection of

cables or wires to ensure tight connections, IP55, and

cable relief.

4. CU 300 as an alarm unit

4.1 Description

When CU 300 is connected to an SQE pump, one of

the eight red indicator lights on CU 300 will indicate

any alarm.

The indications are based on signals from the motor

and from sensors, if installed. The individual alarms

are described in details in section 13. Alarm

functions.

You can connect an external alarm-signal transmitter

and an external on/off switch. See section

4.2 Electrical installation concerning connection, etc.

Figure CU 300 as an alarm unit shows an example of

an installation with CU 300 as an alarm unit.

TM013150

CU 300 as an alarm unit

CU 300 functions as an alarm unit for the pump.

Furthermore, you can communicate with the pump via

the remote control Grundfos GO, see also section

14. CU 300 with Grundfos GO.

Related information

4.2 Electrical installation

14. CU 300 with Grundfos GO

English (GB)

4.2 Electrical installation

WARNING

Electric shock

Death or serious personal injury

‐Never make any connections in the CU 300 unit unless the power supply has been switched off.

CU 300 must be connected in accordance with the rules and standards in force for the application

in question.

The supply voltage and frequency are marked on the nameplate. Make sure that CU 300 is suitable for the

power supply on which it will be used.

POWER

PUMP

RELAY

ALARM

COM

AUX

RELAY

DI G

+24VDC

GND

+24VDC

SENSOR

1 2

SENSOR

+24VDC

GND

485

232

GND

DTR

RXD

GND

5 6 7

1 2

1098

3 4

111213 161514 171819

TXD

LNL N

HS1

TM013067

Electrical installation - CU 300 as alarm unit

Pos. Description

S1 On/off switch for start or stop of pump

H Alarm signal transmitter (optional)

K1 Internal alarm signal relay

Relay data: 250 VAC, 1 A, AC1

Related information

4.1 Description

4.2.1 Mains supply

POWER, terminals 1, 2 and PE

Connect terminals 1 and 2 to the phase and neutral

leads of the mains supply. You can connect each

terminal to any of the two leads.

Connect the PE terminal to the green/yellow earth

lead. You must connect each PE terminal to an earth

lead of its own.

The maximum cross-section of the leads to be

connected is 6 mm2.

Backup fuse: Maximum 16 A.

You must not connect the leads of the

mains supply to terminals 3 and 4.

English (GB)

4.2.2 Pump supply

PUMP, terminals 3, 4 and PE

Connect terminals 3 and 4 to the phase and neutral

leads of the pump. You can connect each terminal to

any of the two leads.

Connect the PE terminal to the green/yellow earth

lead. You must connect each PE terminal to an earth

lead of its own.

The maximum cross-section of the leads to be

connected is 6 mm2.

4.2.3 Alarm signal relay

ALARM RELAY, terminals 5, 6 and 7

Connect terminals 5, 6 and 7 to the internal alarm

signal relay as follows:

• Terminal 5 NC (normally closed).

• Terminal 6 COM (common).

• Terminal 7 NO (normally open).

The relay is activated when the alarm and warning

limits are exceeded.

You can select manual or automatic restarting in the

Grundfos GO display "Automatic restarting".

Manual restarting is carried out by means of the

On/Off button on CU 300.

4.2.4 Digital input

DIG IN, terminals 11, 12 and 13

In fig. Electrical installation - CU 300 as alarm unit,

the digital input is used to start and stop the pump.

You can select the function of the digital input by

means of the Grundfos GO in the display "Digital

input".

4.3 Description of dry-running protection

When the pump sucks air, the pump power input

decreases.

If the pump power input falls below the dry-running

power limit set in the Grundfos GO display "Dry-

running stop", the pump will stop and CU 300 will

indicate the dry-running alarm.

Related information

15.2.20 Dry-running protection

4.3.1 Function

The dry-running protection applies only if the motor

speed lies within the maximum speed range (i.e.

maximum speed less than 1000 min-1). See fig. Pump

power input curve.

Normally, maximum speed is 10,700 min-1. However,

you can reduce the maximum speed in the Grundfos

GO display "Maximum speed". The dry-running power

limit set in the display "Dry-running stop" must match

the speed.

Changing the setpoint:

If you use the Grundfos GO display "Setpoint" or

"External setpoint" to change the setpoint, the pump

can be forced to run at a reduced speed in relation to

the maximum speed. The dry-running protection will

not protect the pump if the reduced speed lies outside

the maximum speed range (i.e. maximum speed less

1000 min-1). See fig. Pump power input curve.

Constant-pressure control

In constant-pressure control mode, the dry-running

protection is active, as the motor will operate at

maximum speed in connection with dry running.

Pump power input curve

The curve shows the pump power input in relation to

the pump speed.

12345

TM012689

Pump power input curve

Pos. Description

13000 min-1

2Max. speed -1000 min-1

3Max. speed as set in section Maximum

speed

410,700 min-1

5 Motor speed

6 Pump power input [Watt]

7 Pump power curve

8 Dry-running power limit set

Related information

15.2.22 Maximum speed

15.2.3 Setpoint

English (GB)

4.4 Settings

For a detailed description of the Grundfos GO

displays, see section 14. CU 300 with Grundfos GO.

4.4.1 Required Grundfos GO settings

If the maximum speed of the pump has been reduced

by more than 1000 min-1, the dry-running stop value

must be changed. In order to change the dry-running

protection function, you must make the following

Grundfos GO settings.

1. Set "Dry-running protection" to "Active".

In certain installations, it may be

necessary to disable the dry-running

protection. The disabling applies to the

dry-running power limit set in the

display Dry-running stop. See fig.

Pump power input curve.

Set the dry-running power limit in the display Dry-

running stop by following the procedure below:

• Start the pump against a closed discharge pipe.

• Read the input power (P1) in the display Power

consumption.

• Calculate the dry-running power limit: P1 x 0.9

[W].

• Set this value in the display Dry-running stop.

Related information

15.1.9 Power consumption

15.2.21 Dry-running stop

4.5 Description of the dewatering function

When the pump sucks air, the pump power input

decreases.

If the pump power input falls below the dry-running

power limit set in the display 15.2.21 Dry-running

stop, the pump will stop.

During dewatering, the green indicator light in the

On/Off button on CU 300 is flashing to indicate that

the pump has stopped.

Related information

15.2.21 Dry-running stop

15.2.18 Dewatering

15.2.19 Dewatering, maximum "On" and "Off" time

15.2.21 Dry-running stop

4.5.1 Applications

You can use the dewatering function in applications

where the pump often runs dry, e.g.:

• In boreholes with a low yield.

• In boreholes and building sites where the water

table should be lowered.

4.5.2 Function

The dewatering function works as follows:

1. The pump is operating.

2. The pump sucks air due to a drop in the water

level.

3. The load decreases, and consequently the pump

power input does as well.

4. The pump stops when the power input falls to the

dry-running power limit set in the Grundfos GO

display Dry-running stop.

The length of the stop time depends on

the setting you have made in the

Grundfos GO display "Dewatering max

off time". See section Dewatering,

maximum "On" and "Off" time.

Related information

15.2.21 Dry-running stop

15.2.19 Dewatering, maximum "On" and "Off" time

4.5.3 Required Grundfos GO settings

In order to activate the dewatering function, you must

make the following Grundfos GO settings:

1. Set "Dry-running protection" to "Active".

2. Set the dry-running power limit, i.e. dry-running

stop. See "Setting of dry-running power limit (dry-

running stop)" below.

3. Set the relation between run and stop times.

Indication of operation:The dry-running alarm

indication on CU 300 is automatically disabled,

when you make the setting in the display

Dewatering, maximum "On" and "Off" time.

To disable the dewatering function and return to

dry-running protection, simply disable the

"Dewatering" function in the display Dewatering.

Setting of dry-running power limit (dry-running

stop):

1. Start the pump against a closed discharge pipe.

2. Read the input power (P1) in the display Power

consumption.

3. Calculate the dry-running power limit: P1 x 0.9

[W].

4. Set this value in the display Dry-running stop.

Related information

15.1.9 Power consumption

15.2.21 Dry-running stop

15.2.19 Dewatering, maximum "On" and "Off" time

15.2.18 Dewatering

English (GB)

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