Grundfos CU 3x4 User manual

CU 3X2, CU 3X4

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

English (GB)

English (GB) Installation and operating instructions

Original installation and operating instructions

CONTENTS

Page

1. Symbols used in this document

2. Product description

The CU 3X2 is a flexible control unit for control and

monitoring of up to six pumps. In the following

sections two variants will be described:

• CU 352

– Water supply and booster systems

– Heating and air-conditioning systems.

• CU 362

– Wastewater and draining applications.

In the following the two variants will be designated

CU 3X2.

1. Symbols used in this document 2

2. Product description 2

2.1 Indicator lights 3

2.2 Terminals 3

2.3 Potentially explosive environments 3

3. Identification 4

3.1 Type key 4

4. Installation 4

4.1 Location 5

4.2 Enclosure class 5

4.3 Terminals 5

4.4 Cables 5

5. Mechanical installation 5

6. EMC-correct installation 6

6.1 Internal GENIbus connection 7

6.2 Fieldbus communication interface

modules 7

6.3 Fitting the CIM module 7

7. Startup 9

8. Technical data 9

9. Electrical data 9

9.1 Supply voltage 9

9.2 Power consumption 9

9.3 Circuit breaker 9

9.4 Backup fuse 9

9.5 Short-circuit protection 9

9.6 Digital inputs 9

9.7 Analog inputs 9

9.8 Digital outputs (relay outputs) 9

9.9 Conductors 9

9.10 USB port 9

9.11 Battery backup (UPS) 10

9.12 Terminal groups 10

10. Overview of inputs and outputs 11

11. Maintenance 12

12. Service 12

13. Replacing the CU 3X2 12

13.1 Replacing the CIM module 12

14. Dimensions 12

15. Disposal 12

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

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.

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)

Fig. 1 Example of CU 3X2

* Some help texts apply to the entire display, other

texts to the individual lines of the display.

2.1 Indicator lights

The CU 3X2 has one green and one red indicator

light.

The green indicator light is on when the power

supply has been switched on.

The red indicator light is on when the system is in

alarm mode.

2.2 Terminals

Fig. 2 Back of the CU 3X2

For further information, see section 9.12 Terminal

groups.

2.3 Potentially explosive environments

The CU 3X2 must not be installed in explosive

environments, but may be used together with

Grundfos pumps approved for installation in

potentially explosive environments.

Warning

If the CU 3X2 is used in a manner not

specified by the manufacturer, the

protection provided by the CU 3X2 may be

impaired.

TM05 3044 0912

Pos. Description

1 LCD display

2Changes to next column in menu

structure.

3 Changes to help text.*

4 Goes up in lists.

5 Goes down in lists.

6Increases the value of a selected

parameter.

7Reduces the value of a selected

parameter.

8 Goes one display back.

9 Goes back to menu "Status".

10 Saves a value.

11 Green indicator light (operation)

12 Red indicator light (alarm)

13 Changes the brightness of the

display.

1213

CU 362

TM05 3181 0912

Pos. Description

1 Nameplate

2 Terminals for digital output relays

3 Terminals for analog inputs

4 Service connection

5 Ethernet (RJ45)

6 Voltage indicator

7 Terminals for digital inputs

8 Terminals for backup battery

9 Terminals for CIM module (optional)

10 Cable clamps for GENIbus connections

11 Internal GENIbus connection

12 Terminal for power supply

13 Label for backup battery

14 USB port

0V 12V

6 7 8 9 10 11 12

English (GB)

3. Identification

The CU 3X2 can be identified by means of the

nameplate on the back. See fig. 3.

Fig. 3 Example of nameplate

The CU 3X2 has a label for the backup battery. See

fig. 4.

Fig. 4 Label for backup battery

Fig. 5 Protective earth terminal

3.1 Type key

4. Installation

The CU 3X2 is only intended for use in control

panels.

Before installation, check the following:

• Does the CU 3X2 correspond to the one

ordered?

• Is it suitable for the power supply available at the

installation site?

• Has it been damaged during transportation?

TM05 3240 1012

Pos. Description

1 Type designation

2 Product number and version number

3 Serial number

4 Production code (year and week)

5 Rated voltage, frequency and power

TM04 2367 2408TM00 5827 3408

Code Example CU 3 X 2

CU Control unit

3X Controller series

2 Model number

Type

Made in Thailand

96161750

Product No.

Serial No.

.c.

OPEN TYPE PROCESS

CONTROL EQUIPMENT

100-240 VAC 50/60Hz - Max. 22W

CU 362

98146953 - VO1

0536

1228

30 XP

12V dc

Battery powered

0V 12V

96801950

Warning

Switch off the power supply before making

connections. Make sure that it cannot be

accidentally switched on.

Warning

The electrical installation should be carried

out by an authorised person in accordance

with local regulations.

Warning

Observe local regulations for safety, health

and environment.

Warning

The terminals L and N as well as 70 to 75

may be connected to dangerous contact

voltage. External control voltage from

other groups may occur.

Warning

All wires to units outside the control panel

must be of the type H05VV-F according to

CENELEC HD21 (to avoid injury from

touching wires).

USA and Canada:

Field wiring installation shall comply with

National Electrical Code (NEC) and/or

Canadian Electrical Code.

Warning

The installation must incorporate a circuit

breaker in order to switch off the mains

supply. It must be close to the CU 3X2 and

easily accessible for the operator. It must

be marked as circuit breaker for the CU

3X2. The circuit breaker must be

according to IEC 60947-1 and IEC

60947-3.

English (GB)

4.1 Location

The CU 3X2 is designed for installation in the front of

a control panel or a separate cabinet.

For outdoor installation the CU 3X2 must be

mounted in a control cabinet with an enclosure class

of minimum IPX4.

4.2 Enclosure class

The CU 3X2 is IP55 when mounted in the front of an

IPX4 enclosure. The cabinet must be of a

flame-retardant material.

USA and Canada

The CU 3X2 is type 3R when mounted in the front of

a cabinet with type rating 1, 2, 3, 3R, 5, 12, 12K or

13.

4.3 Terminals

All terminals are suitable for conductors of 0.5 to 2.5

mm2or AWG 20-13.

4.4 Cables

Cables must be rated min. 70 °C.

5. Mechanical installation

Fasten the CU 3X2 with the four screws, M5 x 10,

supplied with the unit (pos. 1).

Maximum torque: 1.4 Nm.

Dimensions of the CU 3X2, see section

14. Dimensions.

Fig. 6 Mounting in panel front (standard)

Connect the earth terminal (between the cable

clamps) on the CU 3X2 to the mounting frame (pos.

2, fig. 6). See fig. 7.

Fig. 7 Earth connection

Warning

Short-circuit protection

The installation must incorporate external

fuses.

EU/IEC:

Use fuses that comply with IEC 60127.

Rated maximum 10 A, minimum 250 VAC

in both line and in neutral when connecting

the controller to the power source.

USA and Canada (branch circuit

protection):

Use a UL/CSA-listed non-time delay,

class-rated Branch Circuit Fuse (such as

class RK5) rated maximum 10 A, minimum

250 VAC in both line and in neutral when

connecting the controller to the power

source.

TM03 1301 4105

Note

In order to achieve enclosure class IP55,

the CU 3X2 must be mounted in a panel or

cabinet.

TM04 2066 1908

Min. 1.5 mm

Max. 3 mm

English (GB)

6. EMC-correct installation

The CU 3X2 is normally mounted in a panel which

also contains an IO 351 module, contactors and

other power equipment. The panel can also contain

other Grundfos modules and frequency converters.

In order to ensure faultless operation, it is very

important to install the electronic modules in an

EMC-correct way:

• Ensure a sufficient earth connection between the

CU 3X2 and the frame. See fig. 7.

• Use screened cables for GENIbus. Connect the

screen to the cable clamp of the CU 3X2 in front

of the terminals A1, Y1 and B1. See fig. 8.

Also use screened cable for the CIM module.

Fig. 8 Screen fixed with cable clamp

• Signal conductors for digital and analog inputs

and outputs should be screened, i.e. run the

screen all the way to the CU 3X2 and connect it

to frame with for instance a cable clamp.

Do not twist screen ends to avoid pig tails, as this

will destroy the screen effect at high frequencies.

Use cable clamps instead.

TM04 2065 1908

Note

Any isolating plastic tape between screen

and sheath must be removed before

mounting the cable in the cable clamp.

English (GB)

6.1 Internal GENIbus connection

Internal communication is established via GENIbus.

Fig. 9 GENIbus connection

The module type and the number of modules depend on the application software.

6.2 Fieldbus communication interface

modules

The CU 3X2 can be connected to an external

communication network via an add-on CIM module.

CIM: Communication Interface Module.

The CIM modules must be ordered separately.

Connect the CIM module as described in the

installation and operating instructions supplied with

the module.

6.3 Fitting the CIM module

The CIM module must be fitted by an authorised

person.

1. Remove the screw in the back cover of the CU

3X2. See fig. 10.

Fig. 10 Removing the screw that holds the back

cover

TM05 1917 3911

Unit n

Unit n+1

CU 3X2

Warning

Switch off the power supply to the CU 3X2

before fitting the CIM module.

Warning

Electrostatic discharge (ESD) must be

avoided when fitting the CIM module, for

instance by wearing an antistatic wrist

strap as shown in fig. 12.

TM04 2402 2508

English (GB)

2. Open the back cover and break off the tap. See

fig. 11.

Fig. 11 Opening the back cover and breaking off

the tap

3. Fit the CIM module. See fig. 12.

Fig. 12 Fitting the CIM module

4. Place the labels supplied with the CIM module on

the back cover. See fig. 13.

Fig. 13 Placing the new labels on the back

cover

5. Refit the back cover to the CU 3X2, and secure it

with the mounting screw. See fig. 14.

Fig. 14 Refitting the back cover

TM04 2403 2508TM03 2227 3905

TM04 2586 2708TM04 2587 2708

Type:

Kit Funct. module - Geni/RS485Op

Prod. No.

Version V01 Serial No.

P. C. 0538

9854

CIM 250

GSM

CIM 250

96824795

English (GB)

7. Startup

Startup must be carried out by an authorised person.

8. Technical data

Transient voltages typically present on the mains

supply are category 2.

Altitude above sea level

Maximum 2000 m.

Ambient temperature

• During operation: -20 °C* to +60 °C (must not be

exposed to direct sunlight).

• In stock: -20 °C to +60 °C.

• During transportation: -20 °C to +60 °C.

* At temperatures below 0 °C, the display may

react slowly.

Relative air humidity

5 to 95 %.

Enclosure class

IP1X.

For indoor use only.

Pollution degree

External pollution degree 3.

9. Electrical data

9.1 Supply voltage

1 x 100-240 VAC ± 10 %, 50/60 Hz, PE

(Class 1 equipment).

9.2 Power consumption

Maximum 22 W.

9.3 Circuit breaker

Installation of circuit breakers must be done in

accordance with local regulations.

9.4 Backup fuse

Maximum 10 A. Both standard fuses as well as

quick- and slow-blow fuses are suitable.

9.5 Short-circuit protection

Use fuses that comply with IEC 60127.

USA and Canada (branch circuit protection):

Use a UL/CSA-listed non-time delay (high capacity)

fuse that complies with the UL248 series or an

inverse time circuit breaker that complies with

UL489.

Fuse types RK1, RKS, J and CC are acceptable.

9.6 Digital inputs

9.7 Analog inputs

9.8 Digital outputs (relay outputs)

9.9 Conductors

9.10 USB port

Warning

Prior to startup, read the installation and

operating instructions for the product in

question.

Open-circuit voltage 24 VDC

Closed-circuit current 5 mA, DC

Frequency range 0-4 Hz

Input current and voltage

0-20 mA

4-20 mA

0-10 V

Tolerance ± 3.3 % of full scale

Repetitive accuracy ± 1 % of full scale

Input resistance, current < 250 Ω

Input resistance, voltage > 50 kΩ± 10 %

Supply to sensor

24 V, 30 mA,

short-circuit

protected

Normally open contacts C, NO

Maximum contact load 240 VAC, 2 A

Minimum contact load 5 VDC, 10 mA

Rigid conductors 0.5 - 2.5 mm2

20-13 AWG (US)

Flexible conductors without

ferrule

Flexible conductors with

ferrule

With/without plastic collar

0.5 - 1.5 mm2

20-13 AWG (US)

USB port USB 2.0, type B

English (GB)

9.11 Battery backup (UPS)

A battery can be connected to the CU 3X2 as backup

for the normal power supply. The battery can be

connected directly to the CU 3X2 without a fuse.

With the backup battery the CU 3X2 can continue to

operate despite interruptions in the normal power

supply.

Fig. 15 Label for backup battery

9.11.1 Battery data

The backup battery should meet the below

requirements:

9.11.2 Battery monitoring

The CU 3X2 can monitor the following:

• short circuit

• wrong polarity

• defective battery

• battery missing

• low battery voltage.

9.12 Terminal groups

Fig. 16 Terminal groups

The terminals of the groups 2, 3, 5 and 6 are

insulated from all other terminal groups by reinforced

insulation, 2224 VAC.

All control terminals in groups 2, 3, 5 and 6 are

supplied with SELV voltage (Safety Extra-Low

Voltage).

TM04 2367 2408

Battery make Power Sonic

Battery type Lead acid battery AGM type

Battery series PS 12xxx series UL R/C under

file number MH20845

Rated voltage 12 V

Battery capacity 40 Ah, recommended

(24 hours operating time)

Nominal charging

time 8 hours (40 Ah battery)

12V dc

Battery powered

0V 12V

96801950

TM05 3182 0912

Group 1 Connection of power supply

Group 2 Internal GENIbus connection

Group 3 Fieldbus connection

(CIM module) (not standard)

Group 4 Connection of backup battery

Group 5 Digital inputs

Group 6 Ethernet connection

Group 7 Service connection (GENIbus)

Group 8 Analog inputs

Group 9 USB port

Group 10 Digital outputs

54 3 21

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