Grundfos CU 3x4 User manual

CU 3X2, CU 3X4
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
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)
3
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.
1
11
10
9
8
7
6
4
5
3
2
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
1
13
2
3
4
5
6 7 8 9 10 11 12
14

English (GB)
4
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.
U
N
Serial No.
P
.c.
!
OPEN TYPE PROCESS
CONTROL EQUIPMENT
100-240 VAC 50/60Hz - Max. 22W
CU 362
98146953 - VO1
12
4
5
3
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)
5
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
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)
7
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)
8
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)
9
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)
10
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
10
8
7
6
54 3 21
9