Grundfos PC Tool CU 300 User manual

CU 300
GRUNDFOS INSTRUCTIONS
Installation and operating instructions
No contact
Overvoltage
Undervoltage
Dry running
Speed reduction
Overtemperature
Overload
Sensor alarm
For Sales & Service Contact
2650 E. 40th Ave. • Denver, CO 80205
Phone [phone] • Fax [phone]
1-800-833-7958
www.geotechenv.com

2
Declaration of Conformity
We Grundfos declare under our sole responsibility that the product CU 300, to which this
declaration relates, is in conformity with the Council Directives on the approximation of the
laws of the EC Member States relating to
— Electromagnetic compatibility (89/336/EEC).
Standards used: EN 55 014 and EN 55 014-2.
— Electrical equipment designed for use within certain voltage limits (73/23/EEC) [95].
Standard used: EN 60 335-1.
Bjerringbro, 15th December 2004
Jan Strandgaard
Technical Manager

3
CONTENTS
Page
1. General 5
1.1 Expansion possibilities 5
1.2 On/Off button 5
2. CU 300 as an alarm unit 6
2.1 Description 6
2.2 Installation 6
2.3 Location 6
2.4 Mounting the CU 300 6
2.5 Electrical connection 7
2.5.1 Mains supply 7
2.5.2 Pump supply 7
2.5.3 Alarm signal relay 7
2.5.4 Digital input 7
2.6 Description of dry-running protection 8
2.6.1 Function 8
2.7 Settings 8
2.7.1 Required R100 settings 8
2.8 Description of the dewatering function 8
2.8.1 Applications 8
2.8.2 Function 9
2.9 Settings 9
2.9.1 Required R100 settings 9
2.9.2 Run/stop times 9
3. CU 300 with constant pressure
control - 0 to 6 bar 10
3.1 Description 10
3.2 Function 10
3.3 Positioning the pressure sensor 11
3.4 System sizing 12
3.5 Installation 12
3.6 Location 12
3.7 Mounting the CU 300 12
3.8 Electrical connection 13
3.8.1 Mains supply 13
3.8.2 Pump supply 14
3.8.3 Alarm signal relay 14
3.9 Settings 14
3.9.1 Required R100 settings 14
3.10 Start-up 14
4. CU 300 with constant pressure
control - 0 to 10 bar 15
4.1 Description 15
4.2 Function 15
4.3 Positioning the pressure sensor 15
4.4 System sizing 16
4.5 Installation 16
4.6 Location 16
4.7 Mounting the CU 300 16
4.8 Electrical connection 17
4.8.1 Mains supply 17
4.8.2 Pump supply 18
4.8.3 Alarm signal relay 18
4.9 Settings 18
4.9.1 Required R100 settings 18
4.10 Start-up 18
5. CU 300 with constant pressure
control - two-pump operation 19
5.1 Description 19
5.2 Function 19
5.3 Positioning the pressure sensor 20
5.4 System sizing 20
5.5 Installation 20
5.6 Location 20
5.7 Mounting the CU 300 20
5.8 Electrical connection 21
5.8.1 Auxiliary relay 21
5.8.2 Mains supply 21
5.8.3 Pump supply 22
5.8.4 Alarm signal relay 22
5.8.5 Flow switch and pressure sensor 22
5.9 Settings 22
5.9.1 Required R100 settings 22
5.10 Start-up 22
6. CU 300 with sensors 23
6.1 General 23
6.2 Sensor functioning 23
6.2.1 Alarm limits 23
6.2.2 Warning limits 23
6.2.3 Start/stop limits 23
6.3 Installation 24
6.4 Location 24
6.5 Mounting the CU 300 24
6.6 Electrical connection 25
6.6.1 Mains supply 25
6.6.2 Pump supply 26
6.6.3 Alarm signal relay 26
6.6.4 Sensors 26
6.7 Settings 26
6.7.1 Required R100 settings 26
7. CU 300 connected to
potentiometer 27
7.1 Description 27
7.2 Installation 27
7.3 Location 27
7.4 Mounting the CU 300 27
7.5 Electrical connection 28
7.5.1 Mains supply 28
7.5.2 Pump supply 29
7.5.3 Alarm signal relay 29
7.5.4 Potentiometer SPP 1 29
7.6 Settings 29
7.6.1 Required R100 settings 29
8. CU 300 connected to water meter 30
8.1 Description 30
8.2 Installation 30
8.3 Location 30
8.4 Mounting the CU 300 30
8.5 Electrical connection 31
8.5.1 Mains supply 31
8.5.2 Pump supply 31
8.5.3 Alarm signal relay 31
8.5.4 Water meter (pulse flow meter) 32
8.6 Settings 32
8.6.1 Required R100 settings 32

4
9. Constant water level 33
9.1 Description 33
9.2 Function 33
9.3 Installation 33
9.4 Location 33
9.5 Mounting the CU 300 33
9.6 Electrical connection 34
9.6.1 Mains supply 34
9.6.2 Pump supply 35
9.6.3 Alarm signal relay 35
9.6.4 Level sensor 35
9.7 Settings 35
9.7.1 Required R100 settings 35
10. CU 300 connected to RS-232,
RS-485 36
10.1 Description 36
10.2 CU 300 connected to a PC directly 36
10.3 Installation 37
10.4 Location 37
10.5 Mounting the CU 300 37
10.6 Electrical connection 38
10.6.1 Mains supply 38
10.6.2 Pump supply 38
10.6.3 Alarm signal relay 39
10.6.4 RS-485 input 39
10.6.5 RS-232 input 39
10.6.6 Modem 39
10.6.7 PC Tool CU 300 39
11. Alarm functions 40
11.1 No contact 40
11.2 Overvoltage 40
11.3 Undervoltage 40
11.4 Dry running 41
11.5 Speed reduction 41
11.6 Overtemperature 41
11.7 Overload 42
11.8 Sensor alarm 42
12. CU 300 with R100 43
12.1 Menu OPERATION 47
12.1.1 Setpoint 47
12.1.2 Operating mode 47
12.1.3 Alarm 47
12.2 Menu STATUS 48
12.2.1 Operating mode 48
12.2.2 Actual setpoint and external setpoint 48
12.2.3 Temperature 49
12.2.4 Speed 49
12.2.5 Power input and power consumption 49
12.2.6 Operating hours and number of starts 49
12.2.7 Sensor 1 and sensor 2 49
12.2.8 Digital input 49
12.2.9 Accumulated flow and energy per m³ 50
12.3 Menu LIMITS 50
12.3.1 Sensor 1 50
12.3.2 Stop, sensor 1 50
12.3.3 Warning, sensor 1 50
12.3.4 Alarm, sensor 1 50
12.3.5 Sensor 2 51
12.3.6 Stop, sensor 2 51
12.3.7 Warning, sensor 2 51
12.3.8 Alarm, sensor 2 51
12.3.9 Stop type 51
12.3.10Digital input 52
12.3.11 Accumulated flow 52
12.3.12Warning, temperature 52
12.4 Menu INSTALLATION 52
12.4.1 Controller 52
12.4.2 External setpoint 53
12.4.3 Automatic restart 53
12.4.4 Start delay 54
12.4.5 Run/Stop 54
12.4.6 Dry-running stop 54
12.4.7 Dry-running protection 54
12.4.8 Maximum speed 55
12.4.9 Button on CU 300 55
12.4.10Number 55
13. Technical data 56
14. Disposal 57

5
1. General
The control unit CU 300 is developed for the SQE
submersible pumps.
The CU 300 covers the voltage range:
1 x 100-240 V –10%/+6%, 50/60 Hz, PE.
The CU 300 enables:
• control of the pump on the basis of sensor signals,
• setting of operating parameters, and
• monitoring of operation and alarm indication, if
any.
The CU 300 indicates the following alarms:
• No contact,
•Overvoltage,
• Undervoltage,
• Dry running,
• Speed reduction,
• Overtemperature,
• Overload,
• Sensor alarm.
The individual alarms are described in detail in sec-
tion 11. Alarm functions.
The CU 300 receives alarm signals from the motor
for the following parameters:
• Dry running.
• Incipient pump/motor defect.
• Too high temperature in motor electronics.
• Supply failure.
As standard, the CU 300 incorporates an alarm sig-
nal relay.
1.1 Expansion possibilities
The CU 300 enables the use of:
•Remote control R100:
Wireless infra-red remote control by means of the
R100 enables change of factory settings and mon-
itoring of the installation by calling up actual oper-
ating data, e.g. speed, operating hours and power
consumption.
•External sensors:
Reception of data from external sensors and con-
trol according to the data received, e.g. flow rate,
pressure, water level and conductivity.
•External potentiometer SPP 1:
Manual speed control.
1.2 On/Off button
By means of the On/Off button on the CU 300, it is
possible to
• start/stop the pump and
• reset possible alarms.
Fig. 1
The green and red indicator lights in the On/Off but-
ton indicate pump operating condition as follows:
* If the On/Off button has been used to stop the
pump, this button must also be used for restarting.
If the On/Off button is pressed for minimum 5 sec-
onds, the pump is started, irrespective of any active
fault/alarm indications. When the On/Off button is
released, the pump will stop.
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully. The in-
stallation and operation should also be in
accordance with local regulations and ac-
cepted codes of good practice.
TM01 2829 4601
Indication Description
Greenindicatorlight
permanently on. Pump is operating.
Greenindicatorlight
flashing.
Pump has been stopped by
either:
•asensor,
• an external on/off switch
or
• a stop command from the
R100.
Red indicator light
permanently on. Pump has been stopped by means of the On/Off button.*
Red indicator light
flashing. The CU 300 is communicat- ing with the R100.
Green
Red

6
2. CU 300 as an alarm unit
2.1 Description
When the CU 300 is connected to an SQE pump,
any alarm will be indicated by one of the eight red
indicator lights on the CU 300.
The indications are based on signals from the motor
and from sensors, if installed. The individual alarms
are described in detail in section 11. Alarm functions.
It is possible to connect an external alarm signal
transmitter and an external on/off switch, see section
2.5 Electrical connection concerning connection, etc.
Fig. 2 shows an example of an installation with the
CU 300 as an alarm unit.
Fig. 2
The CU 300 functions as an alarm unit for the pump.
Furthermore, it is possible to communicate with the
pump via the remote control R100, see also section
12. CU 300 with R100.
2.2 Installation
2.3 Location
The CU 300 can be placed both indoors and out-
doors. It must not be exposed to direct sunlight.
2.4 Mounting the CU 300
The CU 300 is designed for wall mounting.
The box has six mounting holes (ø4), see fig. 3
(dimensions stated in mm).
The CU 300 must be mounted:
• horizontally (see fig. 3) to allow condensed water,
if any, to escape.
• on a plane surface to avoid deformation of the
box.
Fig. 3
The 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/wires to ensure tight connections (IP 55) and
cable relief.
TM01 3150 4601
Before starting any work on the CU 300,
make sure that the electricity supply has
been switched off and that it cannot be ac-
cidentally switched on.
TM01 2824 2498
104.5
104.5
100
140.5

7
2.5 Electrical connection The supply voltage and frequency are marked on the
nameplate. Make sure that the CU 300 is suitable for
the electricity supply on which it will be used.
Fig. 4
Legend:
2.5.1 Mains supply
POWER, terminals 1, 2 and PE:
Connect terminals 1 and 2 to the phase and neutral
leads of the mains supply. Each terminal can be con-
nected to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
Back-up fuse: Maximum 16 A.
Note: The leads of the mains supply must not be
connected to terminals 3 and 4 (PUMP).
2.5.2 Pump supply
PUMP, terminals 3, 4 and PE:
Connect terminals 3 and 4 to the phase and neutral
leads of the pump. Each terminal can be connected
to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
2.5.3 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.
Manual or automatic restarting can be selected in the
R100 display 12.4.3 Automatic restart.
Manual restarting is carried out by means of the
On/Off button on the CU 300.
2.5.4 Digital input
DIG IN, terminals 11, 12 and 13:
In fig. 4, the digital input is used to start and stop the
pump.
The function of the digital input can be selected by
means of the R100 in display 12.3.10 Digital input.
Never make any connections in the
CU 300 unit unless the electricity supply
has been switched off. The CU 300 must
be connected in accordance with the rules
and standards in force for the application
in question.
TM01 3067 3398
K1
POWER
PE
PUMP
RELAY
ALARM
COM NC NO
NO NC COM
AUX
RELAY IN
DIG
IN
+24VDC
GND GND
+24VDC
IN
SENSOR
12
SENSOR
IN
+24VDC
GND
RS
485 RS
232
B
GND A
RI
DTR RXD
GND
567
12
1098
34
111213 161514 171819
PE
TXD
LNLN
HS1
Pos. Description
S1 On/off switch for start/stop of pump
H Alarm signal transmitter (optional)
K1 Internal alarm signal relay
Relay data: 250 VAC, 8 A, AC1

8
2.6 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 R100 display 12.4.6 Dry-run-
ning stop, the pump will stop and the CU 300 will
indicate the dry-running alarm.
2.6.1 Function
The dry-running protection applies only if the motor
speed lies within the “maximum speed” range (i.e.
maximum speed less 1,000 min-1), see fig. 5.
Normally, “maximum speed” is 10,700 min-1. How-
ever, it can be reduced in the R100 display 12.4.8
Maximum speed. The dry-running power limit set in
display 12.4.6 Dry-running stop must match the
speed.
Changing the setpoint:
If the setpoint is changed by means of the R100 dis-
play 12.1.1 Setpoint or 12.4.2 External 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 1,000 min-1), see fig. 5.
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.
Fig. 5
2.7 Settings
In the following section, the relevant R100 displays
and settings are shown and described.
For a detailed description of the R100 displays, see
section 12. CU 300 with R100. Each individual dis-
play has a number which refers to the section in
which it is described in detail.
2.7.1 Required R100 settings
If the maximum speed of the pump has been re-
duced by more than 1,000 min-1, the dry-running
stop value must be changed. In order to change the
dry-running protection function, the following R100
settings must be made:
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 R100 display
12.2.5 Power input and power consumption.
3. Calculate the dry-running power limit,
P1x 0.9 [W].
4. Set this value in the R100 display 12.4.6 Dry-run-
ning stop.
2.8 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 R100 display 12.4.6 Dry-run-
ning stop, the pump will stop.
During dewatering, the green indicator light in the
On/Off button on the CU 300 is flashing to indicate
that the pump has stopped.
2.8.1 Applications
The dewatering function can be used 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.
TM01 2689 2598
M
ax. spee
d
as set in display
12.4.8
Max. speed
-1,000 min-1
Motor speed
Pump
power input
Pump power curve
Dry-running
power limit set
3,000 min-1
Watt
10,700 min-1
Display R100 setting
12.4.7 Dry-running
protection
Set “Dry-running protection”
to “Active”.
Note: In certain installations,
it may be necessary to dis-
able the dry-running protec-
tion. This is done in this
display. The disabling ap-
plies to the dry-running power
limit set in display 12.4.6 Dry-
running stop.
See fig. 5.
12.4.6 Dry-running
stop Set the dry-running power
limit, i.e. dry-running stop.
See “Setting of dry-running
power limit (dry-running
stop)” below and section 13.
Technical data.

9
2.8.2 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 R100 display
12.4.6 Dry-running stop in the INSTALLATION
menu.
Note: The length of the stop time depends on the
length of the run time according to a setting made
in the R100 display 12.4.5 Run/Stop in the IN-
STALLATION menu.
2.9 Settings
In the following section, the relevant R100 displays
and settings are shown and described.
For a detailed description of the R100 displays, see
section 12. CU 300 with R100. Each individual dis-
play has a number which refers to the section in
which it is described in detail.
2.9.1 Required R100 settings
In order to activate the dewatering function, the fol-
lowing R100 settings must be made:
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 R100 display
12.2.5 Power input and power consumption.
3. Calculate the dry-running power limit,
P1x 0.9 [W].
4. Set this value in the R100 display 12.4.6 Dry-run-
ning stop.
2.9.2 Run/stop times
The dewatering function means that there is a de-
pendence between the period of time during which
the pump is running, the run time, and the period of
time during which the pump is stopped, the stop
time.
Fig. 6 shows an example of run/stop times set in the
R100 display 12.4.5 Run/Stop.
Fig. 6
Explanation:
The run and stop times were set to 60 min. each.
The pump has been running for 25 min. when dry
running occurs. The pump will be stopped for 35 min.
If the pump had been running for e.g. 2 hours
(120 min.), the stop time would be 1 min.
Display R100 setting
12.4.7 Dry-running
protection
Set “Dry-running protection”
to “Active”.
12.4.6 Dry-running
stop Set the dry-running power
limit, i.e. dry-running stop.
See “Setting of dry-running
power limit (dry-running
stop)” below.
12.4.5 Run/Stop
Set the relation between run
and stop times.
Indication of operation:
The dry-running alarm indica-
tion on the CU 300 is auto-
matically disabled, when the
setting is made in display
12.4.5 Run/Stop.
To disable the dewatering
function and return to dry-
running protection, simply set
the Run/Stop fields to “–”
(not active).
TM01 2690 2298

10
3. CU 300 with constant pressure
control - 0 to 6 bar
3.1 Description
Using constant pressure control enables automatic
adjustment of the pump performance according to
consumption. The system maintains a constant pres-
sure within the maximum pump performance in spite
of a varying water consumption.
Fig. 7 shows an example of an installation with con-
stant pressure control within the range from 0 to
6 bar.
Fig. 7
3.2 Function
The pressure is registered by means of the pressure
sensor, which transmits a signal to the CU 300. The
CU 300 adjusts the pump performance accordingly
by changing the pump speed.
Mains borne signalling:
The communication between the CU 300 and the
pump is effected via the power supply 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 sup-
ply cable and led into the electronics unit by means
of signal coils incorporated in the motor and the
CU 300 respectively.
When does the pump start?
The pump starts as a consequence of...
• a high flow or
• a low pressure or
• a combination of both.
To ensure that the pump is started 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 will drop according-
ly depending on the size of the diaphragm tank and
the water flow:
• at a low flow, the pressure will drop slowly.
• at a high flow, the pressure will drop quickly.
See fig. 8.
Fig. 8
Note: When the pressure is dropping 0.1 bar/s or
faster, the pump will start immediately.
If a diaphragm tank of 8 litres is used, the pump will
start at a flow rate of approx. 0.18 m³/h.
Note: If a larger tank is used, the flow must be
higher before the pump starts.
Consumption up to 0.18 m³/h:
The pump will start when the pressure has dropped
to 0.5 bar below the pressure setting.
The pump will run until the pressure is 0.5 bar above
the pressure set.
Flow detection:
During pump operation, i.e. when water is con-
sumed, the CU 300 will adjust the pump speed to
maintain a constant pressure. In order to stop the
pump when no water is consumed, the CU 300 per-
forms flow detection every 10 seconds.
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. 9.
If the pump speed can be reduced without any pres-
sure drop being registered, this indicates that no
water is consumed. The diaphragm tank will be filled
with water and the pump will be stopped.
TM01 9649 4601
Pos. Description
1CU300
2Diaphragm tank
Absorbs pressure variations.
3Pressure sensor The required pressure is set using the
R100.
TM01 8545 0400
Pressure
Time
Low flow
High flow

11
Fig. 9
System limits:
Even though the CU 300 is controlling the pressure
within ±0.2 bar, bigger pressure variations may occur
in the system.
If the consumption is suddenly changed, e.g. if a tap
is opened, the water must start flowing before the
pressure can be made constant again. Such dynam-
ic variations depend on the pipework, 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. 10.
Fig. 10
A = Required pressure
3.3 Positioning the pressure sensor
Pressure loss often causes inconvenience to the
user. The CU 300 keeps the pressure constant in the
place where the pressure sensor is positioned, see
fig. 11.
Fig. 11
In fig. 11, tap 1 is placed close to the pressure sen-
sor. Therefore, the pressure will be kept nearly con-
stant 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 piping. However, old and
furred-up piping may cause inconvenience due to
friction loss.
Therefore, it is recommended that the pressure sen-
sor be positioned as close to the places of consump-
tion as possible.
TM01 8546 0400TM01 8634 0500
Pressure
Time
Flow detection
10 s10 s
Controlling
±0.2 bar Dynamic
variations
±0.5 bar
Pressure
Start
-0.5 bar
A
Stop
+0.5 bar
m³/h
0.18
F
low
Flow
TM01 9670 4601
S
hower
Tap 1 Tap 2
CU 300
8 l

12
3.4 System sizing
In normal installations with the CU 300 and an SQE
pump set to constant pressure control, the required
tank size is 8 litres. Bigger tanks can be used without
causing any problems.
3.5 Installation
3.6 Location
The CU 300 can be placed both indoors and out-
doors. It must not be exposed to direct sunlight.
3.7 Mounting the CU 300
The CU 300 is designed for wall mounting.
The box has six mounting holes (ø4), see fig. 12
(dimensions stated in mm).
The CU 300 must be mounted:
• horizontally (see fig. 12) to allow condensed wa-
ter, if any, to escape.
• on a plane surface to avoid deformation of the
box.
Fig. 12
The 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/wires to ensure tight connections (IP 55) and
cable relief.
The installation must be designed for the
maximum pump pressure.
Before starting any work on the CU 300,
make sure that the electricity supply has
been switched off and that it cannot be ac-
cidentally switched on.
TM01 2824 2498
104.5
104.5
100
140.5

13
3.8 Electrical connection The supply voltage and frequency are marked on the
nameplate. Make sure that the CU 300 is suitable for
the electricity supply on which it will be used.
Fig. 13
Legend: 3.8.1 Mains supply
POWER, terminals 1, 2 and PE:
Connect terminals 1 and 2 to the phase and neutral
leads of the mains supply. Each terminal can be con-
nected to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
Back-up fuse: Maximum 16 A.
Note: The leads of the mains supply must not be
connected to terminals 3 and 4 (PUMP).
Never make any connections in the
CU 300 unit unless the electricity supply
has been switched off. The CU 300 must
be connected in accordance with the rules
and standards in force for the application
in question.
TM01 9650 2400
K1
POWER
PE
PUMP
RELAY
ALARM
COM NC NO
NO NC COM
AUX
RELAY IN
DIG
IN
+24VDC
GND GND
+24VDC
IN
SENSOR
12
SENSOR
IN
+24VDC
GND
RS
485 RS
232
B
GND A
RI
DTR RXD
GND
567
12
1098
34
111213 161514 171819
PE
TXD
LNLN
H
1
3
2
4
Pos. Description
1Pressure sensor, brown lead, terminal
14
2 Pressure sensor, black lead, terminal 15
3 Pressure sensor, screen, terminal GND
4Pressure sensor
Must be connected to sensor input 1.
H Alarm signal transmitter (optional).
K1 Internal alarm signal relay
Relay data: 250 VAC, 8 A, AC1

14
3.8.2 Pump supply
PUMP, terminals 3, 4 and PE:
Connect terminals 3 and 4 to the phase and neutral
leads of the pump. Each terminal can be connected
to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
3.8.3 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 operates when the alarm and warning lim-
its are exceeded.
Manual or automatic restarting can be selected in the
R100 display 12.4.3 Automatic restart.
Manual restarting is carried out by means of the
On/Off button on the CU 300.
3.9 Settings
In the following section, the relevant R100 displays
and settings are shown and described.
For a detailed description of the R100 displays, see
section 12. CU 300 with R100. Each individual dis-
play has a number which refers to the section in
which it is described in detail.
3.9.1 Required R100 settings
The following R100 settings must be made:
3.10 Start-up
Prior to start-up, the precharge pressure of the dia-
phragm tank must be set to 70% of the setpoint set
in the R100 display 12.1.1 Setpoint.
Display R100 setting
12.4.1 Controller
Select “Closed loop”.
12.3.1 Sensor 1 Set the sensor type.
Example:
• Sensor output signal
(4-20 mA),
• setting range unit (m),
• setting range - head
(0-40 m).
12.3.9 Stop type Set the stop type.
• Sensor 1: “Fill”.
• Sensor 2: “–” (not active).
12.3.10 Digital in-
put Set
• Type to “–” (not active) and
• l/pulse to “–” (not active).
12.1.1 Setpoint Set the desired head (m).
Example: 35 m.
Rule: The maximum setting
of the setpoint corresponds to
the maximum value set in dis-
play 12.3.1 Sensor 1 less
5 m.
In this case, 40 less 5 = 35 m.

15
4. CU 300 with constant pressure
control - 0 to 10 bar
4.1 Description
Using constant pressure control enables automatic
adjustment of the pump performance according to
consumption. The system maintains a constant pres-
sure within the maximum pump performance in spite
of a varying water consumption.
Fig. 14 shows an example of an installation with con-
stant pressure control within the range from 0 to
10 bar.
Fig. 14
4.2 Function
The pressure is registered by means of the pressure
sensor and transmitted to the CU 300. The CU 300
adjusts the pump performance accordingly. To en-
sure that the pump is started when water is con-
sumed, a flow switch must be included in the system.
The required pressure (setpoint) is set in the R100
display 12.1.1 Setpoint.
•Consumption up to 0.18 m³/h.
The flow switch contact is open.
The pump starts when the pressure is equal to the
setpoint less 0.5 bar. The pump will fill the tank
and stop when the pressure is equal to the set-
point plus 0.5 bar. Consequently, the pump runs
on/off operation.
•Consumption above 0.18 m³/h.
The flow switch contact is closed.
The pump starts when the flow switch contact
closes and the speed control ensures that the
pressure is kept constant. If the flow is below
0.18 m³/h and the flow switch contact is opened,
the tank is filled to a pressure equal to the setpoint
plus 0.5 bar. When this pressure is reached, the
pump stops. Stopping is a combination of the flow
switch contact opening and the pressure being
equal to the setpoint plus 0.5 bar.
If the flow is larger than the quantity the pump is able
to deliver at the desired pressure, the pressure fol-
lows the pump curve as illustrated in fig. 15.
Fig. 15
A = Required pressure
4.3 Positioning the pressure sensor
Pressure loss often causes inconvenience to the
user. The CU 300 keeps the pressure constant in the
place where the pressure sensor is positioned, see
fig. 16.
Fig. 16
In fig. 16, tap 1 is placed close to the pressure sen-
sor. Therefore, the pressure will be kept nearly con-
stant 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 piping. However, old and
furred-up piping may cause inconvenience due to
friction loss.
TM01 2653 4601
Pos. Description
1 CU 300
2Diaphragm tank
Absorbs pressure variations.
3Flow switch The pump starts at once when water is
consumed at the taps.
4Pressure sensor The required pressure is set using the
R100.
1
2
3
4
TM01 2833 2598TM01 2834 4601
A
Tap 1 Tap 2
CU 300
Shower
8 l

16
Therefore, it is recommended that the pressure sen-
sor be positioned as close to the places of consump-
tion as possible.
4.4 System sizing
In normal installations with the CU 300 and an SQE
pump set to constant pressure control, the required
tank size is 8 litres. Bigger tanks can be used without
causing any problems.
4.5 Installation
4.6 Location
The CU 300 can be placed both indoors and out-
doors. It must not be exposed to direct sunlight.
4.7 Mounting the CU 300
The CU 300 is designed for wall mounting.
The box has six mounting holes (ø4), see fig. 17
(dimensions stated in mm).
The CU 300 must be mounted:
• horizontally (see fig. 17) to allow condensed wa-
ter, if any, to escape.
• on a plane surface to avoid deformation of the
box.
Fig. 17
The 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/wires to ensure tight connections (IP 55) and
cable relief.
The installation must be designed for the
maximum pump pressure.
Before starting any work on the CU 300,
make sure that the electricity supply has
been switched off and that it cannot be ac-
cidentally switched on.
TM01 2824 2498
104.5
104.5
100
140.5

17
4.8 Electrical connection The supply voltage and frequency are marked on the
nameplate. Make sure that the CU 300 is suitable for
the electricity supply on which it will be used.
Fig. 18
Legend: 4.8.1 Mains supply
POWER, terminals 1, 2 and PE:
Connect terminals 1 and 2 to the phase and neutral
leads of the mains supply. Each terminal can be con-
nected to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
Back-up fuse: Maximum 16 A.
Note: The leads of the mains supply must not be
connected to terminals 3 and 4 (PUMP).
Never make any connections in the
CU 300 unit unless the electricity supply
has been switched off. The CU 300 must
be connected in accordance with the rules
and standards in force for the application
in question.
TM01 3089 3398
56
4
K1
POWER
PE
PUMP
RELAY
ALARM
COM NC NO
NO
NC
COM
AUX
RELAY IN
DIG
IN
+24VDC
GND GND
+24VDC
IN
SENSOR
12
SENSOR
IN
+24VDC
GND
RS
485
RS
232
B
GND A
RI
DTR RXD
GND
567
12
1098
34
1112 13 161514 171819
PE
TXD
LNLN
H1
3
2
Pos. Description
1Pressure sensor, brown lead, terminal
14
2 Pressure sensor, black lead, terminal 15
3 Pressure sensor, screen, terminal GND
4Pressure sensor
Must be connected to sensor input 1.
5 Diaphragm tank connection
6
Flow switch
Must be connected to the digital input,
terminals 12 and 13. Cannot be con-
nected wrongly.
H Alarm signal transmitter (optional)
K1 Internal alarm signal relay
Relay data: 250 VAC, 8 A, AC1

18
4.8.2 Pump supply
PUMP, terminals 3, 4 and PE:
Connect terminals 3 and 4 to the phase and neutral
leads of the pump. Each terminal can be connected
to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
4.8.3 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 operates when the alarm and warning lim-
its are exceeded.
Manual or automatic restarting can be selected in the
R100 display 12.4.3 Automatic restart.
Manual restarting is carried out by means of the
On/Off button on the CU 300.
4.9 Settings
In the following section, the relevant R100 displays
and settings are shown and described.
For a detailed description of the R100 displays, see
section 12. CU 300 with R100. Each individual dis-
play has a number which refers to the section in
which it is described in detail.
4.9.1 Required R100 settings
The following R100 settings must be made:
4.10 Start-up
Prior to start-up, the precharge pressure of the dia-
phragm tank must be set to 70% of the setpoint set
in the R100 display 12.1.1 Setpoint.
Display R100 setting
12.4.1 Controller
Select “Closed loop”.
12.3.1 Sensor 1 Set the sensor type.
Example:
• Sensor output signal
(4-20 mA),
• setting range unit (m),
• setting range - head
(0-40 m).
12.3.9 Stop type Set the stop type.
• Sensor 1: “Fill”.
• Sensor 2: “–” (not active).
12.3.10 Digital in-
put Set
• Type to “Start” and
• l/pulse to “–” (not active).
12.1.1 Setpoint Set the desired head (m).
Example: 35 m.
Rule: The maximum setting
of the setpoint corresponds to
the maximum value set in dis-
play 12.3.1 Sensor 1 less
5 m.
In this case, 40 less 5 = 35 m.

19
5. CU 300 with constant pressure
control - two-pump operation
5.1 Description
Using constant pressure control in connection with
two-pump operation enables automatic adjustment
of the pump performance according to the consump-
tion in systems where a high flow is required. The
system maintains a constant pressure within the
maximum pump performance in spite of a varying
water consumption.
Note: During two-pump operation, the two pumps
must have the same nominal flow, e.g. two SQE 2.
Fig. 19 shows an example of a two-pump installation
with constant pressure control.
Fig. 19
5.2 Function
The pressure is registered by means of the pressure
sensor and transmitted to the CU 300 (master). The
CU 300 adjusts the pump speed to ensure that the
pressure is kept constant. To ensure that the pump
connected to the CU 300 (master) is started when
water is consumed, a flow switch must be included in
the system.
Set the CU 300 (master) to the desired pressure
(setpoint) in the R100 display 12.1.1 Setpoint.
•Consumption up to 0.18 m³/h.
The flow switch contact is open.
The pump connected to the CU 300 (master)
starts when the pressure is equal to the setpoint
less 0.5 bar. The pump will fill the tank and stop
when the pressure is equal to the setpoint plus
0.5 bar. Consequently, the pump runs on/off oper-
ation.
•Consumption above 0.18 m³/h.
The flow switch contact is closed.
The pump connected to the CU 300 (master)
starts when the flow switch contact closes and the
speed control ensures that the pressure is kept
constant.
If the flow is lower than 0.18 m³/h and the flow
switch contact is opened, the tank is filled to a
pressure equal to the setpoint plus 0.5 bar. When
this pressure is reached, the pump stops. Stop-
ping is a combination of the flow switch contact
opening and the pressure being equal to the set-
point plus 0.5 bar.
If the consumption exceeds the quantity the pump
connected to the CU 300 (master) is able to de-
liver, the pressure in the diaphragm tank will fall.
The pump connected to the CU 300 (slave) will be
started in the two following situations:
1. If the pressure in the diaphragm tank falls to 1
bar below the setpoint or
2. if the pump connected to the CU 300 (master)
has been operating at maximum performance for
more than 5 seconds and the water requirement
has increased.
The pump connected to the CU 300 (slave) will be
stopped in the three following situations:
1. If the system pressure is 1 bar higher than the
setpoint or
2. if the pump connected to the CU 300 (master)
has been operating at minimum performance for
more than 5 seconds and the water requirement
has fallen or
3. if the flow switch indicates “no flow" and the sys-
tem pressure is 0.5 bar higher than the setpoint.
If the flow is larger than the quantity the pumps are
able to deliver at the desired pressure, the pressure
follows the pump curve as illustrated in fig. 20.
Fig. 20
A = Required pressure
TM01 2654 4601
Pos. Description
1A, 1B 1A = CU 300 (master)
1B = CU 300 (slave)
2Diaphragm tank, minimum 24 litres
Absorbs pressure variations.
3Flow switch The pump starts at once when water is
consumed at the taps.
4Pressure sensor The required pressure is set using the
R100.
1A 1B
2
3
4
TM01 2833 2598
A
Pressure
±1.0 bar
±0.2 bar
-
0.5 bar

20
5.3 Positioning the pressure sensor
See section 4.3 Positioning the pressure sensor.
5.4 System sizing
In two-pump installations set to constant pressure
control, the required tank size is 24 litres. Bigger
tanks can be used without causing any problems.
5.5 Installation
5.6 Location
The CU 300 can be placed both indoors and out-
doors. It must not be exposed to direct sunlight.
5.7 Mounting the CU 300
The CU 300 is designed for wall mounting.
The box has six mounting holes (ø4), see fig. 21
(dimensions stated in mm).
The CU 300 must be mounted:
• horizontally (see fig. 21) to allow condensed wa-
ter, if any, to escape.
• on a plane surface to avoid deformation of the
box.
Fig. 21
The 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/wires to ensure tight connections (IP 55) and
cable relief.
The installation must be designed for the
maximum pump pressure.
Before starting any work on the CU 300,
make sure that the electricity supply has
been switched off and that it cannot be ac-
cidentally switched on.
TM01 2824 2498
104.5
104.5
100
140.5