Grundfos CU 301 Manuale utente

CU 301

GRUNDFOS INSTRUCTIONS

Installation and operating instructions

LIMITED WARRANTY

Products manufactured by GRUNDFOS PUMPS CORPORATION (Grundfos) are

warranted to the original user only to be free of defects in material and workmanship

for a period of 24 months from date of installation, but not more than 30 months from

date of manufacture. Grundfos' liability under this warranty shall be limited to repair-

ing or replacing at Grundfos' option, without charge, F.O.B. Grundfos' factory or

authorized service station, any product of Grundfos' manufacture. Grundfos will not

be liable for any costs of removal, installation, transportation, or any other charges

which may arise in connection with a warranty claim. Products which are sold but

not manufactured by Grundfos are subject to the warranty provided by the manu-

facturer of said products and not by Grundfos' warranty. Grundfos will not be liable

for damage or wear to products caused by abnormal operating conditions, accident,

abuse, misuse, unauthorized alteration or repair, or if the product was not installed

in accordance with Grundfos' printed installation and operating instructions.

To obtain service under this warranty, the defective product must be returned to the

distributor or dealer of Grundfos' products from which it was purchased together

with proof of purchase and installation date, failure date, and supporting installation

data. Unless otherwise provided, the distributor or dealer will contact Grundfos or

an authorized service station for instructions. Any defective product to be returned

to Grundfos or a service station must be sent freight prepaid; documentation sup-

porting the warranty claim and/or a Return Material Authorization must be included

if so instructed.

GRUNDFOS WILL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUEN-

TIAL DAMAGES, LOSSES, OR EXPENSES ARISING FROM INSTALLATION,

USE, OR ANY OTHER CAUSES. THERE ARE NO EXPRESS OR IMPLIED WAR-

RANTIES, INCLUDING MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE, WHICH EXTEND BEYOND THOSE WARRANTIES DESCRIBED OR

REFERRED TO ABOVE.

Some jurisdictions do not allow the exclusion or limitation of incidental or conse-

quential damages and some jurisdictions do not allow limit actions on how long

implied warranties may last. Therefore, the above limitations or exclusions may not

apply to you. This warranty gives you specific legal rights and you may also have

other rights which vary from jurisdiction to jurisdiction.

CU 301

Installation and operating instructions 4

CONTENTS Page

1. Constant-pressure control 5

1.1 Description 5

1.2 Function 5

1.3 System sizing 7

1.4 SQE and SQE-NE 7

1.5 Positioning the pressure sensor 8

1.6 Precharge pressure setting 8

1.7 Pressure relief valve 8

2. Operating functions 9

2.1 On/Off button 9

2.2 Indication of pump operation 9

2.3 Pressure setting 9

2.4 Button locking 10

3. Alarm functions 10

3.1 Service alarm 10

3.2 Dry-running protection 11

4. Position of LEDs 12

5. CU 301 with R100 13

5.1 Menu OPERATION 15

5.1.1 Pressure setting 15

5.1.2 Operating mode 15

5.1.3 Alarm 15

5.2 Menu STATUS 16

5.2.1 Operating mode 16

5.2.2 Actual pressure 16

5.2.3 Speed 16

5.2.4 Temperature 16

5.2.5 Power input and power consumption 16

5.2.6 Operating hours and number of starts 17

5.3 Menu INSTALLATION 17

5.3.1 Sensor 17

5.3.2 Choice of sensor 17

5.3.3 Maximum pressure setting 17

5.3.4 Automatic restart 18

5.3.5 Dry-running stop 18

5.3.6 Maximum speed 18

5.3.7 Cut-in speed 18

5.3.8 Buttons on the CU 301 19

5.3.9 Indication of pump operation 19

5.3.10 Number 19

6. Print 20

7. Troubleshooting 21

7.1 Service 21

8. Technical data 25

8.1 Electrical connection 26

8.1.1 Mains supply 27

8.1.2 Pump supply 27

8.1.3 Pressure sensor 27

9. Pressure sensor voltage chart 28

10. Disposal 29

Prior to installation, read these installation

and operating instructions. Installation and

operation must comply with local regula-

tions and accepted codes of good prac-

tice.

1. Constant-pressure control

The control unit CU 301 is for use only with Grundfos

SQE pumps incorporating electronic power factor

correction (PFC).

1.1 Description

The system maintains a constant pressure within the

maximum pump performance in spite of a varying

water consumption.

The CU 301 is designed for wall mounting only.

Fig. 1 Example of a system with constant-

pressure control

1.2 Function

The pressure is registered by means of the pressure

sensor, which transmits a 4-20 mA signal to the

CU 301. The CU 301 adjusts the pump performance

accordingly to maintain constant pressure by chang-

ing the pump speed.

Mains borne signalling

The communication between the CU 301 and the

pump is via the power supply cable.

This communication principle is mains borne signal-

ling (or power line communication). Using this princi-

ple means that no additional cables to the pump are

required.

The communication of data is effected via a high-fre-

quency signal transmitted to the power supply cable

and led into the electronics unit by means of signal

coils incorporated in the motor and the CU 301

respectively.

In situations where multiple CU 301 pump power

cables are run parallel in wiring trays or conduit and

less than 10-12 inches 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.

Refer to section 5.3.10 for further instructions.

Fig. 2 Principle of mains borne signalling

TM01 7862 4999

Pos. Description

1 CU 301

2 Diaphragm tank (2 gal.)

3 Pressure sensor

4 SQE pump

TM01 8495 1606

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 Mains supply

8 Communication signals

R 100

CU 301

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 accord-

ingly 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. 3.

Fig. 3 Pressure changes in relation to flow

Note: When the pressure is dropping 1.4 psi/s or

faster, the pump will start immediately.

With a diaphragm tank of 2 gal., the pump will start at

a flow rate of approx. 0.8 gpm.

Note: If a larger tank is used, the flow must be higher

before the pump starts.

Consumption up to 0.8 gpm

The pump will start when the pressure has dropped

to 7 psi below the pressure setting.

The pump will run until the pressure is 7 psi above

the pressure setting.

Flow detection

During pump operation, i.e. when water is con-

sumed, the CU 301 will adjust the pump speed to

maintain a constant pressure. In order to stop the

pump when no water is consumed, the CU 301 per-

forms flow detection every 10 seconds.

The pump speed is reduced and pressure is read.

A pressure drop indicates that water is being con-

sumed and the pump speed is resumed, see fig. 4.

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.

Fig. 4 Flow detection every 10 seconds

during operation

System limits

Even though the CU 301 is controlling the pressure

within ±3 psi, 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 dynamic variations depend on the pipework,

but, typically, they will lie between 7 and 14 psi.

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

the far right of fig. 5.

Fig. 5 Possible pressure variations during

constant-pressure operation

A = Pressure setting

TM01 8545 0400

Pressure

Time

Low flow

High flow

TM01 8546 0400TM01 8634 0500

Pressure

Time

Flow detection

10 s10 s

Controlling

±3 psi

Dynamic

variations

±7 psi

Pressure

Start

-7 psi

Stop

+7 psi

gpm

0.8

low

Flow

1.3 System sizing

To ensure the correct function of the system, it is

important that the pump is of the right type.

During operation, the CU 301 controls the pump

speed within the range from 3,000 rpm to 10,700

rpm, see fig. 6.

It is recommended to follow the guidelines below.

Fig. 6 Pump curves at 3,000 rpm and

10,700 rpm

A: Minimum head at no flow.

B: Maximum head at rated flow.

The following must be fulfilled:

• Minimum head at no flow < static head + system

pressure.

Comment: If this is not fulfilled, the pressure may

exceed the pressure set on the CU 301.

• Maximum head at rated flow > dynamic head +

system pressure.

Comment: If this is not fulfilled, the pressure may

fall below the pressure set on the CU 301.

Maximum head at rated flow and minimum head at

no flow can be found in the following sections.

1.4 SQE and SQE-NE

TM01 8547 0400

H [ft]

Q [gpm]

Pump curve

at 10,700 rpm

Pump curve

at 3,000 rpm

Qrated flow

Pump type

Min. head

at 0 gpm,

3,000 rpm

Max. head

at rated flow,

10,700 rpm

[feet] [feet]

5 SQE-90 12 104

5 SQE-140 18 161

5 SQE-180 24 218

5 SQE-230 31 275

5 SQE-270 37 332

5 SQE-320 43 389

5 SQE-360 49 446

5 SQE-410 55 503

5 SQE-450 61 560

10 SQE-110 12 102

10 SQE-160 17 158

10 SQE-200 23 214

10 SQE-240 29 270

10 SQE-290 34 326

10 SQE-330 40 382

15 SQE-70 10 80

15 SQE-110 4 121

15 SQE-150 19 161

15 SQE-180 24 202

15 SQE-220 29 242

15 SQE-250 33 283

15 SQE-290 38 323

22 SQE-40 5 35

22 SQE-80 9 75

22 SQE-120 14 115

22 SQE-160 18 155

22 SQE-190 23 195

22 SQE-220 27 235

30 SQE-40 5 31

30 SQE-90 11 78

30 SQE-130 16 125

10 SQE-100 NE 10 96

10 SQE-140 NE 15 134

10 SQE-180 NE 20 173

10 SQE-220 NE 25 212

10 SQE-260 NE 30 251

10 SQE-300 NE 34 290

10 SQE-340 NE 39 329

22 SQE-40 NE 35 290

22 SQE-80 NE 39 322

22 SQE-110 NE 42 353

22 SQE-140 NE 46 385

22 SQE-180 NE 50 417

22 SQE-210 NE 54 448

1.5 Positioning the pressure sensor

Pressure losses often cause inconvenience to the

user. The CU 301 keeps the pressure constant in the

place where the pressure sensor is positioned, see

fig. 7.

Fig. 7 Pressure sensor position

In fig. 7, tap 1 is placed close to the pressure sensor.

Therefore, the pressure will be kept nearly constant

at tap 1, as the friction loss is small. At the shower

and tap 2, the friction loss is greater. This, of course,

depends on the piping.

Therefore, it is recommended that the pressure sen-

sor be positioned as close to the places of consump-

tion as possible.

1.6 Precharge pressure setting

The CU 301 is designed to work with a 2 gal. dia-

phragm tank.

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 2 gal.

Use the values in the following table.

Prechange pressure is measured with 0 psi in the

pipeline:

Note: If the precharge pressure is higher than the

pressure setting, the system will have difficulty con-

troling 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 will work but that the pressure fluctuations

might increase.

1.7 Pressure relief valve

In order to provide protection against the possibility

of an overpressurization, a pressure relieve valve

should be installed down stream of the well head.

The setpoint of the pressure relief valve should be at

least 30 psi above the pressure setting, see section

2.3.

If a relief valve is installed, it is recommended that its

discharge be plumbed into an appropriate drainage

point.

TM01 7862 4999

Setting

[psi] Precharge pressure

[psi]

40 28

50 35

60 42

70 49

80 56

90 63

100 70

Tap 1 Tap 2

Pressure sensor

2. Operating functions

2.1 On/Off button

Fig. 8 On/Off button

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.

Any alarm indication can be reset by pressing the

On/Off button.

If the On/Off button is pressed for more than 5 sec-

onds, the pump is started, irrespective of any active

fault/alarm indications and sensor signals.

When the On/Off button is released, the pump will

stop, if the alarm still exists.

IMPORTANT

Setting this button to the OFF position DOES

NOT remove power from the pump. Before ser-

vicing the pump, remove power at the service

breaker.

2.2 Indication of pump operation

On the graphical illustration on the CU 301 front, the

riser pipe shows running light when the pump is

operating. When the pump is not operating, none of

the indicator lights are on, see fig. 9.

Fig. 9 Indication of pump operation

The indication of pump operation can be changed by

means of the R100.

Possible settings:

• "Running light" during pump operation

(factory setting).

• "Constant light" during pump operation.

2.3 Pressure setting

The two arrow buttons on the CU 301 front are used

for the pressure setting, see fig. 10.

Fig. 10 Pressure setting and indication

TM02 4169 1606

Indication Description

Green indicator light

permanently on The system is operational.

Green indicator light

off

The system is not opera-

tional.

Red indicator light

permanently on

Pump has been stopped by

means of the On/Off button.*

Red indicator light

flashing

The CU 301 is communicat-

ing with the R100.

PSI

100

Green indi-

cator light

Red indica-

tor light

TM02 4170 1606TM02 4171 1606

PSI

100

PSI

100

PSI

100

Indication of pressure setting

The system pressure set is indicated by a yellow

indicator light, which is permanently on.

Setting range: 40-100 psi.

Arrow-up button

When this button is pressed, the system pressure

setting is increased in steps of 10 psi.

Arrow-down button

When this button is pressed, the system pressure

setting is decreased in steps of 10 psi.

2.4 Button locking

The buttons on the CU 301 can be locked/unlocked

by pressing the two arrow buttons simultaneously for

5 seconds or via the R100 remote control.

Note: When the arrow buttons are used for locking,

take care not to inadvertently change the pressure

setting.

Use the following procedure:

1. Set the pressure one step up.

2. Press the arrow-down button as the first one

when pressing the two buttons.

Fig. 11 Button lock indication

When the buttons are locked, the indicator light is

permanently on, see fig. 11.

For further information, see section 5.3.8 Buttons on

the CU 301.

3. Alarm functions

The CU 301 continuously receives operating data

from the pump. The alarm functions indicated on the

CU 301 front are described in the following sections.

3.1 Service alarm

If one or more factory-set alarm values are

exceeded, the indicator light for service alarm is per-

manently on, see fig. 12.

Fig. 12 Service alarm indicator

Possible alarms:

• Sensor defective

• Overload

• Overtemperature

• Speed reduction

• Voltage alarm

• No contact to pump.

The possible alarms and how to identify them and

make the relevant corrections are described in sec-

tion 7.1 Service.

TM02 4172 1606

PSI

100

TM02 4173 1606

PSI

100

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