Grundfos LC 231 Installation And Operating Instructions Manual

LC 231

Single pump unit

Installation and operating instructions

LC 231 single pump unit

Installation and operating instructions

Other languages

http://net.grundfos.com/qr/i/99381576

GRUNDFOS INSTRUCTIONS

LC 231
English (GB)
Installation and operating instructions ..................................4
Español (ES)
Instrucciones de instalación y funcionamiento............................30
Русский (RU)
Паспорт, Руководство по монтажу и эксплуатации.......................58
中文 (CN)
安装和使用说明书 ...............................................89
3
Table of contents

English (GB)  Installation and operating instructions
Original installation and operating instructions
Table of contents
General information ............. 5
1 Hazard statements .............. 5
2 Notes ..................... 5
Installing the product ............ 5
1 Location .................... 5
2 Mechanical installation ............ 5
3 Electrical connection ............. 7
Starting up the product ...........10
1 Connecting to Grundfos GO Remote.....10
2 Startup wizard on Grundfos GO Remote ..10
3 Startup wizard on the operating panel ....10
4 How to enable Bluetooth on the operating
panel .....................10
5 How to disable Bluetooth on the
operating panel ................11
6 Configuring the IO terminals using
Grundfos GO Remote ............11
7 Testing the product ..............11
Product introduction ............11
1 Product description ..............11
2 Intended use .................11
3 Features....................11
4 Application types ...............12
5 Terminals ...................13
6 Identification..................13
7 Supported communication interface
modules and protocols ............14
Control functions ..............14
1 Operating panel ................14
Setting the product .............15
1 Setting the application type with Grundfos
GO Remote ..................15
2 Setting the sensor type ............15
3 Setting the start level .............15
4 Setting the stop level .............16
5 Setting the high level .............16
6 Stop delay...................16
7 Power-on delay ................16
8 Dry-running protection ............17
9 Using the same level switch for the start
and stop level .................17
10 "Antiseizing"..................17
11 Signal-detection time .............17
12 Setting the maximum number of restarts
with Grundfos GO Remote ..........17
13 Setting the service interval with Grundfos
GO Remote ..................17
14 Operating the product.............18
15 Motor protection................18
16 Alarm reset ..................21
17 Setting the buzzer with Grundfos GO
Remote ....................21
18 Setting units for Grundfos GO Remote....21
19 Setting units for the operating panel with
Grundfos GO Remote ............21
20 GENIbus ...................22
21 Security ....................22
22 Starting the startup wizard with the
operating panel ................22
Servicing the product ............22
1 Updating the product software ........22
2 Replacing the battery .............22
3 Replacing the CIM module ..........23
Fault finding the product ..........23
1 Overview of alarm and warning codes ....23
2 Code 2 (Power phase missing)........23
3 Code 4 (Too many motor restarts) ......24
4 Code 9 (Power phase sequence wrong) . ..24
5 Code 12 (Service needed) ..........24
6 Code 22 (Moisture in motor of pump) ....24
7 Code 25 (Wrong configuration)........24
8 Code 26 (Contactor shorted) .........24
9 Code 48 (Motor is overloaded) ........24
10 Code 51 (Blocked) ..............25
11 Code 57 (Missing water in the
application) ..................25
12 Code 69 (Winding temperature too high) ..25
13 Code 72 (Internal fault) ............25
14 Code 76 (Internal fault) ............25
15 Code 84 (Memory storage media faulty) . ..25
16 Code 85 (Internal fault) ............26
17 Code 117 (Door opened) ...........26
18 Code 159 (Communication error CIMxxx) ..26
19 Code 163 (Drive unit configuration fault) ..26
20 Code 165 (Signal fault) ............26
21 Code 191 (High water level) .........26
22 Code 205 (Level switch inconsistency) . ..27
23 Code 220 (Contactor wear out)........27
24 Code 229 (Water on floor) ..........27
4
English (GB)

9. Technical data ................27

10. Disposing of the product ..........29

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.

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.

2. Installing the product

2.1 Location

Install the product in a location that meets the

following requirements:

• Place the product in a flood-safe place.

• Make sure that the ambient temperature is within

the limits.

• Install the product as close as possible to the

connected pumps, sensors, and accessories.

• The product must be protected from direct

sunlight.

• The product must be easily accessible.

• Outdoor installation: the product must be

installed in a protective shed or enclosure, class

IP 54.

• Indoor installation:The product must be installed

in a well-ventilated room to ensure cooling of its

components.

2.2 Mechanical installation

2.2.1 Removing the front cover

The front cover must be removed to make any

connections or to install the Communication Interface

Module (CIM).

Use an antistatic service kit when handling

electronic components. This prevents

static electricity from damaging the

components.

Place the front cover above the control unit, if

possible. This way you do not need to remove the flat

cable between the front cover and the control unit.

1. Loosen the screws.

2. Carefully separate the front cover from the back

cover.

Be careful not to damage the cable connecting

the front cover and the back cover.

5

English (GB)

3. Place the front cover above the back cover on

the support brackets.

4. To ensure that the front cover does not tilt, insert

the two bottom screws into the open holes at the

top of the back cover.

TM071494

Related information

2.2.3 Installing the control unit

2.2.4 Installing a communication interface module

2.3.4 Connecting a level sensor

3.6 Configuring the IO terminals using Grundfos GO

Remote

2.2.2 Disconnecting the front cover

If you need to remove the front cover completely, you

must remove the flat cable between the front cover

and the back cover.

Use an antistatic service kit when handling

electronic components. This prevents

static electricity from damaging the

components.

1. Loosen the screws.

2. Carefully separate the front cover from the back

cover.

3. Pull out the flat cable that is connected to the

circuit board. Do not remove the flat cable from

the front cover.

TM071323

2.2.3 Installing the control unit

The product is designed to be mounted on a flat and

vertical surface. The cable glands must face

downwards.

1. Loosen the screws and remove the front cover.

Be careful not to damage the cable between the

front cover and the back cover.

2. Drill holes in the surface.

165 (6.5")

215 (8.5")

255 (10.0")

115 (4.5")

280 (11.0")

TM070121

3. Insert wall plugs, if applicable.

4. Fit the four screws in the mounting holes and

cross-tighten the screws.

The mounting screws must have a

minimum length of 32 mm (Ø 8.2

mm). If the wall is more than 3 mm

uneven, insert rubber blocks between

the surface and the control unit to

even the surface. The box of the

control unit must not be bent.

Related information

2.2.1 Removing the front cover

2.2.4 Installing a communication interface module

You can fit a communication interface module (CIM)

in the control unit to enable communication with

external systems. The module is optional and is not

6

English (GB)

delivered with the product. See the installation and

operating instruction for the module regarding

electrical connections.

Use an antistatic service kit when handling

electronic components. This prevents

static electricity from damaging the

components.

1. Loosen the screws and remove the front cover.

Be careful not to damage the cable between the

front cover and the back cover.

2. Push the module on to the three guide pins and

into the socket. Press the module home, using

your fingers.

TM070130

3. Fit the screw to lock the module.

4. Place the labels supplied with the module on the

back of the front cover.

5. Make the electrical connections to the module as

described in the instructions supplied with the

module.

6. Route the wires for the module through one of

the cable glands.

For modules with LAN or antenna cables, you

must order an additional cable gland M20.

7. Fit the cover and cross-tighten the mounting

screws.

Related information

2.2.1 Removing the front cover

4.7 Supported communication interface modules

and protocols

8.18 Code 159 (Communication error CIMxxx)

2.3 Electrical connection

2.3.1 Cable requirements

WARNING

Electric shock

Death or serious personal injury

‐ The wires from the pump phases must

be rated at 90 °C (194 °F).

‐ The wires from the temperature

sensor, if any, must be rated at 480 V

and 70 °C (158 °F).

For the US market only, use flexible metal

conduits (FMC) only.

The wires from the temperature sensor, if

any, must be shielded.

Cable cross sections

Type of

cable

Stranded with

ferrule

Solid

Cross

section

[mm

2

]

[AWG]

[mm

2

]

[AWG]

Contactor

for the

pump

1.5 - 2.5 16-14 1.5 - 4 16-12

Terminal

block for the

power

supply

2.5 - 10 14-8 2.5 - 16 14-6

2.3.2 Protection of controller and supply cables

The controller and the power cables must be overload

protected. Protection must be done by a pre-fuse:

• Melt type gL and gG

• Auto fuse of type C

See the rated current for this specific product on the

product nameplate.

Related information

9. Technical data

7

English (GB)

2.3.3 Connecting the pump supply and power

supply

DANGER

Electric shock

Death or serious personal injury

‐ If national legislation requires a

Residual-Current Device (RCD) or

equivalent in the electrical installation,

this must be of at least type A, due to

the nature of the constant DC leakage

current.

WARNING

Electric shock

Death or serious personal injury

‐ Switch off the power supply before

making any electrical connections.

Make sure that the power supply

cannot be switched on accidentally.

‐ Remember to indicate where the main

switch is located by placing a label or

similar in the control unit.

‐ Make sure that the voltage between

the phase and neutral does not exceed

250 VAC.

‐ Electrical connections must be carried

out according to wiring diagrams.

The wires from the temperature sensor, if

any, must be shielded.

The residual-current circuit breaker must be marked

like this:

TM072098

Take into account the total leakage current of all the

electrical equipment in the installation.

1. Check that the supply voltage and frequency

correspond to the values stated on the

nameplate.

2. Cut the power supply and pump supply cables as

short as possible.

3. Before switching the power on, check all voltages

with a multimeter and ensure that the voltage

between neutral and each phase does not

exceed 250 VAC.

4. Connect the power cables and pump cables

according to the relevant electrical diagram,

including the cables from the motor temperature

and moisture sensor, if any. Tighten the terminal

screws to the correct torque. See table.

Note that all wires must be secured inside the

cabinet using cable ties. All cable glands must be

mounted and plugged even if they are not in use

to ensure correct IP protection level.

Remember to remove the jumper from the PTC

terminal if you are connecting cables from the

temperature sensor to the PTC terminal.

Terminal block Torque [Nm]

Pump contactor 1.2

Power supply 1.2

TM070570

Connecting a wire to a terminal with spring

clamps

5. Tie the pump phase cable(s) to the protection

cover with cable ties.

Example:

L2 L3L1

L

N PE

N

NN EARTH BA

PE

PTC1

T2 T3T1

M

TM070127

Single-phase connections for one pump

Related information

6.15.4 Setting the motor protection with Grundfos

GO Remote

8.2 Code 2 (Power phase missing)

8.4 Code 9 (Power phase sequence wrong)

8

English (GB)

2.3.4 Connecting a level sensor

You can either connect an analog level sensor, such

as a pressure sensor, or a digital level sensor, such

as a float switch.

1. Loosen the screws and remove the front cover.

Be careful not to damage the cable between the

front cover and the back cover.

2. Lead the wires through one of the cable glands.

3. Depending on the type of wire, take one of the

following actions:

• For a shielded wire, lead it through the cable

clamp.

CIO1

GND

TM070571

• For a not shielded wire, attach it to the

protection cover with a cable tie.

DIO1

GND DIO2

GND DI1 GND DI2

GND

CIO1

GND

CIO2 GND 24V

GND

24V GND

TM070760

4. Depending on the type and function of the

sensor, connect the wires to the following

terminals. When using an analog sensor, level

switches can be used to add redundance or

security by adding an extra dry-run sensor or

high-level sensor or both.

Sensor

type

Sensor

function

Terminals

Analog All levels

CIO1 - GND - 24

V

Digital

Dry-running

level

CIO2 - GND

Stop level DIO1 - GND

Start level,

pump 1

DIO2 - GND

Not in use DI1 - GND

High level DI2 - GND

Related information

2.2.1 Removing the front cover

3.6 Configuring the IO terminals using Grundfos GO

Remote

2.3.5 Connecting an alarm device

You can connect an alarm device, such as a buzzer

or a lamp, to the output relays Alarm 1 and Alarm 2.

The control unit triggers the alarm device when it

detects an alarm or a warning. You can change the

behaviour of the outputs with Grundfos GO Remote

under Relay output 1 and Relay output 2.

Default settings of the terminal blocks

Terminal block

Default function

Alarm 1 All alarms

Alarm 2 High level

1. Loosen the screws and remove the front cover.

Be careful not to damage the cable between the

front cover and the back cover.

2. Lead the wires through one of the cable glands.

9

English (GB)

3. Depending on the type of alarm device, connect

the wires to the relevant terminals. Note that all

wires must be secured inside the cabinet using

cable ties.

• NO (Normally Open) and C (Common)

• NC (Normally Closed) and C (Common).

4. Tie the wires with cable ties.

NC

N

NO

TM070569

3. Starting up the product

3.1 Connecting to Grundfos GO Remote

1. Open Grundfos GO Remote on your device.

Make sure that Bluetooth is enabled.

Your device must be within reach of the product

to establish Bluetooth connection.

2. Press the Bluetooth CONNECT button on

Grundfos GO Remote.

3. Press the connect button on the operating panel.

The blue LED above the connect button is

flashing blue until your device is connected.

Grundfos GO Remote is now loading the data for

the product.

Related information

3.4 How to enable Bluetooth on the operating panel

3.5 How to disable Bluetooth on the operating panel

3.2 Startup wizard on Grundfos GO Remote

The product is designed for Bluetooth communication

with Grundfos GO Remote.

Once you have connected your product to Grundfos

GO Remote, a startup wizard appears. Follow the

instructions to make your settings.

Grundfos GO Remote enables you to set functions

and gives you access to status overviews, technical

product information and current operating

parameters.

3.3 Startup wizard on the operating panel

The first time the control unit is switched on, a startup

wizard will guide you through the basic settings. You

can select the sensor type and sensor levels. For

some products, you can also set the nominal pump

current and number of phases.

If you have an analog sensor, select S-1 and set the

height of the different levels, from dry running to high

level.

If you have a digital sensor, select S-2 and enable or

disable the dry-running level, the start level for pump

2, if available and the high level.

To change settings, use the Up and Down buttons on

the operating panel.

Use the OK button to confirm each setting and

navigate to the next setting.

For filling applications, you must use Grundfos GO

Remote.

Units can only be changed with Grundfos GO

Remote.

Designation Description

S-1 Analog sensor

S-2 Digital sensor

-- A

Nominal current (see the nameplate

of the pump)

1Ph Single-phase

3Ph Three-phase

Related information

6.1 Setting the application type with Grundfos GO

Remote

6.22 Starting the startup wizard with the operating

panel

3.4 How to enable Bluetooth on the

operating panel

If the Bluetooth signal on the operating panel has

been disabled for some reason, you are not able to

connect with Grundfos GO Remote. You must enable

Bluetooth first.

1. Press and hold the connect button on the

operating panel for 15 seconds. Wait for the blue

LED to light up.

2. Press the Bluetooth CONNECT button on

Grundfos GO Remote.

3. Press the connect button on the operating panel.

The blue LED above the connect button is

flashing blue until your device is connected

Grundfos GO Remote is now loading the data for

the product.

10

English (GB)

Related information

3.1 Connecting to Grundfos GO Remote

3.5 How to disable Bluetooth on the

operating panel

In some installation areas it is not allowed to have a

Bluetooth signal enabled during operation. After

installation, the Bluetooth signal must be disabled

manually.

1. Press and hold the connect button on the

operating panel for 15 seconds. Wait for the blue

LED to switch off.

Grundfos GO Remote is not connected to the

product anymore.

Related information

3.1 Connecting to Grundfos GO Remote

3.6 Configuring the IO terminals using

Grundfos GO Remote

The control unit is equipped with configurable input

and output terminals. Using Grundfos GO Remote,

you can configure the terminals for different functions,

depending on the device connected to the terminals.

1. Go to Settings > LC 231 IO terminals.

2. Select the terminal you wish to configure and

follow on-screen instructions.

You can find the names of the

terminals inside the control unit.

Related information

2.2.1 Removing the front cover

2.3.4 Connecting a level sensor

4.5 Terminals

8.7 Code 25 (Wrong configuration)

8.21 Code 191 (High water level)

8.22 Code 205 (Level switch inconsistency)

3.7 Testing the product

When you have made all the electrical installations

and completed the startup wizard, you can test the

system.

For emptying applications:

• Fill the pit with water and check that the pump

starts automatically at the defined level.

• Test the dry-running function by starting the

pump manually and wait while the pit with the

pump is emptied. Check that the control unit

indicates an alarm and stops the pump when the

defined level is reached.

• Test the high-level function by stopping the pump

manually and continue to fill the pit with water.

Check that the control unit indicates an alarm

when the defined level is reached. Set the pump

to Auto and observe that the pump starts and

stops when the stop level has been reached.

For filling applications:

• Start by draining the tank to be filled. When the

tank is empty and the start level is reached, the

pump must start. When the tank is full and the

stop level is reached, the pump must stop.

• Test the high-level function by stopping the pump

manually and continue to fill the tank without the

pump with water. Check that the control unit

indicates an alarm when the defined level is

reached.

• Test the dry-running function by starting the

pump manually and wait while the tank with the

pump is emptied. Check that the control unit

indicates an alarm and stops the pump when the

defined level is reached. If the pump is placed in

a well, this test may not be possible since the

pump cannot empty the well. Alternatively, pull

the dry-run level switch up to simulate a dry-run

situation. The same can be done with a pressure

level sensor.

4. Product introduction

4.1 Product description

The level-control unit switches the pump on and off

according to the liquid level measured by float

switches or a pressure sensor. When the start level is

reached, the pump starts, and when the liquid level

has been lowered to the stop level, the pump is

stopped by the control unit. An alarm is indicated in

case of for example high-water level in the tank or

sensor failure.

Basic settings are configured via the operating panel

and advanced settings are configured with Grundfos

GO Remote. Furthermore, you can read important

operating parameters with Grundfos GO Remote.

4.2 Intended use

The control unit is designed to control one pump.

The product can be configured for two purposes:

emptying a wastewater pit or filling a pit or tank. The

product can be used for network pumping stations,

main pumping stations, commercial buildings and

municipal systems.

If the product is used in an explosive environment,

follow local regulations. If required use additional

equipment.

4.3 Features

The control unit features among others the following

functions:

11

English (GB)

• manual and automatic control of the pump

• Bluetooth pairing with Grundfos GO Remote

• operating indication, such as power on and pump

running

• alarm and warning indication, such as power

phase missing and high-water level

• motor and phase failure protection

• setting of stop delays matching the actual

operating conditions.

4.4 Application types

You can choose between two application types:

• Empty

• Fill

You can set the application type with Grundfos GO

Remote.

Empty

1

2

3

4

5

TM073730

Pos. Description

1 High level

2 Not in use

3 Start level P1: start level for pump 1

4 Stop level

5 Dry-running level

The pump will start to empty the tank or pit

when Start level P1 is reached.

The pump stops when the liquid level is lowered

to Stop level.

If the inflow of liquid exceeds the capacity of the

installed pump, the level in the tank or pit will rise.

Eventually, the High level sensor will register a high

liquid level in the tank or pit. If set, the signal from

the High level sensor can be used to activate an

output relay which can then be used to indicate a

visual or acoustic alarm or send a signal to a SCADA

system.

If the pump is running and the liquid level in the tank

or pit falls below the dry-running level, the dry-running

protection will stop the pump to ensure that it is not

damaged mechanically.

Fill

1

2

3

4

5

TM073733

Designation Description

1 High level

2 Stop level

3 Start level P1: start level for pump 1

4 Not in use

5 Dry-running level

In the filling application, the pump is installed in a tank

or well from where it pumps the liquid. The liquid is

pumped into a second tank where the level sensors

are installed.

The pump will start to fill the second tank when Start

level P1 is reached.

The pump stops when the liquid level reaches Stop

level.

If the pump for some reason does not stop at Stop

level and the liquid level keeps rising, the High

level sensor will eventually register this. If set, the

signal from the High level sensor can be used to

activate a relay output which can then be used to

indicate a visual or acoustic alarm or send a signal to

a SCADA system via a communication interface.

If the pump is running and the liquid level in the tank

falls below the dry-running level, the dry-running

protection will stop the pump to ensure that it is not

damaged.

Related information

6.1 Setting the application type with Grundfos GO

Remote

6.14.1 Automatic operation

12

English (GB)

4.5 Terminals

1 2 3 64 5 7 8

TM070123

Pos. Description

1 Contactor for pump 1

2 Not in use

3 Terminal block for the power supply

4

Terminal block for temperature and

moisture-protection sensor for pump 1

5 Not in use

6 Alarm 1

7 Alarm 2

8 Analog and digital inputs and outputs.

DIO1

GND DIO2 GND

DI1

GND

DI2 GND

CIO1

GND

CIO2 GND

24V GND 24V

GND

1 2

3

4

5

6 7

8

9 10 11 12 13 14 15 16

TM070124

Connect to Grundfos GO Remote to see which

options are available for the input and output

terminals.

Pos. Description

1 Digital input/output 1, configurable

2 GND

3 Digital input/output 2, configurable

4 GND

5 Digital input 1

6 GND

7 Digital input 2

8 GND

9 Configurable input/output 1

10 GND

11 Configurable input/output 2

12 GND

13 Supply voltage, 24 V, max. 250 mA

14 GND

15 Supply voltage, 24 V, max. 250 mA

16 GND

Related information

3.6 Configuring the IO terminals using Grundfos GO

Remote

4.6 Identification

4.6.1 Nameplate

Type

P. N.

Made in Denmark

U

N

P.C.

S.N.

P1

V

hp 1PH

hp 3PH

DK - 8850 Bjerringbro Denmark

IP

Tamb

99350749

ENV

°C

1 2 3 4 5

6

7

8

9

14

13

12

10

11

115

200 230

460

TM072267

Pos.

Description

1 Product name

2 Model

3 Maximum motor power, hp

4 Version number and material number

5 Production code, year and week

13

English (GB)

Pos. Description

6 Serial number

7 Enclosure class according to IEC

8 Enclosure class according to NEMA

9 Factory code

10 Production site

11 Markings and approvals

12

Minimum to maximum ambient

temperature

13 Maximum current

14 Supply voltage

4.6.2 Type key

Example LC 231 2x 1 - 7.5 DOL PI

Pos. 1 2 3 4 5

Pos. Description

1

Type:

• LC 231: wall-mounted version

2 Number of pumps supported

3 Current range of pump [A]

4

Starting method:

• DOL: direct-on-line

5

Panel type:

• PI: Plastic, for indoor use

4.7 Supported communication interface

modules and protocols

The following Grundfos communication interface

modules can be added to the product.

Communication interface

module

Protocol

CIM 050 GENIbus

CIM 150 PROFIBUS DP

CIM 200 Modbus RTU

CIM 260 3G/4G

CIM 270 GRM

Communication interface

module

Protocol

CIM 280

Grundfos iSolution

Cloud (GiC)

CIM 500

Modbus TCP

PROFINET IO

GRM IP

Related information

2.2.4 Installing a communication interface module

5. Control functions

5.1 Operating panel

7

6

8

9

11

10

13

14

15

12

5

43

2

1

TM070191

Pos. Symbol Description

1 Display

2

ft

m

Units

3 High level

4 Not in use

5 Start level

6 Stop level

7 Dry-running level

8

Up/Down buttons:

• Press these buttons to

navigate between

submenus or change

the value settings.

14

English (GB)

Pos. Symbol Description

9

OK button:

• Press this button to

save changed values.

10

Connect button:

• Press this button to

connect the control unit

to Grundfos GO Remote

via Bluetooth.

11

Reset button:

• Press this button during

startup to reset settings

and start over or to reset

an alarm or warning.

12

On

Off

Auto

Operating mode for the

pump:

• On: The pump has

been switched on

manually.

• Off: The pump has

been switched off

manually.

• Auto: The pump is

running automatically

based on settings.

13 Display

The display shows the pump

status.

14

Setpoint

5.00 bar

Operaring mode

Normal

Actual controlled value

4.90 bar

Control mode

Const. pressure

Status Settings Assist

1 2 3

56789

Lock symbol:

If the symbol is lit, the control

unit is locked from making

changes.

15

Alarm and warning symbol:

Red: Alarm

Yellow: Warning

The control unit enables manual setting and

monitoring of the system.

6. Setting the product

Make sure that all settings are entered

according to the pump and system

requirements to avoid malfunction.

6.1 Setting the application type with

Grundfos GO Remote

1. Go to Settings > Level control > Application

type.

2.

Select the type.

•

Empty

• Fill

Related information

3.3 Startup wizard on the operating panel

4.4 Application types

6.2 Setting the sensor type

6.2.1 Setting the sensor type with Grundfos GO

Remote

1. Go to Settings > Level control > Sensor type.

2. Select the type.

• Analog sensors

• Digital sensors

6.2.2 Setting the sensor type with the operating

panel

1. Press and hold OK until S-1 or S-2 starts

flashing.

2. Select the sensor type using the Up and Down

buttons.

• S-1: Analog sensors

• S-2: Digital sensors.

3. Press OK to confirm the setting.

4. Continuously press OK to confirm all other

settings and to exit the setup.

6.3 Setting the start level

6.3.1 Setting the start level with Grundfos GO

Remote

The settings apply to analog sensors. For digital

sensors, the setting is automatically activated.

1. Go to Settings > Level Control > Start level

P1.

2. Set the start level for pump 1.

6.3.2 Setting the start level with the operating

panel

The settings apply to analog sensors. For digital

sensors, the setting is automatically activated.

15

English (GB)

1. Press and hold OK until the display and dry

running start flashing.

2. Continuously press OK until the indicator light for

the start level for pump 1 starts flashing.

TM072127

3. Set the start level for pump 1 by using

the Up and Down buttons.

4. Continuously press OK until the display stops

flashing.

The settings have now been stored.

6.4 Setting the stop level

6.4.1 Setting the stop level with Grundfos GO

Remote

The settings apply to analog sensors. For digital

sensors, the setting is automatically activated.

1. Go to Settings > Level control > Stop level

2. Set the stop level.

If you are using the same level for

start and stop, remember to set a stop

delay. This will prevent the pump from

starting and stopping too frequently.

6.4.2 Setting the stop level with the operating

panel

The settings apply to analog sensors. For digital

sensors, the setting is automatically activated.

1. Press and hold OK until the display starts

flashing.

2. Press OK once.

The current stop level is indicated on the display.

3. Set the stop level using

the Up and Down buttons.

4. Continuously press OK to confirm all other

settings and to exit the setup.

If you are using the same level for the

start and stop level, remember to set

a stop delay. This will prevent the

pump from starting and stopping too

frequently.

6.5 Setting the high level

6.5.1 Setting the high level with Grundfos GO

Remote

For analog sensors:

1. Go to Settings > Level control > High level.

2. Set the high level.

For digital sensors:

1. Go to Settings > LC 231 IO terminals

2. Select which terminal to configure.

6.5.2 Setting the high level with the operating

panel

The settings apply to analog sensors

1. Press and hold OK until the display starts

flashing.

2. Press OK four times. The current high level is

indicated on the display.

3. Set the high level using

the Up and Down button.

For digital sensors, enable or disable the setting.

1. Press OK once to complete the setting.

6.6 Stop delay

The stop delay is the time from when the stop level is

reached until the pump stops. The stop delay

prevents the pump from starting and stopping too

frequently and reduces water hammer in long pipes.

6.6.1 Setting the stop delay with Grundfos GO

Remote

1. Select Settings > Level control > Stop delay >

State

2. Select Stop delay time.

3. Set the Stop delay time.

6.7 Power-on delay

With this function it is possible to delay the startup of

the pump after the power supply has been switched

on. The purpose is to avoid disturbing the main power

network which could happen if several pumps start up

immediately when the power supply is switched on.

6.7.1 Setting the power-on delay with Grundfos

GO Remote

1. Go to Settings > Power-on delay.

2. Set the function to Enabled.

3. Set the time delay.

16

English (GB)

6.8 Dry-running protection

If the pump is running and the liquid level in the tank

or pit becomes lower than the dry-running level, the

dry-running protection will stop the pump to ensure

that it is not damaged.

Dry-running protection is dependent on a feedback

signal from a level sensor installed in the tank or pit.

6.8.1 Setting the dry-running level with Grundfos

GO Remote

1. Go to Settings > Level control > Dry-running

level.

2. Set the dry-running level.

The dry-running level must be set to a

value which ensures that the pump is

not damaged due to dry-running. The

specific level depends on the installed

pump type. See the installation and

operating instructions for the product.

6.8.2 Setting the dry-running level with the

operating panel

1. Press and hold OK until the display starts

flashing.

2. Set the dry-running level using the Up or Down

button.

3. Continuously press OK to confirm all other

settings and to exit the setup.

6.9 Using the same level switch for the start

and stop level

1. Set one digital input to Start pump 1 or Stop. All

other digital inputs must be disabled.

2. Set a stop delay.

This will prevent the pump from starting and

stopping too frequently.

6.10 "Antiseizing"

The Antiseizing function prevents a pump from

choking or seizing up as a result of deposits

buildup. Antiseizing is used in pits that have had no

inlet flow for a long period. The Antiseizing function

ensures that the pump starts as often as set

in Antiseizing > interval. The pump will operate for

the number of seconds indicated by the user.

6.10.1 Setting the "Anti-seizing" function with

Grundfos GO Remote

1. Go to Settings > Anti-seizing.

2. Set the function to Enabled.

3. Set the time interval.

4. Set the operating time.

6.11 Signal-detection time

The signal-detection time is the minimum time a level

has to be active before the control unit initiates an

action, such as starting or stopping a pump.

6.11.1 Setting the signal-detection time with

Grundfos GO Remote

1. Go to Settings > Level control > Signal

detection time.

2. Set the signal-detection time.

6.12 Setting the maximum number of

restarts with Grundfos GO Remote

If the pump is seized up as a result of deposits

buildup, it will be stopped automatically due to

overheating, provided that the motor protection has

been set. When the motor has cooled down, the

control unit will unsuccessfully try to restart the pump

and this scenario will be repeated.

In order to prevent this, it is possible to set a

maximum number of restart attempts within a set

interval.

1. Go to Settings > Max number of restarts.

2. Enable the function.

3. Set the interval within which the allowed number

of restarts are to be counted.

4. Set the maximum number of pump restarts which

are allowed during the set interval.

Related information

6.15.4 Setting the motor protection with Grundfos

GO Remote

6.15.1 Overheat protection

6.15.2 Overload protection

8.3 Code 4 (Too many motor restarts)

6.13 Setting the service interval with

Grundfos GO Remote

You can set a time in Grundfos GO Remote in order

to get a reminder that the pump needs service when

the time comes.

1. Go to Settings > Service > State

2. Select Enable and press OK.

3. Select the pump.

4. Enter the number of hours until next service and

press OK.

17

English (GB)

6.14 Operating the product
6.14.1 Automatic operation
In automatic operating mode, the control unit starts
and stops the pump based on the signals it receives
from the connected level sensors and the
corresponding level settings within the control unit.
Related information
4.4 Application types
6.14.2 Manual operation
6.14.2.1 Starting and stopping the pump manually
with Grundfos GO Remote 
1. Go to Settings > Control, pump 1.
2. Start the pump by selecting On and pressing OK.
3. Stop the pump by selecting Off and pressing OK.
Related information
6.14.2.3 Choosing what the pump must do after
manual start
6.14.2.2 Starting and stopping the pump manually
with the operating panel 
1. To start a pump manually, press and hold
the Pump button until the pump starts.
The On indicator light is lit when the pump is
operating in manual mode.
2. Stop the pump by pressing the Pump button.
The Off indicator light is lit when the pump is
stopped.
Related information
6.14.2.3 Choosing what the pump must do after
manual start
6.14.2.3 Choosing what the pump must do after
manual start
The following can be configured:
• Automatic return
Here you select if the pump must automatically
return to a defined operating mode when the
manual start ends.
• Return to
Here you select whether the pump must return to
automatic operating mode or stop when the
manual start ends and Automatic return has
been enabled.
• Forced start time
Here you set the time period in which the pump
must run in manual operating mode.
1. Go to Settings > Manual start.
2. Select Automatic return and choose one of the
following options:
•
Disabled
• Enabled.
3. Go one step back in the menu and select Return
to.
4. Choose one of the following options:
• Auto
• Off.
5. Go one step back in the menu and select Forced
start time.
6. Set the time period in which the pump must run
in manual operating mode.
Related information
6.14.2.2 Starting and stopping the pump manually
with the operating panel 
6.14.2.1 Starting and stopping the pump manually
with Grundfos GO Remote 
6.15 Motor protection
Make sure that all settings are entered
according to the pump and system
requirements to avoid malfunction.
6.15.1 Overheat protection
The control unit offers thermal protection for the
connected motors. Two types of thermal-protection
sensor can be connected to the control unit: a PTC
sensor (analog) and a thermal switch (digital).
Under normal running conditions, the sensor will act
as a short circuit, but when its temperature limit is
reached, it will open and tell the control unit that the
temperature is too high, and the pump is stopped.
When the temperature has dropped to the sensor-
trigger level, the pump will return to normal running
conditions. It will not be possible to start the pump
manually as long as the temperature is too high.
Related information
6.12 Setting the maximum number of restarts with
Grundfos GO Remote
6.15.4 Setting the motor protection with Grundfos
GO Remote 
8.12 Code 69 (Winding temperature too high)
6.15.2 Overload protection
The pump is protected by internal software-based
motor-protection.
18
English (GB)

Related information

6.12 Setting the maximum number of restarts with

Grundfos GO Remote

6.15.4 Setting the motor protection with Grundfos

GO Remote

8.9 Code 48 (Motor is overloaded)

6.15.3 Moisture protection

When a moisture sensor is installed in series with the

temperature sensor, the control unit needs to know

how to determine whether there is a high temperature

or moisture in the pump. If the temperature is too

high, normally the temperature sensor will go back to

its normal stage when the temperature has dropped

to its trigger level. If there is moisture in the pump,

then the moisture sensor will keep the series

connection open until the pump is opened and

serviced.

To determine which sensor has been active, a cool

down time must be entered. This is the time that will

normally pass until the temperature has dropped

enough for the temperature sensor to return to its

normal stage. If the cool down time is exceeded, the

control unit will assume that there is moisture in the

pump, and it will send a moisture alarm.

Related information

6.15.4 Setting the motor protection with Grundfos

GO Remote

6.15.4 Setting the motor protection with Grundfos

GO Remote

You can set the current, temperature and moisture

protection via a setup wizard.

1. Go to Settings > Motor protection pump 1.

2. Follow the on-screen wizard to set the following:

• Nominal pump current

• Trip IEC class

• Pump connection

• Overheat protection.

Related information

2.3.3 Connecting the pump supply and power

supply

6.12 Setting the maximum number of restarts with

Grundfos GO Remote

6.15.1 Overheat protection

6.15.2 Overload protection

6.15.3 Moisture protection

6.15.5 Trip class

8.10 Code 51 (Blocked)

8.23 Code 220 (Contactor wear out)

6.15.5 Trip class

The trip delay indicates the maximum period of time

during which the overload condition is allowed to exist

within a period of 0.1 - 30 seconds.

3

4

1

2

Y

X

TM072271

Curves for trip class "P

Pos. Description

Y Current

X Time

1 Rated motor current

2 10-second trip delay

3 Curve with tripping

4 Curve without tripping

A pump is to cut out after 10 seconds because the

rated current has been exceeded.

1. Select trip class.

2. Set the overload limit to 10 A. The rated motor

current is stated on the nameplate.

See position 3, curve with tripping. LC 231 cuts out

the pump because the pump startup time exceeds 10

seconds and the current exceeds 10 A.

See position 4, curve without tripping. During pump

startup the starting current only briefly exceeds 10 A

and the pump is not cut out.

19

English (GB)

Note that the curves are examples and cannot be

used for readings.

IEC trip curves

0.0

1

5

1010

50

100100

500

10001000

5000

10000

2

3

4

1

A

170

1.0 2.0 3.0

4.0 5.0 6.0 7.0 8.0

9.0

2.25

X

Y

TM072668

Pos. Description

Y Time [s]

X

x I

rated

A Class "p"

1 Class 30

1 Class 20

3 Class 10

4 Class 5

Example:

1. Set the IEC trip class to class 20.

2. Set the overload limit to 10 A. The rated motor

current is stated on the nameplate.

At a motor current of 22.5 A (10 x 2.25), a pump is to

cut out after approx. 170 seconds. In addition to IEC

trip curves, a fixed 4 x I

rated

in 2 seconds is

implemented to protect especially small motors from

overheating (see grey area on drawing).

Contactor Current Protection (CCP)

In addition to the IEC trip class, a Contactor Current

Protection (CCP) trip class is implemented to protect

the internal contactors in the product from

overheating.

10000

1000

100

10

1

0.1 10 20 30 40 50 60 70 80

Y

5

4

3

2

6

X

1

TM072272

Pos.

Description

Y Trip time [s]

X Current [A]

1 CCP

2 Class 30

3 Class 20

4 Class 10

5 Class 5

6 CCP + Class 20

Full-load current is set to 10 [A] and trip class 20 is

selected.

• Motor overload. When the motor is overloaded

with 15 [A], it will take ~800 seconds to trip the

motor protection when trip class 20 is selected.

• The pump is blocked. If the pump is blocked and

the motor has a locked-rotor current specified to

65 [A], it will take approximately 1 second to trip

the motor protection due to the contactor-current

protection.

The contactor is worn out

LC 231 has a wear-out counter for the contactor(s)

which are based on the actual current when the motor

is switched off by the protection function.

When 90 % of the estimated wear-out for the

contactor is reached, the warning code 220 appears

on the operating panel. In Grundfos GO Remote, the

warning Contactor wear out appears.

When 100 % of the estimated wear-out for the

contactor is reached, the alarm code 220 Contactor

wear out appears on the operating panel and the

controller will not be able to start the pumps.

The pump is blocked

To prevent that the contactor gets worn out too fast if

the pump is blocked, a maximum number of restarts

are allowed by the controller. Maximum number of

blocked motor restart can be set from 1 to 3 via

20

English (GB)

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Grundfos LC 231 Installation And Operating Instructions Manual

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